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- W1972182291 abstract "Intraperitoneal administration of 9-hydroxyellipticine, a specific cytochrome P-448 inhibitor, inhibited 3-methylcholanthrene-induced cytochrome P-448 activity (ethoxyresorufin O-deethylase, biphenyl 2-hydroxylase) and formation of the safrole carbene ligand complex with this cytochrome, but did not inhibit phenobarbital-induced cytochrome P-450 activity (ethyl-morphine N-demethylase) or formation of the safrole carbene ligand complex with this cytochrome. Biphenyl displaced the 9-hydroxyellipticine ligand from cytochrome P-448 leading to increased free cytochrome, but with no corresponding increase in mixed-function oxidase activity when biphenyl was used as substrate. It is concluded that following dissociation of the ligand complex, 9-hydroxyellipticine, which also exhibits type I binding, competes with biphenyl for the substrate binding site. Administration of 9-hydroxyellipticine to safrole-pretreated rats inhibited the cytochrome P-448-catalysed activity, but had no effect on the cytochrome P-450-catalysed activity. These results indicate that safrole induces a mixture of cytochromes P-450 and P-448 rather than a single novel haemo-protein. The type I substrate biphenyl displaced both the safrole carbene and the 9-hydroxyellipticine ligands from cytochrome P-448 resulting in increased free cytochrome. Displacement of the safrole carbene ligand was accompanied by increased mixed-function oxidase activity but, in contrast, displacement of the 9-hydroxyellipticine ligand resulted in no increase in mixed-function oxidase activity." @default.
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- W1972182291 date "1982-12-01" @default.
- W1972182291 modified "2023-10-14" @default.
- W1972182291 title "Selective inhibition of the safrole-induced mixed-function oxidase activities by 9-hydroxyellipticine" @default.
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- W1972182291 doi "https://doi.org/10.1016/0009-2797(82)90072-2" @default.
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