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胚胎癌F9细胞中Oct4对miR-302启动子的调控作用

刘海英,黄  青,董静文,李  莉*   

  1. 广州医科大学附属第三医院生殖医学中心,广东省生殖与遗传重点实验室,广东  广州  510150
  • 收稿日期:2014-01-09 修回日期:2014-03-24 出版日期:2014-07-30 发布日期:2014-07-30
  • 通讯作者: 李 莉,E-mail:Lili77191212@163.com
  • 作者简介:刘海英(1978- ),女,黑龙江省海伦市人,博士,主治医师,研究方向:胚胎干细胞。Tel:020-81292233;E-mail:liuhai ying0606@163.com
  • 基金资助:

    广州市医药卫生科技基金资助项目(20121A011155)

Oct4 regulates the miR-302 promoter in F9 mouse embryonic carcinoma cells

LIU Hai-ying,HUANG Qing,DONG Jing-wen,LI Li*   

  1.  The Assisted Reproduction Department, the Third Affiliated Hospital of Guangzhou Medical University, Key Laboratory for Reproduction and Heredity of Guangdong Province, Guangdong 510150, Guangzhou, China
  • Received:2014-01-09 Revised:2014-03-24 Online:2014-07-30 Published:2014-07-30

摘要:

目的: 检测胚胎癌F9细胞中Oct4对miR-302启动子活性是否具有调节作用。方法:构建PGL3-P-miR-302启动子荧光素酶报告基因质粒并验证其活性,然后将0.5 μg PGL3-P-miR-302分别与0.5和1.0  μg Oct4表达质粒共转染至293T细胞中,检测过表达Oct4对miR-302启动子活性的影响;并将0.5  μg PGL3-P-miR-302和Oct4 siRNA(2.0  μg siRNA1和2.0  μg siRNA2)共转染到F9细胞中,检测Oct4 RNA干扰对miR-302启动子活性的影响,以验证Oct4对miR-302启动子是否有调控作用。结果:成功构建了PGL3-P-miR-302启动子荧光素酶报告基因质粒,并证实了PGL3-P-miR-302在F9细胞中具有启动子活性;在T293细胞中,当Oct4表达质粒为0.5 μg时miR-302启动子转录活性是对照组的2.6倍(P<0.05),当Oct4为1.0 μg时miR-302启动子转录活性是对照组的4.3倍(P<0.05);在F9细胞中miR-302启动子的活性在转染Oct4 siRNA后明显下降,约为 siRNA非特异性对照组的68%(P<0.05)。结论:Oct4对miR-302启动子具有正调节作用,miR-302可能是Oct4的靶基因之一。

关键词: Oct4, miR-302, 胚胎癌细胞, 启动子

Abstract:

OBJECTIVE: To investigate whether Oct4 could activate miR-302 promoter in the F9 mouse embryonic carcinoma cells. METHODS:PGL3-P-miR-302 was created by cloning the PCR- amplified region of the miR-302 putative promoter.  PGL3-P-miR-302 promoter reporter plasmids (0.5  μg) were co-transfected with 0.5 μg or 1.0 μg Oct4 expression vector into 293T cells. PGL3-P-miR-302 promoter reporter plasmids (0.5 μg) were co-transfected with Oct4 siRNA(2.0 μg siRNA1 and 2.0 μg siRNA2) into F9 cells. Luciferase activity was assayed. RESULTS:PGL3-P-miR-302 was created,and the cell-specific activity of this promoter was identified by its  transfection into F9 cells. With 0.5 μg  and 1.0 μg Oct4 overexpression in 293T cells,miR-302 promoter activity increased 2.6-fold and 4.3-fold,respectively. After siRNA-mediated knockdown of Oct4,miR-302 luciferase activity fell to 68% compared with control siRNA. CONCLUSION:This study showed that the miR-302 cluster acted downstream of the Oct4 regulation network in F9 cells.

Key words: Oct4, miR-302 cluster, embryonic carcinoma cells, promoter