Products of the Direct Reaction of the Diazonium Ion of a Metabolite of the Carcinogen <i>N</i>-Nitrosomorpholine with Purines of Nucleosides and DNA
作者:Charles N. Zink、Nicolas Soissons、James C. Fishbein
DOI:10.1021/tx100093a
日期:2010.7.19
major products in the cases of both the nucleoside and DNA adducts. The rates of formation of HE adducts are accelerated in DNA, relative to the nucleosides in the cases of the N7-EA-Ade, N7-EA-Gua, and O6-EA-Gua adducts by factors of 7, 14, and 54, respectively. The initial rates of depurination of the N3-EA-Ade, N7-EA-Gua, and N7-EA-Gua adducts have also been quantified, and they are unexceptional in
已合成了许多衍生自3-羟基-N-亚硝基吗啉的重氮离子的嘌呤核苷和核碱基加合物作为二甲基缩醛。在大多数情况下,将它们转化为醛,或者在两种情况下,将其转化为醛,用温和的酸处理,以生成标准品,用于定量研究上述强力致癌物N的代谢产物对嘌呤核苷和DNA的烷基化作用。-亚硝基吗啉。在许多条件下,就其分解倾向而言,已表征了所得核碱基乙氧基乙醛(EA)加合物的稳定性。与苯并咪唑模型的先前表征的加合物相比,该稳定性通常是无例外的。嘌呤核苷和DNA上加合物的沉积在反应中进行了定量,在该反应中,3-膦基过氧化氢-N-亚硝基吗啉在21±2°C下被水溶性膦还原为羟基代谢物。加合物的谱图与从无环二烷基亚硝胺的简单α-羟基代谢产物观察到的高度相似,双链DNA反应中三种最丰富的乙氧基乙醛(EA)加合物为N7-EA-Gua〜O 6-EA-Gua> N3-EA-Ade。对于主要产物,对于核苷和DNA加合物,已经确定了由最初形