ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2014, Vol. 45 ›› Issue (4): 621-630.doi: 10.11843/j.issn.0366-6964.2014.04.017

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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

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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