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ShRNA-mediated silencing of the Bmi-1 gene promotes senescence and inhibits migration in human gastric caner cell line BGC823
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- Author:
- No author available
- Journal Title:
- WORLD CHINESE JOURNAL OF DIGESTOLOGY
- Issue:
- 4
- DOI:
- 10.3969/j.issn.1009-3079.2010.04.004
- Key Word:
- Bmi-1;sLRNA;胃癌;细胞衰老;细胞转移
Abstract： 目的:研究靶向Bmi-1 siRNA对胃癌BGC823细胞衰老和转移的作用.方法:设计Bmi-1的siRNA靶序列,分别合成两条互补的寡核苷酸链,退火后重组入pRNAT-U6.2载体,转化扩增后进行序列测定.用脂质体包裹转染人胃癌BGC823细胞,采用RT-PCR和Western blot分别检测Bmi-1基因mRNA和蛋白表达的变化.SA-β-Gal染色检测和细胞体外侵袭实验检测分析对细胞衰老和侵袭、转移的影响.结果:靶向Bmi-1基因的siRNA的双链寡核苷酸片段克隆入pRNAT-U6.2载体,经测序分析,插入片段正确:RT-PCR和Western blot检测显示,Bmi-1基因的表达水平明显降低,其中以1 104-1 122 nt(GGAGGAGGTGAATGATAAA)为靶序列的siRNA沉默作用最佳,Bmi-1mRNA和蛋白表达几乎完全抑制.转染siRNA组的衰老细胞百分率显著升高、穿透Matrigel的细胞数显著下降,与未转染和转染空载体组比较差异有显著性(P<0.01).结论:抑制胃癌BGC823细胞Bmi-1基因表达,可以增加细胞的衰老和降低细胞侵袭、转移的能力.
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