Displaying epitope B and epitope 7 of porcine reproductive and respiratory syndrome virus on virus like particles of porcine circovirus type 2 provides partial protection to pigs

• Published in: Journal of veterinary medical science 2021-07, Vol.83 (8), p.1263-1272
• Main Authors: LI, Guopan, LIU, Lei, XU, Baojuan, HU, Jixiong, KUANG, Hongyan, WANG, Xi, WANG, Liping, CUI, Xiaoxia, SUN, Houmin, RONG, Jun
• Format: Article
• Language: English
• Subjects: Virology
• ISSN: 0916-7250; 1347-7439
• DOI: 10.1292/jvms.21-0543

The Cap of porcine circovirus type 2 (PCV2) can be assembled into virus like particles (VLPs) in vitro that have multiple loops located on the particle surface. This would make it a good vehicle for displaying exogenous proteins or epitopes. We derived two epitopes, epitope B (EpB, S 37 HIQLIYNL 45 ) and epitope 7 (Ep7, Q 196 WGRL 200 ) from Gp5 of the highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV). We replaced the core region of Loop CD (L 75 PPGGGSN 82 ) and the carboxyl terminus (K 222 DPPL 226 ) of PCV2 Cap, respectively, to construct a bi-epitope chimeric PCV2 Cap. Its immunogenicity and protective effects were evaluated as one PRRSV subunit vaccine. The chimeric PCV2 Cap was soluble, efficiently expressed in an Escherichia coli expression system, and could be self-assembled into chimeric virus like particles (cVLPs) with a diameter of 12–15 nm. Western blotting confirmed that the cVLPs could be specifically recognized by anti-PCV2, anti-EpB and anti-Ep7 antibodies. The cVLPs vaccine could alleviate the clinical symptoms and reduce the viral loads after HP-PRRSV challenge in 100–120 days old pigs. These data suggest that the cVLPs vaccine could provide pigs with partial protection against homologous PRRSV strains, and it provides a new design for additional PRRSV subunit vaccines.