慢病毒载体介导siRNA对人喉癌抑瘤作用的实验研究

Inhibitory effect of lentiviral vectors expressing small interfering RNA targeting survivin gene on Hep-2 cell growth in vitro and in nude mice

目的研究慢病毒载体介导siRNA抑制survivin基因表达后对人喉癌hep-2细胞体内增殖能力的影响以及对裸鼠移植人喉癌的抑瘤活性。方法应用裸鼠成瘤实验测定致瘤能力的改变,采用RT-PCR和Western blotting测定干扰后survivin基因及其蛋白的表达水平;流式细胞术检测喉癌细胞凋亡指数和增殖指数。结果靶向survivin基因的siRNA可以有效抑制survivin基因的表达,使survivin-mRNA表达减少60%-85%,蛋白表达减少70%;流式细胞术检测细胞凋亡率明显提高(P<0.01),降低了在裸鼠体内成瘤的能力。结论RNA干扰survivin基因表达后明显抑制了人喉癌hep-2细胞的体内增殖能力;siRNA介导的survivin基因下调可明显抑制肿瘤细胞在体内的生长。

Objective To observe the effect of the lentiviral vectors expressing small interfering RNA （siRNA） for survivin gene knockdown in inhibiting Hep-2 cell growth in vitro and its tumorigenicity in nude mice. Methods The tumorigenicity of Hep-2 cells transfected with the siRNA mediated by the lentiviral vectors was tested in nude mice. The expression of survivin gene of the transfected cells at the mRNA and protein levels were detected by RT-PCR and Western blotting, respectively, and the cell cycle changes were analyzed by flow cytometry. Results Transfection of the siRNA targeting survivin significantly decreased the expression of survivin mRNA and protein in Hep-2 cells in vitro by 60%-85% and 70%, respectively, resulting also in increased cell apoptosis as shown by flow cytometry （P0.01）. The transfection significantly lowered the tumorigenicity of the cells in nude mice. Conclusion The lentiviral vectors expressing survivin siRNA can significantly inhibit survivin gene expression in Hep-2 cells and induce the cell apoptosis in vitro, and suppress the tumorigenicity of the cells in nude mice.