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Molecular study of an outer fragment of Haemophilus parasuis neuraminidase and utility with diagnostic and immunogen purposes. Res Vet Sci 2017; 115:463-469. [DOI: 10.1016/j.rvsc.2017.07.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 07/27/2017] [Accepted: 07/28/2017] [Indexed: 11/18/2022]
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Tang X, Wang H, Liu F, Sheng X, Xing J, Zhan W. Outer membrane protein A: An immunogenic protein induces highly protective efficacy against Vibrio ichthyoenteri. Microb Pathog 2017; 113:152-159. [PMID: 29074429 DOI: 10.1016/j.micpath.2017.10.043] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Revised: 09/21/2017] [Accepted: 10/20/2017] [Indexed: 11/30/2022]
Abstract
Vibrio ichthyoenteri was an important causative agent of bacterial enteritis in flounder (Paralichthys olivaceus). Outer membrane protein A (OmpA) of Gram-negative pathogen was a major cell surface antigen. In the present study, OmpA of V. ichthyoenteri was recombinantly expressed in Escherichia coli, and the immunogenicity of OmpA was identified by western blotting using flounder anti-rOmpA and anti-V. ichthyoenteri antibodies. The vaccine potential of rOmpA was tested in a flounder model, and a high relative percentage of survival rate was obtained with 73.1% after challenge with V. ichthyoenteri. Meanwhile, the immune response of flounder induced by rOmpA was also investigated, and the results showed that the sIg + lymphocytes in blood, spleen, and pronephros significantly proliferated, and the peak levels occurred at week 4 after immunization. Moreover, rOmpA could induce higher levels of specific serum antibodies than the control group after immunization, and the peak level occurred at week 5 after immunization. Meanwhile, qRT-PCR analysis showed that the expressions of CD4-1, CD8α, IL-1β, IFN-γ, MHCIα and MHCIIα genes were significantly up-regulated after immunization with rOmpA. Taking together, these results demonstrated that rOmpA could evoke highly protective effects against V. ichthyoenteri challenge and induce strong immune response of flounder, which indicated that OmpA was a promising vaccine candidate.
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Affiliation(s)
- Xiaoqian Tang
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, No.1 Wenhai Road, Qingdao 266071, China
| | - Hongye Wang
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Fuguo Liu
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Xiuzhen Sheng
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Jing Xing
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China
| | - Wenbin Zhan
- Laboratory of Pathology and Immunology of Aquatic Animals, KLMME, Ocean University of China, 5 Yushan Road, Qingdao 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, No.1 Wenhai Road, Qingdao 266071, China.
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Martínez-Martínez S, Frandoloso R, Rodríguez-Ferri EF, García-Iglesias MJ, Pérez-Martínez C, Álvarez-Estrada Á, Gutiérrez-Martín CB. A vaccine based on a mutant transferrin binding protein B of Haemophilus parasuis induces a strong T-helper 2 response and bacterial clearance after experimental infection. Vet Immunol Immunopathol 2016; 179:18-25. [PMID: 27590421 DOI: 10.1016/j.vetimm.2016.07.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 07/15/2016] [Accepted: 07/25/2016] [Indexed: 01/13/2023]
Abstract
This study aimed to characterize the type of immune response induced by an experimental vaccine based on a mutant Haemophilus parasuis transferrin binding protein (Tbp) B (Y167A) defective in its ability to bind porcine transferrin. Clinical and pathological signs, bacterial clearance, antibody response and the cytokine profile in alveolar macrophages and spleen after the vaccination and challenge of twenty-two colostrum-deprived pigs with 10(8) CFU of H. parasuis were analysed. Pigs vaccinated with Y167A were compared to those vaccinated with native TbpB (nTbpB), those treated with a commercial bacterin (CB) against Glässer's disease, those unvaccinated challenged (CH) and those unvaccinated unchallenged (UNCH) pigs. The rectal temperatures of Y167A pigs resembled those of UNCH pigs and were significantly lower than those of the nTbpB, CB and CH animals. A major reduction in pathological changes of the challenged pigs was observed in the Y167A group. H. parasuis was cleared from 88.9% of the samples from Y167A pigs versus 60.0% and 55.6% from those of the CB and nTbpB groups, respectively. The antibody response elicited by Y167A by ELISA was notably higher than that observed for nTbpB and CB pigs and was capable of preventing the expression and secretion of IL-8. The expression of IL-4 and IL-5, which were associated with the specific antibody levels, suggests that the main mechanism of protection conferred by Y167A vaccine is based on a strong T-helper 2 response.
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Affiliation(s)
- Sonia Martínez-Martínez
- Microbiology and Immunology Section, Department of Animal Health, Faculty of Veterinary Medicine, University of León, Spain
| | - Rafael Frandoloso
- Microbiology and Immunology Section, Department of Animal Health, Faculty of Veterinary Medicine, University of León, Spain; Laboratory of Microbiology and Advanced Immunology, Faculty of Agronomy and Veterinary Medicine, University of Passo Fundo, Brazil
| | - Elías-Fernando Rodríguez-Ferri
- Microbiology and Immunology Section, Department of Animal Health, Faculty of Veterinary Medicine, University of León, Spain
| | - María-José García-Iglesias
- Histology and Pathological Anatomy Section, Department of Animal Health, Faculty of Veterinary Medicine, University of León, Spain
| | - Claudia Pérez-Martínez
- Histology and Pathological Anatomy Section, Department of Animal Health, Faculty of Veterinary Medicine, University of León, Spain
| | - Álvaro Álvarez-Estrada
- Microbiology and Immunology Section, Department of Animal Health, Faculty of Veterinary Medicine, University of León, Spain
| | - César-Bernardo Gutiérrez-Martín
- Microbiology and Immunology Section, Department of Animal Health, Faculty of Veterinary Medicine, University of León, Spain.
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Li M, Li C, Song S, Kang H, Yang D, Li G. Development and antigenic characterization of three recombinant proteins with potential for Glässer's disease prevention. Vaccine 2016; 34:2251-8. [PMID: 26993332 DOI: 10.1016/j.vaccine.2016.03.014] [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: 07/15/2015] [Revised: 02/13/2016] [Accepted: 03/07/2016] [Indexed: 01/08/2023]
Abstract
Haemophilus parasuis is the causative agent of Glässer's disease, which causes high morbidity and mortality in piglets, leading to severe economic losses. The lack of a commercial vaccine against a broad spectrum of strains has limited the disease control. H. parasuis outer membrane proteins (OMPs) are potentially essential components for vaccine formulation. In this study, seven putative OMPs were selected from the annotated H. parasuis serovar 5 genome; they were predicted by bioinformatics and annotated as potential virulence-related factors. These proteins were cloned, expressed, and purified as His-tagged proteins. Antigenicity of the candidate proteins was assessed using Western blotting with convalescent sera against H. parasuis serovar 5. The immunogenicity of the seven OMPs was assessed in a guinea pig model. Except VacJ, all the other six recombinant proteins elicited a detectable antibody response. Antisera against four of the selected proteins effectively killed the bacteria in vitro. Three proteins (Omp26, VacJ, and HAPS_0742) were found to confer significant protection against challenge with a lethal dose of H. parasuis in a guinea pig model. The results suggest that these three proteins have a strong potential to be vaccine candidates against Glässer's disease.
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Affiliation(s)
- Miao Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, Guangdong, China; Public Laboratory of Veterinary Public Health of Guangdong Province, Guangzhou 510640, Guangdong, China; Guangdong Key Laboratory of Animal Epidemic Diseases Prevention, Guangzhou 510640, Guangdong, China; College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, Guangdong, China
| | - Chunling Li
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, Guangdong, China; Public Laboratory of Veterinary Public Health of Guangdong Province, Guangzhou 510640, Guangdong, China; Guangdong Key Laboratory of Animal Epidemic Diseases Prevention, Guangzhou 510640, Guangdong, China.
| | - Shuai Song
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, Guangdong, China; Public Laboratory of Veterinary Public Health of Guangdong Province, Guangzhou 510640, Guangdong, China; Guangdong Key Laboratory of Animal Epidemic Diseases Prevention, Guangzhou 510640, Guangdong, China
| | - Huahua Kang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, Guangdong, China; Public Laboratory of Veterinary Public Health of Guangdong Province, Guangzhou 510640, Guangdong, China; Guangdong Key Laboratory of Animal Epidemic Diseases Prevention, Guangzhou 510640, Guangdong, China
| | - Dongxia Yang
- Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, Guangdong, China; Public Laboratory of Veterinary Public Health of Guangdong Province, Guangzhou 510640, Guangdong, China; Guangdong Key Laboratory of Animal Epidemic Diseases Prevention, Guangzhou 510640, Guangdong, China
| | - Guoqing Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, Guangdong, China.
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Li M, Song S, Yang D, Li C, Li G. Identification of secreted proteins as novel antigenic vaccine candidates of Haemophilus parasuis serovar 5. Vaccine 2015; 33:1695-701. [DOI: 10.1016/j.vaccine.2015.02.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 02/04/2015] [Accepted: 02/09/2015] [Indexed: 10/24/2022]
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Costa-Hurtado M, Aragon V. Advances in the quest for virulence factors of Haemophilus parasuis. Vet J 2013; 198:571-6. [DOI: 10.1016/j.tvjl.2013.08.027] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 08/20/2013] [Accepted: 08/25/2013] [Indexed: 10/26/2022]
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Immunoproteomic analysis of the protective response obtained with subunit and commercial vaccines against Glässer's disease in pigs. Vet Immunol Immunopathol 2013; 151:235-47. [DOI: 10.1016/j.vetimm.2012.11.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 11/19/2012] [Accepted: 11/26/2012] [Indexed: 10/27/2022]
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8
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Frandoloso R, Martínez-Martínez S, Yubero S, Rodríguez-Ferri EF, Gutiérrez-Martín CB. New insights in cellular immune response in colostrum-deprived pigs after immunization with subunit and commercial vaccines against Glässer's disease. Cell Immunol 2012; 277:74-82. [PMID: 22721860 DOI: 10.1016/j.cellimm.2012.05.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Accepted: 05/15/2012] [Indexed: 12/28/2022]
Abstract
Four groups of colostrum-deprived pigs were immunized with Porcilis Glässer® (PG) or with subunit vaccines developed by us (rTbpA, NPAPT(M) or NPAPT(Cp)) against Glässer's disease, and they were challenged with 3×10(8)CFU of Haemophilus parasuis. A strong reduction in CD3(+)γδTCR(+) cells was seen in non-immunized control and scarcely protected (rTbpA) groups, suggesting that these cells could represent a target of H. parasuis infection. A significant increase in CD172α(+)CD163(+) cells was detected in all groups but PG, while a reduction in SLAIIDR(+) molecules expression was observed after challenge in control animals. Significant increases in CD3ε(+)CD8α(+)CD8β(+) and B cells were detected respectively in control and NPAPT groups, and in scarcely (rTbpA) and well-protected (NPAPT(M) and NPAPT(Cp)) groups. Finally, a greater response in CD4(+)CD8α(-) cells was observed in NPAPT(Cp) compared to NPAPT(M) and PG groups. These results state the potential of NPAPT antigen for developing effective vaccines against Glässer's disease.
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Affiliation(s)
- R Frandoloso
- Microbiology and Immunology Section, Department of Animal Health, University of León, 24007 León, Spain
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Assavacheep P, Assavacheep A, Turni C. Detection of a putative hemolysin operon, hhdBA, of Haemophilus parasuis from pigs with Glässer disease. J Vet Diagn Invest 2012; 24:339-43. [DOI: 10.1177/1040638711435805] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The aim of the current study was to investigate whether polymerase chain reaction amplification of 16S ribosomal (r)RNA and a putative hemolysin gene operon, hhdBA, can be used to monitor live pigs for the presence of Haemophilus parasuis and predict the virulence of the strains present. Nasal cavity swabs were taken from 30 live, healthy, 1- to 8-week-old pigs on a weekly cycle from a commercial Thai nursery pig herd. A total of 27 of these pigs (90%) tested positive for H. parasuis as early as week 1 of age. None of the H. parasuis–positive samples from healthy pigs was positive for the hhdBA genes. At the same pig nursery, swab samples from nasal cavity, tonsil, trachea, and lung, and exudate samples from pleural/peritoneal cavity were taken from 30 dead pigs displaying typical pathological lesions consistent with Glässer disease. Twenty-two of 140 samples (15.7%) taken from 30 diseased pigs yielded a positive result for H. parasuis. Samples from the exudate (27%) yielded the most positive results, followed by lung, tracheal swab, tonsil, and nasal swab, respectively. Out of 22 positive samples, 12 samples (54.5%) harbored hhdA and/or hhdB genes. Detection rates of hhdA were higher than hhdB. None of the H. parasuis–positive samples taken from nasal cavity of diseased pigs tested positive for hhdBA genes. More work is required to determine if the detection of hhdBA genes is useful for identifying the virulence potential of H. parasuis field isolates.
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Affiliation(s)
- Pornchalit Assavacheep
- Department of Veterinary Medicine, Faculty of Veterinary Science, Chulalongkorn University, Pathumwan, Bangkok, Thailand (P Assavacheep)
- Department of Animal Husbandry, Faculty of Veterinary Science, Chulalongkorn University, Pathumwan, Bangkok, Thailand (A Assavacheep)
- The University of Queensland, Queensland Alliance for Agriculture and Food Innovation, Dutton Park, Queensland, Australia (Turni)
| | - Anongnart Assavacheep
- Department of Veterinary Medicine, Faculty of Veterinary Science, Chulalongkorn University, Pathumwan, Bangkok, Thailand (P Assavacheep)
- Department of Animal Husbandry, Faculty of Veterinary Science, Chulalongkorn University, Pathumwan, Bangkok, Thailand (A Assavacheep)
- The University of Queensland, Queensland Alliance for Agriculture and Food Innovation, Dutton Park, Queensland, Australia (Turni)
| | - Conny Turni
- Department of Veterinary Medicine, Faculty of Veterinary Science, Chulalongkorn University, Pathumwan, Bangkok, Thailand (P Assavacheep)
- Department of Animal Husbandry, Faculty of Veterinary Science, Chulalongkorn University, Pathumwan, Bangkok, Thailand (A Assavacheep)
- The University of Queensland, Queensland Alliance for Agriculture and Food Innovation, Dutton Park, Queensland, Australia (Turni)
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Zhang B, Xu C, Zhou S, Feng S, Zhang L, He Y, Liao M. Comparative proteomic analysis of a Haemophilus parasuis SC096 mutant deficient in the outer membrane protein P5. Microb Pathog 2012; 52:117-24. [DOI: 10.1016/j.micpath.2011.11.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 11/14/2011] [Accepted: 11/21/2011] [Indexed: 11/25/2022]
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Maiti B, Shetty M, Shekar M, Karunasagar I, Karunasagar I. Recombinant outer membrane protein A (OmpA) of Edwardsiella tarda, a potential vaccine candidate for fish, common carp. Microbiol Res 2011; 167:1-7. [PMID: 21482086 DOI: 10.1016/j.micres.2011.02.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Revised: 01/19/2011] [Accepted: 02/14/2011] [Indexed: 10/18/2022]
Abstract
Outer membrane protein A (OmpA) is a component of the outer membrane of Edwardsiella tarda and is wildly distributed in Enterobacteriaceae family. The gene encoding the OmpA protein was cloned from E. tarda and expressed in Escherichia coli M15 cells. The recombinant OmpA protein containing His(6) residues was estimated to have a molecular weight of ~38kDa. In Western blot the native protein showed expression at ~36kDa molecular weight which was within the range of major outer membrane proteins (36-44kDa) observed in this study. All E. tarda isolates tested harbored the ompA gene and the antibody raised to this protein was seen to cross react with other Gram negative bacteria. The OmpA protein characterized in this study was observed to be highly immunogenic in both rabbit and fish. In Enzyme linked immunosorbent assay, rabbit antisera showed an antibody titer of 1: 128,000. Common carp vaccinated with recombinant OmpA protein elicited high antibody production and immunized fish showed a relative percentage survival of 54.3 on challenge.
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Affiliation(s)
- Biswajit Maiti
- UNESCO-MIRCEN for Marine Biotechnology, Department of Fishery Microbiology, Karnataka Veterinary, Animal & Fisheries Sciences University, College of Fisheries, Mangalore, India
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Immunogenicity and protection against Haemophilus parasuis infection after vaccination with recombinant virulence associated trimeric autotransporters (VtaA). Vaccine 2011; 29:2797-802. [DOI: 10.1016/j.vaccine.2011.01.105] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Revised: 01/21/2011] [Accepted: 01/30/2011] [Indexed: 11/22/2022]
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Development and characterization of protective Haemophilus parasuis subunit vaccines based on native proteins with affinity to porcine transferrin and comparison with other subunit and commercial vaccines. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2010; 18:50-8. [PMID: 20926701 DOI: 10.1128/cvi.00314-10] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Haemophilus parasuis is the agent responsible for causing Glässer's disease, which is characterized by fibrinous polyserositis, polyarthritis, and meningitis in pigs. In this study, we have characterized native outer membrane proteins with affinity to porcine transferrin (NPAPT) from H. parasuis serovar 5, Nagasaki strain. This pool of proteins was used as antigen to developed two vaccine formulations: one was adjuvanted with a mineral oil (Montanide IMS 2215 VG PR), while the other was potentiated with a bacterial neuraminidase from Clostridium perfringens. The potential protective effect conferred by these two vaccines was compared to that afforded by two other vaccines, consisting of recombinant transferrin-binding protein (rTbp) A or B fragments from H. parasuis, Nagasaki strain, and by a commercially available inactivated vaccine. Five groups of colostrum-deprived piglets immunized with the vaccines described above, one group per each vaccine, and a group of nonvaccinated control animals were challenged intratracheally with a lethal dose (3 × 10⁸ CFU) of H. parasuis, Nagasaki strain. The two vaccines containing rTbps yielded similar results with minimal protection against death, clinical signs, gross and microscopic lesions, and H. parasuis invasion. In contrast, the two vaccines composed of NPAPT antigen and commercial bacterin resulted in a strong protection against challenge (without deaths and clinical signs), mild histopathological changes, and no recovery of H. parasuis, thus suggesting their effectiveness in preventing Glässer's disease outbreaks caused by serovar 5.
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Chang H, Cheng A, Wang M, Zhu D, Jia R, Liu F, Chen Z, Luo Q, Chen X, Zhou Y. Cloning, expression and characterization of gE protein of duck plague virus. Virol J 2010; 7:120. [PMID: 20529349 PMCID: PMC2897786 DOI: 10.1186/1743-422x-7-120] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Accepted: 06/08/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The gE protein of duck plague virus is the important membrane glycoprotein, its protein characterization has not been reported. In this study, we expressed and presented the characterization of the DPV gE product. RESULTS According to the sequence of the gE gene, a pair of primers were designed, and the DNA product with 1490bp in size was amplified by using the polymerase chain reaction (PCR). The PCR product was cloned into pMD18-T vector, and subcloned into pET32a(+), generating the recombinant plasmid pET32a/DPV-gE. SDS-PAGE analysis showed that the fusion pET32a/DPV-gE protein was highly expressed after induction by 0.2 mM IPTG at 30 degrees C for 4.5 h in Rosseta host cells. Over expressed 6xHis-gE fusion protein was purified by nickel affinity chromatography, and used to immunize the rabbits for the preparation of polyclonal antibody. The result of the intracellular localization revealed that the gE protein was appeared to be in the cytoplasm region. The real time PCR, RT-PCR analysis and Western blotting revealed that the gE gene was produced most abundantly during the late phase of replication in DPV-infected cells. CONCLUSIONS In this work, the DPV gE protein was successfully expressed in a prokaryotic expression system, and we presented the basic properties of the DPV gE product for the first time. These properties of the gE protein provided a prerequisite for further functional analysis of this gene.
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Affiliation(s)
- Hua Chang
- Avian Diseases Research Center, College of Veterinary Medicine of Sichuan Agricultural University, Yaan, Sichuan, China
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Martínez S, Frandoloso R, Rodríguez-Ferri EF, González-Zorn B, Gutiérrez-Martín CB. Characterization of a recombinant transferrin-binding protein A (TbpA) fragment from Haemophilus parasuis serovar 5. FEMS Microbiol Lett 2010; 307:142-50. [DOI: 10.1111/j.1574-6968.2010.01970.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Olvera A, Pina S, Pérez-Simó M, Oliveira S, Bensaid A. Virulence-associated trimeric autotransporters of Haemophilus parasuis are antigenic proteins expressed in vivo. Vet Res 2009; 41:26. [PMID: 19995512 PMCID: PMC2820231 DOI: 10.1051/vetres/2009074] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2009] [Accepted: 12/07/2009] [Indexed: 11/19/2022] Open
Abstract
Glässer’s disease is a re-emerging swine disease characterized by a severe septicaemia. Vaccination has been widely used to control the disease, although there is a lack of extended cross-protection. Trimeric autotransporters, a family of surface exposed proteins implicated in host-pathogen interactions, are good vaccine candidates. Members of this family have been described in Haemophilus parasuis and designated as virulence-associated trimeric autotransporters (VtaA). In this work, we produced 15 recombinant VtaA passenger domains and looked for the presence of antibodies directed against them in immune sera by immunoblotting. After infection with a subclinical dose of H. parasuis Nagasaki, an IgG mediated antibody response against 6 (VtaA1, 5, 6, 8, 9 and 10) of the 13 VtaA of the Nagasaki strain was detected, indicating that they are expressed in vivo. IgA production against VtaA was detected in only one animal. VtaA were more likely to be late antigens when compared to early (Omp P5 and Omp P6) and late (YaeT) defined antigens. Antibody cross-reaction with two orthologs of Nagasaki’s VtaA5 and 6, VtaA15 and 16 of strain HP1319, was also detected. No antibodies against VtaA were detected in the sera of animals immunized with a bacterin of the Nagasaki strain, suggesting poor expression in the in vitro conditions used. Taken together, these results indicate that VtaA are good candidate immunogens that could be used to improve H. parasuis vaccines. However, their capacity to confer protective immunity needs to be further studied.
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Affiliation(s)
- Alex Olvera
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona-Edifici CReSA, 08193 Bellaterra, Barcelona, Spain.
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Characterization and comparative analysis of the genes encoding Haemophilus parasuis outer membrane proteins P2 and P5. J Bacteriol 2009; 191:5988-6002. [PMID: 19633080 DOI: 10.1128/jb.00469-09] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Haemophilus parasuis is a swine pathogen of significant industry concern, but little is known about how the organism causes disease. A related human pathogen, Haemophilus influenzae, has been better studied, and many of its virulence factors have been identified. Two of these, outer membrane proteins P2 and P5, are known to have important virulence properties. The goals of this study were to identify, analyze, and compare the genetic relatedness of orthologous genes encoding P2 and P5 proteins in a diverse group of 35 H. parasuis strains. Genes encoding P2 and P5 proteins were detected in all H. parasuis strains evaluated. The predicted amino acid sequences for both P2 and P5 proteins exhibit considerable heterogeneity, particularly in regions corresponding to predicted extracellular loops. Twenty-five variants of P2 and 17 variants of P5 were identified. The P2 proteins of seven strains were predicted to contain a highly conserved additional extracellular loop compared to the remaining strains and to H. influenzae P2. Antigenic-site predictions coincided with predicted extracellular loop regions of both P2 and P5. Neighbor-joining trees constructed using P2 and P5 sequences predicted divergent evolutionary histories distinct from those predicted by a multilocus sequence typing phylogeny based on partial sequencing of seven housekeeping genes. Real-time reverse transcription-PCR indicated that both genes are expressed in all of the strains.
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