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- W1582562177 abstract "N-Acetyl, 4-O-methyldopa was identified as a major urinary metabolite of L-4-O-methyldopa, both in man and in the rat. The urinary metabolites were examined in man after oral and in rat after intraperitoneal administration of L-4-O-methyldopa, L-3-O-methyldopa, L-dopa and N-acetyl, 4-O-methyldopa. 4-Mdopa was found to be converted mainly to N-acetyl, 4-Mdopa and iso-HVA and very little to the corresponding pyruvic and lactic acids, whereas 3-Mdopa was metabolized to its pyruvic, lactic and acetic (HVA) derivatives and practically not acetylated. It is suggested therefore that the 3-hydroxy,4-methoxy group (the iso-vanyl structure) prevents transamination and that N-acetylation represents an alternative metabolic pathway. The lack of N-acetyl,4-O-methyldopa after the L-dopa loads shows that L-dopa is not 4-O-methylated and therefore that 4-O-methyldopa is not, or only in a minute amount if any, an in vivo metabolite of L-dopa. N-Acetyl,4-Mdopa administration to rats resulted in excretion of the compound almost unchanged. These results agree with a previous suggestion by the authors of partly distinct metabolic routes for the O-methyl catecholamines according to whether the methyl group is bound on the meta or on the para position and raises the question as to what extent iso-HVA levels in body fluids are representative of a para-O-methylation of dopamine, implicated in neuropsychiatric disorders." @default.
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- W1582562177 date "1976-03-01" @default.
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- W1582562177 title "N-acetyl, 4-O-methyldopa, a major metabolite of L-4-O-methyldopa in man and rat" @default.
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- W1582562177 doi "https://doi.org/10.1016/0006-2952(76)90376-2" @default.
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