Categories:

Serotonin Reuptake ENHANCER as Anti-Depressant

Also see:
Anti-Serotonin, Pro-Libido
Estrogen, Serotonin, and Aggression
Estrogen, Glutamate, & Free Fatty Acids
Estrogen Increases Serotonin
Omega -3 “Deficiency” Decreases Serotonin Producing Enzyme
Linoleic Acid and Serotonin’s Role in Migraine
Gelatin > Whey
Thyroid peroxidase activity is inhibited by amino acids
Whey, Tryptophan, & Serotonin
Tryptophan, Fatigue, Training, and Performance
Carbohydrate Lowers Free Tryptophan
Protective Glycine
Intestinal Serotonin and Bone Loss
Hypothyroidism and Serotonin
Gelatin, Glycine, and Metabolism
Whey, Tryptophan, & Serotonin
Tryptophan, Sleep, and Depression
Is serotonin an upper or a downer? The evolution of the serotonergic system and its role in depression and the antidepressant response.

The predominant theory of depression suggests that a deficiency of serotonin (the “feel good neurotransmitter” or “happy chemical”) is a major player in depression. However, a more unified & integrated approach sees serotonin as prime facilitator of stress and degeneration that synergizes with other stress substances like estrogen, polyunsaturated fats, excitatory amino acids, prolactin, and glucocorticoids to create vicious, stress stimulating loops.

The proven anti-depression effects of tianapetine (Stablon, Coaxil, Tatinol), a selective serotonin reuptake enhancer (SSRE), calls into question the current model of depression since it has the opposite effect of the selective serotonin reuptake inhibitors (SSRI) drugs commonly used to treat depressives. Instead of inhibiting the uptake of serotonin like an SSRI, an SSRE increases uptake of serotonin, lowering serotonin’s activity. Tianeptine is well tolerated, decreases the excitatory effects of glutatmate, prevents or reverse stress-related brain changes, doesn’t cause dependence or withdrawal symptoms, improves memory, and does not impair cognitive function.

SSRI drugs can sometimes cause very adverse side effects including increased symptoms of depression and suicide, as the Boston Globe article “Prozac Revisited” discusses. Making a Killing: The Untold Story of Psychotropic Drugging is a documentary that reveals how the current model for treating depression needs modification.

Tianeptine is referred to as an “atypical” anti-depression treatment. With a different perspective on physiology and the stress response, it’s the SSRI treatments that are atypical. Hopefully, the efficacy of tianeptine will open the mainstream’s consciousness to the stress-promoting effects of serotonin. This new consciousness can lead to a better understanding of other stress-related health problems.

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Drugs. 1995 Mar;49(3):411-39.
Tianeptine. A review of its pharmacodynamic and pharmacokinetic properties, and therapeutic efficacy in depression and coexisting anxiety and depression.
Wilde MI, Benfield P.
Tianeptine is a novel antidepressant agent, both structurally (modified tricyclic) and in terms of its pharmacodynamic profile. Unlike other antidepressant agents, tianeptine stimulates the uptake of serotonin (5-hydroxytryptamine; 5-HT) in rat brain synaptosomes and rat and human platelets, increases 5-hydroxyindoleacetic acid (5-HIAA) levels in cerebral tissue and plasma, and reduces serotonergic-induced behaviour. Tianeptine reduces the hypothalamic-pituitary-adrenal response to stress, antagonises stress-induced behavioural deficits and prevents changes in cerebral morphology. The antidepressant efficacy of tianeptine, as shown in 2 trials of patients with major depression or depressed bipolar disorder with or without melancholia, is greater than that of placebo. In patients with major depression without melancholia or psychotic features, depressed bipolar disorder or dysthymic disorder, the antidepressant efficacy of short term (4 weeks to 3 months) tianeptine therapy appears to be similar to that of amitriptyline, imipramine and fluoxetine and may be superior to that of maprotiline in patients with coexisting depression and anxiety. However, submaximal dosages of amitriptyline and maprotiline were used in these studies. Preliminary evidence suggests that tianeptine may also be effective in patients with endogenous depression. Progressive therapeutic improvements have been observed with up to 1 year of tianeptine treatment, and long term therapy may reduce the rate of relapse or recurrence. Tianeptine is effective in the treatment of depression in elderly and post-alcohol-withdrawal patient subgroups. Tianeptine was more effective in reducing psychic anxiety than placebo in patients with major depression or depressed bipolar disorder with or without melancholia. The overall anxiolytic properties of tianeptine in patients with coexisting depression and anxiety appear to be similar to those of amitriptyline, imipramine and fluoxetine and may be superior to those of maprotiline, although submaximal dosages of amitriptyline and maprotiline were used. Studies of tianeptine in patients with primary anxiety have not been conducted. Tianeptine is well tolerated in the short (3 months) and long (up to 1 year) term. The incidence of dry mouth (38 vs 20%), constipation (19 vs 15%), dizziness/syncope (23 vs 13%), drowsiness (17 vs 10%) and postural hypotension (8 vs 3%) are greater with amitriptyline than with tianeptine. Insomnia and nightmares occur in more tianeptine than amitriptyline recipients (20 vs 7%). The relative lack of sedative, anticholinergic and cardiovascular adverse effects with tianeptine makes it particularly suitable for use in the elderly and in patients following alcohol withdrawal; these patients are known to have increased sensitivity to the adverse effects associated with psychotropic drugs.(ABSTRACT TRUNCATED AT 400 WORDS)

Encephale 1994 Sep-Oct;20(5):521-5.
[Can a serotonin uptake agonist be an authentic antidepressant? Results of a multicenter, multinational therapeutic trial].
Kamoun A, Delalleau B, Ozun M
The classical biochemical hypothesis of depression posits a functional deficit in central neurotransmitter systems particularly serotonin (5-HT) and noradrenaline. The major role suggested for 5-HT in this theory led to the development of a large number of compounds which selectively inhibit 5-HT uptake. Numerous clinical trials have demonstrated the antidepressant efficacy of such types of serotoninergic agents, supporting 5-HT deficit as the main origin of depression. Therefore, everything seemed clear: depression was caused by 5-HT deficit. Tianeptine is clearly active in classical animal models predictive of antidepressant activity, and is also active in behavioral screening tests: it antagonizes isolation induced aggression in mice and behavioral despair in rats. Biochemical studies have revealed that in contrast to classical tricyclic antidepressant, tianeptine stimulates 5-HT uptake in vivo in the rat brain. This somewhat surprising property was observed in the cortex and the hippocampus following both acute and chronic administrations. This increase in 5-HT uptake has also been confirmed in rat platelets after acute and chronic administrations. Moreover, in humans, a study in depressed patients demonstrated that tianeptine significantly increased platelet 5-HT uptake after a single administration as well as after 10 and 28 days of treatment. The antidepressant activity of tianeptine has been evaluated in controlled studies versus reference antidepressants. Another study aiming to compare the antidepressant efficacy of tianeptine versus placebo and versus imiporamine is presented. 186 depressed patients were included in this trial. They presented with either Major Depression, single episode (24.6%) or Major Depression recurrent (66.8%) or Bipolar Disorder (depressed) (8.6%).

CNS Drugs. 2008;22(1):15-26.
Neurobiological and clinical effects of the antidepressant tianeptine.
Kasper S, McEwen BS.
The precise neurobiological processes involved in depression are not clear, but it is recognized that numerous factors are involved, including changes in neurotransmitter systems and brain plasticity. Neuroplasticity refers to the ability of the brain to adapt functionally and structurally to stimuli. Impairment of neuroplasticity in the hippocampus, amygdala and cortex is hypothesized to be the mechanism by which cognitive function, learning, memory and emotions are altered in depression. The mechanisms underlying alterations in neuroplasticity are believed to relate to changes in neurotransmitters, hormones and growth factors. Structural changes in the hippocampus that have been proposed to be associated with depression include dendritic atrophy, reduced levels of cerebral metabolites, decreased adult neurogenesis (generation of new nerve cells) and reduced volume. Increased dendritic branching occurs in the basolateral nucleus of the amygdala. Reduced neuronal size and glial cell density occur in the prefrontal cortex. Clinically, tianeptine is an antidepressant effective in reducing symptoms of depression in mild to moderate-to-severe major depression, including over the long term. Tianeptine is also effective in alleviating the symptoms of depression-associated anxiety. It is generally well tolerated, with little sedation or cognitive impairment. The efficacy profile of tianeptine could be explained by its neurobiological properties observed in animal models. Tianeptine prevents or reverses stress-associated structural and cellular changes in the brain and normalizes disrupted glutamatergic neurotransmission. In particular, in the hippocampus, it prevents stress-induced dendritic atrophy, improves neurogenesis, reduces apoptosis and normalizes metabolite levels and hippocampal volume. Tianeptine also has beneficial effects in the amygdala and cortex and can reverse the effects of stress on neuronal and synaptic functioning. The neurobiological properties of tianeptine may provide an explanation not only for its antidepressant activity, but also for its anxiolytic effects in depressed patients and its lack of adverse effects on cognitive function and memory.

Neuropsychopharmacol Hung. 2008 Dec;10(5):305-13.
[“Atypical” antidepressive mechanisms: glutamatergic modulation and neuroplasticity in case of tianeptine].
[Article in Hungarian]
András S.
Recent neurobiological and clinical studies demonstrated that neuroplasticity, a principal mechanism of neuronal adaptation and survival, was disrupted in major depression and in long-term stress. Increasing research data show, that structural remodeling and maladaptive dysfunction of certain brain regions is a main component of major depressive illness. Tianeptine, an “atypical” antidepressant, which has a pharmacological action different from the “typical” reuptake blocking agents, underlined a re-evaluation of the neurobiological basis of major depression and revealed that the disorder cannot be explained only by the classic monoamine hypothesis. Neuroplasticity hypothesis of major depression brings the possibility to make important contributions to the diagnosis, however, it may helpful in the understanding the detailed subtle drug effects, which cannot be revealed by pure neurochemical mechanisms. In this review, effects of tianeptine on neuroplasticity, neuroprotection, neurogenesis, hippocampal stress response, long term potentiation, and, as well as on the glutamatergic system and other neuronal networks are evaluated.

Eur Psychiatry. 2002 Jul;17 Suppl 3:318-30.
Structural plasticity and tianeptine: cellular and molecular targets.
McEwen BS, Magarinos AM, Reagan LP.
The hippocampal formation, a structure involved in declarative, spatial and contextual memory, undergoes atrophy in depressive illness along with impairment in cognitive function. Animal model studies have shown that the hippocampus is a particularly sensitive and vulnerable brain region that responds to stress and stress hormones. Studies on models of stress and glucocorticoid actions reveal that the hippocampus shows a considerable degree of structural plasticity in the adult brain. Stress suppresses neurogenesis of dentate gyrus granule neurons, and repeated stress causes remodeling of dendrites in the CA3 region, a region that is particularly important in memory processing. Both forms of structural remodeling of the hippocampus are mediated by adrenal steroids working in concert with excitatory amino acids (EAA) and N-methyl-D-aspartate (NMDA) receptors. EAA and NMDA receptors are also involved in neuronal death that is caused in pyramidal neurons by seizures, head trauma, and ischemia, and alterations of calcium homeostasis that accompany age-related cognitive impairment. Tianeptine (tianeptine) is an effective antidepressant that prevents and even reverses the actions of stress and glucocorticoids on dendritic remodeling in an animal model of chronic stress. Multiple neurotransmitter systems contribute to dendritic remodeling, including EAA, serotonin, and gamma-aminobutyric acid (GABA), working synergistically with glucocorticoids. This review summarizes findings on neurochemical targets of adrenal steroid actions that may explain their role in the remodeling process. In studying these actions, we hope to better understand the molecular and cellular targets of action of tianeptine in relation to its role in influencing structural plasticity of the hippocampus.

Mol Psychiatry. 2005 Jun;10(6):525-37.
Neurobiology of mood, anxiety, and emotions as revealed by studies of a unique antidepressant: tianeptine.
McEwen BS, Olié JP.
Recent studies have provided evidence that structural remodeling of certain brain regions is a feature of depressive illness, and the postulated underlying mechanisms contribute to the idea that there is more to antidepressant actions that can be explained exclusively by a monoaminergic hypothesis. This review summarizes recent neurobiological studies on the antidepressant, tianeptine (S-1574, [3-chloro-6-methyl-5,5-dioxo-6,11-dihydro-(c,f)-dibenzo-(1,2-thiazepine)-11-yl) amino]-7 heptanoic acid, sodium salt), a compound with structural similarities to the tricyclic antidepressant agents, the efficacy and good tolerance of which have been clearly established. These studies have revealed that the neurobiological properties of tianeptine involve the dynamic interplay between numerous neurotransmitter systems, as well as a critical role of structural and functional plasticity in the brain regions that permit the full expression of emotional learning. Although the story is far from complete, the schema underlying the effect of tianeptine on central plasticity is the most thoroughly studied of any antidepressants. Effects of tianeptine on neuronal excitability, neuroprotection, anxiety, and memory have also been found. Together with clinical data on the efficacy of tianeptine as an antidepressant, these actions offer insights into how compounds like tianeptine may be useful in the treatment of neurobiological features of depressive disorders.

J Psychopharmacol. 2004 Dec;18(4):553-8.
The effects of tianeptine or paroxetine on 35% CO2 provoked panic in panic disorder.
Schruers K, Griez E.
Antidepressants that inhibit the reuptake of serotonin (5-HT) are particularly effective in the treatment of panic disorder. Evidence suggests that increased 5-HT availability is important for the anti-panic effect of serotonergic drugs and in maintaining the response to selective serotonin reuptake inhibitors (SSRIs). Tianeptine is an antidepressant with 5-HT reuptake enhancing properties (i.e. the opposite pharmacological profile to that of SSRIs). Therefore, no effect would be expected in panic disorder. The aim of the present study was to compare the effect of tianeptine with that of paroxetine, a selective 5-HT reuptake inhibitor with demonstrated efficacy in panic disorder, on the vulnerability to a laboratory panic challenge in panic disorder patients. Twenty panic disorder patients were treated with either tianeptine or paroxetine for a period of 6 weeks, in a randomized, double-blind, separate group design. The reaction to a 35% CO(2) panic challenge was assessed at baseline and after treatment. Improvement on several clinical scales was also monitored. Tianeptine, as well as paroxetine, showed a significant reduction in vulnerability to the 35% CO(2) panic challenge. In spite of their opposite influence on 5-HT uptake, both tianeptine and paroxetine appeared to reduce the reaction to the panic challenge. These results raise questions about the necessity of 5-HT uptake for the therapeutic efficacy of anti-panic drugs.

Neuropsychobiology. 1997;35(1):24-9.
Placebo-controlled study of tianeptine in major depressive episodes.
Costa e Silva JA, Ruschel SI, Caetano D, Rocha FL, da Silva Lippi JR, Arruda S, Ozun M.
The efficacy and safety of tianeptine were compared, in the course of a multicentre randomised, double-blind, parallel group study, to those of placebo in the treatment of Major Depressions and Bipolar Disorder, Depressed with or without melancholia, without psychotic features. After a 1-week run-in placebo period, 126 depressed out-patients presenting DSM-III-R Major Depression or Bipolar Disorder, Depressed, with a total MADRS score of at least 25, were treated for 42 days with either tianeptine (25-50 mg/day) or placebo. Efficacy assessments were MADRS, CGI, HARS, Zung Depression Self Rating Scale and a VAS. Better efficacy of tianeptine was shown, and confirmed by covariance analyses, in final MADRS scores of the intention-to-treat population, of patients treated for at least 14 days and of completers; also in CGI items 1 and 2, MADRS item 10, and VAS. The results confirmed the efficacy of tianeptine (mean dosage: 37.5 mg/day) in the treatment of Major Depression and Bipolar Disorder, Depressed, with or without melancholia, compared to placebo. Tianeptine’s acceptability did not differ from that of placebo. For adverse events, a higher incidence of headaches was found with tianeptine.

Presse Med. 1996 Mar 16;25(9):461-8.
[Major depressive episodes in patients over 70 years of age. Evaluation of the efficiency and acceptability of tianeptine and mianserin].
[Article in French]
Brion S, Audrain S, de Bodinat C.
OBJECTIVES:
The aim of this multicenter study was to compare the efficacy, acceptability and impact on quality of life of tianeptine (T) and mianserine (M) in patients over 70 years of age with major depression.
METHODS:
Fulfilment of the DSM IIIR criteria for major depression with a total Montgomery and Asberg depression rating scale (MADRS) of at least 25 and a Hamilton anxiety rating scale (HARS) of at least 18 were required for inclusion. The 315 men and women enrolled in the study were given, by double blind assignment, either T: 37.5 mg/day, T: 25 mg/day or M: 30 mg/day. Treatment duration was 6 months in all three groups and follow-up continued for 3 months after withdrawal of tianeptine or mianserine. The main efficacy criterion was the MADRS score evaluated at each of 6 visits at day 15 (D15) and month 1 (M1), M2, M4, M4.5 and M6. The HARS score was another efficacy criterion. Overall assessment of efficacy and acceptability was done at each visit by the patient and the investigator. Both the patient and the physician estimated global effectiveness on a quality of life scale at M1, M3, M6 and M9.
RESULTS:
In the intention-to-treat population (n = 299), the antidepressant efficacy of tianeptine and mianserine was not significantly different, whether assessed as effect on anxiety or on quality of life. Scores however tended to be better in the T: 37.5 mg group. Acceptability was good as shown by the low number of adverse events in all 3 groups, but at D15, the incidence of impaired vigilance or equilibrium was significantly lower in the T: 25 mg group than in the M: 30 mg group, emphasizing the advantage of tianeptine in decreasing the risk of falling. Physician-assessed tolerance and acceptability was significantly different at M3 (p = 0.014) and at M6 (p = 0.028) in favor of T: 37.5 mg, indicating that though increasing dosage does not improve efficacy, there is no risk of poorer acceptability.
CONCLUSION:
These findings reconfirm the antidepressive efficacy, acceptability and safety of tianeptine. They also confirm the anxiolytic aspect associated with the antidepressive effect of tianeptine without any sedative effect. Tianeptine is particularly well indicated in the treatment of depression in elderly or very elderly subjects.

CNS Drugs. 2002;16(1):65-75.
Efficacy and safety of tianeptine in major depression: evidence from a 3-month controlled clinical trial versus paroxetine.
Waintraub L, Septien L, Azoulay P.
OBJECTIVE:
This study was performed to compare the efficacy and safety of tianeptine and paroxetine in the treatment of major depression. Anxiolytic drug use was systematically reported to provide an indirect evaluation of the anxiolytic activity of both treatments. Zopiclone use was assessed to provide an indirect evaluation of the possible hypnotic activity of both treatments.
DESIGN AND SETTING:
This was a 3-month controlled, randomised, double-blind clinical trial which involved 82 centres in France.
PATIENTS:
277 outpatients who met DSM-IV criteria for major depression.
INTERVENTIONS:
Patients were treated with either tianeptine (12.5mg three times daily) or paroxetine (20mg once daily plus two placebo capsules). The drug dosages could be doubled after 3 weeks if required by the patient’s medical state.
MAIN OUTCOME MEASURES AND RESULTS:
There was a significant decrease in the Montgomery-Asberg Depression Rating Scale score in both groups (from 28.9 at baseline to 11 at endpoint in the tianeptine group, and from 29.6 to 11.6 in the paroxetine group) after 3 months of treatment. No significant difference was evident between the groups. Secondary criteria confirmed the antidepressant efficacy of both medications, with no difference between tianeptine and paroxetine (Hamilton Depression Rating Scale global score at endpoint, Clinical Global Impression final scores, number of responders, delay-to-response, rate of dosage doubling at day 21). The anxiolytic and hypnotic consumption rates decreased in both groups, with no significant difference between the groups. There was no significant difference in clinical safety parameters.
CONCLUSION:
Tianeptine appears to be as effective and as safe as paroxetine for the ambulatory treatment of major depression.

CNS Drugs. 2001;15(3):231-59.
Tianeptine: a review of its use in depressive disorders.
Wagstaff AJ, Ormrod D, Spencer CM.
Tianeptine is an antidepressant agent with a novel neurochemical profile. It increases serotonin (5-hydroxytryptamine; 5-HT) uptake in the brain (in contrast with most antidepressant agents) and reduces stress-induced atrophy of neuronal dendrites. Like the selective serotonin reuptake inhibitors (SSRIs) and in contrast with most tricyclic antidepressant agents, tianeptine does not appear to be associated with adverse cognitive, psychomotor, sleep, cardiovascular or bodyweight effects and has a low propensity for abuse. Tianeptine has a comparatively favourable pharmacokinetic profile. It is not subject to first-pass hepatic metabolism, has high bioavailability and limited distribution, and is rapidly eliminated. While this offers advantages for tianeptine over the tricyclic antidepressant agents in terms of dose titration, treatment changes and potential drug interactions, its rapid elimination makes adherence to dosage schedules more important. Tianeptine differs from most antidepressants in that it is not primarily metabolised by the hepatic cytochrome P450 system, indicating less likelihood of drug-drug interactions; this is of particular interest for elderly patients. Tianeptine, in dosages of 25 to 50 mg/day, has been investigated in patients with major depression, depressed bipolar disorder, dysthymia or adjustment disorder. It has equivalent antidepressant efficacy to several classical antidepressant agents (amitriptyline, clomipramine, imipramine, mianserin) and the SSRIs fluoxetine (in most patients), paroxetine and sertraline. Comparison with maprotiline indicated superior efficacy for tianeptine but dothiepin appeared superior in another study. Extended treatment with tianeptine decreases the incidence of relapse/recurrence of depression. Tianeptine appears to be as effective as fluoxetine, sertraline, amitriptyline, clomipramine and mianserin and more effective than maprotiline in improving associated anxiety in patients with depressive disorders. Depression and anxiety symptoms in alcohol dependant patients also respond well to tianeptine. The adverse effects associated with tianeptine are similar in many respects to those of the SSRIs and minimal in comparison with the tricyclic antidepressants. The most common adverse effects are nausea, constipation, abdominal pain, headache, dizziness and changes in dreaming. Anticholinergic effects occur less often with tianeptine than with tricyclic agents. Hepatoxicity is rare. The dosage should be decreased in elderly patients and those with severe renal failure, but adjustment is not necessary in patients with alcoholism or hepatic impairment, or those undergoing haemodialysis. Conclusions: The antidepressant efficacy and favourable tolerability and pharmacokinetic profiles of tianeptine in patients with depression, including those with associated anxiety, have been proven; the data indicate that it may have additional potential in specific subgroups of depressed patients such as the elderly and those with chronic alcoholism.

J Sex Med. 2006 Sep;3(5):910-7.
Tianeptine can be effective in men with depression and erectile dysfunction.
El-Shafey H, Atteya A, el-Magd SA, Hassanein A, Fathy A, Shamloul R.
INTRODUCTION:
Erectile dysfunction (ED) and depression are highly prevalent medical disorders affecting men of diverse cultures throughout the world. Tianeptine is a new antidepressant drug with less adverse effects on sexual functions.
AIM:
To evaluate the efficacy of tianeptine in the treatment of mild to moderate depression with ED.
METHODS AND MAIN OUTCOME MEASURES:
A randomized, double-blind, placebo-controlled, crossover trial. Subjects were assigned either tianeptine or matching placebo, each for 8 weeks. All patients were followed up on monthly basis where they were asked to complete three assessment questionnaires, namely, Anxiety and Depression Scale, Brief Sexual Inventory, and Quality-of-life and erection questionnaire. All patients were asked a global assessment question. Treatment-responsive subjects were defined as study participants who had scores 1-16 on the Anxiety and depression Scale, showed normal erectile function on the Brief Sexual Inventory, and answered “yes” to the global assessment question.
RESULTS:
Of the 237 consecutive men complaining of ED of >6 months and screened for this study, 110 patients met our inclusive criteria; 42 declined to participate. The remaining 68 patients were randomly assigned to treatment. Significant improvement (P < 0.05) was observed during the active drug phase in all three assessments questionnaires, in comparison with the placebo phase. Forty-eight patients (72.7%) of the subjects during the active drug phase were classified as responders, while 19 (27.9%) of the subjects during placebo phase were classified as responders.
CONCLUSIONS:
Tianeptine could be considered an effective therapy for the treatment of depression and ED. Further large-scale multicentered studies are warranted.

Curr Neuropharmacol. 2008 December; 6(4): 311–321.
Tianeptine: An Antidepressant with Memory-Protective Properties
Phillip R Zoladz, Collin R Park, Carmen Muñoz, Monika Fleshner, and David M Diamond
The development of effective pharmacotherapy for major depression is important because it is such a widespread and debilitating mental disorder. Here, we have reviewed preclinical and clinical studies on tianeptine, an atypical antidepressant which ameliorates the adverse effects of stress on brain and memory. In animal studies, tianeptine has been shown to prevent stress-induced morphological sequelae in the hippocampus and amygdala, as well as to prevent stress from impairing synaptic plasticity in the prefrontal cortex and hippocampus. Tianeptine also has memory-protective characteristics, as it blocks the adverse effects of stress on hippocampus-dependent learning and memory. We have further extended the findings on stress, memory and tianeptine here with two novel observations: 1) stress impairs spatial memory in adrenalectomized (ADX), thereby corticosterone-depleted, rats; and 2) the stress-induced impairment of memory in ADX rats is blocked by tianeptine. These findings are consistent with previous research which indicates that tianeptine produces anti-stress and memory-protective properties without altering the response of the hypothalamic-pituitary-adrenal axis to stress. We conclude with a discussion of findings which indicate that tianeptine accomplishes its anti-stress effects by normalizing stress-induced increases in glutamate in the hippocampus and amygdala. This finding is potentially relevant to recent research which indicates that abnormalities in glutamatergic neurotransmission are involved in the pathogenesis of depression. Ultimately, tianeptine’s prevention of depression-induced sequelae in the brain is likely to be a primary factor in its effectiveness as a pharmacological treatment for depression.

Mol Psychiatry. 2010 Mar;15(3):237-49. Epub 2009 Aug 25.
The neurobiological properties of tianeptine (Stablon): from monoamine hypothesis to glutamatergic modulation.
McEwen BS, Chattarji S, Diamond DM, Jay TM, Reagan LP, Svenningsson P, Fuchs E.
Tianeptine is a clinically used antidepressant that has drawn much attention, because this compound challenges traditional monoaminergic hypotheses of depression. It is now acknowledged that the antidepressant actions of tianeptine, together with its remarkable clinical tolerance, can be attributed to its particular neurobiological properties. The involvement of glutamate in the mechanism of action of the antidepressant tianeptine is consistent with a well-developed preclinical literature demonstrating the key function of glutamate in the mechanism of altered neuroplasticity that underlies the symptoms of depression. This article reviews the latest evidence on tianeptine’s mechanism of action with a focus on the glutamatergic system, which could provide a key pathway for its antidepressant action. Converging lines of evidences demonstrate actions of tianeptine on the glutamatergic system, and therefore offer new insights into how tianeptine may be useful in the treatment of depressive disorders.

Br J Psychiatry Suppl. 1992 Feb;(15):66-71.
Long-term administration of tianeptine in depressed patients after alcohol withdrawal.
Malka R, Lôo H, Ganry H, Souche A, Marey C, Kamoun A.
Alcohol interferes with the central metabolism of the catecholamines and especially with indolamines (5-HT). Thus, the use of an antidepressant such as tianeptine, whose main neurochemical effect is to increase the reuptake of 5-HT, seems to be particularly indicated for the continued treatment of depressed patients after alcohol withdrawal. This study evaluated the therapeutic efficacy and acceptability during long-term administration of tianeptine in depressed patients (major depressive episode or dysthymic disorder) in a multicentre trial, after withdrawal from alcohol abuse or dependence. The results relate to 130 depressed patients, who abstained from alcohol and received treatment for a year. Only one patient dropped-out because of side-effects, and medication was interrupted in 5% of subjects because of alcoholic relapses. Prescribed in the long term, tianeptine did not produce orthostatic hypotension, changes in bodyweight, or alterations in the ECG. All changes found in haematological and biochemical investigations suggested an improvement in patients’ physical state. This, and other studies, indicate that tianeptine appears to have the potential to be a safe antidepressant, which might be particularly useful in those patients who are susceptible to the side-effects of psychotropic drugs.

J Clin Psychopharmacol. 2003 Apr;23(2):155-68.
Clinical and neurobiological effects of tianeptine and paroxetine in major depression.
Nickel T, Sonntag A, Schill J, Zobel AW, Ackl N, Brunnauer A, Murck H, Ising M, Yassouridis A, Steiger A, Zihl J, Holsboer F.
Selective serotonin reuptake inhibitors (SSRIs) are widely used as effective pharmacological agents to treat depressive disorders. In contrast to the SSRIs, which block the presynaptic serotonin (5-HT) transporter and by this route increase the concentration of serotonin in the synaptic cleft, the antidepressant tianeptine enhances the presynaptic neuronal reuptake of 5-HT and thus decreases serotonergic neurotransmission. Both SSRIs and tianeptine are clinically effective; however, their opposite modes of action challenge the prevailing concepts on the need of enhancement of serotonergic neurotransmission. To better understand the differences between these two opposite pharmacological modes of action, we compared the changes induced by tianeptine and paroxetine on psychopathology, the hypothalamic-pituitary-adrenocortical (HPA) system, and cognitive functions in a double-blind, randomized, controlled trial including 44 depressed inpatients over a period of 42 days. Depressive symptomatology significantly improved in all efficacy measures, with no significant differences between tianeptine and paroxetine. There was a trend toward better response to the SSRI among women. Assessment of the HPA system showed marked hyperactivity before the beginning of treatment, which then normalized in most of the patients, without significant differences between the two antidepressants. Cognitive assessments showed no significant differences between the two drugs investigated. The results of the current study suggest that the initial effect, i.e., enhancement or decrease of 5-HT release, is only indirectly responsible for antidepressant efficacy, and they support the notion that downstream adaptations within and between nerve cells are crucial. The normalization of the HPA system as a common mode of action of different antidepressants seems to be of special interest.

Prog Neuropsychopharmacol Biol Psychiatry. 1998 Feb;22(2):319-29.
Tianeptine therapy for depression in the elderly.
Saiz-Ruiz J, Montes JM, Alvarez E, Cervera S, Giner J, Guerrero J, Seva A, Dourdil F, López-Ibor JJ.
1. Depression is frequent in the elderly but difficult both to diagnose and treat due to a number of distinctive features. 2. Tianeptine is a novel antidepressant with a reverse mode of action to that of the selective serotonin reuptake inhibitors yet with proven efficacy and safety. 3. 63 elderly patients (mean age:68.8 years; range:65-80 years) with depressive symptoms (major depression:55.6%; dysthymia:44.4%) were included in a 3-month open multicenter study with tianeptine (25 mg daily). 4. 43 patients (68.2%) completed the study. There were no drop-outs due to side-effects. Total Montgomery and Asberg Depression Rating Scale scores were significantly decreased (p < 0.01) on day 14, with a response rate of 76.7%. 5. Improvements were also observed in anxiety and cognitive performance. Side-effects were seen in only 11.7% of patients, with no changes in laboratory or ancillary safety parameters. Tianeptine is thus effective and well tolerated in this category of patient.

Encephale. 1997 Jan-Feb;23(1):56-64.
[Value of tianeptine in treating major recurrent unipolar depression. Study versus placebo for 16 1/2 months of treatment].
[Article in French]
Daléry J, Dagens-Lafant V, De Bodinat C.
OBJECTIVES:
The aim of this study was to assess the efficacy of tianeptine vs placebo in the long-term treatment of unipolar major recurrent depression.
METHOD:
286 patients who met DSM-III-R criteria for major depression with a Hamilton Depression Rating Scale (HDRS-21 items) score > or = 17, and with a history of at least one previous episode within the last 5 years, were treated in an open trial with tianeptine for 6 weeks. 185 patients who responded to treatment at day 42 (intent-to-treat) were randomly assigned to tianeptine 37.5 mg/day (n = 111), or placebo (n = 74). Among these patients 173 were strict responders to tianeptine (per-protocol-population), as defined in the present study by a 50% reduction in the HDRS score, a global score lower than 15 and confirmation by clinical evaluation. Both groups were comparable except for the severity of the depressive episode (significantly more severe in the tianeptine group (33%) than in the placebo group (18%)) (p = 0.018). Relapses and recurrences were defined by a HDRS score > or = 15, and/or a CGI score > or = 4, the recurrences being confirmed by the clinician. Patients were subsequently evaluated at day 63, and the 3rd, 6th, 9th, 12th, 15th and 18th month.
RESULTS:
Special attention was given to the number of relapses and recurrences, and to the delay of onset (Kaplan Meier Method). Between day 42 and 18th month (intent-to-treat group), the rate of relapses and recurrences was significantly higher in the placebo group (36%), than in the tianeptine group (16%) (p = 0.002). Long term comparison of the rate of patients without recurrence or relapse, also showed a significant difference in favour of tianeptine (p < 0.001). The difference between teh 2 groups increased within time. Secondary analysis of relapses and recurrence in the intent-to-treat group showed a significantly higher rate of relapses for the placebo group (p = 0.002); the rate of patients without recurrences in the long term appeared to be at the limit in the intent-to-treat group (p = 0.067) but significant in the per-protocol-group, in favour of tianeptine (p = 0.36). Furthermore, no difference was observed between the 2 groups, in terms of tolerance. Secondary effects attributed to treatment by investigators were rare and benign in each group.
CONCLUSIONS:
These data support the use of tianeptine in the long term treatment of unipolar major recurrent depression. Relapses and recurrences were 2 to 3 times less frequent with tianeptine as compared to placebo. Furthermore, prolonged treatment with tianeptine appeared to be very well tolerated.

[Fluoxetine is Prozac, an SSRI]
Hum Psychopharmacol. 2002 Aug;17(6):299-303.
Tianeptine and fluoxetine in major depression: a 6-week randomised double-blind study.
Novotny V, Faltus F.
In a 6-week, multicentre, randomised, double-blind controlled study, tianeptine (37.5 mg/day) and fluoxetine (20 mg/day) were compared for efficacy and safety in 178 patients with major depression. No significant difference was shown between the two drugs, either in terms of efficacy (MADRS, CGI, COVI) or in terms of safety, except for the CGI ‘severity of illness’ which was lower at the end point with tianeptine than with fluoxetine. The percentages of responders (as defined by a 50% decrease of the MADRS score from baseline to end point) were 75% with tianeptine and 67% with fluoxetine, showing the efficacy of both drugs. In conclusion, both tianeptine and fluoxetine are effective and well-tolerated treatments for major depression.

BMJ Case Rep. 2012 Oct 9;2012.
Tianeptine in combination with monoamine oxidase inhibitors for major depressive disorder.
Tobe EH.
Major depressive disorder may respond to monotherapy with monoamine oxidase inhibitors (MAOIs) or tianeptine. Literature search showed no reports of MAOIs combined with tianeptine. The method included was clinical case history. A 59-year-old woman had partial improvement of depression with the MAOI tranylcypromine combined with topiramate, trazodone and ziprasidone. The patient had further improvement of depression symptoms after addition of tianeptine. No adverse events were evident. The combination of MAIOs and tianeptine may be effective for refractory major depressive disorder.

Neuropsychobiology. 1992;25(3):140-8.
Clinical safety and efficacy of tianeptine in 1,858 depressed patients treated in general practice.
Guelfi JD, Dulcire C, Le Moine P, Tafani A.
1,927 outpatients were included by 392 general practitioners in an open study in order to evaluate the safety of tianeptine in the ambulatory treatment of depression. The results of 1,858 depressed patients without melancholia and psychotic features, fulfilling DSM III criteria of Major Depressive Episode or Dysthymic Disorder, could be analysed. 1,458 patients completed the 3-month treatment period. The group treated with 37.5 mg/day of tianeptine showed improvement on the Montgomery-Asberg Depression Rating Scale. With regard to the clinical tolerance of tianeptine, somatic complaints were rarely reported and adverse events necessitating premature termination of treatment (4.8% of included patients) were without clinical severity. Cardiovascular, haematologic, hepatic and biochemical safety were verified. No signs of dependence and no specific withdrawal symptoms were found after discontinuation of treatment.

Psychiatr Prax. 2003 May;30(4):221-2.
[Therapy resistant major depression: improvement of symptomatology after combining antidepressants with Tianeptine (Stablon)].
[Article in German]
Niederhofer H.
OBJECTIVES:
In common, depressive disorders are treated with various antidepressants, the number of which is enormously increasing. Nevertheless, in some cases therapy resistance is observed. In these cases, neuroleptics are used as an alternative. Recently, Tianeptin (Stablon) has also been used for the treatment of depressive disorders.
METHOD:
We report a 32-year old “therapy resistant” depressive female. Monotherapy with antidepressants and Tianeptin (Stablon) was ineffective.
RESULTS:
Finally, a combination of antidepressants and Tianeptin (Stablon) was effective and lowered the HAMD-Score significantly.
DISCUSSION:
A combination of antidepressants and Tianeptin (Stablon) seems to be an effective new Option for the treatment of “therapy resistant” major depressions.

Eur Neuropsychopharmacol 1997 Oct;7 Suppl 3:S323-S328.
Prevention of stress-induced morphological and cognitive consequences.
McEwen BS, Conrad CD, Kuroda Y, Frankfurt M, Magarinos AM, McKittrick C.
Atrophy and dysfunction of the human hippocampus is a feature of aging in some individuals, and this dysfunction predicts later dementia. There is reason to believe that adrenal glucocorticoids may contribute to these changes, since the elevations of glucocorticoids in Cushing’s syndrome and during normal aging are associated with atrophy of the entire hippocampal formation in humans and are linked to deficits in short-term verbal memory. We have developed a model of stress-induced atrophy of the hippocampus of rats at the cellular level, and we have been investigating underlying mechanisms in search of agents that will block the atrophy. Repeated restraint stress in rats for 3 weeks causes changes in the hippocampal formation that include suppression of 5-HT1A receptor binding and atrophy of dendrites of CA3 pyramidal neurons, as well as impairment of initial learning of a radial arm maze task. Because serotonin is released by stressors and may play a role in the actions of stress on nerve cells, we investigated the actions of agents that facilitate or inhibit serotonin reuptake. Tianeptine is known to enhance serotonin uptake, and we compared it with fluoxetine, an inhibitor of 5-HT reuptake, as well as with desipramine. Tianeptine treatment (10 mg/kg/day) prevented the stress-induced atrophy of dendrites of CA3 pycamidal neurons, whereas neither fluoxetine (10 mg/kg/day) nor desipramine (10 mg/kg/day) had any effect. Tianeptine treatment also prevented the stress-induced impairment of radial maze learning. Because corticosterone- and stress-induced atrophy of CA3 dendrites is also blocked by phenytoin, an inhibitor of excitatory amino acid release and actions, these results suggest that serotonin released by stress or corticosterone may interact pre- or post-synaptically with glutamate released by stress or corticosterone, and that the final common path may involve interactive effects between serotonin and glutamate receptors on the dendrites of CA3 neurons innervated by mossy fibers from the dentate gyrus. We discuss the implications of these findings for treating cognitive impairments and the risk for dementia in the elderly.

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Unsaturated Fats, Oxidative Stress, and Atherosclerosis

Also see:
Unsaturated Fats and Heart Damage
PUFA, Fish Oil, and Alzheimers
Thyroid Status and Cardiovascular Disease
“Normal” TSH: Marker for Increased Risk of Fatal Coronary Heart Disease
A Cure for Heart Disease
Hypothyroidism and A Shift in Death Patterns
Thyroid Status and Oxidized LDL
Unsaturated Fats and Longevity
PUFA Accumulation & Aging

Arterioscler Thromb Vasc Biol. 1997 Nov;17(11):3236-41.
Prostaglandin F2-like compounds, F2-isoprostanes, are present in increased amounts in human atherosclerotic lesions.
Gniwotta C, Morrow JD, Roberts LJ 2nd, Kühn H.
Oxidative modification of LDL is believed to play a major role in atherogenesis. As major lipid peroxidation products oxygenated linoleic acid derivatives and oxysterols have been described in human atherosclerotic lesions. Here we report that human lesions contain isoprostanes as peroxidation products of arachidonic acid at a level of 27.1 +/- 21.2 pg/mg wet weight (n = 10), which corresponds to 75.9 +/- 59.3 pg/mg dry weight, n contrast, human umbilical veins (n = 10), which were used as nonatherosclerotic control vessels, contain much smaller amounts of isoprostanes (1.4 +/- 0.7 pg/mg wet weight, which corresponds to 11.7 +/- 6.2 pg/mg dry weight), and there are significant differences between the two types of vessels. As major products of linoleic acid oxidation, racemic hydroxy linoleate isomers were detected in the lesional ester lipids. In human lesions, the hydroxy linoleic acid/linoleic acid ratio was about 0.5%, a result indicating that 5 out of 1000 linoleate residues are present as hydroxylated derivatives. In umbilical veins, no hydroxy linoleic acid could be detected. These data show that human atherosclerotic lesions contain increased amounts of hydroxy linoleic acid isomers and isoprostanes when compared with nonatherosclerotic vessel wall and suggest a link between local lipid peroxidation and progression of atherosclerosis. For evaluation of the degree of lipid peroxidation, the determination of the hydroxy linoleic acid/linoleic acid ratio appears to be more suitable than the isoprostane content.

Atherosclerosis. 2003 Mar;167(1):111-20.
Fatty acid oxidation products in human atherosclerotic plaque: an analysis of clinical and histopathological correlates.
Waddington EI, Croft KD, Sienuarine K, Latham B, Puddey IB.
Markers of lipid peroxidative damage have been shown to be elevated in individuals with risk factors for cardiovascular disease, and human atherosclerotic plaque contains products resulting from lipid peroxidation. In particular, the presence of fatty acid oxidation products such as hydroxyeicosatetraenoic acids (HETEs) has previously been suggested as a marker of plaque instability and symptomatic cerebrovascular disease. The aim of the present study was to quantitate the levels of various oxidation products of linoleic acid (HODEs) and arachidonic acid (HETEs), respectively, in human atherosclerotic plaque tissue and assess their level in relation to plaque histopathology, symptoms of cerebrovascular disease and preexisting atherosclerotic risk factors. We also assessed the correlation between the levels of the hydroxy fatty acid compounds and F(2)-isoprostanes, an established marker of in vivo free radical mediated oxidation. Hydroxy fatty acid oxidation products were identified in all histological subtypes of advanced plaque. However, there were no significant differences in levels between the histopathologically classified sub-groups or between patients symptomatic or asymptomatic for cerebrovascular disease. Arachidonic acid oxidation products were significantly higher in those subjects who also had symptomatic peripheral vascular disease. The level of linoleic acid oxidation products was significantly higher in individuals who consumed alcohol on a regular basis. While F(2)-isoprostanes and fatty acid oxidation products were highly correlated (P<0.01), levels of the hydroxy fatty acid compounds were 20-40-fold higher than F(2)-isoprostanes. Chiral analysis of the plaque extracts indicated that all HODEs and HETEs originated primarily from non-enzymatic lipid peroxidation. While our results do not support previous reports that fatty acid oxidation products such as the HETEs are associated with plaque instability and symptomatic cerebrovascular disease, further work is warranted to determine the potential of these compounds as circulating markers for underlying atherosclerotic disease and lipid peroxidative stress.

Anal Biochem. 2001 May 15;292(2):234-44.
Identification and quantitation of unique fatty acid oxidation products in human atherosclerotic plaque using high-performance liquid chromatography.
Waddington E, Sienuarine K, Puddey I, Croft K.
Oxidation of lipoproteins, particularly low-density lipoprotein, is thought to play a major role in the development of atherosclerosis. We set out to identify and quantitate the major fatty acid oxidation products in human atherosclerotic plaque obtained from individuals undergoing carotid endarterectomy. Oxidized lipids were extracted from plaque homogenate under conditions to prevent artifactual oxidation. Identification and quantitation was performed using HPLC and GC-MS. High levels of hydroxyoctadecanoic acids (0.51 +/- 0.17 ng/microg of linoleic acid), 15-hydroxyeicosatetranoic acid (HETE) (0.66 +/- 0.24 ng/microg of arachidonic acid), and 11-HETE (0.84 +/- 0.24 ng/microg of arachidonic acid) were detected in all atherosclerotic plaques (n = 10). Low levels of 9-oxo-octadecanoic acid (oxoODE) (0.04 +/- 0.01 ng/microg of linoleic acid), were present in all samples, while 13-oxoODE (0.01 +/- 0.008 ng/microg of linoleic acid) was present in only 4 of the 10 plaque samples. Of interest was the identification of two previously unidentified compounds in atherosclerotic plaque, 11-oxo-eicosatetranoic acid in 9 of the 10 samples and 5,6-dihydroxyeicosatetranoic acid in 3 samples. Chiral analysis revealed that all the major compounds identified in this study are of a nonenzymatic origin. This study is the first to provide a convenient HPLC method to quantify all the products of both linoleic acid and arachidonic acid oxidation in human atherosclerotic plaque. The quantitation of lipid peroxidation products in plaque may be important given the potential biological activity of these compounds and their possible relationship to plaque pathogenesis and instability.

Free Radic Biol Med. 2006 Dec 1;41(11):1678-83. Epub 2006 Sep 8.
Systemic elevations of free radical oxidation products of arachidonic acid are associated with angiographic evidence of coronary artery disease.
Shishehbor MH, Zhang R, Medina H, Brennan ML, Brennan DM, Ellis SG, Topol EJ, Hazen SL.
Oxidant stress is widely believed to participate in cardiovascular disease pathogenesis. However, progress in defining appropriate systemic antioxidant targeted therapies has been hindered by uncertainty in defining clinically relevant systemic oxidant stress measures. In a case control study, 50 subjects with CAD (>50% stenosis in one or more major coronary vessels) and 54 without CAD (<30% stenosis in all major coronary vessels) were tested. Plasma was isolated and stored under conditions designed to prevent artificial lipid peroxidation. Systemic levels of multiple (n=9) specific fatty acid oxidation products including individual hydroxyoctadecadienoic acids (HODEs), hydroxyeicosatetraenoic acids (HETEs), and F(2)-isoprostanes were simultaneously measured by high-performance liquid chromatography (HPLC) with on-line tandem mass spectrometry, along with traditional risk factors and C-reactive protein (CRP) levels. Of the markers monitored, only 9-HETE and F(2)-isoprostanes, both products of free radical-mediated arachidonic acid oxidation, were significantly elevated in patients with angiographically defined CAD (9-HETE, 8.7 +/- 4 vs 6.8 +/- 4 micromol/mol arachidonate, P = 0.011; and F(2)-isoprostanes, 9.4 +/- 5 vs 6.2 +/- 3 micromol/mol arachidonate, P < 0.001). In multivariable analyses with simultaneous adjustment for Framingham risk score and C-reactive protein, 9-HETE (4th quartile OR = 4.8, 95% CI=1.3 to 17.1; P = 0.016) and F(2)-isoprostanes (4th quartile OR=9.7, 95% CI=2.56 to 36.9; P < 0.001) remained strong and independent predictors of CAD risk. Systemic levels of 9-HETE and F(2)-isoprostanes are independently associated with angiographic evidence of CAD and appear superior to other specific oxidation products of arachidonic and linoleic acids as predictors of the presence of angiographically evident coronary artery disease.

Lancet. 1994 Oct 29;344(8931):1195-6.
Dietary polyunsaturated fatty acids and composition of human aortic plaques.
Felton CV, Crook D, Davies MJ, Oliver MF.
How long-term dietary intake of essential fatty acids affects the fatty-acid content of aortic plaques is not clear. We compared the fatty-acid composition of aortic plaques with that of post-mortem serum and adipose tissue, in which essential fatty-acid content reflects dietary intake. Positive associations were found between serum and plaque omega 6 (r = 0.75) and omega 3 (r = 0.93) polyunsaturated fatty acids, and monounsaturates (r = 0.70), and also between adipose tissue and plaque omega 6 polyunsaturated fatty acids (r = 0.89). No associations were found with saturated fatty acids. These findings imply a direct influence of dietary polyunsaturated fatty acids on aortic plaque formation and suggest that current trends favouring increased intake of polyunsaturated fatty acids should be reconsidered.

========================
Established role of isoprostanes, formed from arachidonic acid, in disease and marker for oxidative stress.

Rev Med Interne. 2000 Mar;21(3):304-7.
[Isoprostanes: new markers of oxidative stress. Fundamental and clinical aspects].
[Article in French]
Cracowski JL, Stanke-Labesque F, Bessard G.
A novel family of prostaglandin F2 isomers, called F2-isoprostanes, produced in large quantities in vivo by a free radical peroxidation of arachidonic acid, has recently been described. The quantification of the two major isoforms (isoprostaglandin F2alpha type-III and VI) in biological fluids and tissues as markers of lipid peroxidation appears to be an important advance in our ability to explore the role of free radicals in the pathogenesis of human disease. In addition, F2-isoporstanes quantification seems promising as intermediate endpoints for clinical studies of antioxidant therapies.

Presse Med. 2000 Mar 25;29(11):604-10.
[Isoprostanes: new markers of oxidative stress in human diseases].
[Article in French]
Cracowski JL, Stanke-Labesque F, Souvignet C, Bessard G.
BACKGROUND:
Most of the traditional methods used to assess oxidative stress in clinical setting are non specific, unreliable or inaccurate. Recently, a novel family of prostaglandin F2 isomers, called F2-isoprostanes, produced in vivo by a free radical peroxidation of arachidonic acid, has been described. These compounds may produce physiological or pathological effects due to their ability to alter smooth muscle and platelet functions. The quantification of the two major isoforms (isoprostaglandin F2 alpha type-III and VI) in biological fluids and tissues as markers of lipid peroxidation appears to be an important advance in our ability to explore the role of free radicals in the pathogenesis of human disease.
CLINICAL DATA:
Urinary excretion of F2-isoprostanes is correlated with age, indicating increased oxidative stress during the normal aging process. High F2-isoprostanes concentration has been described in diseases such as ischemic heart disease, diabetes, Alzheimer’s disease and hepatic cirrhosis. The correlation of F2-isoprostane concentrations and human diseases severity in hepatic cirrhosis, cardiac failure and diabetes suggest that these compounds may be of interest as predictive markers.
PERSPECTIVES:
Preliminary studies suggest the use of F2-isoprostanes as prognosis markers. In addition, F2-isoprostanes quantification offers promising potential as intermediate endpoints for clinical studies of antioxidant therapies.

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California Strength: How to Snatch & Clean

Snatch

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Toxic Plant Estrogens

Also see:
20 Foods High In Estrogen (Phytoestrogens)
Plant Toxins in Response to Stress
Estrogen, Progesterone, and Fertility
Quotes: Thyroid, Estrogen, Menstrual Symptoms, PMS, and Infertility
Hormonal profiles in women with breast cancer
Alcohol Consumption – Estrogen and Progesterone In Women
Estrogen, Endotoxin, and Alcohol-Induced Liver Injury
Soy and Behavior
Baby Formula, Soy, and Immunosuppression
Estrogen Levels Increase with Age
Fat Tissue and Aging – Increased Estrogen
Estrogen Related to Loss of Fat Free Mass with Aging
PUFA Increases Estrogen
PUFA Inhibit Glucuronidation
PUFA Promote Cancer
Maternal PUFA Intake Increases Breast Cancer Risk in Female Offspring

“The phytoestrogens appear to pose a risk to organs besides the breast and uterus, for example the liver, colon, and pancreas, which isn’t surprising, since estrogen is known to be carcinogenic for every tissue. And carcinogenesis, like precancerous changes, mutations, and reduced repair of DNA, is probably just an incidental process in the more general toxic effect of acceleration of aging.” -Ray Peat, PhD

“Twenty-five years ago I reviewed many of the issues of estrogen’s toxicity, and the ubiquity of estrogenic substances, and since then have regularly spoken about it, but I haven’t concentrated much attention on the phytoestrogens, because we can usually just choose foods that are relatively free of them. They are so often associated with other food toxins–antithyroid factors, inhibitors of digestive enzymes, immunosuppressants, etc.–that the avoidance of certain foods is desirable.” -Ray Peat, PhD

“Protein deficiency itself contributes to the harm done by toxins, since the liver’s ability to detoxify them depends on adequate nutrition, especially good protein. In the 1940s, Biskind’s experiments showed that protein deficiency leads to the accumulation of estrogen, because the liver normally inactivates all the estrogen in the blood as it passes through the liver. This applies to phytoestrogens and industrial estrogens as well as to the natural estrogens of the body. At a certain point, the increased estrogen and decreased thyroid and progesterone cause infertility, but before that point is reached, the hyperestrogenism causes a great variety of birth defects. Deformities of the male genitals, and later, testicular cancer in the sons and breast cancer in the daughters, are produced by the combination of toxins and nutritional deficiencies.” -Ray Peat, PhD

Nihon Naibunpi Gakkai Zasshi. 1991 May 20;67(5):622-9.
[The effects on the thyroid gland of soybeans administered experimentally in healthy subjects].
[Article in Japanese]
Ishizuki Y, Hirooka Y, Murata Y, Togashi K.
To elucidate whether soybeans would suppress the thyroid function in healthy adults, we selected 37 subjects who had never had goiters or serum antithyroid antibodies. They were given 30g of soybeans everyday and were divided into 3 groups subject to age and duration of soybean administration. In group 1, 20 subjects were given soybeans for 1 month. Groups 2 and 3 were composed of 7 younger subjects (mean 29 y.o.) and 10 elder subjects (mean 61 y.o.) respectively, and the subjects belonging to these groups received soybeans for 3 months. The Wilcoxon-test and t-test were used in the statistical analyses. In all groups, the various parameters of serum thyroid hormones remained unchanged by taking soybeans, however TSH levels rose significantly although they stayed within normal ranges. The TSH response after TRH stimulation in group 3 revealed a more significant increase than that in group 2, although inorganic iodide levels were lowered during the administration of the soybeans. We have not obtained any significant correlation between serum inorganic iodide and TSH. Hypometabolic symptoms (malaise, constipation, sleepiness) and goiters appeared in half the subjects in groups 2 and 3 after taking soybeans for 3 months, but they disappeared 1 month after the cessation of soybean ingestion. These findings suggested that excessive soybean ingestion for a certain duration might suppress thyroid function and cause goiters in healthy people, especially elderly subjects.

Oncol Rep. 1998 May-Jun;5(3):609-16.
Maternal genistein exposure mimics the effects of estrogen on mammary gland development in female mouse offspring.
Hilakivi-Clarke L, Cho E, Clarke R.
Human and animal data indicate that a high maternal estrogen exposure during pregnancy increases breast cancer risk among daughters. This may reflect an increase in the epithelial structures that are the sites for malignant transformation, i.e., terminal end buds (TEBs), and a reduction in epithelial differentiation in the mammary gland. Some phytoestrogens, such as genistein which is a major component in soy-based foods, and zearalenone, a mycotoxin found in agricultural products, have estrogenic effects on the reproductive system, breast and brain. The present study examined whether in utero exposure to genistein or zearalenone influences mammary gland development. Pregnant mice were injected daily with i) 20 ng estradiol (E2); ii) 20 microg genistein; iii) 2 microg zearalenone; iv) 2 microg tamoxifen (TAM), a partial estrogen receptor agonist; or v) oil-vehicle between days 15 and 20 of gestation. E2, genistein, zearalenone, and tamoxifen all increased the density of TEBs in the mammary glands. Genistein reduced, and zearalenone increased, epithelial differentiation. Zearalenone also increased epithelial density, when compared with the vehicle-controls. None of the treatments had permanent effects on circulating E2 levels. Maternal exposure to E2 accelerated body weight gain, physical maturation (eyelid opening), and puberty onset (vaginal opening) in the female offspring. Genistein and tamoxifen had similar effects on puberty onset than E2. Zearalenone caused persistent cornification of the estrus smears. These findings indicate that maternal exposure to physiological doses of genistein mimics the effects of E2 on the mammary gland and reproductive systems in the offspring. Thus, our results suggest that genistein acts as an estrogen in utero, and may increase the incidence of mammary tumors if given through a pregnant mother. The estrogenic effects of zearalenone on the mammary gland, in contrast, are probably counteracted by the permanent changes in estrus cycling.

J Nutr. 1995 Mar;125(3 Suppl):771S-776S.
Potential adverse effects of phytoestrogens.
Whitten PL, Lewis C, Russell E, Naftolin F.
Evaluation of the potential benefits and risks offered by naturally occurring plant estrogens requires investigation of their potency and sites of action when consumed at natural dietary concentrations. Our investigations have examined the effects of a range of natural dietary concentrations of the most potent plant isoflavonoid, coumestrol, using a rat model and a variety of estrogen-dependent tissues and endpoints. Treatments of immature females demonstrated agonistic action in the reproductive tract, brain, and pituitary at natural dietary concentrations. Experiments designed to test for estrogen antagonism demonstrated that coumestrol did not conform to the picture of a classic antiestrogen. However, coumestrol did suppress estrous cycles in adult females. Developmental actions were examined by neonatal exposure of pups through milk of rat dams fed a coumestrol, control, or commercial soy-based diet during the critical period of the first 10 postnatal days or throughout the 21 days of lactation. The 10-day treatment did not significantly alter adult estrous cyclicity, but the 21-day treatment produced in a persistent estrus state in coumestrol-treated females by 132 days of age. In contrast, the 10-day coumestrol treatments produced significant deficits in the sexual behavior of male offspring. These findings illustrate the broad range of actions of these natural estrogens and the variability in potency across endpoints. This variability argues for the importance of fully characterizing each phytoestrogen in terms of its sites of action, balance of agonistic and antagonistic properties, natural potency, and short-term and long-term effects.

J Clin Endocrinol Metab. 1995 May;80(5):1685-90.
Dietary intervention study to assess estrogenicity of dietary soy among postmenopausal women.
Baird DD, Umbach DM, Lansdell L, Hughes CL, Setchell KD, Weinberg CR, Haney AF, Wilcox AJ, Mclachlan JA.
We tested the hypothesis that postmenopausal women on a soy-supplemented diet show estrogenic responses. Ninety-seven postmenopausal women were randomized to either a group that was provided with soy foods for 4 weeks or a control group that was instructed to eat as usual. Changes in urinary isoflavone concentrations served as a measure of compliance and phytoestrogen dose. Changes in serum FSH, LH, sex hormone binding globulin, and vaginal cytology were measured to assess estrogenic response. The percentage of vaginal superficial cells (indicative of estrogenicity) increased for 19% of those eating the diet compared with 8% of controls (P = 0.06 when tested by ordinal logistic regression). FSH and LH did not decrease significantly with dietary supplementation as hypothesized, nor did sex hormone binding globulin increase. Little change occurred in endogenous estradiol concentration or body weight during the diet. Women with large increases in urinary isoflavone concentrations were not more likely to show estrogenic responses than were women with more modest increases. On the basis of published estimates of phytoestrogen potency, a 4-week, soy-supplemented diet was expected to have estrogenic effects on the liver and pituitary in postmenopausal women, but estrogenic effects were not seen. At most, there was a small estrogenic effect on vaginal cytology.

Proc Soc Exp Biol Med. 1995 Jan;208(1):92-7.
Clinical changes in ovariectomized ewes exposed to phytoestrogens and 17 beta-estradiol implants.
Nwannenna AI, Lundh TJ, Madej A, Fredriksson G, Björnhag G.
Eight Swedish Finewool Landrace ewes, ovariectomized 5 months earlier and kept on nonestrogenic hay, were each fed 3.5 kg red clover silage, corresponding to 6.1 g phytoestrogens (of which 3.5 g was formononetin) per day, for 14 days in November (short days). In January (short days), two groups (3 each) of these ewes received one or two 17 beta-estradiol sc implants. In May (long days), one of two new groups (4 each) of these ewes was reexposed to phytoestrogens for another 14 days while the other served as a control. Physical examination of ewes for changes in reproductive organs was carried out two or three times per week during each feeding/treatment, and continued until observed changes disappeared. Clinically significant changes occurred in the reproductive organs of ewes fed red clover. Vulva color changed from pale to pink and red, and there were enlargements of the vulva, uterus, and udder. In addition, teat length and circumference increased, and secretion of milky fluid began. These changes were similar, but more pronounced during treatment with 17 beta-estradiol, particularly teat circumference. The changes in vulva were more dramatic in May than in November and resembled those observed in ewes treated with estradiol. Our data show that a daily intake of 3.5 g formononetin for 14 days caused the increase of teat size and changes in the color of the vulva and in uterus weight in ovariectomized ewes.

Proc Soc Exp Biol Med. 1995 Jan;208(1):6-12.
Chemical studies of phytoestrogens and related compounds in dietary supplements: flax and chaparral.
Obermeyer WR, Musser SM, Betz JM, Casey RE, Pohland AE, Page SW.
High-performance liquid chromatographic (HPLC) and mass spectrometric (MS) procedures were developed to determine lignans in flaxseed (Linum usitatissimum) and chaparral (Larrea tridentata). Flaxseed contains high levels of phytoestrogens. Chaparral has been associated with acute nonviral toxic hepatitis and contains lignans that are structurally similar to known estrogenic compounds. Both flaxseed and chaparral products have been marketed as dietary supplements. A mild enzyme hydrolysis procedure to prevent the formation of artifacts in the isolation step was used in the determination of secoisolariciresinol in flaxseed products. HPLC with ultraviolet spectral (UV) or MS detection was used as the determinative steps. HPLC procedures with UV detection and mass spectrometry were developed to characterize the phenolic components, including lignans and flavonoids, of chaparral and to direct fractionation studies for the bioassays.

Proc Soc Exp Biol Med. 1995 Jan;208(1):98-102.
The phytoestrogen congeners of alcoholic beverages: current status.
Gavaler JS, Rosenblum ER, Deal SR, Bowie BT.
The idea that alcoholic beverages might contain biologically active phytoestrogenic congeners stemmed from findings of overt feminization observed in alcoholic men with alcohol-induced cirrhosis. Specifically, in addition to being hypogonadal, these chronically alcohol-abusing men with cirrhosis frequently manifest gynecomastia, palmar erythema, spider angiomata, and a female escutcheon. These physical signs of exposure to active estrogen occur in the presence of normal or only minimally elevated levels of endogenous steroid estrogens. Because levels of circulating steroid hormones failed to provide a satisfactory explanation for the feminization observed, alternate explanations were considered. If the estrogenization observed was not entirely a function of tissue expose to steroid estrogens produced endogenously, then perhaps tissues were being exposed to exogenous estrogenic substances from dietary sources. Given the degree of alcohol abuse in the population in which hypotheses for feminization were being formed, alcoholic beverages became a prime candidate as a dietary source of exogenous estrogenic substances.

Steroids. 1994 Jul;59(7):443-9.
Influence of phytoestrogen diets on estradiol action in the rat uterus.
Whitten PL, Russell E, Naftolin F.
The influence of coumestrol on the action of estradiol was examined in oral and parenteral tests. Coumestrol did not antagonize the uterotrophic action of estradiol when administered either prior to, or jointly with, E2 treatment, or when administered orally or parenterally. Additive effects on estradiol stimulation of uterine weight and reduction of cytosolic estrogen receptor binding were observed following oral, but not parenteral, administration of coumestrol. On the other hand, coumestrol pretreatment did appear to dampen estradiol’s induction of progestin receptors, uterine protein, and nuclear estrogen receptor binding. However, even at those endpoints where coumestrol pretreatment did dampen estradiol action, coumestrol itself produced an estrogenic response. These findings contradict the assumption that all phytoestrogens are necessarily antiproliferative agents and argue for specific identification of the actions of each chemical.

The estrogens in clover have been known for several decades to have a contraceptive action in sheep, and other phytoestrogens are known to cause deformities in the genitals, feminization of men, and anatomical changes in the brain as well as functional masculinization of the female brain. -Ray Peat, PhD

J Anim Sci. 1995 May;73(5):1509-15.
Detection of the effects of phytoestrogens on sheep and cattle.
Adams NR.
Cows and ewes fed estrogenic forage may suffer impaired ovarian function, often accompanied by reduced conception rates and increased embryonic loss. Males are relatively unaffected, but the mammary glands in females and castrate males may undergo hypertrophy of the duct epithelium, accompanied by secretion of clear or milky fluid. In cows, clinical signs resemble those associated with cystic ovaries. The infertility is temporary, normally resolving within 1 mo after removal from the estrogenic feed. However, ewes exposed to estrogen for prolonged periods may suffer a second form of infertility that is permanent, caused by developmental actions of estrogen during adult life. The cervix becomes defeminized and loses its ability to store spermatozoa, so conception rates are reduced, although ovarian function remains normal. Importantly, both temporary and permanent infertility in ewes often occur without observable signs and can be detected only by measurement of phytoestrogens in the diet, or measurement of their effects on the animal. Low background concentrations of dietary phytoestrogens are suggested to play an important role in prevention of disease in humans and laboratory rats, but subclinical effects of phytoestrogens in cattle have not yet been described. Effects of low concentrations of phytoestrogens on reproductive function in ruminants are likely to receive increasing attention.

Proc Soc Exp Biol Med. 1995 Jan;208(1):87-91.
Organizational and activational effects of phytoestrogens on the reproductive tract of the ewe.
Adams NR.
Ewes exposed to phytoestrogens may display two forms of infertility, categorized as temporary or permanent. Temporary infertility results from actions of estrogen that are similar to the activational effects of estrogen in most species of mammals. The permanent infertility results from changes to the cervix which are analogous to the organizational effects of estrogen reported in other species treated during organogenesis. However, in the ewe these effects may be produced after organogenesis by prolonged treatment during adult life. It has recently become apparent that the level of nutrition and metabolic hormones influence the degree of uterus-like histological change in the cervix produced by prolonged treatment with estrogen. It is hypothesized that, under some nutritional conditions, the hormonal milieu in adult ewes may simulate hormonal patterns that are normally experienced by fetal lambs in utero, thereby allowing the cervix of the adult ewe to give an organizational response to estrogen.

J Endocrinol. 1981 Jun;89(3):365-70.
Oestrogen receptors and metabolic activity in the genital tract after ovariectomy of ewes with permanent infertility caused by exposure to phytooestrogens.
Tang BY, Adams NR.
Characteristics of the uterus and cervix after ovariectomy of ewes with permanent phytooestrogen infertility (PPI) were compared with controls. Ewes with PPI had more oestrogen-binding sites in the cervix, but not in the uterus. There was no difference between the two groups of ewes in the binding affinity constant of receptors from the uterus or cervix. There were more keratinized cells in the vaginal epithelium of ewes with PPI, and the rates of protein and glycoprotein synthesis in the uterus and cervix were higher in ewes with PPI. These results offer further evidence that PPI in adult ewes is similar to the “persistent oestrus’ syndrome in rodents oestrogenized neonatally.

Acta Vet Scand. 1994;35(2):173-83.
Effects of oestrogenic silage on some clinical and endocrinological parameters in ovariectomized heifers.
Nwannenna AI, Madej A, Lundh TJ, Fredriksson G.
The influence of phytoestrogens was studied in 3 ovariectomized Swedish Friesian heifers fed 20 kg of 100% red clover silage per heifer/day for 14 days. Behaviour, reproductive organs and pituitary response to exogenous gonadotropin-releasing hormone (GnRH) injections were monitored. Clinical effects like oedema and mucous discharge in the vulva, presence of milky fluid in the mammae and increases in teat size and the cross-sectional distance of the uterus were observed in heifers fed red clover silage. Fluid accumulation in the uterus, visualized by means of ultrasonography, had still not disappeared 30 days after the red clover silage had been completely withdrawn. Red clover silage appeared to reduce the magnitude and duration of the pituitary response to GnRH injections.

J Reprod Fertil Suppl. 1981;30:223-30.
A changed responsiveness to oestrogen in ewes with clover disease.
Adams NR.
When clover-infertile ewes are subsequently exposed to non-oestrogenic pasture, they have a reduced fertilization rate, due to an inability to store spermatozoa in the cervix, and the cervical mucus has a reduced spinnbarkeit, caused by a slower response to oestrogenic stimulation. Vaginal cell keratinization and oestrous behaviour occurred more slowly after treatment of affected ewes with oestrogen. Other changes in affected ewes suggest that phyto-oestrogens have permanent mild differentiating effects on adults. Sexual behaviour is masculinized, the cervix takes on a uterine-like appearance and the genital tract becomes permanently oestrogenized. The manner in which these changes relate to the altered responsiveness to oestrogen remains to be clarified.

Ginecol Obstet Mex. 1998 Mar;66:111-8.
[Estrogens of vegetable origin].
[Article in Spanish]
Rubio Lotvin B.
In recent years, estrogens of vegetable origin have acquired some importance that justify the presentation of the available data. The compounds that have estrogenic effect when ingested as food through vegetables include isoflavones, lignines and lactones. The review comprises their chemical structure, metabolism and excretion as well as their effect on plasmatic levels of estrogens FSH, LH and SHBG as well as their activity over lipoproteins and, naturally, their action on menopause symptoms and breast cancer.

J Toxicol Environ Health. 1997 Jan;50(1):1-29.
Biochemical and molecular changes at the cellular level in response to exposure to environmental estrogen-like chemicals.
Roy D, Palangat M, Chen CW, Thomas RD, Colerangle J, Atkinson A, Yan ZJ.
Estrogen-like chemicals are unique compared to nonestrogenic xenobiotics, because in addition to their chemical properties, the estrogenic property of these compounds allows them to act like sex hormones. Whether weak or strong, the estrogenic response of a chemical, if not overcome, will add extra estrogenic burden to the system. At elevated doses, natural estrogens and environmental estrogen-like chemicals are known to produce adverse effects. The source of extra or elevated concentration of estrogen could be either endogenous or exogenous. The potential of exposure for humans and animals to environmental estrogen-like chemicals is high. Only a limited number of estrogen-like compounds, such as diethylstilbestrol (DES), bisphenol A, nonylphenol, polychlorinated biphenyls (PCBs), and dichlorodiphenyltrichloroethane (DDT), have been used to assess the biochemical and molecular changes at the cellular level. Among them, DES is the most extensively studied estrogen-like chemical, and therefore this article is focused mainly on DES-related observations. In addition to estrogenic effects, environmental estrogen-like chemicals produce multiple and multitype genetic and/or nongenetic hits. Exposure of Syrian hamsters to stilbene estrogen (DES) produces several changes in the nuclei of target organ for carcinogenesis (kidney): (1) Products of nuclear redox reactions of DES modify transcription regulating proteins and DNA; (2) transcription is inhibited; (3) tyrosine phosphorylation of nuclear proteins, including RNA polymerase II, p53, and nuclear insulin-like growth factor-1 receptor, is altered; and (4) DNA repair gene DNA polymerase beta transcripts are decreased and mutated. Exposure of Noble rats to DES also produces several changes in the mammary gland: proliferative activity is drastically altered; the cell cycle of mammary epithelial cells is perturbed; telomeric length is attenuated; etc. It appears that some other estrogenic compounds, such as bisphenol A and nonylphenol, may also follow a similar pattern of effects to DES, because we have recently shown that these compounds alter cell cycle kinetics, produce telomeric associations, and produce chromosomal aberrations. Like DES, bisphenol A after metabolic activation is capable of binding to DNA. However, it should be noted that a particular or multitype hit(s) will depend upon the nature of the environmental estrogen-like chemical. The role of individual attack leading to a particular change is not clear at this stage. Consequences of these multitypes of attack on the nuclei of cells could be (1) nuclear toxicity/cell death; (2) repair of all the hits and then acting as normal cells; or (3) sustaining most of the hits and acting as unstable cells. Proliferation of the last type of cell is expected to result in transformed cells.

Environ Health Perspect. 1997 Apr;105 Suppl 3:633-6.
Dietary estrogens stimulate human breast cells to enter the cell cycle.
Dees C, Foster JS, Ahamed S, Wimalasena J.
It has been suggested that dietary estrogens neutralize the effect of synthetic chemicals that mimic the effects of estrogen (i.e., xenoestrogens, environmental estrogens). Genistein, a dietary estrogen, inhibits the growth of breast cancer cells at high doses but additional studies have suggested that at low doses, genistein stimulates proliferation of breast cancer cells. Therefore, if dietary estrogens are estrogenic at low doses, one would predict that they stimulate estrogen-receptor positive breast cancer cells to enter the cell cycle. Genistein and the fungal toxin zearalenone were found to increase the activity of cyclin dependent kinase 2 (Cdk2) and cyclin D1 synthesis and stimulate the hyperphosphorylation of the retinoblastoma susceptibility gene product pRb105 in MCF-7 cells. The steroidal antiestrogen ICI 182,780 suppressed dietary estrogen-mediated activation of Cdk2. Dietary estrogens not only failed to suppress DDT-induced Cdk2 activity, but were found to slightly increase enzyme activity. Both zearalenone and genistein were found to stimulate the expression of a luciferase reporter gene under the control of an estrogen response element in MVLN cells. Our findings are consistent with a conclusion that dietary estrogens at low concentrations do not act as antiestrogens, but act like DDT and estradiol to stimulate human breast cancer cells to enter the cell cycle.

Nutr Cancer. 2006;54(2):184-201.
Phytoestrogen content of foods consumed in Canada, including isoflavones, lignans, and coumestan.
Thompson LU, Boucher BA, Liu Z, Cotterchio M, Kreiger N.
Phytoestrogens may play a role in hormone-related diseases such as cancer, but epidemiological and clinical data are conflicting in part due to inadequate databases used in intake estimation. A database of nine phytoestrogens in foods relevant to Western diets was developed to more accurately estimate intakes. Foods (N = 121) available in Ontario, Canada were prepared as commonly consumed and analyzed for isoflavones (genistein, daidzein, glycitein, formononetin), lignans (secoisolariciresinol, matairesinol, pinoresinol, lariciresinol), and coumestan (coumestrol) using gas chromatography-mass spectrometry methods. Data were presented on an as is (wet) basis per 100 g and per serving. Food groups with decreasing levels of total phytoestrogens per 100 g are nuts and oilseeds, soy products, cereals and breads, legumes, meat products, and other processed foods that may contain soy, vegetables, fruits, alcoholic, and nonalcoholic beverages. Soy products contain the highest amounts of isoflavone, followed by legumes, meat products and other processed foods, cereals and breads, nuts and oilseeds, vegetables, alcoholic beverages, fruits, and nonalcoholic beverages. Decreasing amounts of lignans are found in nuts and oilseeds, cereals and breads, legumes, fruits, vegetables, soy products, processed foods, alcoholic, and nonalcoholic beverages. The richest sources of specific phytoestrogens, including coumestrol, were identified. The database will improve phytoestrogen intake estimation in future epidemiological and clinical studies particularly in Western populations.

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Menopausal Estrogen Therapy Lowers Body Temperature

Also see:
Inflammation from Decrease in Body Temperature
Melatonin Lowers Body Temperature
Temperature and Pulse Basics & Monthly Log
Thyroid, Temperature, Pulse
Ray Peat, PhD on Thyroid, Temperature, Pulse, and TSH

J Appl Physiol. 1997 Aug;83(2):477-84.
Chronic hormone replacement therapy alters thermoregulatory and vasomotor function in postmenopausal women.
Brooks EM, Morgan AL, Pierzga JM, Wladkowski SL, O’Gorman JT, Derr JA, Kenney WL.
This investigation examined effects of chronic (>/=2 yr) hormone replacement therapy (HRT), both estrogen replacement therapy (ERT) and estrogen plus progesterone therapy (E+P), on core temperature and skin blood flow responses of postmenopausal women. Twenty-five postmenopausal women [9 not on HRT (NO), 8 on ERT, 8 on E+P] exercised on a cycle ergometer for 1 h at an ambient temperature of 36 degrees C. Cutaneous vascular conductance (CVC) was monitored by laser-Doppler flowmetry, and forearm vascular conductance (FVC) was measured by using venous occlusion plethysmography. Iontophoresis of bretylium tosylate was performed before exercise to block local vasoconstrictor (VC) activity at one skin site on the forearm. Rectal temperature (Tre) was approximately 0.5 degrees C lower for the ERT group (P < 0.01) compared with E+P and NO groups at rest and throughout exercise. FVC: mean body temperature (Tb) and CVC: Tb curves were shifted approximately 0.5 degrees C leftward for the ERT group (P < 0.0001). Baseline CVC was significantly higher in the ERT group (P < 0.05), but there was no interaction between bretylium treatment and groups once exercise was initiated. These results suggest that 1) chronic ERT likely acts centrally to decrease Tre, 2) ERT lowers the Tre at which heat-loss effector mechanisms are initiated, primarily by actions on active cutaneous vasodilation, and 3) addition of exogenous progestins in HRT effectively blocks these effects.

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Acute Appendicitis and Serotonin

Also see:
Linoleic Acid and Serotonin’s Role in Migraine
Hypothyroidism and Serotonin
Estrogen Increases Serotonin
Tryptophan, Sleep, and Depression
Anti-Serotonin, Pro-Libido
Serotonin and Melatonin Lower Progesterone
Intestinal Serotonin and Bone Loss

Indian J Gastroenterol. 1997 Jan;16(1):18-9.
Evaluation of plasma serotonin concentration in acute appendicitis.
Kalra U, Chitkara N, Dadoo RC, Singh GP, Gulati P, Narula S.
BACKGROUND:
Due to lack of reliable biochemical/radiological markers, the diagnosis of acute appendicitis is based only on clinical features.
METHODS:
We estimated plasma serotonin levels in 48 patients with acute appendicitis (histologically proven), 27 patients with abdominal pain of other etiologies, and 20 healthy controls.
RESULTS:
The plasma serotonin levels were (mean +/- SD) 36.6 +/- 12.5 nmol/L, 12.5 +/- 3.6 nmol/L and 10.4 +/- 3.5 nmol/L in the three groups, respectively. The levels in patients with acute appendicitis were significantly higher (p < 0.001) than in the other groups, giving 93.8% sensitivity and 95.7% specificity to the test.
CONCLUSION:
Plasma serotonin level is a reliable marker of acute appendicitis, especially in the first 48 hours.

APMIS. 2008 Nov;116(11):947-52.
Serotonin content of normal and inflamed appendix: a possible role of serotonin in acute appendicitis.
Vasei M, Zakeri Z, Azarpira N, Hosseini SV, Solaymani-Dodaran M.
The appendix is lined by a mucosa which has many neuroendocrine cells containing serotonin. Local release of serotonin can act as a mediator of inflammation. In this study we explored the serotonin content of the neuroendocrine cells of the appendixes removed for clinical diagnosis of appendicitis. Appendix specimens were divided into three groups: Acute appendicitis (AA), non-appendicitis (NA), and follicular hyperplasia (FH). Normal appendix specimens from patients undergoing elective abdominal surgery were used as the control group (NL). All sections were exposed to proteinase K, incubated with anti-serotonin, chromogranin A, and synaptophysin antibodies, and treated with the LSAB kit. Polygonal cells were seen within the crypt epithelium (enterochromaffin cell, EC) and within the lamina propria (subepithelial neuroendocrine cell, SNC). In AA, only 16 cases (64%) showed serotonin staining in non-destructed glands. There was a significant reduction in the number of ECs in AA compared to the FH (96%), NA (100%) and NL (100%) groups (P<0.001). Chromogranin and synaptophysin immunostaining also showed a significant reduction in the number of ECs in AA compared with the other three groups (P<0.001). SNC serotonin reactivity was lower in the AA group compared with the other groups (p<0.001). The inflamed appendix is markedly depleted of serotonin in the epithelium and lamina propria. Local serotonin release from ECs and SNCs in the appendix may act as an inflammatory mediator in appendicitis and is likely to be the source of raised blood serotonin in AA.

Diagn Histopathol. 1983 Jul-Dec;6(3-4):239-46.
Serotonin and its possible role in the painful non-inflamed appendix.
Dhillon AP, Rode J.
After immunohistochemical staining appendices without active inflammation but producing symptoms of appendicitis (N = 24) were compared with a control group of appendices removed incidental to another procedure (N = 26). Staining for neurone specific enolase (NSE) showed more instances of nerve ‘hyperplasia’ in the control group than in the appendices generating pain refuting the concept of neuroappendicopathy based on quantitative nerve changes. Serotonin staining identified subepithelial neuroendocrine cells (SNC) in 85 per cent of the specimens. All cases showed serotonin immunoreactive enterochromaffin cells (EC). Staining for serotonin was significantly decreased in the SNC in the painful group. There were no significant differences between the two groups in staining intensity of SNC and EC for substance P (SP). Vasoactive intestinal polypeptide (VIP) was not seen in the SNC and EC and there were no differences in nerve fibre staining for VIP. Serotonin is a neurotransmitter as well as mediator of inflammation. It is suggested that reduced staining for serotonin in painful appendices reflects discharge of stores which could be instrumental in inducing the pain in these cases. Continued serotonin release may then lead to acute appendicitis.

Clinical Chemistry December 1988 vol. 34 no. 12 2572-2574
Concentrations of serotonin in plasma–a test for appendicitis?
S M Singh, H G Dean, F T de Dombal, D H Wilson and M W Flowers
We assessed the value of measuring serotonin (5-hydroxytryptamine) in plasma (by HPLC) in the diagnosis of acute appendicitis. Values for patients with subsequently confirmed appendicitis (11-145 nmol/L, median 70 nmol/L) significantly (P congruent to 0.005) exceeded those for patients with abdominal pain in whom appendicitis was only a possible diagnosis (2-45 nmol/L, median 20 nmol/L). The results for appendicitis patients were bimodally distributed, with low results found in patients where surgery revealed gangrenous appendicitis with little viable appendicular tissue. We conclude that measuring serotonin may be of value in confirming or excluding the diagnosis of early acute appendicitis where the physical signs are equivocal, and thus helps reduce unnecessary appendectomies. However, serotonin is of little help in diagnosing gangrenous appendicitis, where physical signs are more likely to be clearcut.

Hepatogastroenterology. 2001 May-Jun;48(39):609-13.
Spot urine 5-hydroxy indole acetic acid and acute appendicitis.
Ilkhanizadeh B, Owji AA, Tavangar SM, Vasei M, Tabei SM.
BACKGROUND/AIMS:
Appendectomy for suspected appendicitis cases is a common procedure. Its clinical diagnosis needs to be supported by accurate confirmatory tests. No single paraclinical test with a high degree of sensitivity and specificity is available for its diagnosis. The appendix contains numerous serotonin-producing cells (enterochromaffin cells). In the inflammatory process and subsequent cell injury, serotonin is released and converted to 5-HIAA (5-hydroxy indole acetic acid). We studied the elevation of 5-HIAA in the spot urine of acute appendicitis patients.
METHODOLOGY:
5-HIAA was measured by high-performance liquid chromatography in the spot urine samples of 40 healthy individuals and 166 patients who presented to emergency units of the university hospitals with acute abdominal pain. The results of the urine concentrations were compared to the histopathology reports of the removed appendices and the final diagnosis of other diseases.
RESULTS:
From 80 cases with a presumptive diagnosis of appendicitis, 73 were operated on and seven cases discharged after a few hours observation. Sixty-five out of 66 documented appendicitis patients showed a striking increase of urinary spot 5-HIAA with significant differences vs. all cases of healthy control individuals (P < 0.001). The 5-HIAA values of all of the negative appendectomy cases (n = 7) and all of the discharged cases after the observation period (n = 7) were within healthy control ranges. The mean value of the appendicitis group (42.76 +/- 2.26 mumol/L) was also significantly higher vs. all other acute abdomens which could mimic acute appendicitis (P < 0.05) excepting gastroenteritis patients. Considering 20 mumol/L as the cutoff value sensitivity, specificity, positive and negative predictive values of this test for discriminating appendicitis in clinically suspected patients were 98%, 100%, 100% and 93%, respectively and in all acute abdomens were 98%, 71%, 69% and 98.6%, respectively. The patients with gastroenteritis also showed elevation of 5-HIAA (43.05 +/- 2.7 mumol/L) vs. other nonappendicitis groups (P < 0.05). CONCLUSIONS: We have concluded that measurement of 5-HIAA in spot urine is a highly reliable test supporting the clinical diagnosis of appendicitis and if it does not show an increase, appendicitis can be ruled out with a very high degree of confidence which helps to reduce unnecessary appendectomies. In clinically suspected appendicitis patients with diarrhea, an increase of 5-HIAA may not confirm the diagnosis.

Clin Biochem. 2004 Nov;37(11):985-9.
Urinary 5-hydroxy indole acetic acid as a test for early diagnosis of acute appendicitis.
Bolandparvaz S, Vasei M, Owji AA, Ata-Ee N, Amin A, Daneshbod Y, Hosseini SV.
OBJECTIVES:
Acute appendicitis (AA) is the most common abdominal emergency. The appendix has abundant serotonin containing cells. Upon inflammation, serotonin is released in the blood and converted into 5-HIAA (5-hydroxy indole acetic acid). Measurement of the urine 5-HIAA (U-5-HIAA) could be a reliable marker of inflammation of the appendix. We have compared the powers of test performance of spot U-5-HIAA and spot U-5-HIAA/creatinin with other routine laboratory tests used for the diagnosis of acute appendicitis.
DESIGN AND METHODS:
Urine, serum, and blood samples of 110 patients who were admitted and observed in the emergency units of two university hospitals were studied. 5-HIAA was measured using HPLC, C-reactive protein by immunoturbidometry, WBC by electronic cell counting, and urine creatinine by the Jaffe method. Diagnostic accuracy of the various tests was evaluated by receiver operating characteristic (ROC) analysis.
FINDINGS:
The mean of spot U-5-HIAA in 39 patients with AA (nongangrenous) was 32 +/- 2.6 micromol/L, which was much higher than the mean of 40 non-appendicitis patients (NA) (5.5 +/- 0.6), 10 follicular hyperplasia (7.5 +/- 2.1), and 50 healthy control cases (4.1 +/- 0.5) with P < 0.001. The concentration of U-5-HIAA in 21 patients with gangrenous appendicitis (GA) (13.8 +/- 2.1) was also higher than NA patients and healthy individuals but lower than AA cases (P < 0.05). Considering 10 micromol/L as the cutoff point, this test shows 84% sensitivity and 88% specificity, with 90% and 81% positive and negative predictive values, respectively. The area under ROC curve (AUC) of U-5-HIAA in the diagnosis of AA (AUC = 0.903) was much larger than AUCs of U-5-HIAA/Cr (0.787), WBC (0.703), and CRP (0.660). CONCLUSION: Urinary secretion of 5-HIAA increases significantly in acute appendicitis and measurement of spot U-5-HIAA gives higher diagnostic accuracy than other routine laboratory tests. While the inflammation progresses to necrosis of the appendix, the concentration of 5-HIAA decreases. This decrease could be a warning sign of perforation of the appendix.

Am J Emerg Med. 2009 May;27(4):409-12.
The importance of urine 5-hydroxyindoleacetic acid levels in the early diagnosis of acute appendicitis.
Mentes O, Eryilmaz M, Harlak A, Yaman H, Yigit T, Ongoru O, Balkan M, Kozak O, Tufan T.
PURPOSE:
Acute appendicitis is one of the most common surgical emergencies. Diagnosis is usually made depending on the presenting history, clinical evaluation, and laboratory tests. The aim of this study was to investigate the role of urinary 5-hydroxyindoleacetic acid (U-5-HIAA) in the early diagnosis of acute appendicitis.
METHODS:
Thirty-five pigmented male rabbits were divided into 5 groups. Group 1 is the control (n = 7); group 2 is the sham (n = 10). The appendix was ligated from its base, and an appendectomy was performed after 12, 24, 36 hours in group 3 (n = 7), group 4 (n = 7), and group 5 (n = 7), respectively. Spot urine samples were obtained for U-5-HIAA determination, and appendectomy tissues were examined histopathologically.
RESULTS:
Acute appendicitis was diagnosed in all animals in group 3, group 4, and group 5, and the mean levels of U-5-HIAA in group 3 were higher than in the other groups. The mean of U-5-HIAA levels between animals with appendicitis and those without showed a significant difference (P = .003). The U-5-HIAA cutoff point of 4.15 mg/g creatinine had a sensitivity of 85%, a specificity of 64.29%, and an accuracy of 76% (area under curve = 0.805) for acute appendicitis. The probability of acute appendicitis is found to be 10, 2 times more when the U-5-HIAA level is greater than 4.15 mg/g creatinine.
CONCLUSION:
We have concluded that spot U-5-HIAA level increases significantly in the early stages of acute appendicitis.

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Intestinal Bacteria Synthesize Vitamin K2

Also see:
Vitamin K, Calcification, & Atherosclerosis
Bone Health and Vitamin K

Am J Gastroenterol. 1994 Jun;89(6):915-23.
The contribution of vitamin K2 (menaquinones) produced by the intestinal microflora to human nutritional requirements for vitamin K.
Conly JM, Stein K, Worobetz L, Rutledge-Harding S.
BACKGROUND:
Coagulopathy manifest by elevation of the prothrombin time (PT) in patients receiving broad spectrum antimicrobials indirectly suggests a role for intestinal microflora synthesized menaquinone (MK) in the maintenance of normal coagulation. Nonetheless, no direct evidence is available to support this contention.
OBJECTIVE:
Our objective was therefore to provide evidence that bacterially produced MK may be absorbed by the distal small bowel of humans.
METHODS:
Using a cell harvester, Staphylococcus aureus (ATCC 29213) was grown in 12-L batches, harvested, and extracted by high performance liquid chromatography (HPLC) to obtain 8 mg of pure MK. Four normal volunteers were placed on a diet severely restricted in vitamin K1 (median 32-40 U/day), and were given warfarin to maintain an International Normalized Ratio of approximately 2.0. On the 10th day of warfarin administration, naso-ileal intubation was performed and 1.5 mg of MK was delivered into the ileum. PT, factor VII, II and serum vitamin K1 levels were monitored throughout the study.
RESULTS:
Mean serum vitamin K1 levels were reduced to 30% of the pre-diet value at the time of MK administration. Within 24 h of ileal MK administration, there was a significant (p < 0.05) increase in the factor VII level of 0.28 +/- 0.10 U/ml (mean +/- SEM) and a significant decrease of 2.5 (+/- 0.1) s in the PT, whereas in the control phase (during which no MK was administered), there were no significant changes in the PT or factor VII at corresponding time intervals.
CONCLUSION:
These data provide direct evidence for the absorption of vitamin K2 from the distal small bowel, supporting a definite role for bacterially synthesized vitamin K2 in contributing to the human nutritional requirements of this vitamin.

Prog Food Nutr Sci. 1992 Oct-Dec;16(4):307-43.
The production of menaquinones (vitamin K2) by intestinal bacteria and their role in maintaining coagulation homeostasis.
Conly JM, Stein K.
Vitamin K is an essential cofactor necessary for the production of clotting factors II, VII, IX, and X in humans and has recently been found to be an essential factor for many other proteins in the body. There are two sources of this essential vitamin, including vitamin K1, or phylloquinone which is primarily found in green leafy vegetables and vitamin K2 or menaquinone which is synthesized by certain intestinal bacteria. The precise contribution of the bacterially synthesized menaquinone to overall vitamin K requirements in man is unknown. This paper reviews the available literature regarding the production and liberation of menaquinones from bacteria, the animal experiments which have been done to examine the absorption of menaquinones and the indirect and direct evidence in humans regarding utilization of menaquinones. The preponderance of the evidence suggests that bacterially synthesized menaquinones, particularly in the ileum can and do play a significant role in contributing to vitamin K requirements in humans to prevent clinically significant coagulopathy, especially during periods of episodic dietary lack of the vitamin.

Clin Invest Med. 1993 Feb;16(1):45-57.
The absorption and bioactivity of bacterially synthesized menaquinones.
Conly JM, Stein KE.
After optimizing conditions for maximal production of menaquinones (MK), S. aureus and B. vulgatus were grown in batches, harvested and extracted for qualitative and quantitative MK content utilizing HPLC (high performance liquid chromatography) until a total of 6 mg was available. Five normal healthy male volunteers were placed on a vitamin K1 deficient diet (< or = 25 micrograms/day) and were subsequently warfarinized to maintain a prothrombin time (PT) 1.5-2 times control. Following stabilization of daily warfarin dosage 1 mg doses of the extracted MK were orally administered. As a control, the same volunteers were later warfarinized but no MK was given. Within 24 h of MK administration the prothrombin time (PT) decreased (mean +/- SEM) 3.6 +/- 1.0 s (p < 0.005) and the Factor VII level increased 0.36 +/- 0.3 u/ml (p < 0.005) vs a PT increase of 1.0 +/- 1.0 s (p > 0.1) and a Factor VII level increase of 0.03 +/- 0.1 u/ml (p > 0.1) in the control phase. Within 48 h of MK administration the PT was normal in all subjects but remained > or = 1.5 times control in the control phase. These data demonstrate for the first time the absorption and bioactivity of bacterially synthesized vitamin K in humans.

Some of the benefit from antibiotics probably results from the reduced endotoxin stress when intestinal bacteria are suppressed. However, antibiotics can kill the intestinal bacteria that produce vitamin K, so it’s important to include that in the diet when antibiotics are used. -Ray Peat, PhD

Clin Invest Med. 1994 Dec;17(6):531-9.
Reduction of vitamin K2 concentrations in human liver associated with the use of broad spectrum antimicrobials.
Conly J, Stein K.
It is unclear whether menaquinones produced by the intestinal microflora play any role in human nutrition. Reports of coagulopathy due to vitamin K deficiency occurring in patients receiving broad spectrum antibiotics indirectly suggest that vitamin K2 produced by the gut microflora may be utilized by the host. We analyzed the vitamin K1 (phylloquinone) and vitamin K2 (menaquinone) content in a convenience sample of 22 human post-mortem liver samples, including 9 individuals who had been receiving broad spectrum antimicrobials prior to death and 13 individuals who had been victims of sudden, unexpected deaths. There were no significant differences in the mean (+/- SEM) phylloquinone content between the 2 groups [21.9 (+/- 15.5) vs. 16.0 (+/- 9.3) pmol/g wet weight (excluding those who had received supplemental vitamin K1)] but there was a significant difference (p < 0.05) in the total menaquinone (MK) content, 70.0 (+/- 23.3) vs. 423.1 (+/- 141) pmol/g between the 2 groups. These findings suggest an association between receipt of broad spectrum antibiotics and a reduction in hepatic menaquinone concentration, lending support to the hypothesis that a reduction in the gut microflora responsible for their production leads to reduced hepatic stores of this form of the vitamin.

Biochim Biophys Acta. 1999 Jan 4;1426(1):43-52.
Gender differences in hepatic phylloquinone and menaquinones in the vitamin K-deficient and -supplemented rat.
Huber AM, Davidson KW, O’Brien-Morse ME, Sadowski JA.
Gender differences in relation to vitamin K were investigated in the rat. Hepatic phylloquinone and menaquinone (MK-1 to MK-10) concentrations, gamma-carboxyglutamic acid (Gla) excretion, plasma phylloquinone and percent prothrombin were measured in male and female rats on a chow diet (24.5 ng phylloquinone and 8.8 microgram menadione), and on phylloquinone-deficient and -supplemented purified diets (0.38 and 1400 ng phylloquinone/g, respectively). Mean hepatic phylloquinone concentrations varied with dietary intake and ranged from 6.8+/-9.0 pmol/g in the deficient male, to 171. 1+/-56.9 pmol/g in the supplemented female. Menaquinones accounted for a large proportion of total vitamin K in the liver of males and females with MK-4, MK-6, and MK-10 present in highest concentrations. On the chow and supplemented diets, females had significantly higher MK-4, MK-6, and MK-10 concentrations in their livers (P<0.05). On the phylloquinone-deficient diet (-K1), hepatic phylloquinone, MK-4, and to a lesser extent MK-6 (but not MK-10) were significantly reduced (P<0.05). In the phylloquinone-supplemented male and female groups, which did not receive menadione during the experimental period, MK-4 increased above that in the chow groups suggesting synthesis of MK-4 from phylloquinone which was statistically significant in the female (P<0.01). A significant gender difference (P<0.05) was also observed for urinary Gla excretion with less Gla excreted by the females indicating that females may require less dietary phylloquinone than males of the same body weight.

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Enzyme to Know: Tryptophan Hydroxylase

Also see:
Tryptophan Metabolism: Effects of Progesterone, Estrogen, and PUFA
Intestinal Serotonin and Bone Loss
Serotonin and Melatonin Lower Progesterone
Role of Serotonin in Preeclampsia
Maternal Ingestion of Tryptophan and Cancer in Female Offspring
Melatonin Lowers Body Temperature
Tryptophan, Sleep, and Depression
Carbohydrate Lowers Free Tryptophan
Gelatin > Whey
Serotonin, Fatigue, Training, and Performance
Gelatin, Glycine, and Metabolism
Whey, Tryptophan, & Serotonin
Omega -3 “Deficiency” Decreases Serotonin Producing Enzyme
Hypothyroidism and Serotonin
Estrogen Increases Serotonin
10 Tips for Better Sleep

“Three important kinds of enzymes that are activated by stress and radiation are phospholipases (that release fatty acids), tryptophan hydroxylase (that controls the conversion of tryptophan to serotonin), and aromatase (estrogen synthetase, that converts androgens to estrogen). The products of these enzymes stimulate cell division, and produce features ofthe inflammatory process, including the leakiness of capillaries.” -Ray Peat, PhD

Since estrogen promotes serotonin, progesterone is likely to be the protective factor (Donner & Handa, 2009; Hiroi, et al., 2006; Berman, et al., 2006; Bethea, et al., 2000). -Ray Peat, PhD

Biol Psychiatry. 2006 Aug 1;60(3):288-95. Epub 2006 Feb 3.
Estrogen selectively increases tryptophan hydroxylase-2 mRNA expression in distinct subregions of rat midbrain raphe nucleus: association between gene expression and anxiety behavior in the open field.
Hiroi R, McDevitt RA, Neumaier JF.
BACKGROUND:
Ovarian steroids modulate anxiety behavior, perhaps by regulating the serotonergic neurons in the midbrain raphe nucleus. The regulation of the brain-specific isoform of rat tryptophan hydroxylase (TPH2) by ovarian hormones has not yet been investigated. Therefore, we examined the effects of estrogen and progesterone on TPH2 mRNA in the rat dorsal and median raphe nuclei (DRN and MRN, respectively) and whether TPH2 mRNA levels correlated with anxiety behavior.
METHODS:
Ovariectomized rats were treated for two weeks with placebo, estrogen or estrogen plus progesterone, exposed to the open field test, and TPH2 mRNA was quantified by in situ hybridization histochemistry.
RESULTS:
Estrogen increased TPH2 mRNA in the mid-ventromedial and caudal subregions of the DRN and the caudal MRN. Combined estrogen and progesterone treatment did not change TPH2 mRNA relative to ovariectomized controls. TPH2 mRNA in caudal DRN was associated with lower anxiety-like behavior, whereas TPH2 mRNA in rostral dorsomedial DRN was associated with increased anxiety-like behavior.
CONCLUSIONS:
These results suggest that estrogen may increase the capacity for serotonin synthesis in discrete subgroups of raphe neurons, and reinforce previous observations that different subregions of DRN contribute to distinct components of anxiety behavior.

Int J Dev Neurosci. 1996 Aug;14(5):641-8.
Nutritional recovery does not reverse the activation of brain serotonin synthesis in the ontogenetically malnourished rat.
Manjarrez GG, Magdaleno VM, Chagoya G, Hernández J.
In the present work we confirm that gestational malnutrition effects body and brain composition and results in an activation of the synthesis of the brain neurotransmitter 5-hydroxytryptamine. These results also demonstrate more activity of the rate-limiting enzyme tryptophan hydroxylase in the malnourished fetal and postnatal brain. However, the activity of this enzyme remains increased in the brain of nutritionally recovered animals accompanied by an increase in the synthesis of 5-hydroxytryptamine. We therefore suggest that, in the nutritionally recovered animal, the mechanism of activation of this biosynthetic path in the brain may be not dependent on the increased availability of free L-tryptophan observed in malnourished animals, but might be due to a specific change in the enzyme complex itself. This hypothesis is supported by the fact that plasma free and brain L-tryptophan return to normal in the recovered animal.

“An excess of tryptophan in the diet, especially with deficiencies of other nutrients, can combine with inflammation to increase serotonin. Polyunsaturated fatty acids promote the absorption of tryptophan by the brain, and its conversion to serotonin. A “deficiency” of polyunsaturated fat decreases the expression of the enzyme that synthesizes serotonin (McNamara, et al., 2009). -Ray Peat, PhD

J Psychiatr Res. 2009 Mar;43(6):656-63. Epub 2008 Nov 4.
Omega-3 fatty acid deficiency during perinatal development increases serotonin turnover in the prefrontal cortex and decreases midbrain tryptophan hydroxylase-2 expression in adult female rats: dissociation from estrogenic effects.
McNamara RK, Able J, Liu Y, Jandacek R, Rider T, Tso P, Lipton JW.
A dysregulation in central serotonin neurotransmission and omega-3 fatty acid deficiency have been implicated in the pathophysiology of major depression. To determine the effects of omega-3 fatty acid deficiency on indices of serotonin neurotransmission in the adult rat brain, female rats were fed diets with or without the omega-3 fatty acid precursor alpha-linolenic acid (ALA) during perinatal (E0-P90), post-weaning (P21-P90), and post-pubescent (P60-130) development. Ovariectomized (OVX) rats and OVX rats with cyclic estrogen treatment were also examined. Serotonin (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) content, and fatty acid composition were determined in the prefrontal cortex (PFC), and tryptophan hydroxylase-2 (TPH-2), serotonin transporter, and 5-HT(1A) autoreceptor mRNA expression were determined in the midbrain. ALA deficiency during perinatal (-62%, p=0.0001), post-weaning (-34%, p=0.0001), and post-pubertal (-10%, p=0.0001) development resulted in a graded reduction in adult PFC docosahexaenoic acid (DHA, 22:6n-3) composition. Relative to controls, perinatal DHA-deficient rats exhibited significantly lower PFC 5-HT content (-65%, p=0.001), significant greater 5-HIAA content (+15%, p=0.046), and a significant greater 5-HIAA/5-HT ratio (+73%, p=0.001). Conversely, post-weaning DHA-deficient rats exhibited significantly greater PFC 5-HT content (+12%, p=0.03), no change in 5-HIAA content, and a significantly smaller 5-HIAA/5-HT ratio (-9%, p=0.01). Post-pubertal DHA-deficient and OXV rats did not exhibit significant alterations in PFC 5-HT or 5-HIAA content. Only perinatal DHA-deficient rats exhibited a significant reduction in midbrain TPH-2 mRNA expression (-29%, p=0.03). These preclinical data support a causal link between perinatal omega-3 fatty acid deficiency and reduced central serotonin synthesis in adult female rats that is independent of ovarian hormones including estrogen.

Nat Med. 2015 Feb 5;21(2):114-6. doi: 10.1038/nm.3797.
Reducing peripheral serotonin turns up the heat in brown fat.
Carey AL1, Kingwell BA1.
Obesity is a major risk factor for chronic disease. A new study in mice reveals that lowering levels of the signaling molecule serotonin outside of the brain reduces obesity and its complications by increasing brown adipose tissue (BAT) energy expenditure.

Figure 1: Inhibition of peripheral serotonin production protects from diet-induced obesity and related complications.

“Serotonin and its derivative, melatonin, are both involved in the biology of torpor and hibernation.” -Ray Peat, PhD

“When an animal such as a squirrel approaches hibernation and is producing less carbon dioxide, the decrease in carbon dioxide releases serotonin, which slows respiration, lowers temperature, suppresses appetite, and produces torpor.

But in energy-deprived humans, increases of adrenalin oppose the hibernation reaction, alter energy production and the ability to relax, and to sleep deeply and with restorative effect.”-Ray Peat, PhD

“In squirrels, hibernation is brought on by the accumulation of unsaturated fats in the tissues, suppressing respiration and stimulating increased serotonin production. In humans, winter sickness is intensified by those same antithyroid substances, so it’s important to limit consumption of unsaturated fats and tryptophan (which is the source of serotonin). When a person is using a thyroid supplement, it’s common to need four times as much in December as in July.” -Ray Peat, PhD

“Although it is common to speak of sleep and hibernation as variations on the theme of economizing on energy expenditure, I suspect that nocturnal sleep has the special function of minimizing the stress of darkness itself, and that it has subsidiary functions, including its now well confirmed role in the consolidation and organization of memory. This view of sleep is consistent with observations that disturbed sleep is associated with obesity, and that the torpor-hibernation chemical, serotonin, powerfully interferes with learning.” -Ray Peat, PhD

Pharmacol Biochem Behav. 1993 Sep;46(1):9-13.
Involvement of brain tryptophan hydroxylase in the mechanism of hibernation.
Popova NK, Voronova IP, Kulikov AV.
Marked changes were revealed in the activity of the key enzyme in serotonin biosynthesis, tryptophan hydroxylase (TPH), during entry into hibernation, hibernation, and arousal in ground squirrels (Citellus erythrogenys). An increase in TPH activity was found in the midbrain, hippocampus, and striatum during the prehibernation period in euthermic ground squirrels. A further increase in TPH activity was observed during the entry into hibernation. Significant elevation was found not only in potential TPH activity measured at the incubation temperature of 37 degrees C but also at incubation temperature of 7 degrees C, approximating the body temperature in hibernation. Vmax in the midbrain of hibernating animals was about 50% higher than in active ones without significant changes in Km. Thus, brain TPH maintains functionality during torpidity and is activated before the entry into hibernation. The results support the idea that brain serotonin is crucially involved in the transition to and the maintenance of the hibernation state.

Pharmacol Biochem Behav. 1981 Jun;14(6):773-7.
Brain serotonin metabolism in hibernation.
Popova NK, Voitenko NN.
It has been shown that notwithstanding 2-fold decreased monoamine oxidase (MAO) activity in brain of hibernating ground squirrels (Citellus erythrogenys major, Brandt), serotonin (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) levels in most of the brain areas studied were not significantly different from the ones in active ground squirrels. However, marked changes were revealed in 5-HT and 5-HIAA brain level in entering hibernation (body temperature 11-9 degrees C) and arousing (body temperature 22 degrees C) animals. In entry into hibernation an increase in brain 5-HT, decrease in 5-HIAA level and lowered MAO activity was found. In arousal from hibernation 5-HT was decreased, 5-HIAA was increased and MAO activity was found to be increased to the level of the active ground squirrels.

The Journal of Neuroscience, 1 June 2016, 36(22): 6041-6049; doi: 10.1523/JNEUROSCI.2534-15.2016
Maternal Inflammation Disrupts Fetal Neurodevelopment via Increased Placental Output of Serotonin to the Fetal Brain
Nick Goeden1, Juan Velasquez, Kathryn A. Arnold, Yen Chan, Brett T. Lund, George M. Anderson6, and Alexandre Bonnin
Maternal inflammation during pregnancy affects placental function and is associated with increased risk of neurodevelopmental disorders in the offspring. The molecular mechanisms linking placental dysfunction to abnormal fetal neurodevelopment remain unclear. During typical development, serotonin (5-HT) synthesized in the placenta from maternal L-tryptophan (TRP) reaches the fetal brain. There, 5-HT modulates critical neurodevelopmental processes. We investigated the effects of maternal inflammation triggered in midpregnancy in mice by the immunostimulant polyriboinosinic-polyribocytidylic acid [poly(I:C)] on TRP metabolism in the placenta and its impact on fetal neurodevelopment. We show that a moderate maternal immune challenge upregulates placental TRP conversion rapidly to 5-HT through successively transient increases in substrate availability and TRP hydroxylase (TPH) enzymatic activity, leading to accumulation of exogenous 5-HT and blunting of endogenous 5-HT axonal outgrowth specifically within the fetal forebrain. The pharmacological inhibition of TPH activity blocked these effects. These results establish altered placental TRP conversion to 5-HT as a new mechanism by which maternal inflammation disrupts 5-HT-dependent neurogenic processes during fetal neurodevelopment.

SIGNIFICANCE STATEMENT The mechanisms linking maternal inflammation during pregnancy with increased risk of neurodevelopmental disorders in the offspring are poorly understood. In this study, we show that maternal inflammation in midpregnancy results in an upregulation of tryptophan conversion to serotonin (5-HT) within the placenta. Remarkably, this leads to exposure of the fetal forebrain to increased concentrations of this biogenic amine and to specific alterations of crucially important 5-HT-dependent neurogenic processes. More specifically, we found altered serotonergic axon growth resulting from increased 5-HT in the fetal forebrain. The data provide a new understanding of placental function playing a key role in fetal brain development and how this process is altered by adverse prenatal events such as maternal inflammation. The results uncover important future directions for understanding the early developmental origins of mental disorders.

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Carotenemia & Hypothyroidism

Also see:
The effect of raw carrot on serum lipids and colon function
The Cholesterol and Thyroid Connection

“In other words, the thyroid has a profound effect on the liver. We have other evidence that a lack of thyroid is accompanied by a sluggish liver. In the first place, it has been apparents for a century that patients with myxedema (very low thyroid activity) have a yellowish tint to their skins. This has been found to be due to the presence of too much carotene in the blood. The liver converts carotene into vitamin A which is colorless. Under the administration of thyroid, the liver becomes more active and the carotene soon disappears. In the second place, the cholesterol level in the blood is usually elevated in hypothyroidism. Thyroid administration will lower cholesterol, and if too much is given, the cholesterol will fall below normal. The liver converts cholesterol into bile salts which are eliminated in the bile; this process is the usual means of eliminating excess cholesterol. The liver is sluggish in this function among thyroid-deficient individuals…Since a sluggish liver is the most common cause of hypoglycemia, it should follow that the hypothyroid patient is highly susceptible to low blood sugar.” -Broda Barnes, MD, PhD and Charlotte Barnes

Quotes by Ray Peat, PhD:
“In the 1930’s accurate diagnosis [of hypothyroidism] was made by evaluating a variety of indications, including basal oxygen consumption, serum cholesterol level, pulse rate, temperature, carotenemia, bowel function, and quality of hair and skin.”

“Vitamin B12 and thyroid will lower the carotene quickly, but the calluses take a long time to wear off.”

“If your cholesterol is above 200, and the thyroid supplements didn’t warm you up, it’s possible that something is interfering with your steroid synthesis, which might be a deficiency of something like vitamin A, or interference from something like iron or carotene.”

“Yes, it’s definitely hard to get them coordinated when there’s an imbalance in one direction or the other. For several years, when I had an extremely high metabolic rate, I needed 100,000 units per day during sunny weather to prevent acne and ingrown whiskers, but when I moved to a cloudy climate, suddenly that much was too much, and suppressed my thyroid. The average person is likely to be hypothyroid, and to need only 5,000 units per day. Avoiding large amounts of carotene, and getting plenty of vitamin B12 to be able to convert any carotene that’s in your food, helps to use vitamin A efficiently.”

“Thomas H. McGavack’s 1951 book, The Thyroid, was representative of the earlier approach to the study of thyroid physiology. Familiarity with the different effects of abnormal thyroid function under different conditions, at different ages, and the effects of gender, were standard parts of medical education that had disappeared by the end of the century. Arthritis, irregularities of growth, wasting, obesity, a variety of abnormalities of the hair and skin, carotenemia, amenorrhea, tendency to miscarry, infertility in males and females, insomnia or somnolence, emphysema, various heart diseases, psychosis, dementia, poor memory, anxiety, cold extremities, anemia, and many other problems were known reasons to suspect hypothyroidism.”

“I avoid carotene, because it blocks thyroid and steroid production, and very large, excessive, amounts of vitamin A, retinol, can do the same.”

“Yes, vitamin A and estrogen are antagonistic, and while estrogen promotes keratinization (shedding of skin cells), vitamin A opposes it. Since vitamin A is highly unsaturated, in excess it suppresses the thyroid, so it has to be balanced with the thyroid; the combination is effective for increasing progesterone and decreasing estrogen, slowing the turnover of skin cells, and making the skin cells function longer before flaking off.”

“Long ago, people knew that polyunsaturated fats blocked proteolytic enzymes. The first effect of too much PUFA is to block the ability of the thyroid gland to secrete the hormone by breaking down the thyroid globulin. If the thyroid does manges to secrete it, the transport of it on proteins in the blood is inhibited in proportion to the unsaturation. Fish oils with 5 and 6 unsaturated double bonds are the most powerful, almost total inhibitors of thyroid transport. Linolenic acid (omega -3) fats with 3 double bonds inhibits about 50%, linoleic acid (omega -6) with 2 double bonds inhibits about 30%. So the inhibition is proportional to the amount of double bonds. The responsiveness of the cell to thyroid is inhibited in proportion to the amount of unsaturated fats. Carotene is highly unsaturated and it has the same effect of interfering with thyroid function because of this series of unsaturations.

Clin Pediatr (Phila). 1981 Jan;20(1):25-9.
Carotenemia. A review.
Lascari AD.
Awareness of carotenemia is important to avoid confusion with jaundice and unnecessary diagnostic studies. It is surprising how little information can be found about this relatively common condition in the standard pediatric textbooks. Ingestion of excessive amounts of carrots is the usual cause of carotenemia, but it can also be associated with ingestion of many other yellow vegetables, as well as some green vegetables. Mothers may unknowingly be giving their infants large amounts of carrots in the form of commercial infant food combinations. Carotenemia is a benign condition; vitamin A poisoning does not occur despite massive doses of carotene because the conversion of carotene to vitamin A is slow. Hypothyroidism, diabetes mellitus, hepatic and renal diseases may be associated with carotenemia, but are not caused by ingestion of carotene. The absence of yellow pigment in the sclera and oral cavities distinguishes carotenemia from jaundice. A similar disorder, lycopenemia, is associated with an orange-yellow skin pigmentation as a result of ingestion of large amounts of tomatoes.

The Journal of Pediatrics Volume 41, Issue 6 , Pages 784-791, December 1952
The carotenemia of hypothyroidism
Hugh W. Josephs, MD
Twenty-five cases of hypothyroidism were studied from the point of view of carotenemia, a number of them over a period of time during which thyroid medication was withdrawn and reinstituted.

The occurrence of carotenemia in hypothyroidism, long known, is confirmed. However, it is found only in those who ingest food containing carotene, so is not likely to be encountered in infancy.

It is regularly associated with lipemia and cholesterolemia, but the carotene tends to be relatively more increased than the lipids or cholesterol.

It was also found that when thyroid medication was withdrawn or instituted the resultant rise or fall in carotene tended to lag behind that of the total lipid. It was pointed out that carotene was probably “carried” by the lipids and as a result would not only show some lag in movement but would tend to accumulate in the blood stream when the lipids were increased.

It was felt that this behavior of carotene might well be a factor in the “failure” to convert carotene to vitamin A in hypothyroidism.

Acta Med Austriaca. 1993;20(1-2):17-20.
[Beta-carotene, vitamin A and carrier proteins in thyroid diseases].
[Article in German]
Aktuna D, Buchinger W, Langsteger W, Meister E, Sternad H, Lorenz O, Eber O.
The conversion of beta-carotene (provitamin A) to 2 molecules of vitamin A (retinol) is accelerated by thyroxine and hyperthyroidism, respectively. The characteristic yellow tint of the skin in hypothyroidism is due to hyper-beta-carotenemia. Both in hyper- and hypothyroidism in a retinol deficiency has been observed in literature. In a series of 36 patients (16 hyper-, 8 hypo-, and 12 euthyroid) serum samples were analyzed for retinol and beta-carotene levels (high pressure liquid chromatography) as well as retinol binding protein (radial immune diffusion), prealbumin (nephelometry), and serum zinc values (atomic absorption spectrometry) were established. The beta-carotene serum level in the hypothyroid group (mean 1.1 microgram/ml) was significantly higher (p < 0.05) in relation to euthyroid controls (0.6 microgram/ml), the hyperthyroid group showed significantly lower values (0.3 microgram/ml). RBP and prealbumin concentrations were significantly lower (p < 0.05) in hyperthyroid as against eu- and hypothyroid patients. Surprisingly, in all 3 groups the retinol levels were not significantly different, although the hyperthyroid group was slightly lower (0.6 microgram/ml) than the mean value of 0.7 micrograms/ml in the other groups. A vitamin A and protein rich food, customary in Central Europe, seems to rule out any vitamin A deficiency both in hyper- and hypothyroidism. However, the beta-carotene values are significantly higher in hypothyroidism, while in hyperthyroidism they were lower. As intrahepatic zinc content plays an important role in the synthesis of RBP and its secretion together with retinol, we also analyzed this component: The serum zinc levels in hyperthyroid patients were clearly higher (79.1 micrograms/dl) than in the hypothyroid group with 57 micrograms/dl (p < 0.05).

Pediatr Dermatol. 2004 Nov-Dec;21(6):657-9.
Carotenemia associated with green bean ingestion.
Sale TA, Stratman E.
Carotenemia is a condition characterized by yellow discoloration of the skin and elevated blood carotene levels. Excessive and prolonged ingestion of carotene-rich, yellow- or orange-colored foods such as carrots and winter squash is the most common cause, but more rarely it may be associated with consumption of other foods as well as with hypothyroidism, diabetes mellitus, anorexia nervosa, liver disease, or kidney disease. Though not uncommon in children, there are few reports in the pediatric literature since its early descriptions in the late 1800s and early 1900s. Awareness of carotenemia can help the provider resolve confusion with jaundice and avoid unnecessary worry and costly tests. Herein we describe carotenemia in an 8-month-old Caucasian girl secondary to increased consumption of commercial infant food green beans.

J Dermatol. 2006 Feb;33(2):132-4.
A case of carotenemia associated with ingestion of nutrient supplements.
Takita Y, Ichimiya M, Hamamoto Y, Muto M.
Carotenemia is characterized by an abnormal yellowish orange pigmentation of the skin, most prominently seen on the palms and soles. Although it is associated with several disease such as diabetes, hypothyroidism and anorexia nervosa, it is caused by excessive intake of carotene-rich food such as oranges and carrots in most cases. Herein, we describe an interesting case of carotenemia in a 66-year-old female secondary to increased ingestion of oral supplements of carotene in order to improve hemorrhage in the eyeground. There could be an increasing trend of intake of commercial nutrient supplements in which case it is necessary to remind ourselves that commercial nutrient supplements could cause various skin disorders as side-effects.

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Enzyme to Know: Pyruvate Dehydrogenase

“Energy depletion itself is an excitatory state, that calls for increased fuel and oxygen. But when cells are exposed to PUFA, their ability to use glucose is blocked, increasing their exposure to the fats. Saturated fats activate the pyruvate dehydrogenase enzyme that is essential for the efficient use of glucose, while PUFA block it.” -Ray Peat, PhD

“Estrogen impairs the mitochondria in multiple ways, including blocking the function of cytochrome oxidase, decreasing the activity of ATP synthase, increasing heme oxygenase which produces carbon monoxide and free iron, damaging mitochondrial DNA, and shifting metabolism from glucose oxidation to fat oxidation, especially by inhibiting the mitochondrial pyruvate dehydrogenase complex. These changes, including the loss of cytochrome oxidase, are seen in the Alzheimer’s brain. The fact that this kind of energy impairment can be produced by estrogen doesn’t imply that estrogen is the cause, since many other things can cause similar effects–radiation, aluminum, and endotoxin, for example.” -Ray Peat, PhD

Biochim Biophys Acta. 1993 Aug 11;1169(2):126-34.
Dietary polyunsaturated fats suppress the high-sucrose-induced increase of rat liver pyruvate dehydrogenase levels.
Da Silva LA, De Marcucci OL, Kuhnle ZR.
Pyruvate dehydrogenase complex (PDC) has a key role in the regulation of hepatic lipogenesis by dietary factors. We have investigated the effects of dietary carbohydrate and fat on hepatic PDC. Sucrose-based or starch-based diets were administered for 15 days. A positive correlation between PDC activity and the lipogenic potential of the diet was found. A high-sucrose, fat-free diet caused a 3-fold increase in total activity whereas a high-starch, fat-free diet caused a 1.5-fold increase, as compared with chow-fed rats. Dietary polyunsaturated fat (PUF) caused a marked inhibitory effect on total and active PDC; fish oil being more effective than corn oil. Dietary saturated fat (butter) failed to inhibit the sucrose-induced elevation in total activity, but was almost as effective as fish oil in depressing percent active enzyme. Changes in total PDC activity closely correlated with modifications in the content of enzyme quantitated by immunoblotting, indicating that increased enzyme content and not activation is the predominant mechanism underlying the adaptive response to high-sucrose feeding. This response is suppressed by dietary PUF. Inhibition of hepatic lipogenesis by PUF involves a reduction of PDC content as well as that of several lipogenic enzymes. The relevant mechanisms remain to be established.

Biochemistry. 1998 Nov 10;37(45):15835-41.
Selective inactivation of alpha-ketoglutarate dehydrogenase and pyruvate dehydrogenase: reaction of lipoic acid with 4-hydroxy-2-nonenal.
Humphries KM, Szweda LI.
Previous research has established that 4-hydroxy-2-nonenal (HNE), a highly toxic product of lipid peroxidation, is a potent inhibitor of mitochondrial respiration. HNE exerts its effects on respiration by inhibiting alpha-ketoglutarate dehydrogenase (KGDH). Because of the central role of KGDH in metabolism and emerging evidence that free radicals contribute to mitochondrial dysfunction associated with numerous diseases, it is of great interest to further characterize the mechanism of inhibition. In the present study, treatment of rat heart mitochondria with HNE resulted in the selective inhibition of KGDH and pyruvate dehydrogenase (PDH), while other NADH-linked dehydrogenases and electron chain complexes were unaffected. KGDH and PDH are structurally and catalytically similar multienzyme complexes, suggesting a common mode of inhibition. To determine the mechanism of inhibition, the effects of HNE on purified KGDH and PDH were examined. These studies revealed that inactivation by HNE was greatly enhanced in the presence of substrates that reduce the sulfur atoms of lipoic acid covalently bound to the E2 subunits of KGDH and PDH. In addition, loss of enzyme activity induced by HNE correlated closely with a decrease in the availability of lipoic acid sulfhydryl groups. Use of anti-lipoic acid antibodies indicated that HNE modified lipoic acid in both purified enzyme preparations and mitochondria and that this modification was dependent upon the presence of substrates. These results therefore identify a potential mechanism whereby free radical production and subsequent lipid peroxidation lead to specific modification of KGDH and PDH and inhibition of NADH-linked mitochondrial respiration.

The ability of the mitochondria to oxidize pyruvic acid and glucose is characteristically lost to some degree in cancer. When this oxidation fails, the disturbed redox balance of the cell will usually lead to the cell’s death, but if it can survive, this balance favors growth and cell division, rather than differentiated function. This was Otto Warburg’s discovery, that was rejected by official medicine for 75 years. Cancer researchers have become interested in this enzyme system that controls the oxidation of pyruvic acid (and thus sugar) by the mitochondria, since these enzymes are crucially defective in cancer cells (and also in diabetes). The chemical DCA, dichloroacetate, is effective against a variety of cancers, and it acts by reactivating the enzymes that oxidize pyruvic acid. Thyroid hormone, insulin, and fructose also activate these enzymes. These are the enzymes that are inactivated by excessive exposure to fatty acids, and that are involved in the progressive replacement of sugar oxidation by fat oxidation, during stress and aging, and in degenerative diseases; for example, a process that inactivates the energy-producing pyruvate dehydrogenase in Alzheimer’s disease has been identified (Ishiguro, 1998). Niacinamide, by lowering free fatty acids and regulating the redox system, supporting sugar oxidation, is useful in the whole spectrum of metabolic degenerative diseases. -Ray Peat, PhD

J Biol Chem. 2008 Aug 15;283(33):22700-8. Epub 2008 Jun 9.
Pyruvate dehydrogenase complex activity controls metabolic and malignant phenotype in cancer cells.
McFate T, Mohyeldin A, Lu H, Thakar J, Henriques J, Halim ND, Wu H, Schell MJ, Tsang TM, Teahan O, Zhou S, Califano JA, Jeoung NH, Harris RA, Verma A.
High lactate generation and low glucose oxidation, despite normal oxygen conditions, are commonly seen in cancer cells and tumors. Historically known as the Warburg effect, this altered metabolic phenotype has long been correlated with malignant progression and poor clinical outcome. However, the mechanistic relationship between altered glucose metabolism and malignancy remains poorly understood. Here we show that inhibition of pyruvate dehydrogenase complex (PDC) activity contributes to the Warburg metabolic and malignant phenotype in human head and neck squamous cell carcinoma. PDC inhibition occurs via enhanced expression of pyruvate dehydrogenase kinase-1 (PDK-1), which results in inhibitory phosphorylation of the pyruvate dehydrogenase alpha (PDHalpha) subunit. We also demonstrate that PDC inhibition in cancer cells is associated with normoxic stabilization of the malignancy-promoting transcription factor hypoxia-inducible factor-1alpha (HIF-1alpha) by glycolytic metabolites. Knockdown of PDK-1 via short hairpin RNA lowers PDHalpha phosphorylation, restores PDC activity, reverts the Warburg metabolic phenotype, decreases normoxic HIF-1alpha expression, lowers hypoxic cell survival, decreases invasiveness, and inhibits tumor growth. PDK-1 is an HIF-1-regulated gene, and these data suggest that the buildup of glycolytic metabolites, resulting from high PDK-1 expression, may in turn promote HIF-1 activation, thus sustaining a feed-forward loop for malignant progression. In addition to providing anabolic support for cancer cells, altered fuel metabolism thus supports a malignant phenotype. Correction of metabolic abnormalities offers unique opportunities for cancer treatment and may potentially synergize with other cancer therapies.

Rinsho Byori. 1998 Oct;46(10):1003-7.
[Involvement of tau protein kinase in amyloid-beta-induced neurodegeneration].
[Article in Japanese]
Ishiguro K.
Histopathological features of Alzheimer’s disease (AD) include extracellular deposits of amyloid beta (A beta) fibrils in the cores of senile plaques, intracellular neurofibrillary tangles (NFT) which are composed of paired helical filaments (PHF), and neuronal cell loss. The main component of PHF is highly phosphorylated tau protein. We identified a protein kinase converting normal tau into a PHF-like state. The kinase is tau protein kinase (TPK) I/glycogen synthase kinase (GSK)-3 beta. Using a neuronal cell culture system as an AD model, it was recognized that TPK I/GSK-3 beta plays a central role in AD pathology. We hypothesize that A beta-induced neuronal cell death occurs by the following mechanism. A beta inactivates PI3-kinase and activates TPK I/GSK-3 beta, which in turn phosphorylates and inactivates both tau and pyruvate dehydrogenase (PDH). After the ability of tau to promote microtubule assembly is diminished by phosphorylation, soluble tau molecules aggregate into PHF by an unknown mechanism. Destabilization of microtubule arrays causes inhibition of axonal transport and accumulation of amyloid precursor protein (APP). Phosphorylation of PDH inhibits the reaction converting pyruvate to acetyl-CoA, resulting in inhibition of energy metabolism and a decrease in acetylcholine, both of which are also characteristics of AD. These changes may lead to neuronal cell death.

Otto Warburg established that lactic acid production even in the presence of oxygen is a fundamental property of cancer. It is, to a great degree, the lactic acid which triggers the defensive reactions of the organism, leading to tissue wasting from excessive glucocorticoid hormone. The cancer’s production of lactic acid creates the same kind of internal imbalance produced by hyperventilation, and if we look at the physiology of hyperventilation in the light of Warburg’s description of cancer, hyperventilation imitates cancer metabolism, by producing lactic acid “even in the presence of oxygen.” Lactate, a supposedly benign metabolite of the cancer cells, which appears in all the other degenerative conditions, including obesity, diabetes, Alzheimer’s disease, multiple sclerosis, is itself a factor in the degenerative process. -Ray Peat, PhD

Lactic acid itself, and the longer chain fatty acids, inhibit the regulatory enzyme pyruvate dehydrogenase (which is activated by insulin), reducing the oxidative production of energy. Drugs to activate this enzyme are being studied by the pharmaceutical industry as treatments for diabetes and cancer. (for example, DCA, dichloroacetate). -Ray Peat, PhD

Nihon Geka Gakkai Zasshi. 1996 Sep;97(9):726-32.
[Energy substrate metabolism during stress].
[Article in Japanese]
Sugimoto H.
Energy substrate metabolism during stress is characterized by increased REE (resting energy expenditure), hyperglycemia, hyperlactatemia and protein catabolism. This stress-induced hypermetabolic responses are closely related to increased secretion of neurohormonal and cytokine mediators. The insulin resistance hyperglycemia has been called “stress diabetes” or “surgical diabetes”. Glucose disposal has been thought to be impaired in this condition. However, glucose uptake in most tissue is non-insulin mediated. Recent studies showed glucose uptake elevated in sepsis or TNF infusion. Insulin-regulatable glucose transporter (GLUT4) is present only in muscle, heart and adipose tissues. It was demonstrated that insulin binding to membrane receptors in these tissues was intact. This hyperglycemia in stress diabetes results from a postreceptor mechanism. Stress hyperlactatemia is thought to be caused by decreased pyruvate dehydrogenase activity rather than tissue hypoperfusion. Hyperlactatemia may promote gluconeogenesis. Glucose is a essential energy substrate in some tissues such as brain, erythrocyte and leukocyte. Hyperglycemia may be viewed as a beneficial response during stress.

J Appl Physiol. 2008 Jan;104(1):1-9. Epub 2007 Oct 18.
The acute effects of differential dietary fatty acids on human skeletal muscle pyruvate dehydrogenase activity.
Bradley NS, Heigenhauser GJ, Roy BD, Staples EM, Inglis JG, LeBlanc PJ, Peters SJ.
Pyruvate dehydrogenase (PDH) is an important regulator of carbohydrate oxidation during exercise, and its activity can be downregulated by an increase in dietary fat. The purpose of this study was to determine the acute metabolic effects of differential dietary fatty acids on the activation of the PDH complex (PDHa activity) at rest and at the onset of moderate-intensity exercise. University-aged male subjects (n = 7) underwent two fat-loading trials spaced at least 2 wk apart. Subjects consumed approximately 300 g saturated (SFA) or n-6 polyunsaturated fatty acid (PUFA) fat over the course of 5 h. Following this, participants cycled at 65% of their maximum oxygen uptake for 15 min. Muscle biopsies were taken before and following fat loading and at 1 min exercise. Plasma free fatty acids increased from 0.15 +/- 0.07 to 0.54 +/- 0.19 mM over 5 h with SFA and from 0.11 +/- 0.04 to 0.35 +/- 0.13 mM with n-6 PUFA and were significantly lower throughout the n-6 PUFA trial. PDHa activity was unchanged following fat loading but increased at the onset of exercise in the SFA trial, from 1.18 +/- 0.27 to 2.16 +/- 0.37 mmol x min(-1) x kg wet wt(-1). This effect was negated in the n-6 PUFA trial (1.04 +/- 0.20 to 1.28 +/- 0.36 mmol x min(-1) x kg wet wt(-1)). PDH kinase was unchanged in both trials, suggesting that the attenuation of PDHa activity with n-6 PUFA was a result of changes in the concentrations of intramitochondrial effectors, potentially intramitochondrial NADH or Ca(2+). Our findings suggest that attenuated PDHa activity contributes to the preferential oxidation of n-6 PUFA during moderate-intensity exercise.

PLoS One. 2013 Oct 7;8(10):e77280. doi: 10.1371/journal.pone.0077280. eCollection 2013.
Rapid Inhibition of Pyruvate Dehydrogenase: An Initiating Event in High Dietary Fat-Induced Loss of Metabolic Flexibility in the Heart
Clair Crewe, Michael Kinter, Luke I. Szweda
Cardiac function depends on the ability to switch between fatty acid and glucose oxidation for energy production in response to changes in substrate availability and energetic stress. In obese and diabetic individuals, increased reliance on fatty acids and reduced metabolic flexibility are thought to contribute to the development of cardiovascular disease. Mechanisms by which cardiac mitochondria contribute to diet-induced metabolic inflexibility were investigated. Mice were fed a high fat or low fat diet for 1 d, 1 wk, and 20 wk. Cardiac mitochondria isolated from mice fed a high fat diet displayed a diminished ability to utilize the glycolytically derived substrate pyruvate. This response was rapid, occurring within the first day on the diet, and persisted for up to 20 wk. A selective increase in the expression of pyruvate dehydrogenase kinase 4 and inhibition of pyruvate dehydrogenase are responsible for the rapid suppression of pyruvate utilization. An important consequence is that pyruvate dehydrogenase is sensitized to inhibition when mitochondria respire in the presence of fatty acids. Additionally, increased expression of pyruvate dehydrogenase kinase 4 preceded any observed diet-induced reductions in the levels of glucose transporter type 4 and glycolytic enzymes and, as judged by Akt phosphorylation, insulin signaling. Importantly, diminished insulin signaling evident at 1 wk on the high fat diet did not occur in pyruvate dehydrogenase kinase 4 knockout mice. Dietary intervention leads to a rapid decline in pyruvate dehydrogenase kinase 4 levels and recovery of pyruvate dehydrogenase activity indicating an additional form of regulation. Finally, an overnight fast elicits a metabolic response similar to that induced by high dietary fat obscuring diet-induced metabolic changes. Thus, our data indicate that diet-induced inhibition of pyruvate dehydrogenase may be an initiating event in decreased oxidation of glucose and increased reliance of the heart on fatty acids for energy production.

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