Expanded Analysis of Benzo[<i>a</i>]pyrene−DNA Adducts Formed in Vitro and in Mouse Skin: Their Significance in Tumor Initiation
作者:Liang Chen、Prabu D. Devanesan、Sheila Higginbotham、Freek Ariese、Ryszard Jankowiak、Gerry J. Small、Eleanor G. Rogan、Ercole L. Cavalieri
DOI:10.1021/tx960004a
日期:1996.1.1
expanded analyses of benzo[a]pyrene (BP)-DNA adducts formed in vitro by activation with horseradish peroxidase (HRP) or 3-methylcholanthrene-induced rat liver microsomes and in vivo in mouse skin. The adducts formed by BP are compared to those formed by BP-7,8-dihydrodiol and anti-BP diol epoxide (BPDE). First, activation of BP by HRP produced 61% depurinating adducts: 7-(benzo[a]pyrene-6-yl)guanine
本文报道了通过辣根过氧化物酶(HRP)或3-甲基胆固醇诱导的大鼠肝微粒体激活而在体外形成的苯并[a] py(BP)-DNA加合物的扩展分析,以及在小鼠皮肤中的体内分析。将由BP形成的加合物与由BP-7,8-二氢二醇和抗BP二醇环氧化合物(BPDE)形成的加合物进行比较。首先,HRP激活BP产生了61%的脱嘌呤加合物:7-(苯并[a] py-6-基)鸟嘌呤(BP-6-N7Gua),BP-6-C8Gua,BP-6-N7Ade和新经鉴定为BP-6-N3Ade。作为标准,最后的加合物与BP-6-N1Ade一起在腺嘌呤存在下通过BP的电化学氧化合成。其次,通过微粒体激活BP形成的BP-DNA加合物的鉴定和定量显示了68%的脱嘌呤加合物:BP-6-N7Ade,BP-6-N7Gua,BP-6-C8Gua,BPDE-10-N7Ade和新检测到的BPDE-10-N7Gua。稳定的加合物主要是BPDE-10-