Dietary precursors and brain neurotransmitter formation

Annual Review of Medicine
J D Fernstrom

Abstract

The rates of synthesis of serotonin, acetylcholine, and, under certain circumstances, dopamine and norepinephrine by brain neurons depend considerably on the availability to brain of the respective dietary precursors. This precursor dependence seems to be related to the fact that the enzyme catalyzing the rate-limiting step in the synthetic pathway for each transmitter is unsaturated with substrate at normal brain concentrations. Moreover, brain levels of the individual precursors rise following oral or parenteral administration of the pure compound or the ingestion of certain foods. Precursor-induced increases in brain transmitter formation seem to influence a variety of brain functions and behaviors, which suggests that transmitter release has been enhanced. It now appears that these precursors may become useful as therapeutic agents for the treatment of selected disease states, wherein the disease is related to reduced release of transmitter. Examples of Parkinson's disease (tyrosine), myasthenia gravis (choline or phosphatidylcholine), depression (tyrosine), and possibly abnormal appetite (tryptophan). Perhaps the future will bring the identification of still other neurotransmitters, whose rates of synthesis depend on precu...Continue Reading

Citations

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