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Related Experiment Videos

Decrease in plasma tryptophan after tryptophan-free amino acid mixtures in man.

E A Moja1, D M Stoff, G L Gessa

  • 1Chair of Psychobiology, Medical School, University of Modena, Italy.

Life Sciences
|January 1, 1988
PubMed
Summary
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Ingesting essential amino acids, excluding tryptophan, rapidly lowers plasma tryptophan levels in healthy males. This effect is dose-dependent and sustained for at least six hours.

Area of Science:

  • Biochemistry
  • Human Nutrition
  • Metabolic Studies

Background:

  • Tryptophan is an essential amino acid crucial for protein synthesis and neurotransmitter production.
  • Competition for transport across the blood-brain barrier can influence brain amino acid levels.

Purpose of the Study:

  • To investigate the effect of ingesting a mixture of essential amino acids (lacking tryptophan) on plasma tryptophan levels.
  • To determine the dose-response relationship between amino acid intake and plasma tryptophan reduction.

Main Methods:

  • Healthy male subjects fasted for 12 hours.
  • Subjects ingested increasing doses of a specific essential amino acid mixture (lacking tryptophan).
  • Plasma tryptophan levels were monitored over time.

Related Experiment Videos

Main Results:

  • Ingestion of the amino acid mixture caused a rapid and dose-dependent decrease in plasma tryptophan.
  • Following the highest dose (36.6 g), plasma tryptophan decreased to approximately 35% of baseline levels.
  • Significantly reduced plasma tryptophan levels persisted for at least 6 hours post-ingestion.

Conclusions:

  • High doses of essential amino acids, when lacking tryptophan, can significantly deplete plasma tryptophan concentrations.
  • The observed decrease in plasma tryptophan may have implications for neurotransmitter synthesis and warrants further clinical investigation.