Mutagenicity in Salmonella typhimurium TA98 and TA100 of nitroso and respective hydroxylamine compounds
作者:Torsten Haack、Lothar Erdinger、Gernot Boche
DOI:10.1016/s1383-5718(01)00140-1
日期:2001.4
Five aromatic nitroso compounds were prepared and their mutagenicity in Salmonella typhimurium strains TA98 and TA100 compared with that of the corresponding hydroxylamines and the previously studied nitroarenes. A remarkable correspondence of the dose-response curves was observed between the nitroso and the respective hydroxylamine compounds. This effect could be observed in TA98 and TA100. It was
制备了五种芳香亚硝基化合物,并将它们在鼠伤寒沙门氏菌菌株TA98和TA100中与相应的羟胺和先前研究的硝基芳烃进行了诱变。在亚硝基和相应的羟胺化合物之间观察到剂量反应曲线的显着对应。在TA98和TA100中可以观察到这种效果。它仅少量依赖于大鼠肝脏S9-mix的代谢活化。即使先前显示已显着影响硝基芳烃的诱变性质的,甚至在官能团附近或远离官能团的大烷基取代基的存在也不会显着影响亚硝基和羟胺类的性质。后两者之间的相似性可能是由于在测试条件下亚硝基芳烃迅速还原为羟胺类所致。似乎酶不参与该还原步骤,因为在功能基团附近的空间拥挤并不影响该行为。带有大取代基的芳族羟胺的试验结果表明,至少有两种方法可以通过这种基团影响芳族硝基化合物的致突变性。靠近官能团(邻位)的取代基会干扰硝基的酶促还原,因为3-叔丁基-4-羟氨基联苯及其相应的亚硝基化合物具有很高的致突变性,而3-叔丁基-4-硝基联苯则具有高致突变性