Characterization of directly acting mutagens produced from N-nitroso-N-(formylmethyl)alkylamines: Their possible involvement in the carcinogenesis of N-nitrosamines having a 2-hydroxyethyl group.
作者:EMAKO SUZUKI、MARIKO OSABE、MASATAKA MOCHIZUKI、YUKO WAKABAYASHI、MASASHI OKADA
DOI:10.1248/cpb.35.4022
日期:——
Directly acting mutagens formed from N-nitroso-N- (formylmethyl) alkylamines (3) were isolated and identified as N-nitroso-N-alkyl-1-hydroxyimino-2-oxoethylamines (4). Their structures were elucidated on the basis of nuclear magnetic resonance spectra and confirmed by derivatization to the crystalline 2, 4-dinitrophenylhydrazones (5). Compounds 4 (alkyl =ethyl and butyl) were strongly mutagenic to Salmonella typhimurium TA 1535 and Escherichia coli WP2 hcr- without metabolic activation, while 4 with a tert-butyl group was not mutagenic. The formation of 4 is considered to proceed by the nitrosation of 3, indicating a possible involvement of the formylmethyl metabolite in carcinogenesis by N-nitrosamines with a 2-hydroxyethyl group.
从 N-亚硝基-N-(甲酰基甲基)烷基胺(3)中分离出直接作用的诱变剂,并确定其为 N-亚硝基-N-烷基-1-羟基亚氨基-2-氧代乙胺(4)。根据核磁共振波谱阐明了它们的结构,并通过衍生成结晶的 2,4-二硝基苯肼(5)得到了证实。化合物 4(烷基=乙基和丁基)对鼠伤寒沙门氏菌 TA 1535 和大肠杆菌 WP2 hcr- 具有强烈的致突变性,而带有叔丁基的 4 则没有致突变性。4 的形成被认为是通过 3 的亚硝基化进行的,这表明带有 2-羟乙基的 N-亚硝胺可能参与了甲酰基甲基代谢物的致癌过程。