Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Comparison of Immune Responses to the PCV2 Replicase-Capsid and Capsid Virus-Like Particle Vaccines in Mice

  • Jung, Bo-Kyoung (Department of Clinical Laboratory Science, Catholic University of Pusan) ;
  • Kim, Hye-Ran (Department of Clinical Laboratory Science, Catholic University of Pusan) ;
  • Lee, Young-Hyeon (Department of Clinical Laboratory Science, Catholic University of Pusan) ;
  • Jang, Hyun (WooGene B&G) ;
  • Chang, Kyung-Soo (Department of Clinical Laboratory Science, Catholic University of Pusan)
  • Received : 2018.09.17
  • Accepted : 2019.01.03
  • Published : 2019.03.28
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Abstract

Porcine circovirus type 2 (PCV2) is the causative agent of postweaning multisystemic wasting syndrome (PMWS) in pigs. Replicase (Rep) proteins are considered essential for viral replication. Capsid (Cap) protein is the primary immunogenic protein that induces protective immunity. Little is known about comparison on the immunogenicity of PCV2 Rep and Cap fusion protein and Cap protein. In the present study, recombinant baculoviruses expressing the Rep-Cap fusion protein (Bac-Rep-Cap) and the Cap protein (Bac-Cap) of PCV2 were constructed and confirmed with western blot and indirect fluorescence assay. Immunogenicities of the two recombinant proteins were tested in mice. The titers of antibodies were determined with a PCV2-specific enzyme-linked immunosorbent assay (ELISA) and a serum neutralization assay. The $IFN-{\gamma}$ response of immunized mice was measured by ELISA. The mice immunized with the Bac-Rep-Cap and Bac-Cap successfully produced Cap-specific immunoreaction. The mice immunized with the Bac-Cap developed higher PCV2-specific neutralizing antibody titers than mice injected with the Bac-Rep-Cap. $IFN-{\gamma}$ in the Bac-Rep-Cap group was increased compared to those in the Bac-Cap group. Vaccination of mice with the Bac-Rep-Cap showed significantly decreased protective efficacy compared to the Bac-Cap. Our findings will indubitably not only lead to a better understanding of the immunogenicity of PCV2, but also improved vaccines.

Keywords

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