Benzo[c]phenanthrene-DNA adducts in mouse epidermis in relation to the tumorigenicities of four configurationally isomeric 3,4-dihydrodiol 1,2-epoxides

被引:27
作者
Agarwal, R [1 ]
Canella, KA [1 ]
Yagi, H [1 ]
Jerina, DM [1 ]
Dipple, A [1 ]
机构
[1] NIDDKD, NIH, BIOORGAN CHEM LAB, BETHESDA, MD 20892 USA
关键词
D O I
10.1021/tx950148+
中图分类号
R914 [药物化学];
学科分类号
100701 ;
摘要
P-32-Postlabeling assays were used to monitor the binding to epidermal DNA that resulted from the application of each of the four configurational isomers of benzo[c]phenanthrene 3,4-dihydrodiol 1,2-epoxide to mouse skin in vivo. For three of these configurational isomers, there was a reasonable correlation between the relative level of binding to epidermal DNA and the known tumorigenic effects of these compounds. However, for the 4(S),3(R)-dihydrodiol a(S),1(R)-epoxide, the tumorigenic response was considerably greater in relation to the level of DNA modification than was the case for the other isomers. This greater tumorigenic response was consistent with previous observations indicating that this isomer was more mutagenic, at equivalent levels of DNA modification, than the other two tumorigenic dihydrodiol epoxides. Additionally, the 4(S),3(R)-dihydrodiol 2(S),1(R);epoxide reacts with DNA to generate predominantly (similar to 80%) adducts on the amino group of adenine residues. These findings might imply a greater intrinsic biological effect of such adenine adducts with respect to the other major adduct formed on the amino group of guanine residues.
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页码:586 / 592
页数:7
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