Abstract
Metabolic activation of the benzene metabolites, catechol, hydroquinone, and phenol, by rat-liver microsomes and an NADPH-generating system (S9 mix) caused an increased induction of sister-chromatid exchanges (SCEs) in cultured human lymphocytes. There were different optimal concentrations of S9 mix for converting each benzene metabolite into further reactive forms that could induce SCE-forming lesions. The data indicate that catechol and hydroquinone can be optimally metabolized to produce reactive species, presumably benzo(semi)quinones, under conditions of lower metabolic activity than those necessary for phenol and benzene.
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