miR-106b在肝癌细胞中激活Wnt通路

MiR-106b activate Wnt / β-catenin pathway in HCC cells

目的:探讨肝癌细胞中miR-106b对Wnt/β-catenin信号传导通路的影响。方法:改变肝癌细胞中miR-106b表达,TOP/FOP荧光素酶试验检测Wnt/β-catenin信号通路活性的变化;Real-time PCR方法检测Wnt/β-catenin信号通路下游靶基因表达的改变;Western blotting方法检测细胞核内β-catenin表达改变。结果:过表达miR-106b,肝癌细胞中TOP/FOP荧光比值显著增加,其下游6个靶基因mRNA表达量也显著上调。而抑制miR-106b,则下调荧光比值和下游靶基因的表达。同时发现,miR-106b表达,促进QGY-7703细胞核内β-catenin表达增加,而抑制miR-106b,则核内β-catenin下调。结论:miR-106b在肝癌细胞中可激活Wnt/β-catenin信号通路。

Objective To investigate the influence of miR-106b on Wnt/β-catenin pathway in HCC ceils. Methods QGY-7703 and HepG2 cells were transfected with miRNA mimics or inhibitors. TOP/FOP luciferase ratio assay was used to test the Wnt/β-catenin pathway activity. The expression of downstream targeted genes of Wnt/β-catenin pathway were examined by Real-time PCR. The accumulation of β-catenin in nuclears were measured by Western blotting. Results Ectopic expression of miR-106b dramatically increased the average TOP/FOP ratio and the mRNA expression of downstream targeted genes in QGY-7703 and HepG2 ceils. Compared with that in control cells, miR-106b over-expression promoted the nuclear β-catenin accumulation in QGY-7703 cells. Clonclusion MiR-106b activated Wnt/β-catenin pathway in HCC cells.