沉默HIF-1α基因对U87细胞增殖、侵袭及转移能力的影响

目的 观察沉默低氧诱导因子1α(HIF-1a)基因后对胶质母细胞瘤U87细胞增殖、侵袭及转移能力的影响.方法 实验分3组,干扰组(转染表达HIF-1α-shRNA的质粒)、对照干扰组(转染阴性对照shRNA序列)及未处理组.干扰组利用前期构建的HIF-1α基因的短发夹RNA(shRNA)沉默HIF-1α基因,构建HIF-1α-shRNA慢病毒表达载体,在脂质体介导下转染人胶质母细胞瘤细胞U87.采用RT-PCR和Western blotting检测HIF-1α基因干扰效率,MTT法检测细胞生长增殖能力,迁移实验检测细胞的体外迁移能力,Transwell小室模型检测细胞的体外侵袭及转移能力.结果 RT-PCR和Western blotting实验证实,与对照干扰组及未处理组比较,干扰组细胞HIF-1αmRNA表达水平明显下降,蛋白条带明显减弱.MTT细胞增殖实验显示,干扰组细胞增殖水平较其他2组明显降低,差异有统计学意义(P<0.05).Transwell小室侵袭实验中,未处理组、对照干扰组、干扰组穿膜细胞数分别为(125.2±10.8)个、(118.3±8.3)个、(60.9±5.4)个,差异有统计学意义(P<0.05).结论 HIF-1α-shRNA能有效抑制U87细胞株HIF-1α mRNA及蛋白的表达,并能抑制U87细胞的增殖、侵袭及转移能力.

Abstract：

Objective To observe the influence of silencing hypoxia-inducible factor-1α(HIF-1α)gene on the proliferation, invasion and metastasis of glioblastoma U87 cells. Methods The samples were divided into 3 groups: blank group: samples without giving any treatments, control group: cells with empty shRNA vector, and experimental group: cells with HIF-1α-shRNA transfection complex. HIF-1α gene was silenced by shRNA constructed in early time; and HIF-1α-shRNA lentivirus vector was constructed in the experimental group, and then transfected into glioblastoma U87 cells with the mediation of liposome. The interference efficiency was detected by using RT-PCR and Western blotting, and cell proliferation was measured by MTT assay; cell migration in vitro was observed by migration test, and invasion and metastasis abilities were detected by Transwell booth model. Results As compared with those in cells of the control and blank groups, the mRNA and protein expressions of HIF-1α in cells of the experimental group were significantly decreased; MTT assay showed that the cell proliferation in the experimental group was significantly lower than that in the other 2 groups (P<0.05). The number of penetrating cells of the blank group, control group and experimental group in Transwell chamber invasion assay were (125.2±10.8), (118.3±8.3), (60.9±5.4), respectively, and significant differences were noted between each 2 groups (P<0.05). Conclusion The mRNA and protein levels of HIF-1α in U87 cells are efficiently depressed by HIF-1α-shRNA, and so are the proliferation, invasion and metastasis abilities of U87 cells.