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Zeng L, Bai J, Huang J, Huang S, Qin Y, Yin Y, Chen Y, Wei Z, Huang W, Ouyang K. Construction and preliminary immunological evaluation of EV-G replicon expressing PEDV-COE-N region. Virology 2025; 604:110436. [PMID: 39889482 DOI: 10.1016/j.virol.2025.110436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2024] [Revised: 01/14/2025] [Accepted: 01/23/2025] [Indexed: 02/03/2025]
Abstract
Porcine epidemic diarrhea virus (PEDV) is a highly contagious virus that causes acute infectious disease in swine, with mortality rates in piglets reaching up to 100%. In recent years, PEDV has led to significant economic losses in China's pig industry. As there is no specific treatment for PEDV, vaccination remains a key strategy for its prevention and control. This study utilized the EV-G replicon system to develop a nucleic acid vaccine expressing the PEDV core neutralizing epitope (COE) region, which was evaluated through immunization of Kunming mice. The results demonstrated that the vaccine successfully induced high levels of specific IgG and neutralizing antibodies in the mice, while also significantly enhanced splenic lymphocyte proliferation, and increased the expression of IL-4 and IFN-γ cytokines. These findings indicate that the constructed pBluescript-EV-G-COE-N plasmid is an effective DNA replicon vaccine. Notably, immunized with pBluescript-EV-G-COE-N replicons with chitosan resulted in higher neutralizing antibodies and IFN-γ, suggesting the enhanced immune efficacy. The successful construction and preliminary immunological evaluation of the pBluescript-EV-G-COE-N replicon highlights its potential in PEDV vaccine development and offers valuable data for future research in new PEDV vaccine formulations.
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Affiliation(s)
- Lingyou Zeng
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China.
| | - Jiaguo Bai
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China.
| | - Jiabao Huang
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China.
| | - Shiting Huang
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China.
| | - Yifeng Qin
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China; Guangxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning, 530005, China; Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning, 530005, China.
| | - Yeshi Yin
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China; Guangxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning, 530005, China; Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning, 530005, China.
| | - Ying Chen
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China; Guangxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning, 530005, China; Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning, 530005, China.
| | - Zuzhang Wei
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China; Guangxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning, 530005, China; Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning, 530005, China.
| | - Weijian Huang
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China; Guangxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning, 530005, China; Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning, 530005, China.
| | - Kang Ouyang
- Laboratory of Animal Infectious Diseases and Molecular Immunology, College of Animal Science and Technology, Guangxi University, Nanning, 30005, China; Guangxi Zhuang Autonomous Region Engineering Research Center of Veterinary Biologics, Nanning, 530005, China; Guangxi Key Laboratory of Animal Breeding, Disease Control and Prevention, Nanning, 530005, China.
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Li X, Wu Y, Yan Z, Li G, Luo J, Huang S, Guo X. A Comprehensive View on the Protein Functions of Porcine Epidemic Diarrhea Virus. Genes (Basel) 2024; 15:165. [PMID: 38397155 PMCID: PMC10887554 DOI: 10.3390/genes15020165] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 01/24/2024] [Accepted: 01/24/2024] [Indexed: 02/25/2024] Open
Abstract
Porcine epidemic diarrhea (PED) virus (PEDV) is one of the main pathogens causing diarrhea in piglets and fattening pigs. The clinical signs of PED are vomiting, acute diarrhea, dehydration, and mortality resulting in significant economic losses and becoming a major challenge in the pig industry. PEDV possesses various crucial structural and functional proteins, which play important roles in viral structure, infection, replication, assembly, and release, as well as in escaping host innate immunity. Over the past few years, there has been progress in the study of PEDV pathogenesis, revealing the crucial role of the interaction between PEDV viral proteins and host cytokines in PEDV infection. At present, the main control measure against PEDV is vaccine immunization of sows, but the protective effect for emerging virus strains is still insufficient, and there is no ideal safe and efficient vaccine. Although scientists have persistently delved their research into the intricate structure and functionalities of the PEDV genome and viral proteins for years, the pathogenic mechanism of PEDV remains incompletely elucidated. Here, we focus on reviewing the research progress of PEDV structural and nonstructural proteins to facilitate the understanding of biological processes such as PEDV infection and pathogenesis.
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Affiliation(s)
- Xin Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (X.L.); (Y.W.); (Z.Y.); (G.L.); (J.L.)
- Zhaoqing Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Zhaoqing 526238, China
| | - Yiwan Wu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (X.L.); (Y.W.); (Z.Y.); (G.L.); (J.L.)
- Zhaoqing Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Zhaoqing 526238, China
| | - Zhibin Yan
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (X.L.); (Y.W.); (Z.Y.); (G.L.); (J.L.)
- Zhaoqing Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Zhaoqing 526238, China
| | - Gen Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (X.L.); (Y.W.); (Z.Y.); (G.L.); (J.L.)
| | - Jun Luo
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (X.L.); (Y.W.); (Z.Y.); (G.L.); (J.L.)
| | - Shile Huang
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130-3932, USA
- Department of Hematology and Oncology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130-3932, USA
- Feist-Weiller Cancer Center, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71130-3932, USA
| | - Xiaofeng Guo
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (X.L.); (Y.W.); (Z.Y.); (G.L.); (J.L.)
- Zhaoqing Branch Center of Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, Zhaoqing 526238, China
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Immunogenicity analysis of the E. coli expressed structural protein VP1 of persistent infection foot-and-mouth disease virus. Virology 2023; 579:111-118. [PMID: 36634474 DOI: 10.1016/j.virol.2023.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 12/31/2022] [Accepted: 01/04/2023] [Indexed: 01/09/2023]
Abstract
The persistent infection of FMDV in cloven hoofed animals has made the epidemic prevention and control more difficult. VP1 is the main immunogenic protein and first candidate of vaccine development for FMDV prevention. However, the mutation of VP1 in host cell with persistent infection FMDV (PI-FMDV) caused the change of its immunogenicity. Hence, it is imperative to establish the expression system for VP1 of PI-FMDV (PI-VP1) and re-evaluate its immunogenicity. In this study, the PI-VP1 with His-tag was cloned into pET-28a vector. PI-VP1 protein was expressed and purified in E. coli, and further the antiserum of immunized mice was analyzed. Results showed that purified PI-VP1 protein produced a good humoral and cellular immune response after immunizing mice. Furthermore, our study showed that the antiserum could not only neutralize PI-FMDV, but also prevent the adsorption of WT-FMDV. In summarize, our work provides valuable implications for the FMDV vaccines and therapeutics development.
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