基础医学与临床 ›› 2016, Vol. 36 ›› Issue (12): 1636-1640.

• 研究论文 • 上一篇    下一篇

雌激素通过钙蛋白酶上调p21/CCNE2 mRNA表达并促进乳腺癌细胞MCF-7的侵袭能力

王丹丹1,王筑婷1,杨莉1,宛蕾1,王旭东2   

  1. 1. 贵州医科大学
    2. 贵阳医学院
  • 收稿日期:2016-01-19 修回日期:2016-05-04 出版日期:2016-12-05 发布日期:2016-11-29
  • 通讯作者: 王丹丹 E-mail:756166418@qq.com
  • 基金资助:
    GPR30-CANP-FAK信号通路调控乳腺癌侵袭和转移的研究

Estrogen up-regulates the expression of p21 and cyclin E2 mRNA and enhances MCF-7cell invasion via activation of calpain

  • Received:2016-01-19 Revised:2016-05-04 Online:2016-12-05 Published:2016-11-29

摘要: 目的 探讨17β-雌二醇(E2)对乳腺癌细胞mRNA表达,观察 E2侵袭的分子信号机制。方法以乳腺癌细胞MCF-7为观察模型,用RT-PCR检测目的基因周期抑制蛋白p21和周期蛋白E2(CCNE2)mRNA表达;Transwell体外侵袭实验检测细胞侵袭能力;蛋白印迹法检测蛋白表达;采用化学抑制剂或基因沉默法抑制胞内钙蛋白酶(CANP)活性。结果 E2(10nmol/L)可刺激p21 和CCNE2 mRNA表达显著增加(P<0.01);CANP抑制剂calpeptin (10μmol/L)或MEK抑制剂PD98059 (10μmol/L)对E2诱导的p21和CCNE2 mRNA上调均有显著抑制作用(P<0.01);E2刺激细胞侵袭能力明显增强(P<0.01),而基因沉默CANP2明显抑制E2对CANP的激活及E2诱导的细胞侵袭效应(P<0.01)。结论 E2可通过激活胞内CANP诱导乳腺癌细胞p21和CCNE2 mRNA表达上调并促进细胞侵袭,提示CANP可能为抑制乳腺癌转移的一个潜在药物靶点。

关键词: 雌激素, 钙蛋白酶, 侵袭, p21, 周期蛋白E2

Abstract: Objective To investigate the effect of 17β-estradiol(E2) on the gene expression and coincident enhanced invasion, and the role of ERK-calpain signaling in the E2 action, withthe purpose ofstudyingthe molecular mechanism for the E2 effect. Methods MCF-7 breast cancer cells were used as a model system,RT-PCR was employed to evaluate levels of mRNA of target genes. Transwell invasion assay was applied to access cell invasive ability. Western blot was used to analyze the proteolysis of target proteins, and siRNA was used to knockdown calpain2 gene expression and reduce the activity of calpain. Results Treatment of MCF-7 cells with E2induced significant up-regulation of both p21 and CCNE2 (P<0.01), as well as enhanced invasion. Calpain or MEK specific inhibitors, calpeptin (10μM) and PD98059(10μM), showed tremendous suppression of E2-stimulated expression of p21 /CCNE2 mRNA (P<0.01). Knockdown of calpain2 blocked E2-stimulated calpain activation and cell invasion (P<0.01). ConclusionsE2 induces up-regulation of p21/CNNE2 mRNA and enhances invasion and this effect is mediated via calpain, indicating calpaincould be a potential target for the prevention of metastatic breast cancer.

Key words: Estrogen, Calpain, Invasion, p21, Cyclin E2

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