title: DNA binding and adduct formation of 7,12-dimethylbenz[a]-anthracene by rat mammary epithelial cell aggregates in vitro.
abstract: Freshly isolated mammary epithelial cell aggregates from female Sprague-Dawley rats metabolized 7,12-dimethylbenz-[a]anthracene (DMBA) to bay-region anti- and syn-dihydrodiolepoxides that bound to deoxyguanosine and deoxyadenosine residues in cellular DNA. After 24 h of incubation 68% of the DMBA (0.4 micrograms/ml) was metabolized and 58% of the extracellular metabolites were water-soluble. DMBA-DNA binding increased rapidly during the initial 24 h of incubation. Formation of the bay-region syn-dihydrodiolepoxide:deoxyadenosine adduct increased linearly throughout the 24 h, whereas formation of deoxyadenosine and deoxyguanosine adducts with the bay-region anti-dihydrodiolepoxide increased rapidly following a delay of 12 h.
authors.forename: K W
authors.initials: KW
authors.lastname: Singletary
authors.forename: J A
authors.initials: JA
authors.lastname: Milner
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene / Q000378:metabolism*; D000818:Animals; D002449:Cell Aggregation; D004247:DNA / Q000378:metabolism*; D004847:Epithelial Cells; D004848:Epithelium / Q000378:metabolism; D005260:Female; D007700:Kinetics; D008321:Mammary Glands, Animal / Q000166:cytology / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D014316:Tritium
chemical_list: D014316:Tritium; D015127:9,10-Dimethyl-1,2-benzanthracene; D004247:DNA