Title : [Correlation between cytochrome P-448 content and benzopyrene hydroxylase activity during the induction of microsomal monooxygenases using methylcholanthrene-type xenobiotics].

Pub. Date : 1984 Mar

PMID : 6326866






5 Functional Relationships(s)
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1 Using antibodies against electrophoretically homogeneous cytochrome P-448 from rat liver microsomes induced by 3-methylcholanthrene, the changes in the immunologic identity and contents by cytochrome P-448 induced by 3-methylcholanthrene, 3.4-benzpyrene and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), were studied. Benzo(a)pyrene cytochrome P450, family 1, subfamily a, polypeptide 2 Rattus norvegicus
2 On the other hand, 3-methylcholanthrene, 3,4-benzpyrene and TCDD significantly and equally activates the cytochrome P-448-dependent benzpyrene hydroxylase, since the antibodies against cytochrome P-448 inhibit benzpyrene metabolism in the microsomes by 85-90%. Benzo(a)pyrene cytochrome P450, family 1, subfamily a, polypeptide 2 Rattus norvegicus
3 On the other hand, 3-methylcholanthrene, 3,4-benzpyrene and TCDD significantly and equally activates the cytochrome P-448-dependent benzpyrene hydroxylase, since the antibodies against cytochrome P-448 inhibit benzpyrene metabolism in the microsomes by 85-90%. Benzo(a)pyrene cytochrome P450, family 1, subfamily a, polypeptide 2 Rattus norvegicus
4 The possible reasons for the TCDD-induced increase in the catalytic activity of cytochrome P-448 as compared to the immunologically identical cytochrome P-448 induced by 3-methylcholanthrene and 3,4-benzpyrene, are discussed. Benzo(a)pyrene cytochrome P450, family 1, subfamily a, polypeptide 2 Rattus norvegicus
5 The possible reasons for the TCDD-induced increase in the catalytic activity of cytochrome P-448 as compared to the immunologically identical cytochrome P-448 induced by 3-methylcholanthrene and 3,4-benzpyrene, are discussed. Benzo(a)pyrene cytochrome P450, family 1, subfamily a, polypeptide 2 Rattus norvegicus