摘要目的 观察人类端粒酶反转录酶-胸苷激酶/丙氧鸟苷(phTERT-TK/GCV)联合人类端粒酶反转录酶-肿瘤抑素(phTERT-tumstatin)对肝癌细胞HepG2凋亡以及肝癌相关基因甲胎蛋白(AFP)、RhoC的mRNA及蛋白表达情况的影响.方法 细胞分为未转染组、转染空质粒hTERT-EGFP组(空质粒组)、转染phTERT-tumstatin组(TM组)、转染phTERT-TK后加50 μg/ml GCV组(TK/GCV组)、共转染phTERT-tumstatin和phTERT-TK后加50μg/ml GCV组(MK组).荧光显微镜观察转染肝癌细胞HepG2和肝细胞L-02中EGFP与MCHERRY的表达;采用实时荧光定量PCR与Western blot检测各组AFP与RhoC在mRNA及蛋白水平表达的变化,流式细胞术检测各组转染后HepG2凋亡状况.结果 phTERT-tumstatin、phTERT-TK/GCV转染后两基因在肝癌细胞HepG2特异性表达;TK/GCV组、TM组及MK组AFPmRNA相对表达量分别为0.76±0.09、0.62±0.09、0.49±0.07,RhoC mRNA相对表达量分别为0.80±0.04、0.40±0.02、0.54±0.03,与空质粒组(0.94±0.04、0.94±0.02)比较差异均有统计学意义(P＜0.05),且MK组较TK/GCV组、TM组AFP、RhoC mRNA相对表达差别显著.TK/GCV组、TM组、MK组、空质粒组和未转染组的AFP蛋白相对表达水平分别为0.97±0.02、0.83±0.02、0.69±0.01、1.19±0.03、1.15±0.05,RhoC蛋白相对表达水平分别为1.17±0.01、0.99±0.02、0.77±0.02、1.32±0.05、1.29±0.30(均P＜ 0.01).phTERT-tumstatin、phTERT-TK/GCV共同转染HepG2细胞的凋亡率较二者单独转染组显著升高,二者单独及共转染组凋亡率较转染空质粒组及未转染组差异有统计学意义(P＜0.01).结论 phTERT-TK/GCV及phTERT-tumstatin对肝癌细胞HepG2有显著促凋亡的作用,二者联合作用更强.

abstractsObjective To observe the effect of human telomerase reverse transcriptase-thymidine kinase/ganciclovir (phTERT-TK/GCV) system combined human telomerase reverse transcriptase-tumstatin (phTERT-tumstatin) system on apoptosis of human HepG2 and mRNA expression and protein content of AFP,RhoC related with cancer.Methods Fluorescence microscopy was used to observe expression of EGFP and MCHERRY in transfected HepG2 and L-02.Real-time PCR and Western blot were used to detect AFP and RhoC mRNA and protein content.Flow cytometry was used to detect the apoptosis of transfected HepG2.Results phTERT-tumstatin and phTERT-TK/GCV genes expressed in transfected HepG2.Real-time PCR showed that AFP and RhoC mRNA expression in different group were 0.76±0.09 and 0.80±0.04 (TK/GCV group),0.62±0.09 and 0.40±0.02 (TM group),0.49±0.07 and 0.54±0.03 (MK group).The differences were significant (P ＜ 0.01) except TK/GCV group compared with empty plasmid group.Western blot test results showed that protein content of AFP and RhoC were higher in TK/GCV group (0.97±0.02/1.17± 0.01),TM group (0.83±0.02/0.99±0.02),MK group (0.69±0.01/0.77±0.02) than in empty plasmid group (1.19±0.03/1.32±0.05) and non-transfected group (1.15±0.05/1.29±0.30) (P ＜ 0.01).Additionally,protein content of AFP and RhoC in MK group were significant difference with TK/GCV group and TM group (P ＜ 0.01).Flow cytometry showed that phTERT-tumstatin,phTERT-TK/GCV co-transfected HepG2 cells apoptosis rate was significantly higher than both individually transected group.Cells apoptosis rate of alone and co-transfected groups was significant difference compared with empty vector group and untransfected group.Conclusions The effect of phTERT-TK/GCV and phTERT-tumstatin on pro-apoptotic of HepG2 cells is significant.phTERT-TK/GCV combined with phTERT-tumstatin has strong therapeutic function.