不可逆性电穿孔介导HPV16 E6 shRNA干扰质粒对宫颈癌SiHa细胞增殖的影响

目的:探讨利用治疗剂量脉冲电场产生不可逆电穿孔(IRE)介导HPV16 E6 shRNA干扰质粒进入细胞的可行性,阐明二者共同作用对宫颈癌SiHa细胞增殖的影响及其作用机制。方法:将HPV16 E6基因特异性干扰序列插入pGenesil-1质粒,构建HPV16 E6 shRNA真核表达载体,将10个电压为800 V、脉宽100 μs、频率1 Hz的IRE作用于SiHa细胞与HPV 16 E6 shRNA干扰质粒的混悬液,根据处理因素组合,分为空白对照组、IRE处理组、pGenesil-N组、pGenesil-N+IRE组、pGenesil-E6组和pGenesil-E6+IRE组。在荧光显微镜下观察SiHa细胞绿色荧光蛋白(GFP)的表达,计算GFP表达效率;RT-PCR法检测HPV 16 E6 mRNA表达水平,Western blotting法检测HPV16 E6蛋白、P53及PCNA蛋白表达水平,CCK-8法检测各组SiHa细胞增殖能力的变化。结果:成功构建HPV16 E6 shRNA真核表达载体,IRE处理后24 h细胞即可见到绿色荧光;与IRE组比较,pGenesil-E6+IRE组E6 mRNA表达水平下降(P<0.05),E6蛋白表达水平降低(P<0.05),P53蛋白表达水平增高(P<0.05),PCNA表达水平下降(P<0.05);CCK-8法检测,与pGenesil-E6组比较,pGenesil-E6+IRE组细胞增殖活性下降更明显(P<0.05)。结论:治疗剂量的IRE可介导外源基因进入细胞,二者联合作用能明显抑制宫颈癌SiHa细胞增殖。

Influence of irreversible electroporation mediated HPV16 E6 shRNA interference plasmid in proliferation of cervical cancer SiHa cells

Objective To explore the feasibility of using irreversible electroporation (IRE)mediating HPV16 E6 shRNA into cervical cancer cell line SiHa,and to clarify the influence of their co-effect on the proliferation of SiHa cells and its mechanism.Methods A HPV16 E6 gene specific interference sequence was inserted in pGenesil-1 to build a interference vector.10 pulses of IRE with 800 V,100 μs,and 1 Hz were applied to the suspension of SiHa cells and vectors.According to the treatment factors,control group,IRE group,pGenesil-N group,pGenesil-N+IRE group,pGenesil-E6 group and pGenesil-E6 + IRE group were set up.The expression of green fluorescent protein (GFP)and transfection efficiency were confirmed by inverted fluorescence microscope 24 h after the vector was transfected by IRE,and the expression efficancy of GFP was calculated.The expression levels of E6 mRNA and protein were detected by RT-PCR and Western blotting method which was also applied to detect the expressions of P53 and PCNA.The proliferative activity of SiHa cells was determined by CCK-8 assay.Results Enzyme digestion and DNA sequencing verified that the vectors were correctly constructed.GFP was seen under inverted fluorescence microscope 24 h after IRE transfection.Compared with IRE group,the expression levels of E6 mRNA and protein were decreased detected by RT-PCR and Western blotting method after the vectors were treated with IRE,the P53 protein expression level was increased (P < 0.05),and the PCNA expression level was decreased (P <0.05).The CCK-8 assay results showed the proliferative activity of SiHa cells in pGenesil-E6+IRE group was decreased more obviously than that in pGenesil E6 group (P <0.05).Conclusion IRE can play the role of gene transfection of mediating HPV16 E6 shRNA into SiHa cells, and their co-effect can significantly inhibit the proliferation of SiHa cells.