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Butylated hydroxyanisole (BHA) pretreatment of male rats has been examined for its effect on in vivo and in vitro hepatic aflatoxin B1-DNA binding (AFB1-DNA) in these animals. No difference either in cytochrome P-450 content or microsome-mediated AFB1-DNA was observed between livers from control and treated rats. However, cytosols from treated animals showed severalfold more inhibition of microsome mediated AFB1 binding to either exogenous or endogenous DNA than cytosols from controls. Presence of 1 mM level of either trichloropropene oxide or styrene oxide partially reversed the cytosolic inhibition of binding. Intraperitoneal administration of AFB1 2h before killing produced 50% less AFB1 binding to nuclear DNA in treated than in control animals. The role of induced glutathione S-transferases in treated rats in modulating hepatic AFB1-DNA binding is discussed.
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