Diphasic action of the aliphatic amide, HOE 17879, on hepatic microsomal drug metabolizing enzymes in the mouse

Effects of ammonium metavanadate on rat liver enzymes

Five min after administration of a single, i.p. dose of ammonium metavanadate (5 mg/kg), in rats, liver enzyme activities were measured. Microsomal mixed-function oxidases (except for aminopyrine N-demethylase), glucose-6-phosphatase and alkaline phosphatase were inhibited but lactate, malate, and glycerophosphate dehydrogenases as well as microsomal NADPH2-dependent cytochrome c reductase were unchanged.

Interaction of organic dyes with hepatic microsomal drug-metabolizing monoöxygenases in vitro

Organic dyes such as malachite green, methylene blue, fuchsin, safranine T, neutral red, phenazine methosulphate, riboflavin, dichlorophenolindophenol, phenolphthalein, and fluorescein, inhibit hepatic microsomal mixed-function oxidases and, partly, enhance, partly, inhibit hepatic microsomal NADPH-dependent cytochrome c and neotetrazolium reductases, in contrast to other inhibitors of drug metabolism which do not affect cytochrome c reductase but only interact with cytochrome P-450.

Studies on liver toxicants: influence of bromobenzene on hepatic microsomal enzymes in mice

The effect of acute bromobenzene intoxication on drug-metabolizing liver enzymes was studied. After an oral dose of 3000 mg/kg body weight of bromobenzene, the glucuronyltransferases I and II were increased, indicating an enzyme activation by this organic solvent via membrane irritation. The mixed-function oxidases were inhibited with the exception of the ketamine N-demethylase. Microsomal lipoperoxidation was reduced whilst H2O2 formation was unchanged.

Inhibition of uridinediphosphate glucuronyltransferase caused by furosemide

The diuretic agent, furosemide, inhibits liver microsomal uridinediphosphate glucuronyltransferase (EC. 2.4.1.17), in monkey and rat. Inhibition is of the non-competitive type.

Studies on liver toxicants. Influence of bromobenzene on hepatic microsomal enzymes in rats

In acute oral studies, the effect of bromobenzene on hepatic microsomal enzymes was investigated. Neither glucuronyltransferases nor cytochrome c reductase showed significant changes. Most of the mixed-function oxidases studied were inhibited with the exception of ketamine-N-demethylase. The data indicate that bromobenzene or its epoxide acts on cytochrome P-450 but not on all cytochrome P-450 species, and does not affect the reductase and the glucuronyltransferases. Microsomal lipoperoxidation and microsomal H2O2 formation were increased.

Induction of microsomal drug-metabolizing enzymes caused by hexobarbital

Hexobarbital was given to anaesthetized mice for a period of 7 h by repeated i. p. injection, first of 100 mg/kg,then several times of 50 mg/kg. A high level of hexobarbital was maintained in the liver. The activity of microsomal drug-metabolizing enzymes was induced by this treatment with hexobarbital. 30 min after a single i. p. injection of 100 mg/kg of hexobarbital, there was a significant inhibition of aminopyrine N-demethylase but none of cytochrome c and neotetrazolium reductases. Hexobarbital in vitro inhibits aminopyrine N-demethylase but not cytochrome c reductase.