畜牧兽医学报 ›› 2014, Vol. 45 ›› Issue (4): 621-630.doi: 10.11843/j.issn.0366-6964.2014.04.017

• 预防兽医 • 上一篇    下一篇

副猪嗜血杆菌SC-1株荚膜多糖输出蛋白的表达及其免疫原性分析

张飞1,都启晶1,张洋溢1,文心田1,2,3*,黄小波1,2,3,曹三杰1,2,3   

  1. (1.四川农业大学预防兽医研究所猪病研究中心,雅安 625014;2.四川农业大学动物医学院人兽共患病研究室,成都 611130;3.农业部兽用药物与兽医生物技术四川科学观测实验站,雅安 625014)
  • 收稿日期:2013-09-09 出版日期:2014-04-23 发布日期:2014-04-23
  • 通讯作者: 文心田,E-mail:xintian@sicau.edu.cn
  • 作者简介:张飞(1987-),男,河南尉氏人,硕士,主要从事动物传染病的研究工作,E-mail:zhf19861016@126.com
  • 基金资助:

    公益性行业(农业)科研专项(201303034-1)

Expression and Immunogenicity Analysis of Capsular Polysaccharide Export Protein of Haemophilus parasuis SC-1 Isolate

ZHANG Fei1,DU Qi-jing1,ZHANG Yang-yi1,WEN Xin-tian1,2,3*,HUANG Xiao-bo1,2,3,CAO San-jie1,2,3   

  1. (1.Swine Research Center,Institute of Preventive Veterinary Medicine,Sichuan Agricultural University,Ya’an 625014, China; 2.Laboratory of Zoonosi,College of Veterinary Medicine,Sichuan Agricutural University,Chengdu 611130, China; 3.Sichuan Science-observation Experiment of Veterinary Drugs and Veterinary Biological Technology of Ministry of Agriculture,Ya’an 625014, China)
  • Received:2013-09-09 Online:2014-04-23 Published:2014-04-23

摘要:

运用PCR方法扩增副猪嗜血杆菌SC-1株荚膜多糖输出蛋白(CPEP)基因,克隆至pMD-19T载体。经鉴定测序验证后,将获得的CPEP基因克隆至pET-32a(+)原核表达载体,构建原核表达质粒pET-32a-CPEP,转化大肠杆菌BL21(DE3),IPTG诱导表达,进行SDS-PAGE以及Western blot分析免疫原性,纯化CPEP,并用纯化的蛋白免疫小鼠,检测其特异性血清IgG抗体水平及攻毒保护率。结果显示,成功构建原核表达质粒pET-32a-CPEP;SDS-PAGE分析结果显示,得到约35 ku的蛋白;Western blot分析显示,CPEP能与Hps SC-1阳性血清发生抗原抗体的特异性反应,证实该重组CPEP蛋白具有反应原性。以致死剂量的强毒株SC-1攻毒CPEP免疫小鼠,重组蛋白的免疫能够减缓发病,并表现出40%的保护率。重组蛋白CPEP的部分保护作用表明其可以作为免疫候选因子,为未来副猪嗜血杆菌标准化疫苗的研制奠定基础。

Abstract:

Capsular polysaccharide export protein (CPEP) gene of Haemophilus parasuis SC-1 was amplified by PCR and then was cloned into the pMD-19T vector.After being certified by sequence and digestion with BamHⅠand XhoⅠ respectively,the gene were cloned into the pET-32a(+) vector.The recombinant vector was transformed into BL21(DE3)and then induced by IPTG.The product of expression was studied by SDS-PAGE and Western blot,and then was purified.We further evaluated the immune responses and protective efficacy of purified CPEP in mice models.The results showed that the recombinant vector pET32a-CPEP was constructed successfully.The SDS-PAGE and the western blot results showed that the purified protein was 35 kDa and the recombinant CPEP possessed reactogenicity respectively.The protective capacity of the anti-CPEP antibodies was evaluated by the inoculation of highly virulent strain SC-1.Vaccinated animals had a delayed course of disease and 40% of the animals survived the lethal challenge.The partial protection achieved with the recombinant CPEP supports their potential as candidates to be included in future vaccine formulations against H.parasuis.

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