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The effect of loading doses of unlabeled methionine on the oxidative catabolism of 14C-labeled histidine and serine in vivo.

A significant effect of loading doses of unlabeled L-methionine resulting in decreased 14CO2 production in the breath of normal rats after the intravenous administration of L-histidine-(imidazofe-2-14C) and L-serine-3-14C was demonstrated in vivo. These results suggest that L-methionine inhibited the physical transport of several amino acids across the cell membrane in normal rats. The 14CO2 breath analysis using an ionization chamber method offers great promise for in vivo metabolic studies involving competition between various substrates in the animal.