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Wu Y, Liu Y, Yang H, Sirimanapong W, Huang T, Chen J, Xia L. Construction of Heme-Binding Protein Deleted Strain and Using It as an Attenuated Vaccine Against Nocardia seriolae in Hybrid Snakehead (Channa maculata ♀ × Channa argus ♂). JOURNAL OF FISH DISEASES 2025; 48:e14090. [PMID: 39945098 DOI: 10.1111/jfd.14090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2024] [Revised: 12/29/2024] [Accepted: 01/20/2025] [Indexed: 05/14/2025]
Abstract
Nocardia seriolae is the main pathogen causing fish nocardiosis, which can infect various aquatic freshwater and marine fish species. We have previously confirmed that the heme-binding protein of N. seriolae (NsHBP) is a secreted protein relating to bacterial virulence. In the present study, a ΔNsHBP mutant of N. seriolae was successfully generated by deleting NsHBP gene, and it was further used for attenuated vaccine development and evaluation in hybrid snakehead (Channa maculata ♀ × Channa argus ♂). The LD50 of strain ΔNsHBP by intraperitoneal injection in hybrid snakehead was presented at 5.47 × 107 CFU/mL, significantly (p < 0.01) higher than that of the wild-type strain at 5.28 × 105 CFU/mL, indicating the virulent reduction of strain ΔNsHBP in comparison to wild-type strain. The live attenuated vaccine used strain ΔNsHBP at sub-clinical dosages (LD15, 1.26 × 107 CFU/mL) to immunise the fish by intraperitoneal injection for 56 days could provide a relative percentage survival (RPS) at 82.40% against artificial challenge with wild-type strain ZJ0503. Additionally, serum enzymes activities of lysozyme (LZM), peroxidase (POD), acid phosphatase (ACP), alkaline phosphatase (AKP), superoxide dismutase (SOD) as well as specific antibody (IgM) titers were induced in fish following ΔNsHBP vaccination. Furthermore, the expression of immune-related genes (TNFα, IL-1β, MHCIα, MHCIIα, CD4 and CD8α) was significantly increased in comparison to the control group during immunisation period with ΔNsHBP in fish. Taken together, it is revealed that the deleted strain ΔNsHBP could be a potential candidate for live attenuated vaccine development to control fish nocardiosis in aquaculture.
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Affiliation(s)
- Yanqi Wu
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Shenzhen Institute of Guangdong Ocean University, Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Yansheng Liu
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Shenzhen Institute of Guangdong Ocean University, Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Huiyuan Yang
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Shenzhen Institute of Guangdong Ocean University, Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Wanna Sirimanapong
- Veterinary Aquatic Animal Research & Health Care Unit, Department of Clinical Sciences and Public Health, Faculty of Veterinary Science, Mahidol University, Nakhon-Pathom, Thailand
| | - Ting Huang
- Guangxi Key Laboratory of Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Academy of Fishery Science, Nanning, Guangxi, China
| | - Jianlin Chen
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Shenzhen Institute of Guangdong Ocean University, Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Liqun Xia
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Shenzhen Institute of Guangdong Ocean University, Fisheries College of Guangdong Ocean University, Zhanjiang, Guangdong, China
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Hu T, Wang Y, Wang Y, Cui H, Zhang J, Chen H, Wu B, Hao S, Chu CC, Wu Y, Zeng W. Production and evaluation of three kinds of vaccines against largemouth bass virus, and DNA vaccines show great application prospects. FISH & SHELLFISH IMMUNOLOGY 2024; 153:109841. [PMID: 39173984 DOI: 10.1016/j.fsi.2024.109841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 08/10/2024] [Accepted: 08/14/2024] [Indexed: 08/24/2024]
Abstract
Largemouth bass virus (LMBV) infections has resulted in high mortality and economic losses to the global largemouth bass industry and has seriously restricted the healthy development of the bass aquaculture industry. There are currently no antiviral therapies available for the control of this disease. In this study, we developed three types of vaccine against LMBV; whole virus inactivated vaccine (I), a subunit vaccine composed of the major viral capsid protein MCP (S) as well as an MCP DNA vaccine(D), These were employed using differing immunization and booster strategies spaced 2 weeks apart as follows: II, SS, DD and DS. We found that all vaccine groups induced humoral and cellular immune responses and protected largemouth bass from a lethal LMBV challenge to varying degrees and DD produced the best overall effect. Specifically, the levels of specific IgM in serum in all immunized groups were elevated and significantly higher than those in the control group. Moreover, the expression of humoral immunity (CD4 and IgM) and cellular immunity (MHCI-α) as well as cytokines (IL-1β) was increased, and the activity of immunity-related enzymes ACP, AKP, LZM, and T-SOD in the serum was significantly enhanced. In addition, the relative percent survival of fish following an LMBV lethal challenge 4 weeks after the initial immunizations were high for each group: DD(89.5 %),DS(63.2 %),SS(50 %) and II (44.7 %). These results indicated that the MCP DNA vaccine is the most suitable and promising vaccine candidate for the effective control of LMBV disease.
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Affiliation(s)
- Tianmei Hu
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Yaoda Wang
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Yuhui Wang
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Hongye Cui
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Jiping Zhang
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Haiyue Chen
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Baozhou Wu
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Shuguang Hao
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Chien Chi Chu
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China
| | - Yali Wu
- Foshan Institute of Agricultural Sciences, Foshan, 528145, Guangdong, PR China
| | - Weiwei Zeng
- School of Life Science and Engineering, Foshan University, Foshan, 528225, PR China.
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Liu Y, Weng T, Pan X, Wen Y, Yang H, Chen J, Xia L. Construction of an alanine dehydrogenase gene deletion strain for vaccine development against Nocardia seriolae in hybrid snakehead (Channa maculata ♀ × Channa argus ♂). FISH & SHELLFISH IMMUNOLOGY 2023; 138:108827. [PMID: 37207887 DOI: 10.1016/j.fsi.2023.108827] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 05/08/2023] [Accepted: 05/15/2023] [Indexed: 05/21/2023]
Abstract
Nocardia seriolae is the main pathogen of fish nocardiosis. In our previous study, alanine dehydrogenase was identified as a potential virulence factor of N. seriolae. On the basis of this fact, the alanine dehydrogenase gene of N. seriolae (NsAld) was knocked out to establish the strain ΔNsAld for vaccine development against fish nocardiosis in this study. The LD50 of strain ΔNsAld was 3.90 × 105 CFU/fish, higher than that of wild strain (5.28 × 104 CFU/fish) significantly (p < 0.05). When the strain ΔNsAld was used as a live vaccine to immunize hybrid snakehead (Channa maculata ♀ × Channa argus ♂) at 2.47 × 105 CFU/fish by intraperitoneal injection, the non-specific immune indexes (LZM, CAT, AKP, ACP and SOD activities), specific antibody (IgM) titers and several immune-related genes (CD4, CD8α, IL-1β, MHCIα, MHCIIα and TNFα) were up-regulated in different tissues, indicating that this vaccine could induce humoral and cell-mediated immune responses. Furthermore, the relative percentage survival (RPS) of ΔNsAld vaccine was calculated as 76.48% after wild N. seriolae challenge. All these results suggest that the strain ΔNsAld could be a potential candidate for live vaccine development to control fish nocardiosis in aquaculture.
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Affiliation(s)
- Yansheng Liu
- Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen Public Service Platform for Evaluation of Marine Economic Animal Seedings, Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Tingting Weng
- Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen Public Service Platform for Evaluation of Marine Economic Animal Seedings, Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Xuhao Pan
- Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Yiming Wen
- Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen Public Service Platform for Evaluation of Marine Economic Animal Seedings, Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Huiyuan Yang
- Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen Public Service Platform for Evaluation of Marine Economic Animal Seedings, Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Jianlin Chen
- Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen Public Service Platform for Evaluation of Marine Economic Animal Seedings, Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Guangdong Ocean University, Zhanjiang, Guangdong, China.
| | - Liqun Xia
- Guangdong Provincial Engineering Research Center for Aquatic Animal Health Assessment, Shenzhen Public Service Platform for Evaluation of Marine Economic Animal Seedings, Shenzhen Institute of Guangdong Ocean University, Shenzhen, Guangdong, China; Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture, Guangdong Ocean University, Zhanjiang, Guangdong, China.
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