吉林大学学报(医学版) ›› 2017, Vol. 43 ›› Issue (06): 1080-1086.doi: 10.13481/j.1671-587x.20170603

• 研究基础 • 上一篇    下一篇

14-3-3ε蛋白在小鼠卵母细胞减数分裂恢复过程中对Cdc25B定位的影响

孟峻, 侯艳军, 刘珊, 樊淑珍, 韩艳秋   

  1. 内蒙古医科大学附属医院检验科, 内蒙古 呼和浩特 010050
  • 收稿日期:2017-05-02 出版日期:2017-11-28 发布日期:2017-12-01
  • 通讯作者: 孟峻,主任检验师,硕士研究生导师(Tel:0471-3451304,E-mail:nmfrank@163.com) E-mail:nmfrank@163.com
  • 作者简介:孟峻(1968-),男,内蒙古自治区乌兰察布市人,主任检验师,医学博士,主要从事生殖分子生物学方面的研究。
  • 基金资助:
    国家自然科学基金资助课题(81360109,81660267);内蒙古自治区科技厅自然科学基金资助课题(2013MS1163)

Effect of 14-3-3ε protein on localization of Cdc25B during meiotic resumption of mouse oocytes

MENG Jun, HOU Yanjun, LIU Shan, FAN Shuzheng, HAN Yanqiu   

  1. Department of Clinical Laboratory, Affiliated Hospital, Inner Mongolia Medical University, Hohhot 010050, China
  • Received:2017-05-02 Online:2017-11-28 Published:2017-12-01

摘要: 目的:探讨14-3-3ε蛋白在小鼠卵母细胞减数分裂恢复过程中对Cdc25B定位的影响,为阐明14-3-3ε蛋白对小鼠卵母细胞发育的调控机制奠定基础。方法:采用超排卵方法获得3周龄昆明系雌性小白鼠生发泡(GV)期卵母细胞分为未注射组、control siRNA注射组和14-3-3εsiRNA注射组。构建pmax-FP-Red-HA-14-3-3ε表达载体。间接免疫荧光技术检测14-3-3ε蛋白和Cdc25B在小鼠卵母细胞中的定位;直接免疫荧光技术观测14-3-3ε蛋白和Cdc25B蛋白在小鼠卵母细胞中的亚细胞定位;利用显微注射方法将14-3-3εsiRNA注射入GV期卵母细胞中,相差显微镜下观测卵母细胞的形态表现,计算卵母细胞的生发泡破裂(GVBD)发生率;Western blotting法检测卵母细胞中14-3-3ε蛋白的表达和Cdc2-pTyr15蛋白的相对表达水平;放射自显影检测卵母细胞中成熟促进因子(MPF)的活性。结果:间接和直接免疫荧光实验,野生型Cdc25B能与14-3-3ε蛋白共定位于细胞质;在GVBD前期,Cdc25B由胞浆穿梭进入细胞核。当Cdc25B蛋白的第321位丝氨酸突变为丙氨酸时,14-3-3ε蛋白的表达水平降低,Cdc25B的胞浆定位被取消。未注射组、control siRNA注射组卵母细胞在显微注射24 h后均未发生GVBD,GVBD发生率组间比较差异无统计学意义(P>0.05);14-3-3εsiRNA注射组在显微注射后22和24 h卵母细胞的GVBD发生率均高于未注射组和control siRNA注射组(P<0.01),显微注射后24 h卵母细胞到达第2次减数分裂中期(MⅡ)的比例高于未注射组和control siRNA注射组(P<0.01)。结论:在小鼠卵母细胞减数分裂恢复过程中,Cdc25B的Ser321位点可能是14-3-3ε蛋白调控Cdc25B细胞内定位的具体作用位点。

关键词: 亚细胞定位, 14-3-3ε, Cdc25B, 卵母细胞

Abstract: Objective:To explore the effect of 14-3-3ε protein on the localization of Cdc25B protein during the meiotic resumption of mouse oocytes, and to pay foundation for the further study on the molecular mechanism of 14-3-3εprotein in regulating the development of mouse oocytes. Methods:The Kunming genealology female mice aged 3 weeks were used to obtain the germinal vesicle (GV)-stage oocytes after superovulation. The GV-stage oocytes were divided into non-injection group,control siRNA injection group and 14-3-3ε siRNA injection group.The pmax-FP-Red-HA-14-3-3ε expression vector was constructed. Indirect immunofluorescence was used to observe the colocalization of 14-3-3ε protein and Cdc25B protein in the mouse oocytes; direct immunofluorescence was used to observe the subcellular localization of 14-3-3ε protein and Cdc25B protein in the mouse oocytes;14-3-3ε siRNA was microinjected into the GV-stage oocytes;the morphology was observed under phase-contrast microscope; the germinal vesicle breakdown(GVDB) rates of the mouse oocytes were calculated;the expression level of 14-3-3ε protein and the relative expression level of Cdc2-pTyr15 protein were observed by Western blotting method;the matuation-promoting factor (MPF) activity in the oocytes was measured by autoradiography. Results:The indirect immunofluorescence and direct immunofluorescence results showed that the 14-3-3ε protein and wild Cdc25B protein were co-localized in the cytoplasm; Cdc25B was translocated from the cytoplasm to the nucleus shortly before GVBD. When the Ser321 of Cdc25B protein turned into Ala, the expression level of 14-3-3ε protein was decreased. None of the oocytes in non-injection group and control siRNA injection group were able to undergo GVBD until at least 24 h after injection,there was no significant differences in the rate of GVBD between non-injection group and control siRNA injection group (P>0.05);the GVBD rates of oocytes in 14-3-3ε siRNA injection group at 22 and 24 h after injection were significantly higher than those in non-injection group and control siRNA injection group(P<0.01);the rate of oocytes progressed to metaphaseⅡ(MⅡ) in 14-3-3ε siRNA injection group at 24 h after injection was significantly higher than those in non-injection group and control siRNA injection group(P<0.01). Conclusion:Ser321 might be involved in the process of regulating the subcellular localization of Cdc25B by 14-3-3ε protein in the meiotic resumption of mouse oocytes.

Key words: 14-3-3ε, oocyte, subcellular localization, Cdc25B

中图分类号: 

  • Q954.43