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目的 探讨microRNA-140-5p (miR-140-5p)在肾癌发生中的作用.方法 Real-time PCR方法检测肾癌细胞(Caki-1、ACHN、OS-RC-2和786-O)中miR-140-5p的表达.MTS,流式细胞术和Western blotting检测细胞增殖,细胞周期和相关蛋白的改变.结果 降低Caki-1细胞中miR-140-5p的水平后,细胞增殖被抑制,Go/G1期细胞数量显着增加,cyclin D、cyclin E和CDK2、CDK4也随之减少;此外,增加786-O细胞中miR-140-5p的水平后,促进体外细胞增殖和体内肿瘤发生.基因芯片结果发现,蛋白激酶C亚型ε(PKCε)基因在改变Caki-1和786-O的细胞中显著性升高.siPKCε在降低肾癌细胞(RCC)中PKCε蛋白表达的同时,还能显著性反转抑制物/模拟物诱导的细胞增殖和细胞周期的改变.结论 miR-140-5p通过PKCε促进肾癌细胞增殖.“,”Objective To explore the role of micro RNA-140-5p(miR-140-5p) in renal cell carcinoma (RCC)tumorigenesis.Methods The expression of miR-140-5p was determined by Real-time PCR in RCC (Caki-1,ACHN,OS-RC-2 and 786-O),and compared with kidney cortex proximal tubule cell (HK-2).After Caki-1 and 786-O cells were transfected with miR-140-5p inhibitor or mimic,the cell proliferation,cell cycle and related proteins were evaluated by MTS assay,flow cytometry and Western blotting.Results Caki-1 and 786-O showed the highest and lowest expression of miR-140-5p respectively.After the level of miR-140-5p in Caki-1 cells was decreased,cell proliferation was inhibited and cell number in G0/G1 phase was increased significantly,along with the reduction of cyclin D,E and CDK2,4.Furthermore,the increasing level of miR-140-5p in 786-O cells promoted cell proliferation in vitro and tumorigenesis in vivo.Moreover,microarray demonstrated that protein kinase C isoform ε(PKCε),a markedly enhanced gene in RCC cells with the changed level of miR-140-5p.The combination treatment with down-regulation of PKCε,inhibitor/mimic induced changes of cell proliferation and cell cycle arrests were marked reversed in Caki-1 and 786-O cells.Conclusion These result indicate that miR-140-5p may promote cell proliferation via PKCε in RCC.