目的:探讨微小RNA191-5p（miR-191-5p）对胃癌细胞迁移、克隆形成和增殖的影响。方法:采用实时定量-聚合酶链反应（Real-time PCR）检测分析了来自山西省肿瘤医院的60例胃癌患者的胃癌组织（C组）及其癌旁正常组织（N组）中miR-191-5p的表达水平；应用pcDNA3.1载体构建过表达miR-191-5p的重组质粒（pcDNA-mRNA-191-5p），实现miR-191-5p在胃癌细胞中的过表达，用miRNA-191-5p inhibitor实现miR-191-5p在胃癌细胞中的低表达；分别用划痕愈合实验、克隆形成实验和CCK-8法检测细胞迁移、克隆形成和增殖能力；Targetscan预测miR-191-5p与周期素依赖性激酶6（CDK6）的结合位点，并通过双荧光报告基因验证；Western印迹检测miR-191-5p对p21和CDK6蛋白表达的影响。结果:与N组相比，C组中有53例（88%）胃癌组织中出现miR-191-5p的表达下调；C组miR-191-5p的表达水平为0.43±0.13，显著低于N组的0.88±0.12，n P<0.001，过表达miR-191-5p能显著抑制胃癌细胞的迁移、克隆形成和增殖能力，差异有统计学意义（n P<0.05）；双荧光报告基因证实miR-191-5p与CDK6的3′UTR结合；Western印迹显示胃癌细胞中pcDNA-miR-191-5p下调了CDK6表达而上调了p21表达。n 结论:miR-191-5p表达下调可能参与胃癌的发生发展，过表达miR-191-5p能下调CDK6并抑制胃癌细胞生长。“,”Objective:To investigate the effects of miR-191-5p on cell migration, clone formation and proliferation of gastric cancer (GC) cells.Methods:The level of miR-191-5p expression was detected by real-time reverse transcriptase-polymerase chain reaction (RT-PCR) in 60 paired GC tissues and their adjacent normal tissues. miR-191-5p overexpression was achieved by transfection of construct pcDNA-miR-191-5p into GC cells. The migration, clone formation and proliferation of GC cells were detected by the scratch wound assay, clone formation assay and cell counting kit-8 (CCK-8), respectively. Low expression of miR-191-5p was achieved with miRNA-191-5p inhibitor. The binding sites of cyclin-dependent kinase 6 (CDK6) and miR-191-5p were analyzed using TargetScan software, and the interaction of CDK6 and miR-191-5p was verified using dual-fluorescence reporter gene expression. Western blot (WB) was used to detect the effect of miR-191-5p on the expression of p21 and CDK6 proteins.Results:miR-191-5p decreased in 53 cases (88%) of GC tissues compared to their controls. Furthermore, overexpression of miR-191-5p effectively inhibited the migration, clone formation and proliferation of GC cells (n P<0.05). Dual-fluorescence reporter confirmed that miR-191-5p bound to 3′UTR of CDK6. WB showed that pcDNA-miR-191-5p inhibited the CDK6 expression but promoted the p21.n Conclusion:Down-regulation of miR-191-5p has a correlation with the progression of GC. Overexpression of miR-191-5p can decrease the expression of CDK6 and inhibit the growth of GC cells.