Tele-Methylhistamine is a specific MAO B substrate in man.
Tele-methylhistamine, the first metabolite of histamine in tissues which lack diamine oxidase, is shown to be a substrate for human MAO B. Human liver homogenates were incubated with 3H-tele-methylhistamine and the products separated using thin-layer chromatography. The major product was 3-methylimidazoleacetic acid, the oxidatively deaminated metabolite of tele-methylhistamine. The reaction was inhibited by low concentrations of (-)deprenyl, the specific MAO B inhibitor. Tele-methylhistamine was also found to inhibit competitively the oxidation of phenylethlamine, but not that of 5-hydroxytryptamine, providing further evidence that it is oxidized by MAO B itself and not a related enzyme. This finding implies that (-)deprenyl and other MAO inhibitors used clinically may interfere with histamine metabolism.[1]References
- Tele-Methylhistamine is a specific MAO B substrate in man. Elsworth, J.D., Glover, V., Sandler, M. Psychopharmacology (Berl.) (1980) [Pubmed]
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