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  • Title: Evidence that binding of 7,12-dimethylbenz(a)anthracene to DNA in mouse embryo cell cultures results in extensive substitution of both adenine and guanine residues.
    Author: Dipple A, Pigott M, Moschel RC, Costantino N.
    Journal: Cancer Res; 1983 Sep; 43(9):4132-5. PubMed ID: 6409397.
    Abstract:
    Primary mouse embryo cell cultures were grown in the presence of [14C]guanine, labeling primarily deoxyguanosine residues in the cellular DNA, or in the presence of [14C]adenine, labeling both deoxyguanosine and deoxyadenosine residues in the cellular DNA. These cultures were subsequently exposed to 7,12-[3H]dimethylbenz(a)anthracene for 24 hr. The DNA was isolated and hydrolyzed to deoxyribonucleosides, and the 7,12-dimethylbenz(a)anthracene:deoxyribonucleoside adducts were separated chromatographically allowing the three major adducts found to be identified as bay-region anti-dihydrodiol-epoxide:deoxyguanosine and :deoxyadenosine adducts and a bay-region syn-dihydrodiol-epoxide:deoxyadenosine adduct. Therefore, in contrast to what is known for benzo(a)pyrene, substantial amounts of deoxyadenosine adducts are formed with the more potent carcinogen, 7,12-dimethylbenz(a)anthracene.
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