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Hsu CY, Jang Y, Huang WR, Wang CY, Wen HW, Tsai PC, Yang CY, Munir M, Liu HJ. Development of Polycistronic Baculovirus Surface Display Vectors to Simultaneously Express Viral Proteins of Porcine Reproductive and Respiratory Syndrome and Analysis of Their Immunogenicity in Swine. Vaccines (Basel) 2023; 11:1666. [PMID: 38005998 PMCID: PMC10674950 DOI: 10.3390/vaccines11111666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 10/21/2023] [Accepted: 10/30/2023] [Indexed: 11/26/2023] Open
Abstract
To simultaneously express and improve expression levels of multiple viral proteins of a porcine reproductive and respiratory syndrome virus (PRRSV), polycistronic baculovirus surface display vectors were constructed and characterized. We engineered polycistronic baculovirus surface display vectors, namely, pBacDual Display EGFP(BacDD)-2GP2-2GP4 and pBacDD-4GP5N34A/N51A (mtGP5), which simultaneously express and display the ectodomain of His-tagged GP2-gp64TM-CTD, His-tagged GP4-gp64TM-CTD, and His-tagged mtGP5-gp64TM-CTD fusion proteins of PRRSV on cell membrane of Sf-9 cells. Specific pathogen-free (SPF) pigs were administered intramuscularly in 2 doses at 21 and 35 days of age with genetic recombinant baculoviruses-infected cells. Our results revealed a high level of ELISA-specific antibodies, neutralizing antibodies, IL-4, and IFN-γ in SPF pigs immunized with the developed PRRSV subunit vaccine. To further assess the co-expression efficiency of different gene combinations, pBacDD-GP2-GP3-2GP4 and pBacDD-2mtGP5-2M constructs were designed for the co-expression of the ectodomain of His-tagged GP2-gp64TM-CTD, His-tagged GP3-gp64TM-CTD, and His-tagged GP4-gp64TM-CTD proteins as well as the ectodomain of His-tagged mtGP5-gp64TM-CTD and His-tagged M-gp64TM-CTD fusion proteins of PRRSV. To develop an ELISA assay for detecting antibodies against PRRSV proteins, the sequences encoding the ectodomain of the GP2, GP3, GP4, mtGP5, and M of PRRSV were amplified and subcloned into the pET32a vector and expressed in E. coli. In this work, the optimum conditions for expressing PRRSV proteins were evaluated, and the results suggested that 4 × 105 of Sf-9 cells supplemented with 7% fetal bovine serum and infected with the recombinant baculoviruses at an MOI of 20 for three days showed a higher expression levels of the protein. Taken together, the polycistronic baculovirus surface display system is a useful tool to increase expression levels of viral proteins and to simultaneously express multiple viral proteins of PRRSV for the preparation of subunit vaccines.
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Affiliation(s)
- Chao-Yu Hsu
- Department of Medical Research, Tungs’ Taichung Metroharbor Hospital, Taichung 435, Taiwan;
- Ph.D. Program in Translational Medicine, National Chung Hsing University, Taichung 402, Taiwan
| | - Yun Jang
- Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan; (Y.J.); (W.-R.H.)
| | - Wei-Ru Huang
- Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan; (Y.J.); (W.-R.H.)
- The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung 402, Taiwan
| | - Chi-Young Wang
- Department of Veterinary Medicine, National Chung Hsing University, Taichung 402, Taiwan;
| | - Hsiao-Wei Wen
- Department of Food Science and Biotechnology, National Chung Hsing University, Taichung 402, Taiwan;
| | - Pei-Chien Tsai
- Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan;
| | - Cheng-Yao Yang
- Graduate Institute of Veterinary Pathobiology, National Chung Hsing University, Taichung 402, Taiwan;
| | - Muhammad Munir
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, Lancaster LA1 4YW, UK;
| | - Hung-Jen Liu
- Ph.D. Program in Translational Medicine, National Chung Hsing University, Taichung 402, Taiwan
- Institute of Molecular Biology, National Chung Hsing University, Taichung 402, Taiwan; (Y.J.); (W.-R.H.)
- The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung 402, Taiwan
- Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan;
- Rong Hsing Research Center for Translational Medicine, National Chung Hsing University, Taichung 402, Taiwan
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