ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (8): 1701-1708.doi: 10.11843/j.issn.0366-6964.2018.08.015

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Construction of Recombinant Adenovirus with Orf Virus F1L and B2L Genes and Analysis of Its Immune Efficacy in Mice

CHEN Xiao1,2,3, GE Lei1,3, DAI Jian-jun1,3*, LI Li2*, ZHANG De-fu1,3, WU Cai-feng1,3, ZHANG Shu-shan1,3   

  1. 1. Institute of Animal Science and Veterinary Medicine, Shanghai Academy of Agricultural Sciences, Shanghai 201106, China;
    2. College of Animal Husbandry & Veterinary, Jinzhou Medical University, Jinzhou 121001, China;
    3. Division of Animal Genetic Engineering, Shanghai Municipal Key Laboratory of Agri-genetics and Breeding, Shanghai 201106, China
  • Received:2018-01-19 Online:2018-08-23 Published:2018-08-23

Abstract:

The recombinant adenoviruses of orf virus (ORFV) was constructed by splicing F1L and B2L genes with the self-cut T2A and P2A peptide, and its immune effects were evaluated, which provided the basis for vaccine development of ORFV. The target genes of F1L and B2L from ORFV-F416 strain were amplified by PCR, and the recombinant adenovirus shuttle plasmid was constructed. The shuttle plasmid and backbone plasmid were co-transfected into HEK-293 cells and the ORFV recombinant adenovirus was packaged. The recombinant adenovirus was used to infect MDBK cells and the supernatant was collected to immunize ICR mice. Indirect ELISA, lymphocyte proliferation and ORFV challenge were conducted to evaluate the immunogenicity of mice. The results showed that pAV-CMV-F1L-T2A-B2L-P2A-EGFP recombinant adenovirus was successfully obtained, and its TCID50 was 10-5.375·mL-1. PCR and IFA results showed that the target gene was expressed both in gene and protein levels. After immunization with ORFV recombinant adenovirus, the antibody level of mice increased rapidly. ORFV recombinant adenovirus group showed much higher ability of T lymphocyte proliferation, which was significantly higher than that of PBS group (P<0.01). The results of this article showed that the recombinant adenovirus of F1L and B2L genes had positive protective effect in mice, which could stimulate humoral and cellular immune responses, and have no effects on feed intake.

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