Gastric Carcinogenesis: 2-Chloro-4-methylthiobutanoic Acid, a Novel Mutagen in Salted, Pickled Sanma Hiraki Fish, or Similarly Treated Methionine
作者:Wei Chen、John H. Weisburger、Emerich S. Fiala、Thomas E. Spratt、Steven G. Carmella、Di Chen、Stephen S. Hecht
DOI:10.1021/tx9500585
日期:1996.1.1
gavage to rats. We now demonstrate that the mutagenicity was enhanced by preincubation of the raw meat for several days before salt-nitrite treatment. HPLC techniques showed that three mutagens were present in the fish extract. One of the mutagens was found to be stable over the pH range of 1.0-9.0. This mutagen was purified by silica gel solid phase extraction, followed by a series of reverse phase HPLC
对高风险胃癌地区的常规腌制和腌制鱼进行了建模,以探索相关的致病化学物质。将鱼Sanma hiraki用pH 3的氯化钠和亚硝酸钠处理。先前,发现处理过的鱼的提取物在鼠伤寒沙门氏菌TA 1535中不含S9时具有致突变性,并且在管饲大鼠时可诱发腺胃癌。 。现在我们证明,通过在亚硝酸盐处理之前几天对生肉进行预孵育可以增强诱变性。HPLC技术表明,鱼提取物中存在三种诱变剂。发现一种诱变剂在1.0-9.0的pH范围内是稳定的。通过硅胶固相萃取纯化诱变剂,然后进行一系列反相HPLC步骤,并且具有低分辨率和高分辨率MS,NMR和FT-IR的特征。虽然通常认为N-亚硝基化合物与胃癌发生有关,但出乎意料地发现诱变剂具有新型结构2-氯-4-甲基硫代丁酸(CMBA)。基于该结构,甲硫氨酸可能是前体,这确实得到了证明。盐和亚硝酸盐都是形成这种诱变剂必不可少的因素。对于0至800 mM NaCl的氯化物浓度,CMBA的产率是线性的。在pH