畜牧与饲料科学 ›› 2022, Vol. 43 ›› Issue (5): 1-6.doi: 10.12160/j.issn.1672-5190.2022.05.001

• 基础研究 •    下一篇

绵羊梅迪-维斯纳病毒CA蛋白可溶性表达、多克隆抗体制备及鉴定

李慧萍1,2,3,陈思旭1,2,3,张良1,2,3,史晓娜1,2,3,刘淑英1,2,3   

  1. 1.内蒙古农业大学兽医学院,内蒙古 呼和浩特 010018
    2.农业农村部动物疾病临床诊疗技术重点实验室,内蒙古 呼和浩特 010018
    3.内蒙古自治区基础兽医学重点实验室,内蒙古 呼和浩特 010018
  • 收稿日期:2022-05-06 出版日期:2022-09-30 发布日期:2022-09-21
  • 通讯作者: 刘淑英(1968—),女,教授,博士,博士生导师,主要研究方向为动物病毒病理学。
  • 作者简介:李慧萍(1985—),女,实验师,硕士,主要研究方向为羊病毒性传染病病原检测。
  • 基金资助:
    国家自然科学基金面上项目(32072819);内蒙古科技重大专项计划项目(2021ZD0010);内蒙古应用研究项目(2019GG240);内蒙古草原英才创新团队项目(20151031)

Soluble Expression of CA Protein of Maedi-visna Virus of Sheep Origin and Preparation and Identification of Its Polyclonal Antibody

LI Hui-ping1,2,3,CHEN Si-xu1,2,3,ZHANG Liang1,2,3,SHI Xiao-na1,2,3,LIU Shu-ying1,2,3   

  1. 1. College of Veterinary Medicine,Inner Mongolia Agricultural University,Hohhot 010018,China
    2. Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Disease,Ministry of Agriculture and Rural Affairs,Hohhot 010018,China
    3. Inner Mongolia Key Laboratory of Basic Veterinary Science,Hohhot 010018,China
  • Received:2022-05-06 Online:2022-09-30 Published:2022-09-21

摘要:

[目的]制备绵羊梅迪-维斯纳病毒(maedi-visna virus,MVV)衣壳蛋白(capsid protein,CA)多克隆抗体,并鉴定其特异性。[方法]根据MVV内蒙古分离株CA基因序列设计特异性引物,扩增CA基因,构建重组质粒;对 CA重组蛋白进行原核表达及纯化,制备兔源MVV CA重组蛋白多克隆抗体,采用间接ELISA方法测定其抗体效价,利用Western blot和免疫组化方法对其进行特异性鉴定。[结果]成功构建MVV CA重组蛋白原核表达系统,纯化后的目的蛋白大小约27 kDa;间接ELISA方法测定制备的多克隆抗体效价为1∶8 192;Western blot检测感染MVV绵羊的病肺组织,在25 kDa处出现特异性条带;免疫组化结果显示感染MVV绵羊的病肺中巨噬细胞的胞浆内有明显棕黄色阳性信号。[结论]利用获得的可溶性重组MVV CA蛋白制备的多克隆抗体具有较好特异性,可为MVV血清学诊断技术提供检测抗体。

关键词: 绵羊, 梅迪-维斯纳病毒, 衣壳蛋白, 原核表达, 多克隆抗体

Abstract:

[Objective] The aims of this study were to prepare the polyclonal antibody against capsid (CA) protein of a maedi-visna virus (MVV) strain isolated from naturally infected sheep and to assess its specificity. [Method] A set of specific primers was designed according to the CA gene sequence of MVV Inner Mongolia strain, and the CA gene was subsequently amplified by PCR assay for constructing a recombinant plasmid. The MVV CA recombinant protein was prokaryotically expressed and purified. The rabbit-derived polyclonal antibody against MVV CA recombinant protein was prepared, and its titer and specificity were determined and identified by using indirect ELISA assay as well as Western blot and immunohistochemical analyses. [Result] The prokaryotic expression system of MVV CA recombinant protein was successfully constructed, and the target protein was about 27 kDa after purification. The titer of the prepared polyclonal antibody was determined as 1∶8 192 by indirect ELISA assay. Western blot analysis showed that there was a specific band with a size of 25 kDa in lung tissues of sheep infected with MVV. Immunohistochemical analysis demonstrated that there were obvious brownish yellow positive signals in cytoplasm of macrophages in lung tissues of sheep infected with MVV. [Conclusion] Polyclonal antibody prepared with soluble recombinant MVV CA protein had good specificity, which might serve as a candidate antibody in MVV serological diagnosis technology.

Key words: sheep, maedi-visna virus, capsid protein, prokaryotic expression, polyclonal antibody

中图分类号: