作者:James F. Hatcher、Katsumi Yamamoto、Masataka Ichikawa、George T. Bryan、Santhanam Swaminathan
DOI:10.1002/em.2850250109
日期:——
derivatives obtained by chemical reduction of III, and thus represent nitroreduction products. These derivatives have been identified as cis- and trans-oxime isomers of methyl 3,4-dichloro-2-furoate, based on spectroscopic analyses. These oximes were not mutagenic for TA100. Furthermore, III was more mutagenic under anaerobic conditions, suggesting that secondary superoxide or nitroanion free radicals
为了深入了解实验致癌物诱变和致癌作用的生化机理,5-硝基呋喃是一系列新的3,4-二氯-5-硝基呋喃,包括3,4-二氯-5-硝基-2-乙酰基呋喃(I ),合成了3,4-二氯-5-硝基-2-溴乙酰基呋喃(II),3,4-二氯-5-硝基-2-呋喃甲酸甲酯(III),并测试了它们在标准物中的诱变形式用鼠伤寒沙门氏菌TA98,TA100和TA100NR(一种氮还原酶活性不足的TA100衍生物)进行板分析。与TA100相比,TA98中的诱变响应降低了2至6倍。此外,I和II在TA100NR中的活性较低,而化合物III在TA100NR中的诱变性是亲本菌株TA100的四倍。用NADPH和细菌裂解液孵育III表明,与TA100NR相比,TA100的还原程度更大。将III与TA100的裂解物温育后获得的乙酸乙酯提取物的高压液相色谱分析表明,形成了四种代谢物,保留时间约为4.0、5.7、10.0和14.3分钟。保留时间为10