上调miRNA145对肝癌细胞的作用及其机制研究

目的:探讨微小RNA145(miRNA145)对肝癌细胞生长、凋亡及侵袭转移的影响。方法:实验将Hep G2细胞随机设置为3组:空白对照组、空质粒组及转染组,转染后real-time PCR法检测验证各组细胞miRNA145及N-钙黏蛋白(N-cadherin)mRNA的表达,并用Western blot检测miRNA145目标蛋白N-钙黏蛋白的表达,MTS增殖实验检测各组细胞的生长情况,流式细胞术检测细胞周期及细胞凋亡率,Transwell法检测各组细胞的侵袭转移能力。结果:Real-time PCR结果证实转染组细胞miRNA145表达比空质粒组和空白对照组细胞明显增多(P0.05),同时N-钙黏蛋白的表达在转染组细胞中显著减少(P0.05);经Western blot结果证实,转染组细胞中N-钙黏蛋白表达比空质粒组和空白对照组细胞明显减少(P0.05);转染组细胞活性在转染后第2天、第3天均明显下降,70.04%的细胞周期停止在G1期,转染后Hep G2细胞凋亡率明显增高,细胞的侵袭转移能力下降,差异均有统计学意义。结论:上调miRNA145表达能有效抑制肝癌细胞的细胞周期进展和侵袭转移,促进细胞凋亡。

Role of up-regulated microRNA145 in viability,apoptosis, invasion and metastasis of hepatoma cells

AIM: To investigate the effects of microRNA145 (miRNA145) on the viability, apoptosis, invasion and metastasis of hepatoma HepG2 cells. METHODS: HepG2 cells were randomly allocated into 3 groups: blank control group, empty mimic transfected group and miRNA145 mimic transfected group. Under the induction of Lipofectamine^TM 2000, the recombinant was transfected into HepG2 cells. After transfection, the expression level of miRNA145 was detected by real-time PCR. The protein level of N-cadherin and the mRNA expression levels of miRNA145 and N-cadherin were detected by Western blot and real-time PCR. The cell viability was detected by MTS assay. The cell cycle and apoptosis were analyzed by flow cytometry. Invasion and metastasis were detected by Transwell assay. RESULTS: Compared with negative control, miRNA145 expression was up-regulated significantly, while the expression of N-cadherin was down-regulated significantly. Meanwhile, the cell viability, cell cycle, apoptosis, invasion and metastasis of hepatoma HepG2 cells were all significantly inhibited (P<0.05). CONCLUSION: miRNA145 dramatically inhibits viability, apoptosis, invasion and metastasis of hepatoma cells.