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“Thus, for example, brain levels of tryptophan, tyrosine, or choline can control the rates at which neurons synthesize serotonin, dopamine , or acetylcholine, respectively.”
Metabolism: clinical and experimental • 2008 | View Paper
“…,choline inhibits the influx of dopamine with an IC50 value of 17 microM and stimulates the efflux of dopamine with a K(m) value of 8.20 microM. These results strongly suggest that dopamine is transported by the choline exchanger previously reported to be present in red blood cells.”
“Compared with control animals, rats administered total parenteral nutrition plus choline for 5 days showed a decrease of approximately 5- and 2-fold in urinary dopamine and norepinephrine concentration, respectively.”