TRANSFORMATION OF CULTURED HUMAN FETAL GASTRIC FIBROBLASTS WITH PHYSICO-CHEMICAL AGENTS

Treatment of early passage human fetal gastric fibrohlasts with ultraviolet (UV) light and the chemical carcinogen ethyl nitrosourea (ENU) in succession resulted in an immortally growing cell line, named GTS 8502. The cells of this line display typical transformation characteristics, such as irregularly shaped nuclei, heteroploidization of karyotype and frequent appearance of heteromorphic chromosomes, the enhanced volume ratio of nucleus to cytoplasm, multinucleoli, appearance of microvilli on the surface of the cells and agglutination reaction to lectin concanavalin A. The transformants have high growing and mitotic indices and the ability of focus-formation on monolayers and anchorage independent growth in soft agar medium. Moreover, these cells induced turnouts in nude mice or in immunosuppressed new-born rats through heterotransplantation. The results of various methods including electromicroscopy and histochemical analyses indicate that GTS 8502 cells are of fibroblast origin.Our results thus indi     

离体培养的人胎儿胃成纤维细胞的转化

用紫外线和乙基亚硝基脲先后处理离体培养的正常人胎儿胃细胞,建立了能长久传代的GTS 8502细胞系。该细胞具有典型的转化细胞的特征:核外形不规则、核质比大,核仁增多;细胞表面微绒毛较多;生长指数和分裂指数高;能形成明显的转化灶;在软琼脂培养基中能长成克隆;细胞膜蛋白性质改变;染色体异倍化,异常染色体频繁出现,异种接种肿块诱发率高。电子显微镜观察和组织化学分析等多种结果表明GTS 8502源于成纤维细胞。正常人细胞的体外转化的成功率很低。两种致癌物的协同作用,可提高转化率,从而可能使人细胞的转化成为检测环境致癌物的有效手段。哺乳类细胞的体外转化,多以啮齿类细胞为材料。也有不少实验室从事正常人细胞的体外转化试验,但成功报道仍属罕见。本实验室用两种致癌物先后处理离体培养的人胎儿胃细胞,选出转化细胞后继续培养,迄今已传至80余代,细胞形态及其他生物学特性稳定。该细胞系波命名为GTS 8502。