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- W2041692024 abstract "We studied the metabolism of methyl-n-butyl-nitrosamine (MBN), a carcinogen for the rat esophagus and liver. The 2-, 3- and 4-hydroxy derivatives were identified as new metabolites of MBN. In studies on tissue slices freshly removed from MRC-Wistar rats, MBN metabolism resembled that of the previously studied methyl-amylnitrosamine in the esophagus catalyzed 2- and 3- hydroxylation; liver, omega-1 hydroxylation; and lung, omega-hydroxylation of both nitrosamines. Liver microsomes from Sprague-Dawley rats catalyzed 2-, 3- and 4-hydroxylation of MBN, as well as the previously studied activating reactions of demethylation and debutylation. Phenobarbital induced all five reactions of MBN bh rat liver microsomes, especially debutylation; 3-methylhol-anthrene induced 3-hydroxylation and debutylation and isoniazid induced demethylation and debutylation. Monoclonal antibodies that inhibit specific cytochrome P-450 isozymes were used to identify the isozymes involved in each reaction. Antibody 4-7-1 appeared more specific than the previously used antibody 2-66-3 for inhibiting P-450 2B1 and/or 2B2. For the metabolism of both MBN and methylamylnitrosamine by rat liver microsomes, the antibody results indicated that P-450 2C11 mainly catalyzed demethylation and omega-1 hydroxylation, P-450 1A1 or 1A2 catalyzed 3-hydroxylation and debutylation or depentylation, P-450 2E1 produced demethylation and P-450 2B1 or 2B2 produced omega-1 hydroxylation, demethylation and debutylation or depentylation." @default.
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- W2041692024 date "1993-04-30" @default.
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- W2041692024 title "Hydroxylation and dealkylation of methyl-n-butylnitrosamine and role of certain cytochrome P-450 isozymes in these reactions." @default.
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- W2041692024 doi "https://doi.org/10.1016/0304-3835(93)90162-3" @default.
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