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Kaur M, Mingeot-Leclercq MP. Maintenance of bacterial outer membrane lipid asymmetry: insight into MlaA. BMC Microbiol 2024; 24:186. [PMID: 38802775 PMCID: PMC11131202 DOI: 10.1186/s12866-023-03138-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 11/29/2023] [Indexed: 05/29/2024] Open
Abstract
The outer membrane (OM) of Gram-negative bacteria acts as an effective barrier to protect against toxic compounds. By nature, the OM is asymmetric with the highly packed lipopolysaccharide (LPS) at the outer leaflet and glycerophospholipids at the inner leaflet. OM asymmetry is maintained by the Mla system, in which is responsible for the retrograde transport of glycerophospholipids from the OM to the inner membrane. This system is comprised of six Mla proteins, including MlaA, an OM lipoprotein involved in the removal of glycerophospholipids that are mis-localized at the outer leaflet of the OM. Interestingly, MlaA was initially identified - and called VacJ - based on its role in the intracellular spreading of Shigella flexneri.Many open questions remain with respect to the Mla system and the mechanism involved in the translocation of mislocated glycerophospholipids at the outer leaflet of the OM, by MlaA. After summarizing the current knowledge on MlaA, we focus on the impact of mlaA deletion on OM lipid composition and biophysical properties of the OM. How changes in OM lipid composition and biophysical properties can impact the generation of membrane vesicles and membrane permeability is discussed. Finally, we explore whether and how MlaA might be a candidate for improving the activity of antibiotics and as a vaccine candidate.Efforts dedicated to understanding the relationship between the OM lipid composition and the mechanical strength of the bacterial envelope and, in turn, how such properties act against external stress, are needed for the design of new targets or drugs for Gram-negative infections.
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Affiliation(s)
- M Kaur
- Louvain Drug Research Institute, Université catholique de Louvain, Unité de Pharmacologie cellulaire et moléculaire, B1.73.05; 73 Av E. Mounier, Brussels, 1200, Belgium
| | - M-P Mingeot-Leclercq
- Louvain Drug Research Institute, Université catholique de Louvain, Unité de Pharmacologie cellulaire et moléculaire, B1.73.05; 73 Av E. Mounier, Brussels, 1200, Belgium.
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Ma Y, Hao L, Liang Z, Ma J, Ke H, Kang H, Yang H, Wu J, Feng G, Liu Z. Characterization of novel antigenic vaccine candidates for nile tilapia (Oreochromis niloticus) against Streptococcus agalactiae infection. FISH & SHELLFISH IMMUNOLOGY 2020; 105:405-414. [PMID: 32712231 DOI: 10.1016/j.fsi.2020.07.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 06/23/2020] [Accepted: 07/13/2020] [Indexed: 06/11/2023]
Abstract
Streptococcus agalactiae is one of the important pathogens responsible for high mortality and economic losses of the tilapia industry worldwide. Based on ten serovars of S. agalactiae infection, subunit vaccine with conserved antigens is promising strategy corresponding stimulated long-term immunity and provides protection for animals against different serotypes of S. agalactiae. In the present study, eight proteins (AP, AL, LivK, ESAT6, essA, essB, essC and esaA) were selected from the S. agalactiae serotype Ia genome as immunogenic antigens with bioinformation and immune experiment assays. These recombinant proteins were successfully obtained through expression in Escherichia coli and the immunogenicity was assessed in tilapia challenge model. The results showed that the recombinant proteins caused high-level-specific antibodies production and high lysozyme activities, suggesting that the recombinant proteins induced specific humoral immune response and innate immune response of tilapia. The signficant increase were observed in the cytokines levels of TNF-α, IL-1β, IFN-γ, cc1, cc2 and immune-related genes levels of CD8α and MHC factors in the spleen and head kidney tissues, suggesting that the recombinant proteins induced immune response of tilapia through cytokines signal pathway and activated high cytotoxic T-lymphocyte (CTL) activity of tilapia. Furthermore, vaccinated tilapia conferred high levels of protection against challenge with a lethal dose of highly virulent serovar Ⅰa (highest RPS was 91.60% in AL and essC protein groups). Our results indicated that the eight recombinant proteins induced high level of immune responses and offered protection against S. agalactiae infection, could be potential subunit vaccine candidates.
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Affiliation(s)
- Yanping Ma
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences; Key Laboratory of Livestock Disease Prevention of Guangdong Province; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, PRC, Guangzhou, China
| | - Le Hao
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences; Key Laboratory of Livestock Disease Prevention of Guangdong Province; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, PRC, Guangzhou, China
| | - Zhiling Liang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences; Key Laboratory of Livestock Disease Prevention of Guangdong Province; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, PRC, Guangzhou, China
| | - Jiangyao Ma
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences; Key Laboratory of Livestock Disease Prevention of Guangdong Province; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, PRC, Guangzhou, China
| | - Hao Ke
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences; Key Laboratory of Livestock Disease Prevention of Guangdong Province; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, PRC, Guangzhou, China
| | - Huahua Kang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences; Key Laboratory of Livestock Disease Prevention of Guangdong Province; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, PRC, Guangzhou, China; Zhaoqing Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Zhaoqing, China
| | - Hongwei Yang
- College of Animal Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, China
| | - Jing Wu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Guoqing Feng
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences; Key Laboratory of Livestock Disease Prevention of Guangdong Province; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, PRC, Guangzhou, China
| | - Zhenxing Liu
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences; Key Laboratory of Livestock Disease Prevention of Guangdong Province; Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province, Ministry of Agriculture and Rural Affairs, PRC, Guangzhou, China.
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3
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Tao Y, Yang R, Shu J, Zheng W, Chen J, Wu Y, He Y. Immune responses induced by a combined vaccination with a recombinant chimera of Mycoplasma hyopneumoniae antigens and capsid virus-like particles of porcine circovirus type 2. BMC Vet Res 2020; 16:342. [PMID: 32938456 PMCID: PMC7493066 DOI: 10.1186/s12917-020-02560-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 09/08/2020] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Mycoplasma hyopneumoniae (Mhp) and porcine circovirus type 2 (PCV2) are two important pathogens causing Mycoplasma pneumonia of swine (MPS) and porcine circovirus diseases and porcine circovirus-associated diseases (PCVDs/PCVADs), respectively, and resulted in considerable economic loss to the swine industry worldwide. Currently, vaccination is one of the main measures to control these two diseases; however, there are few combination vaccines that can prevent these two diseases. To determine the effect of combination immunization, we developed capsid-derived (Cap) virus-like particles (VLPs) of PCV2 and a new recombinant chimera composed of the P97R1, P46, and P42 antigens of Mhp. Then we investigated the immune responses induced by the immunization with this combination vaccine in mice and piglets. RESULTS The high level antibodies against three protein antigens (P97R1, P46, and P42 of Mhp) were produced after immunization, up to or higher than 1:400,000; the antibody levels in Pro group continuously increased throughout the 42 days for all the antigens tested. The lymphocyte proliferative response in PCV2 group was stronger than that in PBS, VP, Mhp CV in mice. The antibody levels for Cap remained stable and reached the peak at 35 DAI. The IFN-γ and IL-4 in sera were significantly enhanced in the Pro group than that in the negative control-VP group on Day 14 and 28 post-the first immunization in piglets. CONCLUSIONS Above all, the combination immunization could induce humoral and cellular immune responses against all four antigens in mice and piglets. Therefore, our approach is a simple and effective vaccination strategy to protect pigs against MPS and PCVD/PCVAD.
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Affiliation(s)
- Yu Tao
- Department of Biochemistry and Molecular Biology, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, China
| | - Rui Yang
- Department of Biochemistry and Molecular Biology, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, China
| | - Jianhong Shu
- Department of Biochemistry and Molecular Biology, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, China
| | - Wenqian Zheng
- Department of Biochemistry and Molecular Biology, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, China
| | - Jian Chen
- Department of Biochemistry and Molecular Biology, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, China
| | - Yuehong Wu
- Department of Biochemistry and Molecular Biology, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, China
| | - Yulong He
- Department of Biochemistry and Molecular Biology, College of Life Sciences and Medicine, Zhejiang Sci-Tech University, 928 Second Avenue, Xiasha Higher Education Zone, Hangzhou, 310018, China.
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Hau SJ, Luan SL, Loving CL, Nicholson TL, Wang J, Peters SE, Seilly D, Weinert LA, Langford PR, Rycroft AN, Wren BW, Maskell DJ, Tucker AW, Brockmeier SL. Evaluation of the recombinant proteins RlpB and VacJ as a vaccine for protection against Glaesserella parasuis in pigs. BMC Vet Res 2020; 16:167. [PMID: 32460764 PMCID: PMC7252510 DOI: 10.1186/s12917-020-02377-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 05/14/2020] [Indexed: 12/19/2023] Open
Abstract
BACKGROUND Glaesserella parasuis, the causative agent of Glӓsser's disease, is widespread in swine globally resulting in significant economic losses to the swine industry. Prevention of Glӓsser's disease in pigs has been plagued with an inability to design broadly protective vaccines, as many bacterin based platforms generate serovar or strain specific immunity. Subunit vaccines are of interest to provide protective immunity to multiple strains of G. parasuis. Selected proteins for subunit vaccination should be widespread, highly conserved, and surface exposed. RESULTS Two candidate proteins for subunit vaccination (RlpB and VacJ) against G. parasuis were identified using random mutagenesis and an in vitro organ culture system. Pigs were vaccinated with recombinant RlpB and VacJ, outer membrane proteins with important contributions to cellular function and viability. Though high antibody titers to the recombinant proteins and increased interferon-γ producing cells were found in subunit vaccinated animals, the pigs were not protected from developing systemic disease. CONCLUSIONS It appears there may be insufficient RlpB and VacJ exposed on the bacterial surface for antibody to bind, preventing high RlpB and VacJ specific antibody titers from protecting animals from G. parasuis. Additionally, this work confirms the importance of utilizing the natural host species when assessing the efficacy of vaccine candidates.
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Affiliation(s)
- Samantha J Hau
- USDA, ARS, National Animal Disease Center, 1920 Dayton Ave, Ames, IA, 50010, USA
| | - Shi-Lu Luan
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - Crystal L Loving
- USDA, ARS, National Animal Disease Center, 1920 Dayton Ave, Ames, IA, 50010, USA
| | - Tracy L Nicholson
- USDA, ARS, National Animal Disease Center, 1920 Dayton Ave, Ames, IA, 50010, USA
| | - Jinhong Wang
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - Sarah E Peters
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - David Seilly
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - Lucy A Weinert
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - Paul R Langford
- Section of Paediatric Infectious Diseases, Department of Infectious Disease, Imperial College London, St. Mary's Campus, London, UK
| | | | - Brendan W Wren
- Faculty of Infectious & Tropical Diseases, London School of Hygiene & Tropical Medicine, London, UK
| | - Duncan J Maskell
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK.,Current address: The University of Melbourne, Level 9, Raymond Priestley Building, Melbourne, Victoria, 3010, Australia
| | - Alexander W Tucker
- Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - Susan L Brockmeier
- USDA, ARS, National Animal Disease Center, 1920 Dayton Ave, Ames, IA, 50010, USA.
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Im YB, Park WB, Jung M, Kim S, Yoo HS. Comparative Analysis of Immune Responses to Outer Membrane Antigens OMP10, OMP19, and OMP28 of Brucella abortus. Jpn J Infect Dis 2018; 71:197-204. [PMID: 29709972 DOI: 10.7883/yoken.jjid.2017.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Brucella infection is accompanied by cytokine production, which serves as an important factor to evaluate the innate and adaptive immune responses. Several researchers have been investigating the mechanisms involved in Brucella infection in the host. Here, we conducted an analytical study to define pathogenic pathways and immune mechanisms involved in Brucella infection by investigating the antigenic efficacy of recombinant outer membrane protein 10 (rOMP10), outer membrane protein 19 (rOMP19), and outer membrane protein 28 (rOMP28) in vitro and in vivo upon stimulation/immunization. Cytokine production was analyzed by nitric oxide (NO) assay and enzyme-linked immunosorbent assay (ELISA) after stimulation of RAW 264.7 cells and naive splenocytes with the recombinant proteins. Our results show that levels of NO, tumor necrosis factor (TNF)-α, and interleukin (IL)-6 increased in RAW 264.7 cells in a time-dependent manner following recombinant protein stimulation. In contrast, levels of interferon (IFN)-γ and IL-2 increased in naive splenocytes after stimulation with proteins. ELISA and ELISpot assays were performed after immunization of mice with recombinant proteins. rOMP28 greatly increased IFN-γ, IL-2, and TNF-α levels than IL-4 and IL-6 levels in vitro. Of the recombinant proteins, rOMP19 elicited a mixed Th1/Th2 immune response by increasing the number of IgG-secreting cells in vivo.
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Affiliation(s)
- Young Bin Im
- Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University
| | - Woo Bin Park
- Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University
| | - Myunghwan Jung
- Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University
| | - Suk Kim
- College of Veterinary Medicine, Gyeongsang National University
| | - Han Sang Yoo
- Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University.,Institute of Green Bio Science and Technology, Seoul National University
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Ma YP, Ke H, Liang ZL, Ma JY, Hao L, Liu ZX. Protective efficacy of cationic-PLGA microspheres loaded with DNA vaccine encoding the sip gene of Streptococcus agalactiae in tilapia. FISH & SHELLFISH IMMUNOLOGY 2017; 66:345-353. [PMID: 28476676 DOI: 10.1016/j.fsi.2017.05.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 04/21/2017] [Accepted: 05/01/2017] [Indexed: 05/21/2023]
Abstract
Streptococcus agalactiae (S. agalactiae) is an important fish pathogen, which has received more attention in the past decade due to the increasing economic losses in the tilapia industry worldwide. As existing effective vaccines of S. agalactiae in fish have obvious disadvantage, to select immunoprotective antigens and package materials would undoubtedly contribute to the development of novel oral vaccines. In the present study, surface immunogenic protein (sip) was selected from the S. agalactiae serovar I a genomes as immunogenic protein in DNA vaccine form with cationic chitosan and biodegradable and biocompatible PLGA. The pcSip plasmid in cationic-PLGA was successfully expressed in tissues of immunized tilapia and the immunogenicity was assessed in tilapia challenge model. A significant increase was observed in the cytokine levels of IL-1β, TNF-α, CC1, CC2 in spleen and kidney tissues. Furthermore, immunized tilapia conferred different levels of protection against challenge with a lethal dose of highly virulent serovar I a S. agalactiae. Our results indicated that the pcSip plasmid in cationic-PLGA induced high level of antibodies and protection against S. agalactiae infection, could be effective oral DNA vaccine candidates.
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Affiliation(s)
- Yan-Ping Ma
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Guangdong Open Laboratory of Veterinary Public Health; Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Hao Ke
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Guangdong Open Laboratory of Veterinary Public Health; Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China.
| | - Zhi-Ling Liang
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Guangdong Open Laboratory of Veterinary Public Health; Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Jiang-Yao Ma
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Guangdong Open Laboratory of Veterinary Public Health; Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Le Hao
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Guangdong Open Laboratory of Veterinary Public Health; Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
| | - Zhen-Xing Liu
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention; Guangdong Open Laboratory of Veterinary Public Health; Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China.
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Li M, Cai RJ, Song S, Jiang ZY, Li Y, Gou HC, Chu PP, Li CL, Qiu HJ. Evaluation of immunogenicity and protective efficacy of recombinant outer membrane proteins of Haemophilus parasuis serovar 5 in a murine model. PLoS One 2017; 12:e0176537. [PMID: 28448603 PMCID: PMC5407842 DOI: 10.1371/journal.pone.0176537] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 04/12/2017] [Indexed: 12/04/2022] Open
Abstract
Glässer’s disease is an economically important infectious disease of pigs caused by Haemophilus parasuis. Few vaccines are currently available that could provide effective cross-protection against various serovars of H. parasuis. In this study, five OMPs (OppA, TolC, HxuC, LppC, and HAPS_0926) identified by bioinformatic approaches, were cloned and expressed as recombinant proteins. Antigenicity of the purified proteins was verified through Western blotting, and primary screening for protective potential was evaluated in vivo. Recombinant TolC (rTolC), rLppC, and rHAPS_0926 proteins showing marked protection of mice against H. parasuis infection, and were further evaluated individually or in combination. Mice treated with these three OMPs produced humoral and host cell-mediated responses, with a significant rise in antigen-specific IgG titer and lymphoproliferative response in contrast with the mock-immunized group. Significant increases were noted in CD4+, CD8+ T cells, and three cytokines (IL-2, IL-4, and IFN-γ) in vaccinated animals. The antisera against candidate antigens could efficiently impede bacterial survival in whole blood bactericidal assay against H. parasuis infection. The multi-protein vaccine induced more pronounced immune responses and offered better protection than individual vaccines. Our findings indicate that these three OMPs are promising antigens for the development of multi-component subunit vaccines against Glässer's disease.
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Affiliation(s)
- Miao Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China
| | - Ru-Jian Cai
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China
| | - Shuai Song
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China
| | - Zhi-Yong Jiang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China
| | - Yan Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China
| | - Hong-Chao Gou
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China
| | - Pin-Pin Chu
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China
| | - Chun-Ling Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Open Laboratory of Veterinary Public Health, Guangzhou, China
- Guangdong Provincial Key Laboratory of Livestock Disease Prevention, Guangzhou, China
- * E-mail: (CL); (HQ)
| | - Hua-Ji Qiu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
- * E-mail: (CL); (HQ)
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Guo L, Xu L, Wu T, Fu S, Qiu Y, Hu CAA, Ren X, Liu R, Ye M. Evaluation of recombinant protein superoxide dismutase of Haemophilus parasuis strain SH0165 as vaccine candidate in a mouse model. Can J Microbiol 2017; 63:312-320. [DOI: 10.1139/cjm-2016-0671] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Haemophilus parasuis can cause a severe membrane inflammation disorder. It has been documented that superoxide dismutase (SOD) is a potential target to treat systemic inflammatory diseases. Therefore, we constructed an experimental H. parasuis subunit vaccine SOD and determined the protective efficacy of SOD using a lethal dose challenge against H. parasuis serovar 4 strain MD0322 and serovar 5 strain SH0165 in a mouse model. The results demonstrated that SOD could induce a strong humoral immune response in mice and provide significant immunoprotection efficacy against a lethal dose of H. parasuis serovar 4 strain MD0322 or serovar 5 strain SH0165 challenge. IgG subtype analysis indicated SOD protein could trigger a bias toward a Th1-type immune response and induce the proliferation of splenocytes and secretion of IL-2 and IFN-γ of splenocytes. In addition, serum in mice from the SOD-immunized group could inhibit the growth of strain MD0322 and strain SH0165 in the whole-blood killing bacteria assay. This is the first report that immunization of mice with SOD protein could provide protective effect against a lethal dose of H. parasuis serovar 4 and serovar 5 challenge in mice, which may provide a novel approach against heterogeneous serovar infection of H. parasuis in future.
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Affiliation(s)
- Ling Guo
- Hubei Key Laboratory of Animal Nutrition and Feed Science, Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan Polytechnic University, Wuhan 430023, People’s Republic of China
| | - Lei Xu
- Hubei Key Laboratory of Animal Nutrition and Feed Science, Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan Polytechnic University, Wuhan 430023, People’s Republic of China
| | - Tao Wu
- Hubei Key Laboratory of Animal Nutrition and Feed Science, Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan Polytechnic University, Wuhan 430023, People’s Republic of China
| | - Shulin Fu
- Hubei Key Laboratory of Animal Nutrition and Feed Science, Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan Polytechnic University, Wuhan 430023, People’s Republic of China
| | - Yinsheng Qiu
- Hubei Key Laboratory of Animal Nutrition and Feed Science, Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan Polytechnic University, Wuhan 430023, People’s Republic of China
| | - Chien-An Andy Hu
- Hubei Key Laboratory of Animal Nutrition and Feed Science, Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan Polytechnic University, Wuhan 430023, People’s Republic of China
- Biochemistry and Molecular Biology, University of New Mexico School of Medicine, Albuquerque, NM 87131, USA
| | - Xinglong Ren
- College of Science, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China
| | - Rongrong Liu
- School of Animal Science and Nutritional Engineering, Wuhan Polytechnic University, Wuhan 430023, People’s Republic of China
| | - Mengdie Ye
- School of Animal Science and Nutritional Engineering, Wuhan Polytechnic University, Wuhan 430023, People’s Republic of China
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Immune response to oligopeptide permease A (OppA) protein in pigs naturally and experimentally infected with Haemophilus parasuis. Res Vet Sci 2016; 107:62-67. [PMID: 27473976 DOI: 10.1016/j.rvsc.2016.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 04/26/2016] [Accepted: 05/11/2016] [Indexed: 11/21/2022]
Abstract
Haemophilus parasuis is an important swine pathogen that causes Glasser's disease, characterized by pneumonia, polyserositis and meningitis. Protection against H. parasuis infection is associated with the presence of homologous antibodies in serum. However, a H. parasuis antigen that can elicit a protective immune response against all H. parasuis strains has yet to be found. A novel immunogenic and species-specific H. parasuis protein was identified by screening H. parasuis whole cell proteins using swine convalescent sera. One protein of 52kDa was clearly immunodominant and conserved among different H. parasuis strains. This protein was further identified as an oligopeptide permease A (OppA). Because OppA elicited a specific antibody response in pigs that recovered from H. parasuis infection, we investigated its potential role in diagnostics and protective immunity. An ELISA test using recombinant OppA (rOppA) as its coating antigen was further developed and tested. H. parasuis specific antibodies to rOppA were detected in serum from convalescent pigs but not in serum from specific pathogen free (SPF) or conventional pigs. Pigs immunized with rOppA protein had robust serological responses. However, the antibodies were not protective against challenge infection. We conclude that OppA is a universal species-specific H. parasuis immunogen, and a good marker for previous systemic infection with H. parasuis.
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