The Role of Acetylation in Benzidine Metabolism and DNA Adduct Formation in Dog and Rat Liver
作者:Vijaya M. Lakshmi、Terry V. Zenser、H. Duane Goldman、Glenda G. Spencer、Ramesh C. Gupta、Fong Fu Hsu、Bernard B. Davis
DOI:10.1021/tx00047a011
日期:1995.7
To determine whether benzidine is acetylated in dog, like rat, the metabolism of benzidine was assessed with dog and rat liver slices. Slices were incubated with 0.05 mM [3M]benzidine for 4 h. Media and cellular DNA were analyzed for acetylated benzidine metabolites and adducts. In rat, benzidine was rapidly converted to acetylated metabolites. At 1 h, benzidine, N-acetylbenzidine, and N,N'-diacetylbenzidine
为了确定联苯胺在狗(如大鼠)中是否被乙酰化,用狗和大鼠肝脏切片评估联苯胺的代谢。将切片与0.05 mM [3M]联苯胺孵育4小时。分析了培养基和细胞DNA的乙酰化联苯胺代谢产物和加合物。在大鼠中,联苯胺迅速转化为乙酰化代谢产物。在1小时时,联苯胺,N-乙酰联苯胺和N,N'-二乙酰联苯胺分别占培养基中总放射性的5%,23%和54%。在2小时内,放射性的75%为N,N'-二乙酰基联苯胺。在狗中,4h放射性比联苯胺极性更大的代谢物中存在45%的放射性。在犬肝切片培养基中未观察到N-乙酰化代谢产物。为了鉴定乙酰化联苯胺DNA加合物,N-(脱氧鸟苷-8-基)-N,N' 制备2-二乙酰联苯并通过FAB MS鉴定。该核苷加合物用于合成N-(脱氧鸟苷-8-基)-N-乙酰联苯胺和N'-(脱氧鸟苷-8-基)-N-乙酰联苯胺。通过HPLC分析来自与[3 H]联苯胺一起孵育的切片的核苷加合物。通过这种分析方法,3