Ability of Hypochlorous Acid and <i>N</i>-Chloramines to Chlorinate DNA and Its Constituents
作者:Naomi R. Stanley、David I. Pattison、Clare L. Hawkins
DOI:10.1021/tx100188b
日期:2010.7.19
8-chloro-2′-deoxyguanosine (8CldG). With the nucleosides, 8CldG was the favored product in each case, and HOCl was the most efficient chlorinating agent. 5Cl(d)C was the most abundant product on exposure of the nucleotides and DNA to HOCl and His-C, with only low levels of chlorinated products observed with Lys-C, Gly-C, Tau-C, and Mono-C. 5CldC was also formed on exposure of smooth muscle cells to either HOCl
髓过氧化物酶是活化吞噬细胞释放的血红素酶,负责产生强氧化剂次氯酸(HOCl)。尽管HOC1具有强力的杀菌特性,并且在人类免疫系统中起着重要的作用,但是这种氧化剂也会对组织造成损害,特别是在炎症条件下。慢性炎症与许多癌症的发生之间有很强的联系,这可能与HOCl和相关氧化剂(例如N-氯胺)破坏DNA的能力有关。然而,与HOCl相反,关于N-氯胺与DNA及其成分的反应性知之甚少。在这项研究中,我们研究了HOCl和各种N的能力。-氯胺在核苷,核苷酸,DNA和细胞系统中形成氯化基础产物。实验是用进行Ñ形成在-chloramines Ñ α乙酰基-组氨酸(His-C),Ñα-乙酰基赖氨酸(Lys-C),甘氨酸(Gly-C),牛磺酸(Tau-C)和氨(Mono-C)。用HOCl和His-C处理DNA和相关物质导致形成5-氯-2'-脱氧胞苷(5CldC),8-氯-2'-脱氧腺苷(8CldA)和8-氯-2'-脱氧鸟苷(