YAF2靶向cyclin D1表达促进肿瘤细胞增殖

摘要

Objective To explore the molecular mechanism by which YY1 associated factor 2(YAF2) up-regulates cyclin D1 expression in tumor cells as well as the effect of YAF2-cyclin D1 regulatory loop on tumor cell prolifera-tion. Methods Overexpression and knockdown experiments combined with Western blot and real-time quantitative PCR were used to detect the expression of YAF2 and cyclin D1;Dual luciferase reporter assay was performed to in-vestigate the effect of YAF2 on cyclin D1 promoter activity;Flow cytometry analysis was carried out to elucidate the effect of YAF2 on cell cycle progression through targeting cyclin D1;Colony formation assay was employed to deter-mine cell proliferation under different YAF2 and cyclin D1 expression level. Results YAF2 upregulated the ex-pression of cyclin D1 at both the mRNA(P<0.05) and protein level;YAF2 activated the promoter activity of cyc-lin D1 (P<0.05);YAF2 silencing increased significantly the proportion of cells in G0/G1phase(P<0.0001) and reduced the proportion of cells in S phase by regulating cyclin D1 (P<0.002); YAF2 facilitated the cell colony formation via targeting cyclin D1(P<0.05). Conclusions In tumor cells,YAF2 promotes the expression of cyclin D1,and enhances cell cycle progression and cell proliferation.%目的 研究YY1相关因子2(YAF2)在肿瘤细胞中上调细胞周期蛋白D1(cyclin D1)表达的分子机制以及对肿瘤细胞增殖的影响.方法 在肿瘤细胞中过表达和敲低YAF2,用Western blot和实时荧光定量PCR实验检测YAF2和cyclin D1的表达;利用双荧光素酶报告基因实验探究YAF2对cyclin D1启动子活性的影响;流式细胞计量术分析YAF2对细胞周期的影响与cyclin D1表达的关系;平板克隆形成实验检测YAF2和cyclin D1不同表达水平对细胞增殖的影响.结果 YAF2上调cyclin D1的mRNA(P<0.05)和蛋白水平;YAF2激活cyclin D1的启动子(P<0.05);敲低YAF2通过调节cyclin D1使G0/G1期细胞比例增加(P<0.0001),S期细胞比例减少(P<0.002);YAF2通过靶向cyclin D1促进细胞克隆形成(P<0.05).结论 在肿瘤细胞中,YAF2激活cyclin D1表达,促进肿瘤细胞周期进展和增殖.