基础医学与临床 ›› 2014, Vol. 34 ›› Issue (5): 622-627.

• 研究论文 • 上一篇    下一篇

肿瘤pH微环境通过激活β-catenin/TCF4增强人乳腺癌肿瘤细胞的干性

曹峰琦1,陈翀1,刘妍2,白丽鹏1,罗云萍1   

  1. 1. 中国医学科学院基础医学研究,所北京协和医学院基础学院
    2. 中国医学科学院 基础医学研究所,北京协和医学院 基础学院,
  • 收稿日期:2014-02-17 修回日期:2014-03-13 出版日期:2014-05-05 发布日期:2014-04-28
  • 通讯作者: 罗云萍 E-mail:yunpingluo@hotmail.com
  • 基金资助:
    国家重点基础研究发展计划

The tumor pH microenvironment enhance stemness properties via β-catenin/TCF4 activation in human breast cancer cells

  • Received:2014-02-17 Revised:2014-03-13 Online:2014-05-05 Published:2014-04-28

摘要: 目的 探讨酸性微环境对于乳腺癌肿瘤干细胞干性的影响及其作用机制。方法 分别在pH6.8和7.4的环境下,培养人乳腺癌细胞MDA-MB-231。用流式细胞术、PCR、Western blot、体外成球实验和细胞划痕实验分别检测肿瘤干细胞ALDHhigh细胞亚群的比率,干性基因SOX2、OCT4和Lin28b的表达,成球能力和肿瘤细胞迁移能力,同时检测相关信号通路的激活。结果 酸性微环境通过激活β-catenin/TCF4信号通路提高MDA-MB-231的ALDHhigh细胞亚群的比例(P<0.05),上调干性相关基因的表达(P<0.01),增强体外成球能力(P<0.01)和迁移能力(P<0.05)。结论 酸性微环境能够上调干细胞比例,维持肿瘤干细胞干性特征,增加乳腺癌肿瘤细胞迁移能力。

关键词: 乳腺癌, 肿瘤干细胞, 酸性微环境

Abstract: Objective To investigate the effects of acidic tumor microenvironment on maintaining stemness and underneath mechanism in breast cancer stem cells. Methods Cultured the human breast cancer cell MDA-MB-231 with either pH 6.8 or pH 7.4 medium, the percentage of ALDHhigh subpopulation, the expression of SOX2, OCT4, Lin28b and the stemness properties were detected by using FCM, Real-time PCR, Western blot, sphere test and scratch experiments. The activation of signaling pathway was also detected. Results All stemness properties of MDA-MB-231 cell cultured with pH 6.8 conditional medium were increased including the percentage of ALDHhigh subpopulation(P<0.05), the expression of stemness gene(P<0.01), the capability of sphere formation(P<0.01) and cell mobility(P<0.05). These stemness properties of MDA-MB-231 cell were regulated via β-catenin/TCF4 signaling pathway that activated by pH 6.8 cultured medium. Conclusion The acidic tumor microenvironment increases the percentage of ALDHhigh subpopulation and enhances stemness phenotypes of breast cancer cells.

Key words: breast cancer, cancer stem cells, acidic microenvironment.

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