In vivo Inhibition of Monoamine Oxidase Studied with Radioactive Tyramine

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Abstract
Tyramine, labeled with C14 in the alpha-position of the side chain, was synthesized for use as a substrate in studies of the in vivo inhibition of monoamine oxidase. With the exception of a small degree of conjugation, no metabolic route for tyramine could be detected in intact rats and mice other than that due to monoamine oxidase action. A technique for evaluating in vivo inhibitory effect on monoamine oxidase was devised and a number of substances tested. Only 2 active compounds were found; the common sympathomimetic amines were inactive.