Abstract
A bulky DNA adduct (Spot 1) was previously detected in normal adjacent breast tissues of 41% (36/87) of women with breast cancer and in none (0/29) of the noncancer controls by (32)P-postlabeling. To characterize this adduct, it was chromatographically compared with DNA adduct profiles generated in several in vitro and in vivo experimental systems. First, MCF-7 cells were exposed to a number of chemical carcinogens, that is, benzo[a]pyrene (B[a]P), 4-OH-B[a]P, 9-OH-B[a]P, 11-OH-B[a]P, B[a]P-trans-4,5-dihydrodiol, 1-nitropyrene, 6-nitrochrysene, dibenzo[a,l]pyrene, benzo[c]phenanthrene, dibenzo[a,h]anthracene, 3-methylcholanthrene, and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine. Spot 1 was detected as a minor adduct in cells treated with B[a]P but not other compounds. Second, to determine whether Spot 1 is derived from lipid peroxidation products or estrogen metabolites, it was compared with adduct profiles of cells or DNAs exposed to 17beta-estradiol, 4-hydroxy estradiol, 4-hydroxynonenal, or oxidized oat oil. Spot 1 was not detectable in these samples. In addition, Spot 1 did not comigrate with the 1,N(2)-ethenodeoxyguanosine adduct standard. Third, to explore the mechanism of Spot 1 formation, it was compared with adduct...Continue Reading
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