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Tao LN, Liu ZH, Xu HL, Lu Y, Liao M, He F. LvYY1 Activates WSSV ie1 Promoter for Enhanced Vaccine Production and Efficacy. Vaccines (Basel) 2020; 8:E510. [PMID: 32911686 PMCID: PMC7563808 DOI: 10.3390/vaccines8030510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 08/26/2020] [Accepted: 09/04/2020] [Indexed: 12/14/2022] Open
Abstract
The baculovirus expression vector system (BEVS) has been used as a preferred platform for the production of recombinant protein complexes and efficacious vaccines. However, limited protein yield hinders the application of BEVS. It is well accepted that transcription enhancers are capable of increasing translational efficiency of mRNAs, thereby achieving better protein production. In this study, the ability of LvYY1 as a transcription enhancer was assessed. LvYY1 could interact with the WSSV ie1 promoter via binding to special DNA sites in BEVS. The effects of LvYY1 on protein expression mediated by WSSV ie1 promoter of BEVS was investigated using eGFP as a reporter gene. Enhanced eGFP expression was observed in Sf-9 cells with LvYY1. On this basis, a modified vector combining ie1 promoter and LvYY1 was developed to express either secreting CSFV E2 or baculovirus surface displayed H5 HA of AIVs. Compared to control groups without LvYY1, E2 protein yield increases to 1.6-fold, while H5 production improves as revealed by an upregulated hemagglutination titer of 8-fold at least. Moreover, with LvYY1, H5 displaying baculovirus driven by WSSV ie1 promoter (BV-LvYY1-ie1-HA) sustains the transduction activity in CEF cells. In chicken, BV-LvYY1-ie1-HA elicits a robust immune response against H5 AIVs in the absence of adjuvant, as indicated by specific antibody and cytokine responses. The findings suggest its potential function as both a vectored and subunit vaccine. These results demonstrate that the coexpression with LvYY1 serves as a promising strategy to extensively improve the efficiency of BEVS for efficacious vaccine production.
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Affiliation(s)
- Li-Na Tao
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China; (L.-N.T.); (Z.-H.L.); (H.-L.X.); (Y.L.)
| | - Ze-Hui Liu
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China; (L.-N.T.); (Z.-H.L.); (H.-L.X.); (Y.L.)
| | - Hui-Ling Xu
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China; (L.-N.T.); (Z.-H.L.); (H.-L.X.); (Y.L.)
| | - Ying Lu
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China; (L.-N.T.); (Z.-H.L.); (H.-L.X.); (Y.L.)
| | - Min Liao
- Key Laboratory of Animal Virology of Ministry of Agriculture, Zhejiang University, Hangzhou 310058, China;
| | - Fang He
- Institute of Preventive Veterinary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China; (L.-N.T.); (Z.-H.L.); (H.-L.X.); (Y.L.)
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Tran HTT, Truong DA, Ly VD, Vu HT, Hoang TV, Nguyen CT, Chu NT, Nguyen VT, Nguyen DT, Miyazawa K, Kokuho T, Dang HV. The potential efficacy of the E2-subunit vaccine to protect pigs against different genotypes of classical swine fever virus circulating in Vietnam. Clin Exp Vaccine Res 2020; 9:26-39. [PMID: 32095438 PMCID: PMC7024730 DOI: 10.7774/cevr.2020.9.1.26] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 01/19/2020] [Accepted: 01/21/2020] [Indexed: 11/15/2022] Open
Abstract
Purpose To date, many kinds of classical swine fever (CSF) vaccines have been developed to protect against this disease. However, the efficacy of these vaccines to protect the pig against field CSF strains needs to be considered, based on circulating strains of classical swine fever virus (CSFV). Materials and Methods Recombinant E2-CSFV protein produced by baculovirus/insect cell system was analyzed by western blots and immunoperoxidase monolayer assay. The effect of CSFV-E2 subunit vaccines was evaluated in experimental pigs with three genotypes of CSFV challenge. Anti-E2 specific and neutralizing antibodies in experimental pigs were analyzed by blocking enzyme-linked immunosorbent assay and neutralization peroxidize-linked assay. Results The data showed that CSFV VN91-E2 subunit vaccine provided clinical protection in pigs against three different genotypes of CSFV without noticeable clinical signs, symptoms, and mortality. In addition, no CSFV was isolated from the spleen of the vaccinated pigs. However, the unvaccinated pigs exhibited high clinical scores and the successful virus isolation from spleen. These results showed that the E2-specific and neutralizing antibodies induced by VN91-E2 antigen appeared at day 24 after first boost and a significant increase was observed at day 28 (p<0.01). This response reached a peak at day 35 and continued until day 63 when compared to controls. Importantly, VN91-E2 induced E2-specific and neutralizing antibodies protected experimental pigs against high virulence of CSFVs circulating in Vietnam, including genotype 1.1, 2.1, and 2.2. Conclusion These findings also suggested that CSFV VN91-E2 subunit vaccine could be a promising vaccine candidate for the control and prevention of CSFV in Vietnam.
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Affiliation(s)
- Ha Thi Thanh Tran
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Duc Anh Truong
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Viet Duc Ly
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Hao Thi Vu
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Tuan Van Hoang
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Chinh Thi Nguyen
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Nhu Thi Chu
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Vinh The Nguyen
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Duyen Thuy Nguyen
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
| | - Kohtaro Miyazawa
- National Institute of Animal Health, The National Agriculture and Food Research Organization, Tsukuba, Japan
| | - Takehiro Kokuho
- National Institute of Animal Health, The National Agriculture and Food Research Organization, Tsukuba, Japan
| | - Hoang Vu Dang
- Department of Biochemistry and Immunology, National Institute of Veterinary Research (NIVR), Hanoi, Vietnam
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Lim SI, Choe S, Kim KS, Jeoung HY, Cha RM, Park GS, Shin J, Park GN, Cho IS, Song JY, Hyun BH, Park BK, An DJ. Assessment of the efficacy of an attenuated live marker classical swine fever vaccine (Flc-LOM-BE rns) in pregnant sows. Vaccine 2019; 37:3598-3604. [PMID: 31151802 DOI: 10.1016/j.vaccine.2019.04.076] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 04/20/2019] [Accepted: 04/24/2019] [Indexed: 11/29/2022]
Abstract
Here, we constructed an attenuated live marker classical swine fever (CSF) vaccine (Flc-LOM-BErns) to eradicate CSF. This was done by taking infectious clone Flc-LOM, which is based on an attenuated live CSF vaccine virus (LOM strain), and removing the full-length classical swine fever virus (CSFV) Erns sequences and the 3' end (52 base pairs) of the CSFV capsid. These regions were substituted with the full-length bovine viral diarrhoea virus (BVDV) Erns gene sequence and the 3' end (52 base pairs) of the BVDV capsid gene. Sows were vaccinated with the Flc-LOM-BErns vaccine 3 weeks before insemination and then challenged with virulent CSFV at the early, mid- or late stages of pregnancy. We then examined transplacental transmission to the foetuses. Piglets born to sows vaccinated with Flc-LOM-BErns did not show vertical infection, regardless of challenge time. In addition, CSFV challenge did not affect the delivery date, weight or length of the foetus. Pregnant sows inoculated with the Flc-LOM-BErns vaccine were anti-CSF Erns antibody-negative and anti-BVDV Erns antibody-positive. Challenge of pregnant sows with virulent CSFV resulted in anti-CSF Erns antibody positivity. These results strongly indicate that differential diagnosis can be conducted between the Flc-LOM-BErns vaccinated animal and virulent CSFV affected animal by detecting antibody against BVDV Erns or CSF Erns gene. Therefore, the Flc-LOM-BErns vaccine may fulfil the function of differential diagnosis which required for DIVA vaccine.
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Affiliation(s)
- Seong-In Lim
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - SeEun Choe
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Ki-Sun Kim
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Hye-Young Jeoung
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Ra Mi Cha
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Gil-Soon Park
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Jihye Shin
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Gyu-Nam Park
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - In-Soo Cho
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Jae-Young Song
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Bang-Hun Hyun
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea
| | - Bong-Kyun Park
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea; College of Veterinary Medicine, Seoul University, Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea
| | - Dong-Jun An
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do, 39660, South Korea.
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