title: Effect of methyltestosterone administration on microsomal drug metabolism in aging rats.
abstract: The effects of methyltestosterone administration (100 mg/kg for four days) on the hepatic microsomal drug-metabolizing system from old male rats was investigated. Age-related decreases in cytochrome P-450 content, cytochrome c reductase activity and benzphetamine N-demethylase activity were unaffected by methyltestosterone treatment. Administration of the androgen induced nitroanisole O-demethylase and aniline hydroxylase activities, resulting in a restoration of the latter to levels found in young-adult animals.
mesh_terms: D000375:Aging; D000815:Aniline Hydroxylase / Q000096:biosynthesis / Q000378:metabolism; D000818:Animals; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis / Q000378:metabolism; D004790:Enzyme Induction; D008658:Inactivation, Metabolic; D008297:Male; D008777:Methyltestosterone / Q000494:pharmacology*; D008862:Microsomes, Liver / Q000201:enzymology*; D009245:NADH Dehydrogenase / Q000096:biosynthesis / Q000378:metabolism; D009251:NADPH-Ferrihemoprotein Reductase / Q000096:biosynthesis / Q000378:metabolism; D010089:Oxidoreductases, N-Demethylating / Q000096:biosynthesis / Q000378:metabolism; D010090:Oxidoreductases, O-Demethylating / Q000096:biosynthesis / Q000378:metabolism; D051381:Rats; D011916:Rats, Inbred F344
chemical_list: D003577:Cytochrome P-450 Enzyme System; C026048:4-nitroanisole O-demethylase; D010090:Oxidoreductases, O-Demethylating; D000815:Aniline Hydroxylase; C019781:benzphetamine N-demethylase; D010089:Oxidoreductases, N-Demethylating; D009251:NADPH-Ferrihemoprotein Reductase; D009245:NADH Dehydrogenase; D008777:Methyltestosterone