Abstract
The ability of anthraflavic acid to inhibit the mutagenicity of IQ was investigated using the Ames test and employing hepatic activation systems from Aroclor 1254-pretreated rats. Incorporation of anthraflavic acid into the S9 mix caused a concentration-dependent decrease in the mutagenicity of IQ. A similar effect was seen when microsomes only were employed as activation systems. Cytosol, as we have previously demonstrated, potentiated the microsome-mediated mutagenicity of IQ and this potentiation was also inhibited by anthraflavic acid. In contrast, anthraflavic acid had no effect on the mutagenicity of the direct-acting microsome-generated metabolites of IQ. It is concluded that anthraflavic acid is a potent inhibitor of IQ mutagenicity by virtue of its ability to inhibit both its microsomal and cytosolic activation pathways.
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