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In vivo DNA adduct formation by bisphenol A
Author(s) -
Atkinson Alfonza,
Roy Deodutta
Publication year - 1995
Publication title -
environmental and molecular mutagenesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1
H-Index - 87
eISSN - 1098-2280
pISSN - 0893-6692
DOI - 10.1002/em.2850260109
Subject(s) - chemistry , adduct , dna , microsome , in vivo , dna adduct , carcinogen , biochemistry , metabolite , dna damage , deoxyguanosine , in vitro , organic chemistry , biology , microbiology and biotechnology
We have previously shown that bisphenol A (BPA) is oxidized to bisphenol‐o‐quinone in the presence of activation system and that the chemical reaction of DNA or deoxyguanosine 3′‐monophosphate (dGMP) with bisphenol‐o‐quinone produces adducts. In the present study, using the 32 P‐postlabeling technique, we have investigated the in vivo DNA adduct formation by BPA by examining covalent modification in DNA. Administration of a single or multiple dose of 200 mg/kg of BPA to CD1 male rats produced two major and several minor adducts in liver DNA. The two major in vivo adducts matched the adduct profile of DNA or dGMP‐bis‐phenol‐o‐quinone. To determine how BPA may be converted to DNA‐binding metabolites, adducts were examined after incubation of DNA with BPA in the presence of a microsomal activation system. The in vitro incubation of BPA with DNA in the presence of a microsomal activation system revealed one major adduct and several minor adducts. The formation of adducts in DNA by BPA in the presence of a microsomal activation system was drastically decreased by known inhibitors of cytochrome P450. Adduct formation in DNA when cumene hydroperoxide or NADPH was used as a cofactor showed adducts with similar chromatographic mobilities as those from the reaction of dGMP‐bisphenol‐o‐quinone. These data demonstrate that BPA is capable of binding covalently to DNA. DNA binding can be inhibited by the inhibitors of cytochrome P450. One of the DNA‐binding metabolite(s) both in vitro and in vivo may be bisphenol‐o‐quinone. Covalent modifications in DNA by in vivo exposure of BPA may be a factor in the induction of hepatotoxicity. © 1995 Wiley‐Liss, Inc.