Reactions of .alpha.-Acetoxy-N-nitrosopyrrolidine and .alpha.-Acetoxy-N-nitrosopiperidine with Deoxyguanosine: Formation of N2-Tetrahydrofuranyl and N2-Tetrahydropyranyl Adducts
作者:Ruth Young-Sciame、Mingyao Wang、Fung-Lung Chung、Stephen S. Hecht
DOI:10.1021/tx00046a016
日期:1995.6
accounts for part of the THF-dG and THP-dG produced from the alpha-acetoxynitrosamines; stable oxonium ion-derived electrophiles may also be involved in the formation of THF-dG and THP-dG. Comparisons of the yields of various adducts in the reaction of alpha-acetoxyNPYR and alpha-acetoxyNPIP with dG showed some major differences. Whereas yields of THF-dG and THP-dG were similar, adducts formed from open chain
这项研究的目的是比较α-乙酰氧基-N-亚硝基吡咯烷(α-乙酰氧基NPYR)和α-乙酰氧基-N-亚硝基哌啶(α-乙酰氧基NPIP)与脱氧鸟苷(dG)的反应。α-乙酰氧基NPYR和α-乙酰氧基NPIP是由NPYR和NPIP代谢形成的α-羟基亚硝胺的稳定前体。这些α-羟基亚硝胺被认为是NPYR和NPIP的最接近致癌物。NPYR和NPIP虽然在结构上相似,但具有显着不同的致癌特性,将它们的代谢活化形式与dG和最终DNA的反应进行比较可以提供有关其致癌机理的见解。α-乙酰氧基NPYR和α-乙酰氧基NPIP与dG的反应在37℃和pH 7.0下进行。通过HPLC分析产物,并通过其光谱性质和与标准品的比较来表征。在每个反应中,主要产物之一是新型的dG加合物:由α-乙酰氧基NPYR生成的N2-(四氢呋喃-2-基)dG(THF-dG)和N2-(3,4,5,6-四氢-来自α-乙酰氧基NPIP的2H-吡喃-2-基