RNAi介导的 IGF1R基因沉默对肝癌细胞生长、迁移与侵袭的影响

摘要

AIM:To investigate the effect of RNA interference (RNAi)-mediated insulin-like growth factor 1 receptor ( IGF1R) gene silencing on the growth , migration, and invasion of hepatocellular carcinoma cells .METHODS:The most effective siRNA targeting IGF1R gene was designed and screened .After lentiviral expression vector pLVX-shR-NA2-IGF1R carrying the most effective siRNA sequence was constructed , it was transfected into 293T cells and packed into pLVX-shRNA2-IGF1R lentivirus.Huh7 and Hep3B cells were infected with the pLVX-shRNA2-IGF1R lentivirus to screen the positive clone Huh7 cells and Hep3B cells with the lentivirus .These Huh7 cells and Hep3B cells were cultured to ana-lyze the mRNA level of IGF1R, cell proliferation, cell cycle, cell apoptosis, cell migration/invasion, and the protein levels of IGF1R, Ki-67, p-AKT, p-ERK1, Gli1,β-catenin, cyclin D1, p21 and BCL-XL.RESULTS:The mRNA expression of IGF1R in Huh7 cells and Hep3B cells with pLVX-shRNA2-IGF1R lentivirus was significantly reduced .The proliferation of these cells was remarkably inhibited , and the number in G 1 phase was increased significantly .The percentages of apop-totic cells were increased markedly , and the number of cell migration/invasion was decreased markedly .The protein levels of IGF1R, Ki-67, p-AKT, p-ERK1, Gli1,β-catenin, cyclin D1, p21 and BCL-XL were decreased significantly compared with the blank control group and negative control group .CONCLUSION:The RNAi-mediated IGF1R gene silencing sig-nificantly suppresses the growth and the malignant biological characteristics of Huh 7 cells and Hep3B cells, which may be involved in the reduced protein levels of the above genes induced by down -regulation of IGF1R expression.%目的：研究RNA干扰（ RNAi）介导的胰岛素样生长因子1受体（ IGF1R）基因沉默对肝癌细胞生长、迁移与侵袭的影响。方法：设计并筛选抑制IGF1R mRNA表达效率最高的siRNA序列，构建该序列的慢病毒表达载体，转染293T细胞进行病毒包装。将包装好的慢病毒感染Huh7和Hep3B肝癌细胞，筛选沉默IGF1R基因表达的稳定细胞株。将上述稳定细胞株扩大培养，检测细胞IGF1 R mRNA表达变化，细胞生长、迁移与侵袭能力变化，以及Ki－67、p－AKT、p－ERK1、Gli1、β－catenin、cyclin D1、p21、BCL－XL的蛋白表达水平变化。结果：与空白及阴性对照组比较，感染携带IGF1R干扰序列慢病毒的Huh7和Hep3B肝癌细胞IGF1R mRNA表达水平显著下调，细胞增殖活性明显降低，细胞凋亡显著增加，细胞迁移和侵袭能力明显受到抑制，细胞中IGF1R、Ki－67、p－AKT、p－ERK1、Gli1、β－catenin、cyclin D1、p21及BCL－XL蛋白表达水平均显著降低。结论：RNAi介导的IGF1R基因沉默可明显抑制Huh7和Hep3B肝癌细胞生长及恶性生物学特征，这可能与IGF1R表达水平显著下调而引起上述调控细胞增殖、抗凋亡基因以及相关信号通路基因的蛋白表达水平显著降低有关。