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PCDH10通过下调Wnt/β-catenin信号通路抑制多发性骨髓瘤细胞的增殖

, PP. 1471-1477

Keywords: 原钙粘蛋白-,Wnt/&beta,-catenin信号通路,多发性骨髓瘤,细胞增殖

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Abstract:

目的探讨原钙粘蛋白-10(procadherin-10,PCDH10)基因是否通过调控Wnt/β-catenin信号通路抑制多发性骨髓瘤细胞的增殖及其相关机制。方法采用脂质体转染法将空载体pcDNA3.1(+)TP53质粒和pcDNA3.1(+)PCDH10质粒分别转染至人多发性骨髓瘤细胞KM3细胞中。实验分为对照组、空载体组、转染组。采用RT-PCR和Westernblot检测3组细胞PCDH10基因的表达。RT-PCR检测不同浓度的LiCl(0、5、10、15、20μmol/mL)处理KM3细胞48h后β-catenin的表达,选取LiCl的最佳浓度分别作用于3组细胞。应用CCK-8法检测细胞增殖能力。采用流式细胞仪检测细胞周期。质粒双荧光素酶报告基因检测系统分析PCDH10转染前后对KM3细胞LEF/TCF基因的影响。实时荧光定量PCR(qRT-PCR)和Westernblot检测β-catenin、c-Myc、Cyclind1基因mRNA、蛋白水平及β-catenin蛋白在细胞核内的表达。免疫荧光观察PCDH10对β-catenin核转位的影响。结果PCDH10基因转染后在细胞中获得稳定表达。CCK-8检测结果发现转染组细胞的增殖能力明显受抑(P<0.05),流式细胞仪检测结果显示转染组细胞周期阻滞于G?1期、增殖指数降低(P<0.05);荧光素酶活性分析显示PCDH10显著抑制LEF/TCF基因活性(P<0.05);qRT-PCR和Westernblot结果显示,转染组细胞中β-catenin、c-Myc、Cyclind1表达明显降低(P<0.05),细胞核内β-catenin的蛋白表达量明显下调;免疫荧光观察到转染组细胞核内β-catenin荧光强度减弱。RT-PCR检测发现20μmol/mL的LiCl为KM3细胞的最佳作用浓度,经LiCl处理3组细胞后,与对照组、空载体组比较,转染组细胞增殖能力及β-catenin、c-Myc、Cyclind1的表达也受到抑制(P<0.05)。结论PCDH10基因能抑制KM3细胞的增殖,其机制可能主要与下调LEF/TCF基因活性及抑制β-catenin核转位有关。

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