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Liu Z, Liu Y, Zhang Y, Yang Y, Ren J, Zhang X, Du E. Surface displaying of swine IgG1 Fc enhances baculovirus-vectored vaccine efficacy by facilitating viral complement escape and mammalian cell transduction. Vet Res 2017; 48:29. [PMID: 28499403 PMCID: PMC5429525 DOI: 10.1186/s13567-017-0434-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 04/04/2017] [Indexed: 01/23/2023] Open
Abstract
Baculovirus-mediated gene transfer has been developed as a vaccine design strategy against a number of diseases without apparent viral replication. However, it has been hampered by complement-dependent inactivation, thus hindering the in vivo application of baculovirus. A variety of approaches have been exploited to bypass the complement system in the serum. In this study, we constructed and screened a series of baculovirus vectors displaying complement interfering factors, of which a baculovirus vector displaying swine IgG1 Fc (pFc) showed the highest complement antagonism (75.6%). Flow cytometry analysis of transduced cells demonstrated that the baculovirus display of pFc had a significant increase in transduction efficiency and transgene expression of reporter genes. On this basis, a VSV-G-pseudotyped with swine IgG1 Fc surface displayed baculovirus vector was developed to express the classical swine fever virus (CSFV) E2 gene. The translational enhancers Syn21 and P10UTR were incorporated to improve the antigen expression. The E2 gene was efficiently expressed in both insect and mammalian cells. Pigs immunized with this recombinant baculovirus developed high levels of E2-specific antibody, CSFV-specific neutralizing antibody and IFN-γ-secreting cellular immune responses. These results demonstrate that the strategy of surface-displaying swine IgG1 Fc has a great potential to improve the efficiency of baculovirus-vectored vaccine for CSFV and other swine pathogens.
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Affiliation(s)
- Zehui Liu
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Yangkun Liu
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Yuanyuan Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Yajuan Yang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Jingjing Ren
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Xiaoying Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
| | - Enqi Du
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
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