基础医学与临床 ›› 2018, Vol. 38 ›› Issue (1): 51-56.

• 研究论文 • 上一篇    下一篇

miR-489通过调控TWIST1抑制结肠癌干细胞表型和上皮间质转换

任莉,厉英超,贾皑,张丽,米琛   

  1. 西安交通大学第一附属医院
  • 收稿日期:2017-03-14 修回日期:2017-04-28 出版日期:2018-01-05 发布日期:2017-12-26
  • 通讯作者: 任莉 E-mail:renli37465@163.com
  • 基金资助:
    陕西省社会发展科技攻关项目

miR-489 inhibits the stem cell phenotype and epithelial-mesenchymal transition of colon cancer by regulating TWIST1

  • Received:2017-03-14 Revised:2017-04-28 Online:2018-01-05 Published:2017-12-26

摘要: 目的 探讨miR-489在结肠癌干细胞表型和上皮间质转换中的作用和调控机制。方法 RT-qPCR检测多个人结肠癌细胞系(HT29、SW480、SW620和HCT116)和正常肠道上皮细胞HIEC中miR-489表达;采用基因转染技术提高结肠癌细胞中miR-489表达,Western blot检测过表达miR-489对结肠癌干细胞标志物CD133、CD44、EpCAM、ALDH1和上皮细胞标志物E-cadherin、间质细胞标志物vimentin和N-cadherin的表达;RT-qPCR和Western blot检测TWIST1 mRNA和蛋白表达水平。结果 4个结肠癌细胞系中的miR-489相对表达量显著低于正常肠道上皮细胞HIEC中的表达(P<0.05)。在HT29和HCT116细胞中过表达miR-489,4个结肠癌干细胞标志物表达降低(P<0.05);上皮细胞标志物表达增加(P<0.05);间质细胞标志物表达减少(P<0.05)。TWIST1是miR-489潜在靶基因,在2个细胞系中过表达miR-489,TWIST1 mRNA和蛋白表达水平均显著降低(P<0.05)。 结论 miR-489在结肠癌细胞中低表达,过表达miR-489可能通过调控TWIST1抑制结肠癌干细胞表型和上皮间质转换。

关键词: microRNA-489, TWIST1, 结肠癌, 肿瘤干细胞, 上皮间质转化

Abstract: Objective To explore the effects and regulation mechanism of microRNA-489 (miR-489) on the stem cell phenotype and epithelial-mesenchymal transition of colon cancer cells in vitro. Methods The miR-489 expression of colon cancer cell lines (HT29, SW480 and SW620, HCT116) and normal intestinal epithelial cells HIEC were detected by RT-qPCR, the miR-489 expression in colon cancer cells was raised by gene transfection technology, the colon cancer stem cell markers CD133, CD44, EpCAM, ALDH1 and epithelial marker E-cadherin, mesenchymal cells markers Vimentin and N-cadherin were detected by Western blot. The expression of TWIST1 mRNA and protein were detected by RT-qPCR and Western blot. Results The miR-489 relative expression in four kinds of colon cancer cells (HT29, SW480 and SW620, HCT116) were significantly lower than that of normal HIEC intestinal epithelial cells, the difference was statistically significant (P<0.05). Up-regulation of miR-489 expression in HT29 and HCT116 cells leaded to lower expression of colon cancer stem cell marker CD133, CD44, EpCAM ALDH1 and mesenchymal cells markers Vimentin, N-cadherin, higher expression of epithelial markers E-cadherin (P<0.05). Also, up-regulation of miR-489 expression in HT29 and HCT116 cells leaded to lower expression of TWIST1 mRNA and protein (P<0.05). Conclusion MiR-489 is down-regulated in colon cancer cells and up-regulation of miR-489 expression inhibits stem cell phenotype and epithelial-mesenchymal transition through targeting TWIST1 in colon cancer.

Key words: microRNA-489, TWIST1, colon cancer, Cancer stem cells, Epithelial-mesenchymal transition