畜牧兽医学报 ›› 2020, Vol. 51 ›› Issue (4): 754-762.doi: 10.11843/j.issn.0366-6964.2020.04.011

• 生物技术与繁殖 • 上一篇    下一篇

荣昌猪BMP15基因通过TGF-β RⅡ激活SMAD4信号分子机制研究

易华山1,2, 马鲜平1,2, 赵瑶1, 朱飘1, 刘骁1, 邓博远1, 吴昕炜1, 朱丹3, 崔燕4*   

  1. 1. 西南大学动物科学学院, 重庆 402460;
    2. 重庆市兽医科学工程研究中心, 重庆 402460;
    3. 重庆市畜牧科学院, 重庆 402460;
    4. 甘肃农业大学动物医学院, 兰州 730070
  • 收稿日期:2019-11-06 出版日期:2020-04-25 发布日期:2020-04-21
  • 通讯作者: 崔燕,主要从事基础兽医学研究,E-mail:cuiyan369@sina.com
  • 作者简介:易华山(1980-),男,甘肃临夏人,讲师,博士,主要从事兽医学研究,E-mail:dyxyihuashan@swu.edu.cn;马鲜平(1981-),女,甘肃文县人,讲师,硕士,主要从事基础兽医学研究,E-mail:xianpingma@163.com
  • 基金资助:
    中央高校基本科研业务专项基金(XDJK2018C059;XDJK2018C060);西南大学荣昌校区青年科学基金(20700949);重庆市基础研究与前沿探索专项项目基金(cstc2018jcyjAX0615)

Study on the Rongchang Pig BMP15 Gene through TGF-β RⅡ Activation SMAD4 Signal Molecular Mechanism

YI Huashan1,2, MA Xianping1,2, ZHAO Yao1, ZHU Piao1, LIU Xiao1, DENG Boyuan1, WU Xinwei1, ZHU Dan3, CUI Yan4*   

  1. 1. College of Animal Science, Southwest University, Chongqing 402460, China;
    2. Chongqing Veterinary Science Engineering Research Center, Chongqing 402460, China;
    3. Chongqing Academy of Animal Science, Chongqing 402460, China;
    4. College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
  • Received:2019-11-06 Online:2020-04-25 Published:2020-04-21

摘要: 本研究旨在阐明荣昌猪BMP15基因在荣昌猪性成熟前不同发育期的表达特性及其与SMADs信号相关基因的表达关系。采集1月龄、3月龄及5月龄荣昌猪卵巢组织,利用qRT-PCR及石蜡切片免疫荧光染色法分析荣昌猪不同月龄卵巢组织内BMP15基因表达及细胞定位特征;利用5月龄卵巢活组织添加重组人BMP15蛋白及TGF-β受体抑制剂(LY215799和LY2109761),应用qRT-PCR及Western blot方法分析BMP15及SMADs信号通路相关基因SMAD2、SMAD3、SMAD4、SMAD7、TGF-β1、TGF-β2、TGF-β3、TGF-β RⅠ和TGF-β RⅡ表达特征及BMP15/SMADs信号通路。结果表明:从1月龄至5月龄,随着荣昌猪生长发育,卵巢组织内BMP15基因mRNA表达量呈上调表达(P<0.05);石蜡切片免疫荧光试验表明,5月龄卵巢组织卵母细胞周围颗粒细胞内存在BMP15蛋白荧光信号;从3月龄至5月龄的卵巢组织内BMP15、SMAD4、TGF-β1及TGF-β RⅡ基因在mRNA水平呈上调表达(P<0.05),而SMAD2、TGF-β2及TGF-β RⅠ呈下调表达(P<0.05);通过5月龄卵巢活组织添加重组人BMP15蛋白、TGF-β RⅠ/Ⅱ及TGF-β RⅠ受体抑制剂培养,发现TGF-β RⅠ/Ⅱ抑制剂(LY2109761)明显抑制TGF-β RⅡ受体蛋白的表达,TGF-β RⅠ抑制剂(LY2157299)不能抑制TGF-β RⅡ受体蛋白的表达。上述结果表明,荣昌猪BMP15基因在荣昌猪性成熟前的卵巢组织内呈上调表达,SMAD4、TGF-β1及TGF-β RⅡ也呈上调表达。本试验研究表明BMP15基因通过TGF-β RⅡ介导SMAD4信号分子调控下游基因的表达,为进一步研究荣昌猪BMP15基因在卵泡发育中发挥的作用提供理论依据。

关键词: 荣昌猪, BMP15, SMAD, 卵母细胞, TGF-β

Abstract: In order to clarify BMP15 gene expression characteristics in Rongchang pigs at different developmental stages in relation to their sexual maturity, as well as the relationship between the expression of the BMP15 gene and SMADs signaling pathways genes, ovarian tissues from 1 month, 3 months, and 5 months old Rongchang pigs were collected to analyze different BMP15 gene expression and cellular localization characteristics in ovarian tissues of the Rongchang pigs at different developmental stages using qRT-PCR and paraffin sectioning methods. BMP15 and SMADs signaling pathways related genes SMAD2, SMAD3, SMAD4, SMAD7, TGF-β1, TGF-β2, TGF-β3, TGF-β RⅠ and TGF-β RⅡ expression characteristics were also revealed using qRT-PCR and Western blot analysis by adding recombinant human BMP15 protein and TGF-β receptor inhibitor (LY215799 and LY2109761) to 5-month-old ovarian biopsy. The results showed that from the age of 1 month to 5 months, the mRNA expression of BMP15 gene in ovarian tissues were up-regulated (P<0.05)with the growth and development of Rongchang pigs. Immunofluorescence and paraffin sectioning experiments showed that BMP15 protein fluorescent signals existd in granulosa cells surrounding oocyte in the 5-month-old ovarian tissues. Within the ovarian tissues, from 3-5 months old, BMP15, SMAD4, TGF-β1 and TGF-β RⅡ genes mRNA expressions were raised and SMAD2, TGF-β2 and TGF-β RⅠ expressions reduced (P<0.05). By adding the re combinant human BMP15 protein, TGF-β RⅠ/ Ⅱ and TGF-β RⅠ receptor inhibitor in the age of 5 months old ovarian biopsy, the results showed that TGF-β RⅠ/ Ⅱ receptor inhibitor (LY2109761) significantly inhibited the expression of TGF-β RⅡ proteins and TGF-β RⅠ receptor inhibitor (LY2157299) could not inhibit the expression of TGF-β RⅡ proteins. In conclusion, BMP15 gene expression before sexual maturity in Rongchang pig ovarian tissues were raised and SMAD4, TGF-β1 and TGF-β RⅡ genes expression were also up-regulated. The study illuminated that BMP15 gene mediated SMAD4 signaling molecules and regulated the downstream genes expression through TGF-β R Ⅱ, which provided theoretical basis for the further study of Rongchang pig BMP15 gene roles in the follicles development.

Key words: Rongchang pig, BMP15 gene, SMAD, oocyte, TGF-β

中图分类号: