基础医学与临床 ›› 2017, Vol. 37 ›› Issue (5): 608-613.

• 研究论文 • 上一篇    下一篇

MCPIP1诱导乳腺癌MDA-MB-231细胞细胞周期停滞

鹿文葆1,刘明明2,修瑞娟2   

  1. 1. 中国医学科学院&北京协和医学院
    2. 中国医学科学院微循环研究所
  • 收稿日期:2016-12-23 修回日期:2017-01-17 出版日期:2017-05-05 发布日期:2017-04-19
  • 通讯作者: 鹿文葆 E-mail:luwenbao_217@163.com

MCPIP1 induces cell cycle arrest in breast cancer cell line MDA-MB-231

,Mingming Liu,   

  • Received:2016-12-23 Revised:2017-01-17 Online:2017-05-05 Published:2017-04-19

摘要: 目的研究单核细胞趋化蛋白诱导蛋白1(monocyte chemotactic protein-induced protein 1, MCPIP1)在乳腺癌细胞MDA-MB-231中的作用及机制。方法用脂质体转染法在MDA-MB-231中分别过表达,或敲低MCPIP1并筛选稳定表达shRNA的单克隆;四甲基偶氮唑蓝(MTT)法检测细胞增殖;流式细胞计量技术检测细胞周期;实时荧光定量PCR(qPCR)检测靶基因半衰期;RNA免疫沉淀法(RNA-IP)检测MCPIP1结合的靶基因;报告子实验检测调节基因3’非编码区(3’ untranslated region,3’UTR)的能力。结果过表达MCPIP1可显著抑制MDA-MB-231细胞增殖(P<0.05),敲低MCPIP1显著促进细胞增殖(P<0.05);并分别显著增加或降低G1期细胞百分比(P<0.01);MCPIP1显著降低细胞周期素依赖性激酶2(CDK2)、细胞周期素依赖性激酶6(CDK6)、周期蛋白D1(Cyclin D1)和周期蛋白E1(Cyclin E1)mRNAs的半衰期(P<0.01);MCPIP1结合细胞周期相关基因(P<0.05);MCPIP1显著降低含不同3’UTR的报告子荧光素酶活性(P<0.05)。结论MCPIP1在乳腺癌细胞株MDA-MB-231中发挥抑癌作用,诱导细胞周期G1期停滞可能是其发挥抑癌功能的机制之一。

关键词: 乳腺癌, MCPIP1, MDA-MB-231, 细胞周期

Abstract: Objective To investigate the functions of Monocyte chemotactic protein-induced protein 1 (MCPIP1) in human breast cancer cell line MDA-MB-231. Methods MDA-MB-231 cells were transfected with GFP-tagged MCPIP1 by Tet-on inducing expression system. Endogenous MCPIP1 was knocked down by stable expressing shRNA. MTT assay was performed to measure the growth of MDA-MB-231 cells after overexpression or knockdown of MCPIP1. FACS method was used to analysis cell cycle in MDA-MB-231 cells. Real-time PCR was used to test the expression of cell cycle-related mRNAs expression and their half-lives. RNA-IP experiment was conducted to detect the mRNA directly enriched by MCPIP1. Luciferase assay was performed to determine whether the mRNA decay was mediated through 3’UTR. Results MCPIP1 overexpression inhibited cell proliferation significantly (P<0.05), while knockdown MCPIP1 promoted cell proliferationwith statistical significances (P<0.05). MCPIP1 induced cell cycle arrest in MDA-MB-231 with statistical significance (P<0.01). MCPIP1 overexpression reduced the half-lives of cell cycle mRNAs (CDK2,CDK6,Cyclin D1,Cyclin E1,respectively) with significance (P<0.01). In addition, cell cycle-related mRNAs were able to be pulled down by GFP-MCPIP1but not isotype IgG (P< 0.05). Compared with control vector, MCPIP1 significant suppressed luciferase activitiesof all four 3’UTR reporters (P< 0.05). Conclusion MCPIP1 functions as a tumor suppressor in human breast cancer cell line MDA-MB-231 through inducing G1 cell cycle arrest.

Key words: breast cancer, MCPIP1, MDA-MB-231, cell cycle

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