Identification ofN-(deoxyguanosin-8-yl)-4-azobiphenyl by32P-postlabeling analyses of DNA in human uroepithelial cells exposed to proximate metabolites of the environmental carcinogen 4-aminobiphenyl
作者:James F. Hatcher、Santhanam Swaminathan
DOI:10.1002/em.10079
日期:——
DNA adducts formed in human uroepithelial cells (HUC) following exposure to N-hydroxy-4-aminobiphenyl (N-OH-ABP), the proximate metabolite of the human bladder carcinogen 4-aminobiphenyl (ABP), were analyzed by the (32)P-postlabeling method. Two adducts detected by (32)P-postlabeling were previously identified as the 3',5'-bisphospho derivatives of N-(deoxyguanosin-8-yl)-4-aminobiphenyl (dG-C8-ABP)
通过(32)分析了暴露于N-羟基-4-氨基联苯(N-OH-ABP)(人膀胱致癌物4-氨基联苯(ABP)的最接近代谢产物)后人尿道上皮细胞(HUC)中形成的DNA加合物。 P后标记方法。通过(32)P后标记检测到的两个加合物先前被鉴定为N-(脱氧鸟苷-8-基)-4-氨基联苯(dG-C8-ABP)和N-(脱氧腺苷-的3',5'-双磷酸衍生物8-基)-4-氨基联苯(dA-C8-ABP)(Frederickson S等人,[1992]致癌作用13:955-961; Hatcher和Swaminathan [1995b]致癌作用16:295-301)。与被核酸酶P1 3'去磷酸化的dG-C8-ABP加合物相反,dA-C8-ABP对核酸酶P1具有抗性,因此提供了标记后的富集步骤。核酸酶P1消化后获得的后标记产品的二维薄层色谱的放射自显影显示了一些较小的加合物,本研究中已确定其中之一。N-乙酰氧基-4-