The control of brain tryptophan concentration
Acta Vitaminologica Et Enzymologica
|January 1, 1975
Summary
Linoleic acid increases brain uptake of tryptophan in rats by altering plasma levels. This highlights the crucial role of plasma free tryptophan in regulating brain tryptophan concentration for neurotransmitter synthesis.
Area of Science:
- Neuroscience
- Biochemistry
- Physiology
Background:
- Tryptophan is an essential amino acid precursor to serotonin, a key neurotransmitter.
- Brain tryptophan levels are influenced by plasma concentrations, but the precise mechanisms are complex.
Purpose of the Study:
- To investigate the effect of linoleic acid on tryptophan uptake by brain tissue.
- To determine the relationship between plasma free tryptophan and brain tryptophan concentration in vivo.
Main Methods:
- Incubation of rat brain slices with radioactive tryptophan.
- Addition of linoleic acid and competing amino acids to plasma.
- Measurement of midbrain tryptophan concentration in rats.
Main Results:
- Linoleic acid significantly increased radioactive tryptophan uptake in brain slices.
- Physiological concentrations of competing amino acids had minimal impact on uptake.
- Rat midbrain tryptophan concentration correlated significantly with plasma free tryptophan levels.
Conclusions:
- Plasma free tryptophan is a critical determinant of brain tryptophan concentration.
- Linoleic acid influences brain tryptophan availability, potentially impacting serotonin synthesis.
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