Abstract
Incubation of the o-phenylphenol (OPP) metabolites, o-phenylhydroquinone (PHQ) and o-phenylbenzoquinone (PBQ) with V 79 Chinese hamster cells led to a significant enhancement of the amount of 8-hydroxy-2'-deoxyguanosine (8-OH-dG) in nuclear DNA. With OPP no distinct induction of this lesion could be observed. In addition, PHQ and PBQ were able to generate DNA single-strand breaks (DNA SSB), while OPP failed to induce this lesion. All incubations were performed for 1 h without exogenous metabolic activations and the lowest effective concentration tested was 20 microM. It is concluded that these metabolites may contribute to the carcinogenicity of OPP and sodium o-phenylphenolate (SOPP) observed in rats, by generating reactive oxygen species (ROS) through their redox cycling properties.
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