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Acute tryptophan depletion increases experimental nausea but also induces hunger in healthy female subjects.

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BACKGROUND Acute tryptophan depletion (ATD) is an experimental model to reduce central serotonin levels. METHODS Thirty-eight healthy female subjects were randomly assigned to two groups (ATD and control) in a randomized, double-blinded parallel-group design. Following a standardized and balanced

Tryptophan depletion increases nausea, headache and photophobia in migraine sufferers.

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Sensitivity to light was investigated 5 and 8 h after consumption of an amino acid drink which contained L-tryptophan (balanced amino acid condition: 19 controls and 22 migraine sufferers) or which produced a short-term reduction in brain serotonin synthesis by omitting L-tryptophan (tryptophan

Plasma tryptophan and anorexia in human cancer.

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A correlation between anorexia and brain levels of serotonin and tryptophan (TRP) has been reported in tumor-bearing animals. In the present investigation 45 patients with various types of cancer and 13 control subjects were studied. Prior to the study the patients had received no antineoplastic

Effects and side effects associated with the non-nutritional use of tryptophan by humans.

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The daily nutritional requirement for L-tryptophan (Trp) is modest (5 mg/kg). However, many adults choose to consume much more, up to 4-5 g/d (60-70 mg/kg), typically to improve mood or sleep. Ingesting L-Trp raises brain tryptophan levels and stimulates its conversion to serotonin in neurons, which

Alteration of human pain thresholds by nutritional manipulation and L-tryptophan supplementation.

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Pain perception and tolerance thresholds of 30 normal subjects were determined by electrical stimulation of dental pulps before and after dietary manipulation which included either tryptophan supplementation or placebo. Perception threshold levels were similar in tryptophan and placebo subjects;

The acute effects of oral (--)-tryptophan in human subjects.

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1 The psychotropic effects of a single oral dose of (--)-tryptophan (5 g) in human volunteers were investigated using a series of physiological and psychological tests. 2 Self-ratings of mood showed increase in drowsiness but no euphoria was detected. 3 Severe initial nausea occurred and headache

Effects of tranylcypromine treatment on neuroendocrine, behavioral, and autonomic responses to tryptophan in depressed patients.

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Effects of intravenous administration of the serotonin precursor tryptophan (TRP) on serum prolactin, neuromotor function, subjective mood, and blood pressure and pulse were determined in nine depressed patients before and during placebo-controlled treatment with the monoamine oxidase inhibitor

Comparison of the effects of amino acid mixture and placebo on plasma tryptophan to large neutral amino acid ratio.

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To assess the possible role of altered central serotonin function in psychiatric disorders, investigators have utilized pharmacological challenge testing with an amino acid mixture to decrease blood tryptophan concentration and, indirectly, brain serotonin levels. The aim of this pilot study was to

Effect of tryptophan depletion on symptoms of motion sickness in migraineurs.

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Seven hours after 39 migraineurs and 37 controls consumed an amino acid drink that contained or omitted l-tryptophan (thereby reducing brain serotonin synthesis), motion sickness was provoked by the visual illusion of movement. Tryptophan depletion boosted dizziness, nausea, and the illusion of

Effects of acute tryptophan depletion on brain serotonin function and concentrations of dopamine and norepinephrine in C57BL/6J and BALB/cJ mice.

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Acute tryptophan depletion (ATD) is a method of lowering brain serotonin (5-HT). Administration of large neutral amino acids (LNAA) limits the transport of endogenous tryptophan (TRP) across the blood brain barrier by competition with other LNAAs and subsequently decreases serotonergic

Influence of acute tryptophan depletion on gastric sensorimotor function in humans.

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Peripheral serotonin (5-hydrodytryptamine; 5-HT) is involved in the regulation of gastrointestinal motility and sensation, whereas centrally it plays a role in mood regulation. A dysfunctional serotonergic system may provide a plausible link between functional dyspepsia symptoms and its high

Acute tryptophan depletion in accordance with body weight: influx of amino acids across the blood-brain barrier.

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Acute tryptophan depletion (ATD) is a method of reducing central nervous serotonin (5-HT) synthesis in humans by administering an amino acid (AA) beverage lacking in tryptophan (TRP), the physiological precursor of 5-HT. However, to date, the use of conventional ATD protocols in children and

Protective role of N-acetyl-l-tryptophan against hepatic ischemia-reperfusion injury via the RIP2/caspase-1/IL-1β signaling pathway.

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Context: Hepatic ischemia-reperfusion injury (HIRI) is a complex process observed during liver resection and transplantation. N-acetyl-l-tryptophan (l-NAT), an antagonist of neurokinin 1 receptor, has been used for the treatment of nausea and neurodegenerative diseases.

Oral tryptophan challenge studies in cirrhotic patients: no evidence of neuropsychiatric changes.

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Hepatic encephalopathy is a frequent complication of cirrhosis. Abnormalities of 5-hydroxytryptamine (5-HT) and its metabolites are recognized and may contribute to its pathogenesis. We therefore studied the effect of an oral tryptophan load (6-18 g) upon psychometric test scores and analyzed EEG's

Phase I study of vintriptol, a tryptophan ester of vinblastine.

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Vintriptol, a tryptophan ester of vinblastine, is a new vinca alkaloid derivative. Preclinical studies have demonstrated its antitumour activity in a large variety of animal models. In this phase I study, 47 patients with advanced cancer were exposed to escalating doses of vintriptol, starting at 6

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