1
|
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.
Collapse
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
| |
Collapse
|
2
|
Chen YY, Yang WC, Chang YK, Wang CY, Huang WR, Li JY, Chuang KP, Wu HY, Chang CD, Nielsen BL, Liu HJ. Construction of polycistronic baculovirus surface display vectors to express the PCV2 Cap(d41) protein and analysis of its immunogenicity in mice and swine. Vet Res 2020; 51:112. [PMID: 32907618 PMCID: PMC7487469 DOI: 10.1186/s13567-020-00836-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 08/27/2020] [Indexed: 11/22/2022] Open
Abstract
To increase expression levels of the PCV2 Cap(d41) protein, novel baculovirus surface display vectors with multiple expression cassettes were constructed to create recombinant baculoviruses BacSC-Cap(d41), BacDD-2Cap(d41), BacDD-3Cap(d41), and BacDD-4Cap(d41). Our results reveal that the recombinant baculovirus BacDD-4Cap(d41) was able to express the highest levels of Cap(d41) protein. Optimum conditions for expressing the PCV2 Cap(d41) protein were determined, and our results show that 107 of Sf-9 infected with the recombinant baculovirus BacDD-4Cap(d41) at an MOI of 5 for 3 days showed the highest level of protein expression. Mice immunized with the 4Cap(d41) vaccine which was prepared from the recombinant baculovirus-infected cells (107) elicited higher ELISA titers compared to the Cap (d41) vaccine. The 4Cap(d41) vaccine could elicit anti-PCV2 neutralizing antibodies and IFN-γ in mice, as confirmed by virus neutralization test and IFN-γ ELISA. Moreover, the swine lymphocyte proliferative responses indicated that the 4Cap(d41) vaccine was able to induce a clear cellular immune response. Flow cytometry analysis showed that the percentage of CD4+ T cells and CD4+/CD8+ ratio was increased significantly in SPF pigs immunized with the 4Cap(d41) vaccine. Importantly, the 4Cap(d41) vaccine induced an IFN-γ response, further confirming that its effect is through cellular immunity in SPF pigs. An in vivo challenge study revealed that the 4Cap(d41) and the commercial vaccine groups significantly reduce the viral load of vaccinated pigs as compared with the CE negative control group. Taken together, we have successfully developed a 4Cap(d41) vaccine that may be a potential subunit vaccine for preventing the disease associated with PCV2 infections.
Collapse
Affiliation(s)
- Ya-Yi Chen
- Department of Stomatology, Tung's Taichung MetroHarbor Hospital, Taichung, Taiwan
- Medical Biotechnology, National Chung Hsing University, Taichung, 402, Taiwan
| | - Wei-Chen Yang
- Institute of Molecular Biology, National Chung Hsing University, Taichung, 402, Taiwan
| | - Yu-Kang Chang
- Department of Medical Research, Tung's Taichung MetroHarbor Hospital, Taichung, Taiwan
- Department of Nursing, Jen-Teh Junior College of Medicine and Management, Hou-Long, Taiwan
| | - Chi-Young Wang
- Department of Veterinary Medicine, National Chung Hsing University, Taichung, 402, Taiwan
| | - Wei-Ru Huang
- Institute of Molecular Biology, National Chung Hsing University, Taichung, 402, Taiwan
- The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung, 402, Taiwan
| | - Jyun-Yi Li
- Institute of Molecular Biology, National Chung Hsing University, Taichung, 402, Taiwan
- The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung, 402, Taiwan
| | - Kuo-Pin Chuang
- Graduate Institute of Animal Vaccine Technology, National Pingtung University of Science and Technology, Pingtung, 912, Taiwan
| | - Hung-Yi Wu
- Department of Veterinary Medicine, National Pingtung University of Science and Technology, Pingtung, 912, Taiwan
| | - Ching-Dong Chang
- Department of Veterinary Medicine, National Pingtung University of Science and Technology, Pingtung, 912, Taiwan
| | - Brent L Nielsen
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - Hung-Jen Liu
- Institute of Molecular Biology, National Chung Hsing University, Taichung, 402, Taiwan.
- The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung, 402, Taiwan.
- Rong Hsing Research Center for Translational Medicine, National Chung Hsing University, Taichung, 402, Taiwan.
- Translational Medicine, National Chung Hsing University, Taichung, 402, Taiwan.
- Department of Life Sciences, National Chung Hsing University, Taichung, Taiwan.
| |
Collapse
|