致癌的亚硝胺在霉变玉米面中的形成

以林县粮食中常见的霉菌,如串珠镰刀菌、黄曲霉菌等,接种于玉米面饼,培养数日后,加一定量的亚硝酸钠,其提取物经GC-MS证实能产生DMNA,DENA与MBNA,这些致癌亚硝胺化合物能诱发动物的肝癌或食管癌.在霉变食物中,霉菌除产生毒素外,还能促进化学致癌物的形成,这为肿瘤病因学提供了新的研究领域。     

In vitro TRANSFORMATION OF RAT ESOPHAGEAL EPITHELIAL CELLS BY FUSARIN C

Fusarin C (FC) is a mutagenic and carcinogenic mycotoxin which was isolated from Fu-sarium moniliforme culture extracts. The Fusarium moniliforme is one of most prevalent fungi found on corn in Linxian, a high risk area for esophageal cancer. This paper reports, for the first time, the malignant transformation of rat esophageal epithelial cells induced by FC. The transformed cells showed several characteristics of transformation. Colonies were formed after seeding these transformed cells either into selective medium free of epidermal growth factor (EGF) and serum, or on semi-solid agar; there was an increase in chromosome number; the expression of c-myc and v-erb-B oncogenes was enhanced in the cells; and squamous cell carcinomas arose after inoculating the cells into nude mice. The results demonstrated transforming effect of FC on rat esophageal epithelial cells, and indicate that the abnormal expression of some oncogenes could serve as a hew property of transformed cells.     

镰刀菌素C体外诱发大鼠食管上皮细胞转化的研究

本文报道用镰刀菌素C(FC),一种致突、致癌的真菌毒素,诱发大鼠食管上皮细胞体外转化作用,转化细胞可在选择培养基或半固体琼脂上生长,形成集落并具有非整倍体核型,以及C-myc和C-erb-B癌基因表达增强,更重要的是,经FC处理的细胞能在裸鼠体内形成鳞状细胞癌,实验结果表明,FC对大鼠食管上皮细胞具有恶性转化作用,本工作还提示癌基因表达异常可作为细胞转化的一种新指标。