Abstract
Hepatic microsomes were prepared from immature C57BL/6J mice 24 h after receiving intraperitoneal injections of either corn oil, benzo[ e]pyrene (BeP, 50 mg/kg) or 2,3,7,8- tetrachlorodibenzo- p-dioxin (TCDD, 4 × 10 −3mg/kg). The capacity of these hepatic microsomes to bioactivate aflatoxin b 1 (AFB 1), 2-aminoanthracene (AA), benzo[ a]pyrene (BaP), 3-methylcholanthrene (MC), 7,12-dimethylbenzanthracene (DMBA), BeP and pyrene (PY) was measured using strain TA 100 in the Salmonella typhimurium/ microsome reversion assay. BeP pretreatment of mice resulted in a 33% increase in mutagenic potency (MP) of AFB 1 over the corn oil controls and a 70% increase in MP relative to TCDD-pretreated microsomes. With AA, BaP and DMBA as promutagens, BeP pretreatment reduced MP an average of 24%, while TCDD pretreatment increased MP of these 3 promutagens 263% compared to controls. Since the general effects of BeP and TCDD on murine hepatic cytochrome P-450 (P450)-mediated activities in this study were discordant, it appears that changes in P450 activity by BeP pretreatment are not mediated through the Ah receptor.
Published Version
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