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Wang C, Hu X, Tang H, Ge W, Di L, Zou J, Cui Z, Zhou A. Multiple effects of dietary supplementation with Lactobacillus reuteri and Bacillus subtilis on the growth, immunity, and metabolism of largemouth bass (Micropterus salmoides). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2024; 160:105241. [PMID: 39121939 DOI: 10.1016/j.dci.2024.105241] [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: 04/19/2024] [Revised: 08/06/2024] [Accepted: 08/06/2024] [Indexed: 08/12/2024]
Abstract
Probiotics play an essential role in the largemouth bass (Micropterus salmoides) aquaculture sector. They aid the fish in sickness prevention, intestinal structure improvement, food absorption, and immune system strengthening. In this experiment, Bacillus subtilis (BS, 107 CFU/g) and Lactobacillus reuteri (LR, 107 CFU/g) were added to the feed and then fed to M. salmoides for 35 days. The effects of two probiotics on the growth, immunity, and metabolism of M. salmoides organisms were studied. The results revealed that the BS group significantly increased the growth rate and specific growth rate of M. salmoides, while both the BS and LR groups significantly increase the length of villi M. salmoides intestines. The BS group significantly increased the levels of AKP, T-AOC, and CAT in the blood of M. salmoides, as well as AKP levels in the intestine. Furthermore, the BS group significantly increased the expression of intestinal genes Nrf2, SOD1, GPX, and CAT, while significantly decreasing the expression of the keap1 gene. M. salmoides gut microbial analysis showed that the abundance of Planctomycetota was significantly different in both control and experimental groups. Analyzed at the genus level, the abundance of Citrobacter, Paracoccus, Luedemannella, Sphingomonas, Streptomyces and Xanthomonas in the both control and experimental groups were significantly different. The BS group's differentially expressed genes were predominantly enriched in oxidative phosphorylation pathways in the intestine, indicating that they had a good influence on intestinal metabolism and inflammation suppression. In contrast, differentially expressed genes in the LR group were primarily enriched in the insulin signaling and linoleic acid metabolism pathways, indicating improved intestine metabolic performance. In conclusion, B. subtilis and L. reuteri improve the growth and health of M. salmoides, indicating tremendous potential for enhancing intestinal metabolism and providing significant application value.
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Affiliation(s)
- Chong Wang
- University Joint Laboratory of Guangdong Province, Hong Kong and Macao Region on Marine Bioresource Conservation and Exploitation, Guangdong Laboratory for Lingnan Modern Agriculture, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Xiaodi Hu
- Department of Animal Physiology, College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China
| | - Huijuan Tang
- University Joint Laboratory of Guangdong Province, Hong Kong and Macao Region on Marine Bioresource Conservation and Exploitation, Guangdong Laboratory for Lingnan Modern Agriculture, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Wei Ge
- Department of Biomedical Sciences and Centre of Reproduction, Development and Aging (CRDA), Faculty of Health Sciences, University of Macau, Taipa, Macau, China
| | - Lijun Di
- Department of Biomedical Sciences and Centre of Reproduction, Development and Aging (CRDA), Faculty of Health Sciences, University of Macau, Taipa, Macau, China
| | - Jixing Zou
- University Joint Laboratory of Guangdong Province, Hong Kong and Macao Region on Marine Bioresource Conservation and Exploitation, Guangdong Laboratory for Lingnan Modern Agriculture, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
| | - Zongbin Cui
- State Key Laboratory of Applied Microbiology Southern China, Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, 510070, Guangdong, China.
| | - Aiguo Zhou
- University Joint Laboratory of Guangdong Province, Hong Kong and Macao Region on Marine Bioresource Conservation and Exploitation, Guangdong Laboratory for Lingnan Modern Agriculture, College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
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Xu FF, Deng ZY, Sheng JJ, Zhu B. The HSP70 and IL-1β of Nile tilapia as molecular adjuvants can enhance the immune protection of DNA vaccine against Streptococcus agalactiae infection. JOURNAL OF FISH DISEASES 2024; 47:e14002. [PMID: 39075840 DOI: 10.1111/jfd.14002] [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: 04/10/2024] [Revised: 07/10/2024] [Accepted: 07/15/2024] [Indexed: 07/31/2024]
Abstract
Globally, streptococcal disease caused by Streptococcus agalactiae is known for its high mortality rate, which severely limits the development of the tilapia breeding industry. As a third-generation vaccine, DNA vaccines have shown great application prospects in the prevention and control of aquatic diseases, but their low immunogenicity limits their development. The combination of DNA vaccines and molecular adjuvants proved to be an effective method for inducing protective immunity. This study constructed recombinant plasmids encoding tilapia HSP70 and IL-1β genes (pcHSP70 and pcIL-1β) to verify their effectiveness as molecular adjuvants for S. agalactiae DNA vaccine (pcSIP) in the immunized tilapia model. The results revealed that serum-specific IgM production, enzyme activities, and immune-related gene expression in tilapia immunized with pcSIP plus pcHSP70 or pcIL-1β were significantly higher than those in tilapia immunized with pcSIP alone. It is worth noting that combination with molecular adjuvants improved the immune protection of DNA vaccines, with a relative percentage survival (RPS) of 51.72% (pcSIP plus pcHSP70) and 44.83% (pcSIP plus pcIL-1β), respectively, compared with that of pcSIP alone (24.14%). Thus, our study indicated that HSP70 and IL-1β in tilapia are promising molecular adjuvants of the DNA vaccine in controlling S. agalactiae infection.
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Affiliation(s)
- Fei-Fan Xu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Zhu-Yang Deng
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jun-Jie Sheng
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
- Engineering Research Center of the Innovation and Development of Green Fishery Drugs, Northwest A&F University, Yangling, China
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Bai Z, Wan D, Lan T, Hong W, Dong H, Wei Y, Wei X. Nanoplatform Based Intranasal Vaccines: Current Progress and Clinical Challenges. ACS NANO 2024; 18:24650-24681. [PMID: 39185745 PMCID: PMC11394369 DOI: 10.1021/acsnano.3c10797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/27/2024]
Abstract
Multiple vaccine platforms have been employed to develop the nasal SARS-CoV-2 vaccines in preclinical studies, and the dominating pipelines are viral vectored as protein-based vaccines. Among them, several viral vectored-based vaccines have entered clinical development. Nevertheless, some unsatisfactory results were reported in these clinical studies. In the face of such urgent situations, it is imperative to rapidly develop the next-generation intranasal COVID-19 vaccine utilizing other technologies. Nanobased intranasal vaccines have emerged as an approach against respiratory infectious diseases. Harnessing the power of nanotechnology, these vaccines offer a noninvasive yet potent defense against pathogens, including the threat of COVID-19. The improvements made in vaccine mucosal delivery technologies based on nanoparticles, such as lipid nanoparticles, polymeric nanoparticles, inorganic nanoparticles etc., not only provide stability and controlled release but also enhance mucosal adhesion, effectively overcoming the limitations of conventional vaccines. Hence, in this review, we overview the evaluation of intranasal vaccine and highlight the current barriers. Next, the modern delivery systems based on nanoplatforms are summarized. The challenges in clinical application of nanoplatform based intranasal vaccine are finally discussed.
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Affiliation(s)
- Ziyi Bai
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu, Sichuan 610041, P. R. China
| | - Dandan Wan
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu, Sichuan 610041, P. R. China
| | - Tianxia Lan
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu, Sichuan 610041, P. R. China
| | - Weiqi Hong
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu, Sichuan 610041, P. R. China
| | - Haohao Dong
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu, Sichuan 610041, P. R. China
| | - Yuquan Wei
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu, Sichuan 610041, P. R. China
| | - Xiawei Wei
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 17, Block 3, Southern Renmin Road, Chengdu, Sichuan 610041, P. R. China
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Zhao Z, Meng Q, Sun TZ, Zhu B. Mannose modified targeted immersion vaccine delivery system improves protective immunity against Infectious spleen and kidney necrosis virus in mandarin fish (Siniperca chuatsi). Vaccine 2024; 42:2886-2894. [PMID: 38519342 DOI: 10.1016/j.vaccine.2024.03.047] [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: 08/12/2022] [Revised: 03/15/2024] [Accepted: 03/18/2024] [Indexed: 03/24/2024]
Abstract
Vaccination is an effective method to prevent viral diseases. However, the biological barrier prevents the immersion vaccine from achieving the best effect without adding adjuvants and carriers. Researches on the targeted presentation technology of vaccines with nanocarriers are helpful to develop immersion vaccines for fish that can break through biological barriers and play an effective role in fish defense. In our study, functionally modified single-walled carbon nanotubes (SWCNTs) were used as carriers to construct a targeted immersion vaccine (SWCNTs-M-MCP) with mannose modified major capsid protein (MCP) to target antigen-presenting cells (APCs), against iridovirus diseases. After bath immunization, our results showed that SWCNTs-M-MCP induced the presentation process and uptake of APCs, triggering a powerful immune response. Moreover, the highest relative percent survival (RPS) was 81.3% in SWCNTs-M-MCP group, which was only 41.5% in SWCNTs-MCP group. Altogether, this study indicates that the SWCNTs-based targeted immersion vaccine induces strong immune response and provided an effective protection against iridovirus diseases.
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Affiliation(s)
- Zhao Zhao
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, PR China
| | - Qiang Meng
- Shenzhen Vaccine Biotechnology Co., Ltd, B618, Virtual University Experimental Platform Building, Nanshan District, Shenzhen 518000, PR China
| | - Tian-Zi Sun
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, PR China
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, PR China.
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He R, Zhu N, Chen X, Liang Q, Yao G, Tian Q, Zhou F, Ding X. Experimental evidence of effective disinfectant to control the transmission of Micropterus salmoides rhabdovirus. JOURNAL OF FISH DISEASES 2024; 47:e13891. [PMID: 37990596 DOI: 10.1111/jfd.13891] [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: 09/12/2023] [Revised: 11/02/2023] [Accepted: 11/06/2023] [Indexed: 11/23/2023]
Abstract
Micropterus salmoides rhabdovirus (MSRV) is a significant pathogen that causes high morbidity and mortality in largemouth bass, leading to enormous economic losses for largemouth bass aquaculture in China. The aim of this study was to investigate the efficacy of four disinfectants (potassium permanganate, glutaraldehyde, trichloroisocyanuric acid and povidone iodine) on MSRV, to control the infection and transmission of MSRV in largemouth bass aquaculture. The disinfectants were tested at different concentrations (5, 25, 50, 100 and 500 mg/L) prepared with distilled water for 30 min contact time, and the viral nucleic acid was quantified using qPCR and the infectivity was tested by challenge experiment. Potassium permanganate at 5-500 mg/L, glutaraldehyde at 500 mg/L, trichloroisocyanuric acid at 50-500 mg/L and povidone iodine at 500 mg/L concentration could effectively decrease the virus nucleic acid, and the survival rate of largemouth bass juveniles after challenge experiment increased significantly from 3.7% ± 6.41% to 33.33 ± 11.11% - 100%. Moreover, the minimum effective time of 5 mg/L potassium permanganate was further studied at 2, 5, 10 and 20 min contact time. The viral nucleic acid decreased significantly at 5-20 min exposure time, and the survival rate increased significantly from 7.41% ± 6.41% to 77.78 ± 11.11% - 100%. The median lethal concentration (LC50 ) values of potassium permanganate were 10.64, 6.92 and 3.7 mg/L at 24, 48 and 96 h, respectively. Potassium permanganate could be used for the control of MSRV in the cultivation process; the recommended concentration is 5 mg/L and application time should be less than 24 h. The results could be applied to provide a method to control the infection and transmission of MSRV in water, and improve the health status of largemouth bass.
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Affiliation(s)
- Runzhen He
- Zhejiang Fisheries Technical Extension Center, Hangzhou, China
| | - Ningyu Zhu
- Zhejiang Fisheries Technical Extension Center, Hangzhou, China
| | - Xiaoming Chen
- Zhejiang Fisheries Technical Extension Center, Hangzhou, China
| | - Qianrong Liang
- Zhejiang Fisheries Technical Extension Center, Hangzhou, China
| | - Gaohua Yao
- Zhejiang Fisheries Technical Extension Center, Hangzhou, China
| | - Quanquan Tian
- Zhejiang Fisheries Technical Extension Center, Hangzhou, China
| | - Fan Zhou
- Zhejiang Fisheries Technical Extension Center, Hangzhou, China
| | - Xueyan Ding
- Zhejiang Fisheries Technical Extension Center, Hangzhou, China
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Yang MX, Liang JH, Luo S, Zhang SB, Zhou QJ, Lu JF, Chen J. Oral vaccination with recombinant Saccharomyces cerevisiae expressing Micropterus salmoides rhabdovirus G protein elicits protective immunity in largemouth bass. FISH & SHELLFISH IMMUNOLOGY 2024; 145:109364. [PMID: 38199264 DOI: 10.1016/j.fsi.2024.109364] [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: 10/12/2023] [Revised: 12/21/2023] [Accepted: 01/06/2024] [Indexed: 01/12/2024]
Abstract
Micropterus salmoides rhabdovirus (MSRV) is one of the main pathogens of largemouth bass, leading to serious economic losses. The G protein, as the only envelope protein present on the surface of MSRV virion, contains immune-related antigenic determinants, thereby becoming the primary target for the design of MSRV vaccines. Here, we displayed the G protein on the surface of yeast cells (named EBY100/pYD1-G) and conducted a preliminary assessment of the protective efficacy of the recombinant yeast vaccine. Upon oral vaccination, a robust immune response was observed in systemic and mucosal tissue. Remarkably, following the MSRV challenge, the relative percent survival of EBY100/pYD1-G treated largemouth bass significantly increased to 66.7 %. In addition, oral administration inhibited viral replication and alleviated the pathological symptoms of MSRV-infected largemouth bass. These results suggest that EBY100/pYD1-G could be used as a potential oral vaccine against MSRV infection.
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Affiliation(s)
- Mao-Xia Yang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, 315211, China; Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo, 315211, China; Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Meishan Campus, Ningbo University, Ningbo, 315211, China
| | - Jia-Hui Liang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, 315211, China; Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo, 315211, China; Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Meishan Campus, Ningbo University, Ningbo, 315211, China
| | - Sheng Luo
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, 315211, China; Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo, 315211, China; Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Meishan Campus, Ningbo University, Ningbo, 315211, China
| | - Shi-Bo Zhang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, 315211, China; Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo, 315211, China; Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Meishan Campus, Ningbo University, Ningbo, 315211, China
| | - Qian-Jin Zhou
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, 315211, China; Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo, 315211, China; Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Meishan Campus, Ningbo University, Ningbo, 315211, China
| | - Jian-Fei Lu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, 315211, China; Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo, 315211, China; Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Meishan Campus, Ningbo University, Ningbo, 315211, China.
| | - Jiong Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Ningbo University, Ningbo, 315211, China; Laboratory of Biochemistry and Molecular Biology, School of Marine Sciences, Ningbo University, Ningbo, 315211, China; Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Meishan Campus, Ningbo University, Ningbo, 315211, China.
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Zhang LJ, Chen Q, Yang JX, Ge JQ. Immune responses and protective efficacy of American eel (Anguilla rostrata) immunized with a formalin-inactivated vaccine against Anguillid herpesvirus. FISH & SHELLFISH IMMUNOLOGY 2024; 144:109262. [PMID: 38040135 DOI: 10.1016/j.fsi.2023.109262] [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: 09/28/2023] [Revised: 11/14/2023] [Accepted: 11/26/2023] [Indexed: 12/03/2023]
Abstract
Anguillid herpesvirus 1 (AngHV), the causative agent of "mucus sloughing and hemorrhagic septicemia disease", causes serious infectious diseases in farmed eel. Among the effective prevention and control strategies, vaccination is one of the most effective approaches. However, no vaccine for AngHV is available. Our study developed a formalin-inactivated AngHV vaccine and evaluated its performance in American eels. Initially, AngHV-FJ, a strain of AngHV, was inactivated completely by 0.1 % formaldehyde, mixed with adjuvant Montanide ISA 763 A VG (763A). Then, vaccines containing different amount of antigen (3 × 106 PFU, 3 × 105 PFU, 3 × 104 PFU, 3 × 103 PFU) were immunized in each American eels. The results showed that the 3 × 105 PFU/fish was the proper dose. The inactivated AngHV vaccine was proven safe for American eels by back intramuscular injection. The results of twice immunization showed that antibody production peaked in the 8th week after the first immunization, and the antibody titer was 1:64,000. Furthermore, the immunized fishes challenged with AngHV (105 PFU/ml immersion) showed a significantly lower incidence rate (33.33 %) than the control group (95.65 %). The survival of the fish in the vaccine group (94.44 %) was significantly higher than the control group (60.87 %). The relative survival rate of the vaccinated group was 85.80 %. Also, vaccine group tissue collected at 7th d post-challenge showed reduced tissue damage and a lower virus load than the control group. The expression of cytokines of IL-1β, IFN-α, IFN-γ, Mx1, RIG-1, and IRF-3, were significantly lower in the vaccine group than the control group at the 7th and 14th d post-challenge. Overall, the formalin-inactivated AngHV vaccine was safe and had immune protective effects against AngHV infection.
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Affiliation(s)
- Li-Juan Zhang
- Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China
| | - Qiang Chen
- Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China
| | - Jin-Xian Yang
- Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China
| | - Jun-Qing Ge
- Institute of Biotechnology, Fujian Academy of Agricultural Sciences, Fuzhou, Fujian, China.
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Cao Y, Liu J, Liu G, Du H, Liu T, Liu T, Li P, Yu Q, Wang G, Wang E. A nanocarrier immersion vaccine encoding surface immunogenic protein confers cross-immunoprotection against Streptococcus agalactiae and Streptococcus iniae infection in tilapia. FISH & SHELLFISH IMMUNOLOGY 2024; 144:109267. [PMID: 38043875 DOI: 10.1016/j.fsi.2023.109267] [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: 07/08/2023] [Revised: 11/18/2023] [Accepted: 11/27/2023] [Indexed: 12/05/2023]
Abstract
Streptococcosis is a highly contagious aquatic bacterial disease that poses a significant threat to tilapia. Vaccination is a well-known effective measure to prevent and control fish bacterial diseases. Among the various immunization methods, immersion vaccination is simple and can be widely used in aquaculture. Besides, nanocarrier delivery technology has been reported as an effective solution to improve the immune effect of immersion vaccine. In this study, the surface immunogenic protein (Sip) was proved to be conserved and potential to provide cross-immunoprotection for both Streptococcus agalactiae (S. agalactiae) and Streptococcus iniae (S. iniae) by multiple sequences alignment and Western blotting analysis. On this basis, we expressed and obtained the recombinant protein rSip and connected it with functionalized carbon nanotubes (CNT) to construct the nanocarrier vaccine system CNT-rSip. After immersion immunization, the immune effect of CNT-rSip against above two streptococcus infections was evaluated in tilapia based on some aspects including the serum specific antibody level, non-specific enzyme activities, immune-related genes expression and relative percent survival (RPS) after bacteria challenge. The results showed that compared with control group, CNT-rSip significantly (P < 0.05) increased the serum antibody levels, related enzyme activities including acid phosphatase, alkaline phosphatase, lysozyme and total antioxidant capacity activities, as well as the expression levels of immune-related genes from 2 to 4 weeks post immunization (wpi), and all these indexes peaked at 3 wpi. Besides, the above indexes of CNT-rSip were higher than those of rSip group with different extend during the experiment. Furthermore, the challenge test indicated that CNT-rSip provided cross-immunoprotection against S. agalactiae and S. iniae infection with RPS of 75 % and 72.41 %, respectively, which were much higher than those of other groups. Our study indicated that the nanocarrier immersion vaccine CNT-rSip could significantly improve the antibody titer and confer cross-immuneprotection against S. agalactiae and S. iniae infection in tilapia.
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Affiliation(s)
- Ye Cao
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jia Liu
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Gaoyang Liu
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Hui Du
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Tianqiang Liu
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Livestock Biology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Tao Liu
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Livestock Biology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Pengfei Li
- Guangxi Key Laboratory of Aquatic Biotechnology and Modern Ecological Aquaculture, Guangxi Academy of Marine Sciences, Guangxi Academy of Sciences, Nanning, China
| | - Qing Yu
- Guangxi Key Laboratory of Aquatic Biotechnology and Modern Ecological Aquaculture, Guangxi Academy of Marine Sciences, Guangxi Academy of Sciences, Nanning, China.
| | - Gaoxue Wang
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Livestock Biology, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Erlong Wang
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Livestock Biology, Northwest A&F University, Yangling, Shaanxi 712100, China.
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Zhu M, Shen Z, Gu Y, Tong X, Zhang Y, Pan J, Feng Y, Hu X, Wang Y, Cao G, Xue R, Gong C. A recombinant baculovirus vector vaccine (BacMCP) against the infectious spleen and kidney necrosis virus (ISKNV). JOURNAL OF FISH DISEASES 2023; 46:165-176. [PMID: 36423261 DOI: 10.1111/jfd.13731] [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: 09/13/2022] [Revised: 11/05/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
The infectious spleen and kidney necrosis virus (ISKNV) is a highly lethal virus, which has brought significant losses to aquaculture. Therefore, a new vaccine against ISKNV with high efficiency, safety and convenience must be developed. While baculoviruses are more commonly used as protein expression systems for vaccine antigen production, this paper used baculovirus technology to develop a live-vector vaccine, BacMCP, which contains the coding sequence of the major capsid protein (MCP) (GenBank accession no. AF371960) of ISKNV and is driven by a CMV promoter. Real-time PCR and immunofluorescence showed that the MCP gene was successfully delivered to and expressed in fish cells and tissues inoculated with BacMCP. Immune-related gene (IgM, TGF-β, IL-1, IL-8, TNF-α) expression was induced in BacMCP-treated groups of largemouth bass compared with control groups. Specific antibodies could be detected in the serum of BacMCP injection-vaccinated largemouth bass by ELISA. After injection or immersion vaccination with BacMCP for 21 days, largemouth bass were infected with ISKNV. The immune effect of the injected immunization on fish in different sizes was evaluated. The vaccine efficacy of injection-vaccinated bass was 100% in small bass and 85.7% in large bass. The vaccine efficacy of immersion-vaccinated small bass was 77.3%. This study suggested that BacMCP can be used as a vector-based vaccine candidate to prevent the diseases caused by ISKNV infection.
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Affiliation(s)
- Min Zhu
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
- Agricultural Biotechnology Research Institute, Agricultural biotechnology and Ecological Research Institute, Soochow University, Suzhou, China
| | - Zeen Shen
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
| | - Yuchao Gu
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
| | - Xinyu Tong
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
| | - Yaxin Zhang
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
| | - Jun Pan
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
| | - Yongjie Feng
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
- Agricultural Biotechnology Research Institute, Agricultural biotechnology and Ecological Research Institute, Soochow University, Suzhou, China
| | - Xiaolong Hu
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
- Agricultural Biotechnology Research Institute, Agricultural biotechnology and Ecological Research Institute, Soochow University, Suzhou, China
| | - Yujun Wang
- Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, Beibu Gulf University, Qinzhou, China
| | - Guangli Cao
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
- Agricultural Biotechnology Research Institute, Agricultural biotechnology and Ecological Research Institute, Soochow University, Suzhou, China
| | - Renyu Xue
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
- Agricultural Biotechnology Research Institute, Agricultural biotechnology and Ecological Research Institute, Soochow University, Suzhou, China
| | - Chengliang Gong
- School of Biology and Basic Medical Sciences, Soochow University, Suzhou, China
- Agricultural Biotechnology Research Institute, Agricultural biotechnology and Ecological Research Institute, Soochow University, Suzhou, China
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10
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Li BY, Qin JC, Shen YF, Yang F, Wang T, Ling F, Wang GX. A therapeutic agent of ursolic acid demonstrates potential application in aquaculture. Virus Res 2023; 323:198965. [PMID: 36272540 PMCID: PMC10194260 DOI: 10.1016/j.virusres.2022.198965] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 10/02/2022] [Accepted: 10/09/2022] [Indexed: 11/09/2022]
Abstract
Micropterus salmoides rhabdovirus (MSRV) has a high mortality rate and causes huge economic losses to the aquaculture industry. In this study, we identified that ursolic acid (UA) had antiviral efficacy against MSRV in vitro and in vivo. The results showed that UA inhibited MSRV replication in grass carp ovary (GCO) cells with a half-maximal inhibitory concentration (IC50) of 5.55 μM, reduced viral titers and decreased cytopathic effects (CPE). Mechanistically, UA does not directly damage viral particles. On the other hand, UA inhibits MSRV replication by altering viral binding and release. Furthermore, pre- and post-treatment assays revealed that UA had preventive and therapeutic effects. For in vivo studies, UA could enhance the survival rate of MSRV-infected largemouth bass. Similarly, UA reduced the viral load of MSRV in the heart, spleen and brain at 3, 5 and 7 d post-infection. In conclusion, UA is an effective inhibitor of rhabdovirus in aquaculture.
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Affiliation(s)
- Bo-Yang Li
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Jia-Cheng Qin
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Yu-Feng Shen
- Changzhou Agricultural Comprehensive Technology Extension Center, Middle Changjiang Road 289-1nd, Changzhou, Jiangsu 213002, China
| | - Fei Yang
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Tao Wang
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Fei Ling
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Gao-Xue Wang
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China.
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11
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Ma R, Chen W, Guo Z, Jia Y, Zhu B, Wang E, Wang G. Screening the potential part of the G protein antigen is an achievable strategy to improve the immune effect of DNA vaccine against MSRV infection. FISH & SHELLFISH IMMUNOLOGY 2022; 131:1101-1108. [PMID: 36372202 DOI: 10.1016/j.fsi.2022.11.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 10/22/2022] [Accepted: 11/06/2022] [Indexed: 06/16/2023]
Abstract
DNA vaccines, as an effective prophylactic technology to induce both humoral and cellular immune responses, have already been widely studied to prevent and control viral and bacterial infections in aquaculture. To find a more effective and safer way to control Micropterus salmoides rhabdovirus (MSRV) infection in largemouth bass, two different DNA vaccines expressing partial (pcDNA3.1-G2) and full-length (pcDNA3.1-G) of the MSRV G protein were developed and injected intramuscularly with different doses. The immune effect was comprehensively compared and evaluated by detecting immune-related parameters including serum antibody levels, immune-related physiological indexes, immune-related gene expression and relative survival rates in this study. The results showed that compared with the pcDNA3.1-G vaccine, the pcDNA3.1-G2 vaccine induced higher serum antibody levels, a lower nonspecific immune response in serum (ACP, SOD and T-AOC activities), higher immune-related gene expression and a higher relative survival rate. Moreover, the immune effect of pcDNA3.1-G2-vaccinated fish showed gradually higher with the increasing pcDNA3.1-G2 concentration, especially in pcDNA3.1-G2 (10μg/per fish) group, the relative survival rate reached to 82.5%, which was significant higher (p < 0.05) than pcDNA3.1-G (10μg/per fish) group. This study indicated that screening the potential core part of an antigen is an achievable strategy to improve the immunogenicity and immunoprotective effect of DNA vaccine.
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Affiliation(s)
- Rui Ma
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518057, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Weichao Chen
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518057, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zirao Guo
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518057, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Yijun Jia
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518057, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Bin Zhu
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518057, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Erlong Wang
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518057, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China.
| | - Gaoxue Wang
- Northwest A&F University Shenzhen Research Institute, Shenzhen, Guangdong, 518057, China; College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China.
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12
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Jia YJ, Xia JY, Jiang FY, Li Y, Chen G, Zhu B. Antigenic epitope screening and functional modification of mannose enhance the efficacy of largemouth bass virus subunit vaccines. JOURNAL OF FISH DISEASES 2022; 45:1635-1643. [PMID: 35841600 DOI: 10.1111/jfd.13686] [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: 03/01/2022] [Revised: 06/17/2022] [Accepted: 06/22/2022] [Indexed: 06/15/2023]
Abstract
Major capsid protein (MCP) can be used as a subunit vaccine against largemouth bass virus (LMBV). However, subunit vaccines usually have low immunogenicity. Here, to identify the major immunogenicity determinant region of the MCP gene, we truncated the MCP of the LMBV gene into four parts (MCP-1, MCP-2, MCP-3 and MCP-4). Enzyme-linked immunosorbent assay (ELISA) was used to identify the antigenicity of these four truncated MCP proteins. Then, the highly antigenic truncated protein was modified with mannose and connected with functionalized single-walled carbon nanotubes (SWCNTs) as carriers. Largemouth basses were immunized by bath immersion, challenged with LMBV on the 28th day after immunization and evaluated for related immune indicators. The results indicated that the MCP-2 protein could induce a higher antibody titre than the other truncated MCP proteins. We found that the levels of immune-related genes (TNF-α, CD40, IgM, IFNγ and IL-10) in the spleen and kidney were significantly increased in the MCP-2 and MCP-2-Man groups. ELISA results showed that the antibody content in the serum increased significantly in the MCP-2 group 7 days post-vaccination and increased with days in all the vaccinated groups, with the highest observed on the 21st day. Notably, the MCP-2-Man vaccine (10 mg L-1 ) showed durability of immunoprotection efficacy that could protect largemouth basses from LMBV challenge, and the immune protection rate reached 78.94%. These results suggest that MCP-2 might be the major immunogenicity determinant region of LMBV and that the mannose-modified MCP-2 vaccine can induce stronger adaptive immune responses.
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Affiliation(s)
- Yi-Jun Jia
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jun-Yao Xia
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Fu-Yi Jiang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Yang Li
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Guo Chen
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
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13
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Xu FF, Jiang FY, Zhou GQ, Xia JY, Yang F, Zhu B. The recombinant subunit vaccine encapsulated by alginate-chitosan microsphere enhances the immune effect against Micropterus salmoides rhabdovirus. JOURNAL OF FISH DISEASES 2022; 45:1757-1765. [PMID: 35944110 DOI: 10.1111/jfd.13697] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 07/20/2022] [Accepted: 07/22/2022] [Indexed: 06/15/2023]
Abstract
The disease caused by Micropterus salmoides rhabdovirus (MSRV) has brought substantial economic losses to the largemouth bass aquaculture industry in China. Vaccination was considered as a potential way to prevent and control this disease. As a kind of sustained and controlled release system, alginate and chitosan microspheres (SA-CS) are widely used in the development of oral vaccination for fish. Here, we prepared a king of alginate-chitosan composite microsphere to encapsulate the second segment of MSRV glycoprotein (G2 protein) and then evaluated the immune effect of the microsphere vaccine on largemouth bass. Largemouth bass were vaccinated via intragastric immunization by different treatments (PBS, SA-CS, G2 and SA-CS-G2). The results showed that a stronger immune response including serum antibody levels, immune-related physiological indexes (acid phosphatase, alkaline phosphatase, superoxide dismutase and total antioxidant capacity) and the expression of immune-related gene (IgM、IL-8、IL-1β、CD4、TGF-β、TNF-α) can be induced obviously with SA-CS-G2 groups compared with G2 groups when fish were vaccinated. Furthermore, fish were injected with a lethal dose of MSRV after immunization for 28 days, and the highest relative percentage survival (54.8%) was observed in SA-CS-G2 group (40 μg per fish), which is significantly higher than that of G2 group (25.8%). This study showed that alginate-chitosan microspheres as the vaccine carrier can effectively improve the immune effect of oral vaccination and induce better immune protection effect against MSRV infection.
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Affiliation(s)
- Fei-Fan Xu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Fu-Yi Jiang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Guo-Qing Zhou
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jun-Yao Xia
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Fei Yang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
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14
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Zhao Z, Jiang FY, Zhou GQ, Duan HX, Xia JY, Zhu B. Protective immunity against spring viremia of carp virus by mannose modified chitosan loaded DNA vaccine. Virus Res 2022; 320:198896. [PMID: 35977626 DOI: 10.1016/j.virusres.2022.198896] [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: 07/04/2022] [Revised: 08/06/2022] [Accepted: 08/13/2022] [Indexed: 11/25/2022]
Abstract
Spring viremia of carp virus (SVCV) usually be considered as one of the serious in viral diseases of aquaculture, and DNA vaccine with novel delivery mechanism or adjuvant has proven to be a promising and effective strategy to control aquatic animal diseases. In this study, the mannose-modified chitosan, a carrier system for vaccine delivery, were used to developed a chitosan-encapsulated DNA vaccine (CS-M-G) against SVCV, then investigated immune response induced by the vaccine. Our results showed that CS-M-G was confirmed the spherical or elliptical with even distribution and ranging from approximately 50 to 150 nm in size, the expression of the antigen gene could still be detected after 21 d post vaccination. The CS-M-G induces the highest antibody levels in the 20 μg dose group which is about 3 times than naked plasmid group at 21 d post vaccination, and still hold a higher level than control group at 28 d post vaccination. On the side, strongest protection with relative percent survival of 62.1% in the 20 μg CS-M-G group, which could produce significantly higher enzyme activities and up-regulated expression of immune-associated genes than control group. Thus, our results indicate that DNA vaccine loaded with mannose-modified chitosan induces strong immune response and provided an effective protection against SVCV infection, may be helpful and extended for developing more aquatic animal vaccines in the future.
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Affiliation(s)
- Zhao Zhao
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Fu-Yi Jiang
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Guo-Qing Zhou
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Hui-Xin Duan
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Jun-Yao Xia
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Xinong Road 22nd, Yangling, Shaanxi 712100, China.
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15
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Fei H, Yi SF, Zhang HM, Cheng Y, Zhang YQ, Yu X, Qian SC, Huang MM, Yang S. Transcriptome and 16S rRNA analysis revealed the response of largemouth bass (Micropterus salmoides) to Rhabdovirus infection. Front Immunol 2022; 13:973422. [PMID: 36275642 PMCID: PMC9585208 DOI: 10.3389/fimmu.2022.973422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Accepted: 09/26/2022] [Indexed: 11/23/2022] Open
Abstract
To better understand the response of largemouth bass (Micropterus salmoides) to Micropterus salmoides rhabdovirus (MSRV) infection, we investigated the intestinal bacterial flora and transcriptome profile of fish at 72 hours post-infection (hpi). Total of 1574 differentially expressed genes (DEGs) were identified in largemouth bass spleen following MSRV infection, including 573 upregulated and 1001 downregulated genes. KEGG and GO enrichment analysis revealed that upregulated genes were enriched in certain antiviral related signaling pathway, including NOD-like receptor (NLR), RIG-I like receptors (RLR) and regulation of the interferon (IFN)-γ-mediated signaling pathway, whereas some immune-related DEGs enriched in focal adhesion (FA) and ECM-receptor interaction(ECM-RI) were downregulated, as well as genes associated with metabolic processes, such as peroxisome proliferator-activated receptors (PPAR), adipocytokine signaling pathway, Glycerolipid and Retinol metabolism. Furthermore, the principal component analysis (PCA) and phylogenetic analysis revealed that MSRV infection significantly affected the microbiota of largemouth bass intestine; the LEfSe analysis showed that relative abundances of Streptococcus were significantly increased, while the content of Akkermansia, Enterococcus and Lactobacillus were remarkably decreased in the fish intestine following MSRV infection. Additionally, a high correlation was determined between the expressions of interferon-related upregulated genes and the relative abundance of Streptococcus by redundancy analysis (RDA). These results collectively illustrated that intestinal microbiota composition might be associated with the immune-related gene expression in largemouth bass in response to MSRV infection.
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Affiliation(s)
- Hui Fei
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Shun fa Yi
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Hui min Zhang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yan Cheng
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Ya qi Zhang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Xiang Yu
- Department of Industrilaztion, Zhejiang Development & Planning Institute, Hangzhou, China
| | - Shi chao Qian
- Department of Fish disease, Huzhou Baijiayu Biotech Co., Ltd., Huzhou, China
| | - Meng meng Huang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Shun Yang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
- *Correspondence: Shun Yang,
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16
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Yang B, Guo ZR, Zhao Z, Wang T, Yang F, Ling F, Zhu B, Wang GX. Protective immunity by DNA vaccine against Micropterus salmoides rhabdovirus. JOURNAL OF FISH DISEASES 2022; 45:1429-1437. [PMID: 35930453 DOI: 10.1111/jfd.13672] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 06/03/2022] [Accepted: 06/09/2022] [Indexed: 06/15/2023]
Abstract
Micropterus salmoides rhabdovirus (MSRV) is one of the common pathogens in the largemouth bass industry, which can cause lethal diseases in juvenile fish and enormous economic losses. To establish effective means to prevent MSRV infection, the pcDNA3.1-G plasmid containing the MSRV glycoprotein gene was successfully constructed and intramuscularly injected into the largemouth bass to evaluate the immune responses and protective effects in our study. As the results showed, the serum antibody levels of the fish vaccinated with different doses of pcDNA3.1-G were significantly higher compared with the control groups (PBS and pcDNA3.1). Meanwhile, the immune parameters (acid phosphatase and alkaline phosphatase) were also significantly up-regulated. Several immune-related genes (IgM, IL-8, IL-12p40 and CD40) were expressed in the pcDNA3.1-G groups at higher levels than in the control groups, which indicated that strong immune responses were induced. Besides, the survival percentages of fish in the control groups (PBS and pcDNA3.1) and pcDNA3.1-G groups (2.5, 5, 10 and 20 μg/fish) at 14 days after challenge experiment with MSRV were 0%, 0%, 6.1%, 15.2%, 29.0% and 48.5% respectively. This study indicated that pcDNA3.1-G was a prospective DNA vaccine candidate against MSRV-induced mortality.
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Affiliation(s)
- Bin Yang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Zi-Rao Guo
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Zhao Zhao
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Tao Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Fei Yang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Fei Ling
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Gao-Xue Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
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17
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Li BY, Yang F, Zhang ZY, Shen YF, Wang T, Zhao L, Qin JC, Ling F, Wang GX. Quinoline, with the active site of 8-hydroxyl, efficiently inhibits Micropterus salmoides rhabdovirus (MSRV) infection in vitro and in vivo. JOURNAL OF FISH DISEASES 2022; 45:895-905. [PMID: 35445749 DOI: 10.1111/jfd.13615] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 03/17/2022] [Accepted: 03/24/2022] [Indexed: 06/14/2023]
Abstract
Micropterus salmoides rhabdovirus (MSRV) is an significant pathogen that causes high mortality and related economic losses in bass aquaculture. There is no effective or approved therapy to date. In this study, we evaluated the anti-MSRV effects of 22 quinoline derivatives in grass carp ovary (GCO) cells. Among these compounds, 8-hydroxyquinoline exhibited valid inhibition in decreasing MSRV nucleoprotein gene expression levels of 99.3% with a half-maximal inhibitory concentrations (IC50 ) value of 4.66 μM at 48 h. Moreover, 8-hydroxyquinoline significantly enhanced a protective effect in GCO cells by reducing the cytopathic effect (CPE). By comparing the anti-MSRV activity of 22 quinoline derivatives, we found that 8-hydroxyquinoline possessed the efficient active site of 8-hydroxyl and inhibited MSRV infection in vitro. For in vivo studies, 8-hydroxyquinoline via intraperitoneal injection exhibited an antiviral effect in MSRV-infected largemouth bass by substantially enhancing the survival rate by 15.0%. Importantly, the viral loads in the infected largemouth bass notably reduced in the spleen on the third days post-infection. Overall, 8-hydroxyquinoline was considered to be an efficient agent against MSRV in aquaculture.
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Affiliation(s)
- Bo-Yang Li
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Fei Yang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Zhong-Yu Zhang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Yu-Feng Shen
- Changzhou Agricultural Comprehensive Technology Extension Center, Changzhou, Jiangsu, China
| | - Tao Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Liang Zhao
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Jia-Cheng Qin
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Fei Ling
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
| | - Gao-Xue Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi, China
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18
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Isolation, Identification and Characteristics of Aeromonas caviae from Diseased Largemouth Bass (Micropterus salmoides). FISHES 2022. [DOI: 10.3390/fishes7030119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The largemouth bass (Micropterus salmoides) is one of the most economically valuable fish species in China. In this study, a bacterial pathogen was isolated from the internal organs of diseased M. salmoides, and the strain was named WH21406. This isolate was identified as Aeromonas caviae on the basis of its morphology, biochemical features and 16S rDNA phylogenetic analysis. Four virulence genes related to pathogenicity, namely, flagella (fla), elastase (ela), haemolysin (hly) and aerolysin (aer), were detected in this isolate. The median lethal dosage (LD50) of A. caviae WH21406 for M. salmoides was calculated to be 3.46 × 105 CFU mL−1. The histopathological analysis showed obvious tissue damage in the gill, liver, kidney, spleen and gut of the diseased fish. The antibiotic susceptibility test demonstrated that strain WH21406 was highly sensitive to enrofloxacin, norfloxacin, streptomycin and amikacin. The results of this study provide a foundation for the diagnosis, prevention and treatment of A. caviae infection in M. salmoides.
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19
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Earlier Activation of Interferon and Pro-Inflammatory Response Is Beneficial to Largemouth Bass (Micropterus salmoides) against Rhabdovirus Infection. FISHES 2022. [DOI: 10.3390/fishes7020090] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In order to understand the immune response of largemouth bass against Micropterus salmoides Rhabdovirus (MSRV), assisting disease resistance breeding, three largemouth bass breeding varieties Micropterus salmoides “Youlu No 3” (U3), “Youlu No 1” (U1) and “Zhelu No 1” (P1) were challenged intraperitoneally with MSRV. Serum and tissues were sampled to study the changes in non-specific immune parameters, viral loads, and transcript levels of immune-related genes, and the cumulative mortality rate was recorded daily for 14 days. The results showed that the cumulative mortality rates in the U1, P1, and U3 groups were 6.66% ± 2.89%, 3.33% ± 2.89%, and 0, respectively. The higher mortality may attribute to the increased viral loads after infection in the liver (2.79 × 105 and 2.38 × 105 vs. 1.3 × 104 copies/mg), spleen (2.14 × 105 and 9.40 × 104 vs. 4.21 × 103 copies/mg), and kidney (3.59 × 104 and 8.40 × 103 vs. 2.42 × 103 copies/mg) in the U1 and P1 groups compared to the U3 group. The serum non-specific immune parameters (lysozyme, catalase, and acid phosphatase) were found to be increased significantly in the U3 group. In addition, the transcripts of interferon-related genes (IFN-γ, IRF3, and IRF7) and pro-inflammatory-related genes (TNF-α and IL-1β) exhibited up-regulation and peaked at 6 h post infection in the U3 group, which also exhibited up-regulation but peaked at 12–24 h post infection in the U1 and P1 groups. In conclusion, these findings indicate that earlier activation of interferon and pro-inflammatory response is beneficial to largemouth bass against MSRV infection. This experiment may provide an insight into understanding the immune mechanism of largemouth bass against MSRV infection and contributes to molecular-assisted selection.
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Mannose Receptor-Mediated Carbon Nanotubes as an Antigen Delivery System to Enhance Immune Response Both In Vitro and In Vivo. Int J Mol Sci 2022; 23:ijms23084239. [PMID: 35457058 PMCID: PMC9030879 DOI: 10.3390/ijms23084239] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/26/2022] [Accepted: 04/04/2022] [Indexed: 02/05/2023] Open
Abstract
Carbon nanotubes (CNTs) are carbon allotropes consisting of one, two, or more concentric rolled graphene layers. These can intrinsically regulate immunity by activating the innate immune system. Mannose receptors (MR), a subgroup of the C-type lectin superfamily, are abundantly expressed on macrophages and dendritic cells. These play a crucial role in identifying pathogens, presenting antigens, and maintaining internal environmental stability. Utilizing the specific recognition between mannose and antigen-presenting cells (APC) surface mannose receptors, the antigen-carrying capacity of mannose-modified CNTs can be improved. Accordingly, here, we synthesized the mannose-modified carbon nanotubes (M-MWCNT) and evaluated them as an antigen delivery system through a series of in vitro and in vivo experiments. In vitro, M-MWCNT carrying large amounts of OVA were rapidly phagocytized by macrophages and promoted macrophage proliferation to facilitate cytokines (IL-1β, IL-6) secretion. In vivo, in mice, M-MWCNT induced the maturation of dendritic cells and increased the levels of antigen-specific antibodies (IgG, IgG1, IgG2a, IgG2b), and cytokines (IFN-γ, IL-6). Taken together, M-MWCNT could induce both humoral and cellular immune responses and thereby can be utilized as an efficient antigen-targeted delivery system.
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Yao JY, Zhang CS, Yuan XM, Huang L, Hu DY, Yu Z, Yin WL, Lin LY, Pan XY, Yang GL, Wang CF, Shen JY, Zhang HQ. Oral Vaccination With Recombinant Pichia pastoris Expressing Iridovirus Major Capsid Protein Elicits Protective Immunity in Largemouth Bass (Micropterus salmoides). Front Immunol 2022; 13:852300. [PMID: 35309312 PMCID: PMC8931665 DOI: 10.3389/fimmu.2022.852300] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 02/07/2022] [Indexed: 11/13/2022] Open
Abstract
Largemouth bass iridovirus (LMBV) can cause high mortality and lead to heavy economic loss in the cultivation of largemouth bass, but there was no effective treatment. Here, the present study constructed a recombinant Pichia pastoris expressing LMBV major capsid protein (MCPD). The recombinant GS115-pW317-MCPD was then used to immunize largemouth bass via oral administration, and mucosal immune response mediated by immunoglobulins (Igs) was measured after oral immunization. Serum antibody levels were measured by ELISA, neutralizing antibody titers were determined by serum neutralization test (SNT), antigen presentation-related gene expressions were detected by RT-PCR, and the histopathological characteristics of immunized fish were assessed after challenging with 0.1 ml 107.19 TCID50/ml LMBV. The relative percentage survival (RPS) was also determined. Our results showed that the serum antibody titers of immunized fish were significantly higher than that of control groups (P < 0.05). IgT and IgM expressions in gut were increased significantly after vaccination with GS115-pW317-MCPD; however, much stronger response in gut was observed as compared with gill. The expression levels of major histocompatibility complex (MHC) II, CD8, and T-cell receptor (TCR) were significantly elevated in GS115-pW317-MCPD group (P < 0.05), while CD4 and MHC I transcription levels remained unchanged after oral immunization (P > 0.05). The RPS of fish orally immunized with 1.0 × 108 CFU/g GS115-pW317-MCPD was reached up to 41.6% after challenge with 0.1 ml 109.46 TCID50/ml LMBV. Moreover, orally immunizing with GS115-pW317-MCPD can relieve the pathological damage caused by LMBV. Therefore, GS115-pW317-MCPD showed a promising potential against LMBV.
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Affiliation(s)
- Jia-Yun Yao
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
- *Correspondence: Jia-Yun Yao, ; Hai-Qi Zhang, ; Chun-Feng Wang,
| | - Cheng-Sai Zhang
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
| | - Xue-Mei Yuan
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
| | - Lei Huang
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
| | - Da-Yan Hu
- Development Center of Huzhou Agricultural Science and Technology, Huzhou, China
| | - Zhe Yu
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
| | - Wen-Lin Yin
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
| | - Ling-Yun Lin
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
| | - Xiao-Yi Pan
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
| | - Gui-lian Yang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - Chun-Feng Wang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
- *Correspondence: Jia-Yun Yao, ; Hai-Qi Zhang, ; Chun-Feng Wang,
| | - Jin-Yu Shen
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
| | - Hai-Qi Zhang
- Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture, Key Laboratory of Fish Health and Nutrition of Zhejiang Province, Zhejiang Institute of Freshwater Fisheries, Huzhou, China
- *Correspondence: Jia-Yun Yao, ; Hai-Qi Zhang, ; Chun-Feng Wang,
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Feng Z, Chu X, Han M, Yu C, Jiang Y, Wang H, Lu L, Xu D. Rapid visual detection of Micropterus salmoides rhabdovirus using recombinase polymerase amplification combined with lateral flow dipsticks. JOURNAL OF FISH DISEASES 2022; 45:461-469. [PMID: 34984680 DOI: 10.1111/jfd.13575] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 12/08/2021] [Accepted: 12/10/2021] [Indexed: 06/14/2023]
Abstract
Largemouth bass (Micropterus salmoides) is an important freshwater-cultured species in China. Recently, a lethal and epidemic disease caused by Micropterus salmoides rhabdovirus (MSRV) results in huge economic losses to the largemouth bass industry. Current diagnostics for detecting MSRV are limited in sensitivity and speed and are inconvenient to be used for non-laboratory detection. In this study, three rapid and convenient detection assays of MSRV by recombinase polymerase amplification (RPA) and lateral flow dipsticks (LFD), targeting the conserved sequences of the MSRV-SS N gene, are described. With these RPA methods, the detection could achieve within 50 min at 38°C. Both methods of RPA-AGE and RPA-LFD could detect the viral DNA as low as 170 copies/μl of the MSRV standard plasmid and were 100-fold more sensitive than that in the method of routine PCR. Meanwhile, these RPA methods were highly specific for the detection of MSRV and can be feasibly applied to the diagnostic of MSRV infection. In brief, RPA-AGE, RPA-LFD and RT-RPA-LFD provide convenient, rapid, sensitive and reliable methods that could improve field diagnosis of MSRV with limited machine resources, and would enhance the production of largemouth bass.
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Affiliation(s)
- Zizhao Feng
- College of Fisheries and life science, Shanghai Ocean University, Shanghai, China
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, China
- Key Laboratory of Aquaculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - Xin Chu
- College of Fisheries and life science, Shanghai Ocean University, Shanghai, China
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, China
- Key Laboratory of Aquaculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - Minzhen Han
- College of Fisheries and life science, Shanghai Ocean University, Shanghai, China
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, China
- Key Laboratory of Aquaculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - Chenwei Yu
- College of Fisheries and life science, Shanghai Ocean University, Shanghai, China
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, China
- Key Laboratory of Aquaculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - Yousheng Jiang
- College of Fisheries and life science, Shanghai Ocean University, Shanghai, China
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, China
- Key Laboratory of Aquaculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
- National Experimental Teaching Demonstration Center for Fishery Sciences, Shanghai Ocean University, Shanghai, China
| | - Hao Wang
- College of Fisheries and life science, Shanghai Ocean University, Shanghai, China
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, China
- Key Laboratory of Aquaculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
- National Experimental Teaching Demonstration Center for Fishery Sciences, Shanghai Ocean University, Shanghai, China
| | - Liqun Lu
- College of Fisheries and life science, Shanghai Ocean University, Shanghai, China
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, China
- Key Laboratory of Aquaculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
- National Experimental Teaching Demonstration Center for Fishery Sciences, Shanghai Ocean University, Shanghai, China
| | - Dan Xu
- College of Fisheries and life science, Shanghai Ocean University, Shanghai, China
- National Pathogen Collection Center for Aquatic Animals, Shanghai Ocean University, Shanghai, China
- Key Laboratory of Aquaculture Ministry for Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
- National Experimental Teaching Demonstration Center for Fishery Sciences, Shanghai Ocean University, Shanghai, China
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Gong YM, Zhang C, Li Y, Chen G, Wang GX, Zhu B. Optimization of immunization procedure for SWCNTs-based subunit vaccine with mannose modification against spring viraemia of carp virus in common carp. JOURNAL OF FISH DISEASES 2021; 44:1925-1936. [PMID: 34383969 DOI: 10.1111/jfd.13506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 07/25/2021] [Accepted: 07/28/2021] [Indexed: 05/19/2023]
Abstract
Immersion vaccination of single-walled carbon nanotubes loaded with mannose-modified glycoprotein (SWCNTs-MG) vaccine has been proved to be effective in preventing spring viraemia of carp virus (SVCV). Immunization procedure has immense consequence on the immune effect of the immersion vaccine. However, immunization procedure optimization for SWCNTs-MG vaccine against SVCV has not been reported. In this study, accordingly, a full-factor experiment was designed to optimize the immunization procedure of SWCNTs-MG vaccine by three aspects of vaccine dose (30 mg/L, 40 mg/L and 50 mg/L), immunization density (8 fish L-1 , 24 fish L-1 and 48 fish L-1 ) and immunization time (6, 12 and 24 hr). Furthermore, we used the immunization group (A1B2C1, 30 mg/L, 24 fish L-1 and 6 hr) in the previous study as a positive control (PC) to evaluate the immunization effect optimized conditions from the expression of immune-related genes and relative percentage survival (RPS). At 28 days post-vaccination (DPV), common carps were intraperitoneal injected SVCV challenged test indicated that the A1B2C2 group (30 mg/L, 24 fish L-1 , 12 hr) displayed superiority of protective efficacy compare with other groups and the RPS with 77.9%, which was 15.6% higher than the PC group of RPS with 62.3%. Moreover, the expression of immune-related genes such as IL-10, CD4 and MHC-II was also significantly higher than PC group. The specific experimental flow chart is shown in Figure 1. Conclusively, these results demonstrated that vaccine dose, immunization density and immunization time are 30 mg/L, 24 fish L-1 and 12 hr, which is the more appropriate immunization programme with juvenile carp for SWCNTs-MG vaccine. This study provides a profitable reference for improving the immune efficiency of aquatic immersion vaccine. [Figure: see text].
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Affiliation(s)
- Yu-Ming Gong
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Chen Zhang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Yang Li
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Guo Chen
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Gao-Xue Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
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Duan HX, Zhao Z, Jin YJ, Wang ZL, Deng JF, He J, Zhu B. PEG-modified subunit vaccine encoding dominant epitope to enhance immune response against spring viraemia of carp virus. JOURNAL OF FISH DISEASES 2021; 44:1587-1594. [PMID: 34165796 DOI: 10.1111/jfd.13481] [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: 04/30/2021] [Revised: 06/09/2021] [Accepted: 06/11/2021] [Indexed: 06/13/2023]
Abstract
Spring viraemia of carp (SVC) caused by spring viraemia of carp virus (SVCV) can infect almost all fish of cyprinids, which bring huge economic losses to aquaculture. Glycoprotein (G), as the most important antigenic determinant protein of SVCV, is widely considered as an effective method against SVCV. In our previous study, we found that G3 (131 aa) is the potential dominant antigen epitope that induces strong immune responses similar to G protein (510 aa). Here, in order to further improve the immune effect, we reported a subunit vaccine (PEG-G3) constructed by PEG-modified dominant epitope protein (G3). The results of serum antibody production, enzyme activities and immune-related genes expression showed that PEG-G3 induces significantly stronger immune protective responses against SVCV than G3. PEG modification significantly increased the serum antibody level of the vaccine, which increased significantly after immunization and reached the peak at 21 day post-vaccination. T-AOC and AKP activities in the lowest concentration group (5 μg) of PEG-G3 were significantly higher than those in the highest concentration group (20 μg) of G3. In PEG-G3 group, the expression of almost all genes increased at least 4 times compared with the control group. After 14-day challenge, the RPS (relative percentage survival) of the highest concentration of PEG-G3 group was 53.6%, while that of G3 group is 38.9%. Therefore, this work shows that PEG modification and dominant epitope screening may be effective methods to improve the immune protective effect of vaccines and to resist the infection of aquatic animal viral diseases.
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Affiliation(s)
- Hui-Xin Duan
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Zhao Zhao
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Ying-Jie Jin
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Zi-Long Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jie-Fang Deng
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Jie He
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Yangling, China
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Lu L, Duong VT, Shalash AO, Skwarczynski M, Toth I. Chemical Conjugation Strategies for the Development of Protein-Based Subunit Nanovaccines. Vaccines (Basel) 2021; 9:563. [PMID: 34071482 PMCID: PMC8228360 DOI: 10.3390/vaccines9060563] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/26/2021] [Accepted: 05/26/2021] [Indexed: 12/11/2022] Open
Abstract
The production of subunit nanovaccines relies heavily on the development of a vaccine delivery system that is safe and efficient at delivering antigens to the target site. Nanoparticles have been extensively investigated for vaccine delivery over the years, as they often possess self-adjuvanting properties. The conjugation of antigens to nanoparticles by covalent bonds ensures co-delivery of these components to the same subset of immune cells in order to trigger the desired immune responses. Herein, we review covalent conjugation strategies for grafting protein or peptide antigens onto other molecules or nanoparticles to obtain subunit nanovaccines. We also discuss the advantages of chemical conjugation in developing these vaccines.
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Affiliation(s)
| | | | | | - Mariusz Skwarczynski
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, QLD 4072, Australia; (L.L.); (V.T.D.); (A.O.S.)
| | - Istvan Toth
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, QLD 4072, Australia; (L.L.); (V.T.D.); (A.O.S.)
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Zhao Z, Xiong Y, Zhang C, Jia YJ, Qiu DK, Wang GX, Zhu B. Optimization of the efficacy of a SWCNTs-based subunit vaccine against infectious spleen and kidney necrosis virus in mandarin fish. FISH & SHELLFISH IMMUNOLOGY 2020; 106:190-196. [PMID: 32755683 DOI: 10.1016/j.fsi.2020.07.062] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/22/2020] [Accepted: 07/29/2020] [Indexed: 06/11/2023]
Abstract
Infectious spleen and kidney necrosis virus (ISKNV) cause a high mortality disease which brings substantial economic losses to the mandarin fish culture industry in China. This study was aimed at optimizing the efficacy of a SWCNTs-based immersion subunit vaccine (SWCNTs-M-MCP) which as a promising vaccine against ISKNV. Mandarin fish were vaccinated by immersion, then we designed an orthogonal experiment to optimize different parameters affecting vaccination such as immune duration of bath immunization, immune dose, and fish density when immunized. Our results showed that the highest relative percent survival (86.7%) was found in the group 6 with 8 h of immune duration, 20 mg/L of immune dose, and 8 fish per liter of fish density. And other immune responses (serum antibody production, enzyme activities, and immune-related genes expression) also demonstrated similar results. In addition, the expression of IRF-I in group 6 (8 h, 20 mg/L, 8 fish per liter) was significant extents, and about 16-folds increases were obtained than the control group at 21 d post-vaccination. And the highest specific antibody response was significantly increased (more than 4-folds) than control group which was found in group 6. The optimum immune duration, immune dose, and fish density of SWCNTs-M-MCP were 8 h, 20 mg/L, 8 fish per liter, respectively. Importantly, our results also showed that immune duration had the greatest effect on the immune response of our vaccine, followed by immune dose. The study reported herein provides a helpful reference for the effective use of vaccine in fish farming industry.
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Affiliation(s)
- Zhao Zhao
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China
| | - Yan Xiong
- Yunnan Institute of Fishery Sciences Research, Kunmin, 650224, China
| | - Chen Zhang
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China
| | - Yi-Jun Jia
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China
| | - De-Kui Qiu
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China
| | - Gao-Xue Wang
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China.
| | - Bin Zhu
- College of Animal Science and Technology, Northwest A&F University, Yangling, 712100, China.
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