1
|
Wang S, Wang Z, Li Y, Tu S, Zou J, Cheng Y, Zhang H, Suolang S, Zhou H. Generation of whole-porcine neutralizing antibodies of an alphacoronavirus by single B cell antibody technology. Antiviral Res 2023; 220:105754. [PMID: 37967753 DOI: 10.1016/j.antiviral.2023.105754] [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: 08/30/2023] [Revised: 10/17/2023] [Accepted: 11/08/2023] [Indexed: 11/17/2023]
Abstract
Porcine epidemic diarrhea virus (PEDV) is an alphacoronavirus that causes severe morbidity and mortality in piglets, resulting in substantial economic losses to the swine industry. While vaccination is currently the most effective preventive measure, existing vaccines fail to provide complete and reliable protection against PEDV infection. Consequently, there is a need to explore alternative or complementary strategies to address this issue. In this study, we utilized single B cell antibody technology to obtain a potent neutralizing antibody, C62, which specifically targets the receptor binding domain S1B of the PEDV-S1 protein. C62 exhibited potent neutralizing activity against PEDV and inhibited viral attachment to the cell surface in vitro. Furthermore, the effectiveness of C62 in mitigating PEDV infection was demonstrated in vivo, as evidenced by the delayed onset of diarrhea and reduced mortality rates observed in piglets following oral administration of C62. Our study provides an alternative approach for controlling PEDV infection. Meanwhile, C62 holds promise as a therapeutic biological agent to complement existing vaccines. More importantly, our study forms a solid foundation for the development of whole-porcine neutralizing antibodies against other swine coronaviruses, thus contributing to the overall improvement of swine health.
Collapse
Affiliation(s)
- Sheng Wang
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, PR China.
| | - Zhichen Wang
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, PR China.
| | - Ying Li
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, PR China.
| | - Shaoyu Tu
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, PR China.
| | - Jiahui Zou
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, PR China.
| | - Yanqing Cheng
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, PR China.
| | - Huawei Zhang
- Wuhan Keqian Biological Co., Ltd, Wuhan, Hubei, PR China.
| | - Sizhu Suolang
- Department of Animal Science, Tibet Agricultural and Animal Husbandry College, Nyingchi, Tibet, PR China.
| | - Hongbo Zhou
- National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, PR China; Department of Animal Science, Tibet Agricultural and Animal Husbandry College, Nyingchi, Tibet, PR China; Frontiers Science Center for Animal Breeding and Sustainable Production, Wuhan, Hubei, PR China; Hubei Hongshan Laboratory, Wuhan, Hubei, PR China.
| |
Collapse
|
2
|
Wang F, Zhang Q, Zhang F, Zhang E, Li M, Ma S, Guo J, Yang Z, Zhu J. Adenovirus vector-mediated single chain variable fragments target the nucleocapsid protein of porcine epidemic diarrhea virus and protect against viral infection in piglets. Front Immunol 2023; 14:1058327. [PMID: 36761768 PMCID: PMC9902916 DOI: 10.3389/fimmu.2023.1058327] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 01/04/2023] [Indexed: 01/26/2023] Open
Abstract
Porcine epidemic diarrhea virus (PEDV) mainly infects the intestinal epithelial cells of pigs, causing porcine epidemic diarrhea (PED). In particular, the virus causes severe diarrhea, dehydration, and death in neonatal piglets. Maternal immunity effectively protects neonatal piglets from PEDV infection; however, maternal antibodies can only prevent PEDV attachment and entry into target cells, but have no effects on intracellular viruses. Intracellular antibodies targeting virus-encoded proteins are effective in preventing viral infection. We previously identified four single chain variable fragments (scFvs), ZW1-16, ZW3-21, ZW1-41, and ZW4-16, which specifically targeted the PEDV N protein and significantly inhibited PEDV replication and up-regulated interferon-λ1 (IFN-λ1) expression in host cells. In our current study, the four scFvs were subcloned into replication-defective adenovirus vectors to generate recombinant adenoviruses rAdV-ZW1-16, rAdV-ZW3-21, rAdV-ZW1-41, and rAdV-ZW4-16. ScFvs were successfully expressed in Human Embryonic Kidney 293 (HEK293) cells and intestinal porcine epithelial cell line J2 (IPEC-J2) and were biosafe for piglets as indicated by body temperature and weight, scFv excretion in feces, IFN-γ and interleukin-4 (IL-4) expression in jejunum, and pathological changes in porcine tissue after oral administration. Western blotting, immunofluorescence, and immunohistochemical analyses showed that scFvs were expressed in porcine jejunum. The prophylactic effects of rAdV-ZW, a cocktail of the four rAdV-scFvs, on piglet diarrhea caused by PEDV was investigated. Clinical symptoms in piglets orally challenged with PEDV, following a two-time treatment with rAdV-ZW, were significantly reduced when compared with PEDV-infected piglets treated with phosphate buffered saline (PBS) or rAdV-wild-type. Also, no death and jejunal lesions were observed. ScFv co-localization with the PEDV N protein in vivo was also observed. Next, the expression of pro-inflammatory serum cytokines such as tumor necrosis factor-α (TNF-α), IL-6, IL-8, IL-12, and IFN-λ was assessed by enzyme-linked immunosorbent assay (ELISA), which showed that scFvs significantly suppressed PEDV-induced pro-inflammatory cytokine expression and restored PEDV-inhibited IFN-λ expression. Therefore, our study supported a promising role for intracellular scFvs targeting the PEDV N protein to prevent and treat diarrhea in PEDV-infected piglets.
Collapse
Affiliation(s)
- Fengqing Wang
- Shanghai Key Laboratory of Veterinary Biotechnology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China,Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Qing Zhang
- State Key Laboratory of Advanced Optical Communication Systems and Networks, Key Laboratory for Laser Plasmas (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China,*Correspondence: Qing Zhang, ; Jianguo Zhu,
| | - Fanqing Zhang
- Shanghai Key Laboratory of Veterinary Biotechnology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - En Zhang
- Shanghai Key Laboratory of Veterinary Biotechnology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Mei Li
- Shanghai Key Laboratory of Veterinary Biotechnology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Shiwei Ma
- Shanghai Key Laboratory of Veterinary Biotechnology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Jianming Guo
- Shanghai Key Laboratory of Veterinary Biotechnology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Zhibiao Yang
- Shanghai Key Laboratory of Veterinary Biotechnology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Jianguo Zhu
- Shanghai Key Laboratory of Veterinary Biotechnology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China,*Correspondence: Qing Zhang, ; Jianguo Zhu,
| |
Collapse
|
3
|
A New Neutralization Epitope in the Spike Protein of Porcine Epidemic Diarrhea Virus. Int J Mol Sci 2022; 23:ijms23179674. [PMID: 36077070 PMCID: PMC9456025 DOI: 10.3390/ijms23179674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/19/2022] [Accepted: 08/23/2022] [Indexed: 11/16/2022] Open
Abstract
Porcine epidemic diarrhea virus (PEDV) infects piglets and causes serious diarrhea as well as vomiting, dehydration, and death. The trimeric S protein plays a crucial role in the induction of neutralizing antibodies, and many neutralizing monoclonal antibodies (mAbs) against PEDV S protein have been developed. However, these mAbs exclusively target the S1 protein. In this study, we obtained a neutralizing mAb, 5F7, against the S2 protein of PEDV, and this mAb could neutralize new variant genotype 2 PEDV strains (LNCT2), as well as a genotype 1 PEDV strain (CV777), in vitro. The core sequence of the epitope was found in amino acid sequence 1261 aa~1337 aa. These findings confirm that the S2 protein possessed neutralizing epitopes and provided knowledge to aid further research on this virus.
Collapse
|
4
|
Yu R, Dong S, Chen B, Liu Y, Li F, Si F, Xie C, Li Z. Antigenicity Alternations of Variant PEDV S Protein Disclosed by Linear B Cell Epitope Mapping. Viruses 2022; 14:v14071371. [PMID: 35891352 PMCID: PMC9322158 DOI: 10.3390/v14071371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/17/2022] [Accepted: 06/21/2022] [Indexed: 02/04/2023] Open
Abstract
The spike protein (S) plays a crucial role in porcine epidemic diarrhea virus (PEDV) infection and induces neutralizing antibodies. Mutations of the S protein are supposed to provide the main antigenic shift leading to the antigenic escape of PEDVs. It is therefore a significant question how much accumulation of antigenic shift could lead to the antigenic escape of the variant PEDV. To provide an answer in the study, B cell epitopes (BCEs) on the S protein of the PEDV vaccine strain CV777 (SCV777) and variant strain SD2014 (SSD2014) were mapped using biosynthetic peptides and rabbit anti-PEDV S serum. Seventy-nine and 68 linear BCEs were identified from SCV777 and SSD2014, respectively. While 66.2% of the BCEs of SSD2014 could be recognized by anti-SCV777 serum and 67.1% of SCV777 BCEs could be recognized by anti-SSD2014 serum, more than 40% of the BCEs identified using anti-SCV777 serum on SCV777 could not be recognized by anti-SSD2014 serum and vice versa. The completely shared BCEs took low percentages of 29.4% and 25.3% for SSD2014 and SCV777, respectively. These results indicate a low conservation of antigenicity of the S protein compared to a relatively high amino acid sequence similarity of 92.2% between the two strains. The study provided a BCE shift reference of PEDV antigenic escape and surveillance control.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | - Zhen Li
- Correspondence: ; Tel.: +86-21-6220-6391
| |
Collapse
|