ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2015, Vol. 46 ›› Issue (2): 279-287.doi: 10.11843/j.issn.0366-6964.2015.02.015

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Study on the Biological Characteristics of Three Attenuated Salmonella typhimurium Strains Harboring Porcine Epidemic Diarrhea Virus S Gene

LIANG En-tao1,CHEN Jie1,HUANG Xiao-bo1,2*,WEN Xin-tian1,2,CAO San-jie1,2,WU Xue-jing1,ZHU Shu-quan1   

  1. (1.Key Laboratory of Animal Disease and Human Health of Sichuan Province,College of Veterinary Medicine,Sichuan Agricultural University,Ya’an 625014,China;2.Laboratory of Zoonosis and Pig Disease Prevention Research Center,Sichuan Agricultural University,Chengdu 611130,China)
  • Received:2014-06-07 Online:2015-02-23 Published:2015-02-23

Abstract:

To explore the feasibility of attenuated Salmonella typhimurium as the carrier of porcine epidemic diarrhea virus (PEDV) S gene,the biological characteristics of three recombinant attenuated Salmonella strains harboring varying length of PEDV S gene were researched.The biological characteristics research of SL7207(pVAX-S499-650) (456 bp,encoding 499-650 amino acid of N-termanal S protein,SL7207(pVAX- S499-789) (873 bp,encoding 499-789 amino acid of N-termanal S protein),SL7207(pVAXD-S1-789) (2 367 bp,encoding 1-789 amino acid of N-termanal S protein) which harboring PEDV S genes in varying length plasmid DNA showed:SL7207(pVAX-S499-650),SL7207(pVAX-S499-789) and SL7207(pVAXD-S1-789) were steady in vivo/vitro;the target genes could be transcribed in the ileum tissue of mouse;recombinant strains could colonize in liver and spleen of mice and gradually eliminated by host;safety to BALB/c mouse at the dosage of 1×109 CFU by oral administration.All of this,demonstrating the attenuated S.typhimurium could be the carrier of PEDV S gene and laying the foundation for evaluating the immunogenicity of recombinant attenuated Salmonella strains in piglet.

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