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- W2132022246 abstract "Dietary tyramine is associated with hypertensive crises because of its ability to induce the release of catecholamines. The roles of monoamine oxidase (MAO); flavin-containing monooxygenase (FMO); and cytochrome P450 2D6 (CYP2D6) were studied in terms of the enzymatic elimination of tyramine in vitro at a substrate concentration of 1.0 µM; which is relevant to in vivo serum concentrations. Tyramine elimination by human liver supernatant fractions was decreased by ˜70% in the absence of NADPH. Pargyline; an MAO inhibitor; decreased tyramine elimination rates by ˜30%. Among recombinant P450 and FMO enzymes; CYP2D6 had a high activity in terms of tyramine elimination. Tyramine elimination rates were inhibited by quinidine and significantly correlated with bufuralol 1'-hydroxylation activities (a CYP2D6 marker). Liver microsomes genotyped for CYP2D6*10/*10 and CYP2D6*4/*4 showed low and undetectable activities; respectively; compared with the wild-type CYP2D6*1/*1. The present results suggest that tyramine is eliminated mainly by polymorphic CYP2D6. Tyramine toxicity resulting from differences in individual metabolic elimination is thus genetically determined." @default.
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- W2132022246 date "2011-08-01" @default.
- W2132022246 modified "2023-09-27" @default.
- W2132022246 title "Human Liver Enzymes Responsible for Metabolic Elimination of Tyramine, a Vasopressor Agent from Daily Food" @default.
- W2132022246 doi "https://doi.org/10.2174/187231211796905026" @default.
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