title: Recombinant adenovirus expressing GP5 and M fusion proteins of porcine reproductive and respiratory syndrome virus induce both humoral and cell-mediated immune responses in mice.
abstract: Porcine reproductive and respiratory syndrome virus (PRRSV) is one of the most important contagious agents of swine in the world. PRRSV infection poses a challenge to current vaccination strategies. In this study, three replication-defective adenovirus recombinants were developed as potential vaccine against PRRSV in a mouse model. Three groups of BALB/c mice (24 mice per group) were inoculated subcutaneously twice at 2-week intervals with the recombinants expressing PRRSV GP5 (rAd-GP5), M (rAd-M), and M-GP5 fusion protein (rAd-M-GP5). Two additional groups were injected with wild-type adenovirus (wtAd) or PBS as control. The results showed that the mice inoculated with recombinant adenoviruses developed PRRSV-specific antibodies, cellular immune response by 2 weeks post second inoculation. However, only mice immunized with recombinant adenovirus rAd-M-GP5 developed significantly higher titers of neutralizing antibodies to PRRSV and produced stronger lymphocyte proliferation responses compared to mice immunized with rAd-M or rAd-GP5 alone. It was also found that mice immunized with rAd-M-GP5 were primed for significant higher levels of anti-PRRSV CTL responses than mice immunized with rAd-M. Mice receiving rAd-GP5 also mounted PRRSV-specific response, but levels were lower. It suggested that the recombinant adenovirus expressing M-GP5 fusion protein might be an attractive candidate vaccine to be tested for preventing PRRSV infection.
authors.affiliation: Key Laboratory of Animal Diseases Diagnostic and Immunology, College of Veterinary Medicine, Nanjing Agricultural University, Ministry of Agriculture, Nanjing 210095, China.
authors.forename: Wenming
authors.initials: W
authors.lastname: Jiang
authors.forename: Ping
authors.initials: P
authors.lastname: Jiang
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Li
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Tang
authors.forename: Xianwei
authors.initials: X
authors.lastname: Wang
authors.forename: Su
authors.initials: S
authors.lastname: Ma
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D004279:DNA, Viral / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay / Q000662:veterinary; D005260:Female; D005822:Genetic Vectors; D051379:Mice; D008807:Mice, Inbred BALB C; D041681:NIH 3T3 Cells; D009500:Neutralization Tests / Q000662:veterinary; D016133:Polymerase Chain Reaction / Q000662:veterinary; D019318:Porcine Reproductive and Respiratory Syndrome / Q000276:immunology* / Q000517:prevention & control; D019316:Porcine respiratory and reproductive syndrome virus / Q000235:genetics / Q000276:immunology*; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology; D013552:Swine; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014611:Vaccination / Q000379:methods / Q000662:veterinary; D014759:Viral Envelope Proteins / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D014763:Viral Matrix Proteins / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D014765:Viral Vaccines / Q000235:genetics / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D004279:DNA, Viral; D011993:Recombinant Fusion Proteins; D014759:Viral Envelope Proteins; D014763:Viral Matrix Proteins; D014765:Viral Vaccines; C114789:glycoprotein 5, PRRSV