RTN4-C基因在肝癌组织中的表达及其对SMMC7721细胞生长和凋亡的影响

RTN4-C属于编码内质网蛋白的基因家族(RTNs)。为研究RTN4-C在肝癌及其癌旁组织中的表达情况及其对SMMC7721肝癌细胞株的影响,利用RT-PCR检测RTN4-C在肝癌及其癌旁组织中的表达。构建RTN4-C-pcDNA3.1真核表达重组质粒,用脂质体介导转染SMMC7721肝癌细胞,通过G418稳定筛选,建立转染RTN4-C/SMMC7721稳定细胞株。MTT法测定转染前后细胞生长改变、吖啶橙染色检测细胞凋亡改变、免疫细胞化学检测肿瘤相关蛋白p53、Hsp70和c-Fos表达改变。结果表明,RTN4-C/SMMC7721细胞生长减慢,与对照组相比,第2、3、4d细胞生长抑制率分别为33·8%±0·026、56·2%±0·094、34·8%±0·077;凋亡明显增多。突变型p53蛋白从核内转移到细胞质且表达减弱,c-Fos、Hsp70蛋白表达量明显减弱。提示RTN4-C基因在肝癌组织中存在表达差异,促进突变型p53的核转移并减少其表达量、抑制癌基因c-Fos和Hsp70的表达,从而抑制SMMC7721细胞的生长,促进其凋亡。

RTN4-C Gene Expression in Hepatocellular Carcinoma and Its Influence on SMMC7721 Cell Growth and Apoptosis

RTN4-C gene is a member of RTNs.To investigate its expression in human hepatocellular carcinoma tissues and study its function on SMMC7721 cells,RT-PCR was conducted to detect its expressions in human hepatocellular carcinoma tissues.RTN4-C-pcDNA3.1 plasmid was reconstructed and stably transfected into SMMC7721 cells by Lipofect AMINE.Growth curve of SMMC7721 measured by MTT and apoptosis indentified with acridine orange staining were examined to demonstrate the effect of RTN4-C on SMMC7721.Immunocytochemical analysis for mutant p53、c-Fos、 Hsp70 proteins were conducted.The results showed that the transfected SMMC7721 cells grew more slowly than control and the average inhibition rate at the 1st,2nd and 3rd day were 33.8%±0.026、56.2%±0.094、34.8%±0.077 respectively.In transfected SMMC7721 cell line, the apoptosis was strengthened,mutant p53 protein tranferred from nucleus to cytoplasm and c-Fos、Hsp70 proteins were decreased.Our data indicated RTN4-C gene was expressed differently in hepatocellular carcinoma and its paracancerous tissues.By tranferring mutant p53 protein from nucleus to cytoplasm and decreasing c-Fos、Hsp70 protein expression,RTN4-C inhibited SMMC7721 cells growth and promoted its apoptosis.