Investigation of 2′-Deoxyadenosine-Derived Adducts Specifically Formed in Rat Liver and Lung DNA by <i>N</i>′-Nitrosonornicotine Metabolism
作者:Yupeng Li、Erik S. Carlson、Adam T. Zarth、Pramod Upadhyaya、Stephen S. Hecht
DOI:10.1021/acs.chemrestox.1c00012
日期:2021.4.19
NNN-specific dAdo-derived adducts, N6-[5-(3-pyridyl)tetrahydrofuran-2-yl]-2′-deoxyadenosine (N6-Py-THF-dAdo) and 6-[2-(3-pyridyl)-N-pyrrolidinyl-5-hydroxy]-2′-deoxynebularine (Py-Py(OH)-dN), were observed for the first time in calf thymus DNA incubated with 5′-acetoxyNNN. More importantly, Py-Py(OH)-dN was also observed in relatively high abundance in the liver and lung DNA of rats treated with racemic
国际癌症研究机构已将烟草特异性亚硝胺 N′-亚硝基鸟尼古丁 (NNN) 和 4-(甲基亚硝胺)-1-(3-吡啶基)-1-丁酮 (NNK) 归类为“对人类致癌”(第 1 组)。为了发挥其致癌性,NNN 需要代谢激活以形成烷基化 DNA 的反应性中间体。以前的研究已经确定细胞色素 P450 催化的 NNN 的 2'-羟基化和 5'-羟基化是主要的代谢途径,在一些培养的人体组织和 patas 猴子中通过 5'-羟基化途径优先激活。到目前为止,从大鼠组织中 NNN 5'-羟基化中鉴定出的唯一 DNA 加合物是 2-[2-(3-吡啶基)-N-吡咯烷基]-2'-脱氧肌苷 (Py-Py-dI)、6-[2-(3-吡啶基)-N-吡咯烷基]-2'-脱氧肌苷 (Py-Py-dN) 和还原后的 N6-[4-羟基-1-(吡啶-3-基)丁基]-2'-脱氧腺苷 (N 6-HPB-dAdo)。为了扩展 NNN 5'-羟基化形成的