Vaccination of Mice with < b > < i > Listeria ivanovii < /i > < /b > Expressing the Truncated M Protein of Porcine Reproductive and Respiratory Syndrome Virus Induces both Antigen-Specific CD4+ and CD8+ T Cell-Mediated Immunity

In this study, a part of the PRRSVORF6 gene (from 253 to 519 bp) encoding the hydrophilic domain of PRRSV M protein was integrated into twoListeria strains via homologous recombination to generate two PRRS vaccine candidates, namely LI-M ’ and LM-ΔactAplcB-M ’. Both candidate vaccines showed similar growth rate as their parent strains in culture media, but presented different bacterial loads in target organs. As the integrated heterogenous gene was not expressed, LM-ΔactAplcB-M ’ was excluded from the immunological test. In a mouse model, LI-M’ provoked both CD4+ and CD8+ T cell-mediated immunity. In addition, LI-M’ boosting dramatically enhanced CD8+ T cell-mediated immunity without affecting the response intensity of CD4+ T cell-mediated immunity. All of these data suggest that LI-M’ is a promising PRRS vaccine candidate.J Mol Microbiol Biotechnol
Source: Journal of Molecular Microbiology and Biotechnology - Category: Microbiology Source Type: research