基础医学与临床 ›› 2019, Vol. 39 ›› Issue (7): 949-953.

• 研究论文 • 上一篇    下一篇

三阴性乳腺癌细胞系MDA-MB-231中PRMT1通过C/EBPα调控c-myc表达

林群1,刘丽铭2,代辉2,张艳君2,张业2   

  1. 1. 中国医学科学院北京协和医学院基础医学研究所
    2. 中国医学科学院基础医学研究所
  • 收稿日期:2019-04-28 修回日期:2019-05-21 出版日期:2019-07-05 发布日期:2019-07-02
  • 通讯作者: 林群 E-mail:578786213@qq.com
  • 基金资助:
    国家自然科学基金

PRMT1 regulates the expression of c-myc through C/EBPα in breast cancer cell line MDA-MB-231

  • Received:2019-04-28 Revised:2019-05-21 Online:2019-07-05 Published:2019-07-02
  • Contact: Qun Lin E-mail:578786213@qq.com

摘要: 目的 研究在三阴性乳腺癌细胞系MDA-MB-231中精氨酸甲基转移酶PRMT1通过C/EBPα调控c-myc表达的机制。 方法 在MDA-MB-231细胞系中分别过表达C/EBPα和敲低PRMT1,在蛋白和mRNA水平检测c-myc表达量;ChIP-qPCR和EMSA检测C/EBPα与c-myc启动子的结合能力;荧光素酶双报告基因检测PRMT1和C/EBPα对c-myc启动子的调控作用。 结果 过表达C/EBPα、敲低PRMT1后,c-myc表达明显下降;C/EBPα蛋白3个甲基化位点35位、156位和165位精氨酸突变为苯丙氨酸后(3RF),C/EBPα对c-myc启动子的转录抑制明显减弱。而3个位点同时突变成赖氨酸后(3RK),PRMT1对c-myc的调控作用消失。 结论 在三阴性乳腺癌细胞系MDA-MB-231中,PRMT1通过甲基化C/EBPα调控c-myc的转录。

关键词: 关键词:PRMT1, C/EBPα, c-Myc, 精氨酸甲基化

Abstract: Objective To investigate how PRMT1 regulates c-myc in breast cancer cells. Methods The expression of c-myc was detected in protein and mRNA levles in overexpressing C/EBPα and knocking down PRMT1 of MDA-MB-231 cells. ChIP-qPCR and EMSA were performed to detect the binding ability of C/EBPα to the promoter of c-myc. The promoter of c-myc activity regulated by PRMT1 and C/EBPα was detected by dual-luciferase report system. Results The expression of c-myc declined dramatically after overexpressing C/EBPα and knocking down PRMT1. The promoter of c-myc activity repressed by C/EBPα was weakened obviously after the methylation sites of C/EBPα at R35F, R156F and R165F were mutated. The regulation of c-myc by PRMT1 has a little effect after the methylation sites of C/EBPα at R35K, R156K and R165K were mutated. Conclusions PRMT1 regulates the transcription of c-myc by methylation of C/EBPα.

Key words: Key words:PRMT1, C/EBPα, c-Myc, Arginine methylation

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