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• W2103729829 abstract "The oxidation of uroporphyrinogen, an intermediate of the heme biosynthetic pathway, by methylcholanthrene-inducible isozymes(s) of cytochrome P-450 has been proposed to play a role in the development of chemically induced uroporphyria. Prior work from this laboratory indicated that although addition of 3,4,3',4'-tetrachlorobiphenyl is required for uroporphyrinogen oxidation by methylcholanthrene-induced chick embryo liver microsomes, this biphenyl is not required for the oxidation catalyzed by hepatic microsomes from methylcholanthrene-induced rodents. Here we investigated whether rodent microsomes catalyze uroporphyrinogen oxidation without addition of 3,4,3',4'-tetrachlorobiphenyl because the chemical used as an inducer remains bound to cytochrome P-450. Hepatic microsomes containing almost no residual inducer were isolated from rats treated with a low dose of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). These microsomes oxidized uroporphyrinogen at high rates without addition of 3,4,3',4'-tetrachlorobiphenyl. Inducer-free microsomal cytochrome P-450 was also obtained by inducing cytochrome P-450 in rats and mice with isosafrole, which was then removed from the isolated microsomes by butanol treatment. This procedure resulted in microsomes with high activity for uroporphyrinogen oxidation. Furthermore, addition of chlorobiphenyl to these inducer-free microsomes was inhibitory. Hepatic microsomes from isosafrole-induced C57BL/6 and DBA mice, rendered inducer-free by butanol treatment, oxidized uroporphyrinogen at the same rate even though these two strains differ markedly in their susceptibility to chemically induced uroporphyria. We conclude that uroporphyrinogen oxidation is catalyzed by cytochrome P-450 that is free of inducer." @default.
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• W2103729829 date "1990-01-01" @default.
• W2103729829 modified "2023-09-27" @default.
• W2103729829 title "Role of inducer binding in cytochrome P-450 IA2-mediated uroporphyrinogen oxidation" @default.
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• W2103729829 doi "https://doi.org/10.1002/jbt.2570050310" @default.
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