title: Effect of trichlorophenols on xenobiotic metabolism in the rat.
abstract: Unlike halogenated benzenes, trichlorophenols did not induce xenobiotic metabolism in the rat. 2,3,5-, 2,3,6-, 2,4,5-, and 2,4,6-Trichlorophenol at doses as high as 400 mg/kg p.o. daily for 14 days did not alter EPN detoxification. Only 2,4,5-trichlorophenol at the highest dose decreased microsomal NADPH-cytochrome c reductase activity and cytochrome P-450 content. In vitro, all 4 isomers inhibited EPN detoxification and the demethylation of p-nitroanisole. UDP-glucuronyltransferase was not altered in vivo and was only slightly inhibited in vitro by 2,3,5- and 2,4,5-trichlorophenol. The compounds were not hepatotoxic as assessed by measurement of hepatic glucose-6-phosphatase and serum sorbitol dehydrogenase.
mesh_terms: D000818:Animals; D001711:Biotransformation / Q000187:drug effects*; D002733:Chlorophenols / Q000494:pharmacology*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D066298:In Vitro Techniques; D007306:Insecticides / Q000378:metabolism*; D008099:Liver / Q000187:drug effects; D008297:Male; D009251:NADPH-Ferrihemoprotein Reductase / Q000378:metabolism; D009575:Nitroanisole O-Demethylase / Q000378:metabolism; D004849:Phenylphosphonothioic Acid, 2-Ethyl 2-(4-Nitrophenyl) Ester / Q000378:metabolism*; D051381:Rats
chemical_list: D002733:Chlorophenols; D007306:Insecticides; D004849:Phenylphosphonothioic Acid, 2-Ethyl 2-(4-Nitrophenyl) Ester; D003577:Cytochrome P-450 Enzyme System; D009575:Nitroanisole O-Demethylase; D009251:NADPH-Ferrihemoprotein Reductase