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Guo X, Sun M, Guo Y, Wu Y, Yan X, Liu M, Li J, Sun X, Fan X, Zhang H, Sun S, Wang J, Yin D. Production and evaluation of anti-BP26 monoclonal antibodies for the serological detection of animal brucellosis. Front Vet Sci 2024; 11:1389728. [PMID: 38957801 PMCID: PMC11217538 DOI: 10.3389/fvets.2024.1389728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Accepted: 05/31/2024] [Indexed: 07/04/2024] Open
Abstract
Brucella BP26 proves to be a highly immunogenic antigen with excellent specificity in brucellosis detection. In China, the authorized use of the Bp26-deleted vaccine M5ΔBP26 for preventing small ruminant brucellosis highlights the importance of developing accurate detection methods targeting BP26, particularly for the diagnosis of differentiation between infected and vaccinated animals (DIVA). Using the traditional mouse hybridoma technique, we successfully obtained 12 monoclonal antibodies (mAbs) targeting BP26. The efficacy of these mAbs in detecting various animal brucellosis cases using the competitive ELISA method was evaluated. Among them, only the E10 mAb exhibited significant efficiency, being inhibited by 100, 97.62, and 100% of brucellosis-positive sera from cattle, small ruminants, and canines, respectively. The E10-based competitive enzyme-linked immunosorbent assay (cELISA) outperformed the BP26-based indirect enzyme-linked immunosorbent assay (iELISA) in accuracy, particularly for cattle and small ruminant brucellosis, with cELISA sensitivity reaching 97.62% compared to 64.29% for iELISA for small ruminants. Although cELISA showed slightly lower specificity than iELISA, it still maintained high accuracy in canine brucellosis detection. The epitope of mAb E10 was identified in the amino acid sequence QPIYVYPDDKNNLKEPTITGY, suggesting its potential as a diagnostic antigen for brucellosis. In conclusion, the E10-based cELISA presents an effective means of detecting animal brucellosis, particularly significant for DIVA diagnosis in China, where the BP26-mutant vaccine is widely used.
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Affiliation(s)
- Xiaohan Guo
- Key Laboratory of Human Genetics and Environmental Medicine, School of Public Health, Xuzhou Medical University, Xuzhou, China
| | - Mingjun Sun
- Laboratory of Zoonoses, China Animal Health and Epidemiology Center, Qingdao, China
| | - Yu Guo
- Testing Laboratory, Inner Mongolia Animal Disease Control Center, Hohhot, China
| | - Yao Wu
- College of Animal Science and Technology, Shandong Agriculture University, Taian, China
| | - Xin Yan
- Laboratory of Zoonoses, China Animal Health and Epidemiology Center, Qingdao, China
| | - Mengda Liu
- Laboratory of Zoonoses, China Animal Health and Epidemiology Center, Qingdao, China
| | - Jiaqi Li
- Laboratory of Zoonoses, China Animal Health and Epidemiology Center, Qingdao, China
| | - Xiangxiang Sun
- Laboratory of Zoonoses, China Animal Health and Epidemiology Center, Qingdao, China
| | - Xiaoxu Fan
- Laboratory of Zoonoses, China Animal Health and Epidemiology Center, Qingdao, China
| | - Haobo Zhang
- Laboratory of Zoonoses, China Animal Health and Epidemiology Center, Qingdao, China
| | - Shufang Sun
- Laboratory of Zoonoses, China Animal Health and Epidemiology Center, Qingdao, China
| | - Jianlong Wang
- Testing Laboratory, Inner Mongolia Animal Disease Control Center, Hohhot, China
| | - Dehui Yin
- Key Laboratory of Human Genetics and Environmental Medicine, School of Public Health, Xuzhou Medical University, Xuzhou, China
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2
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Kong Y, Wang H, Wu S, Lv J, Mei L, Zhou H, Lin X, Han X. A quantum dot fluorescent microsphere based immunochromatographic strip for detection of brucellosis. BMC Vet Res 2021; 17:48. [PMID: 33485335 PMCID: PMC7823175 DOI: 10.1186/s12917-021-02760-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 01/12/2021] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Brucellosis is a serious zoonosis disease that frequently causes significant economic loss in animal husbandry and threatens human health. Therefore, we established a rapid, accurate, simple and sensitive fluorescent immunochromatographic strip test (ICST) based on quantum dots (QDs) for detection the antibodies of Brucella infection animals serum. RESULTS The test strips were successfully prepared by quantum dot fluorescent microspheres (QDFM) as tracers, which were covalently coupled to an outer membrane protein of Brucella OMP22. The outer membrane protein OMP28 and monoclonal antibodies of OMP22 were separately dispensed onto a nitrocellulose membrane as test and quality control lines, respectively. The critical threshold for determining negative or positive through the ratio of the fluorescent signal of the test line and the control line (HT / HC) is 0.0492. The repeatability was excellent with an overall average CV of 8.78%. Under optimum conditions, the limit of detection was 1.05 ng/mL (1:512 dilution). With regard to the detection of brucellosis in 150 clinical samples, the total coincidence rate of ICST and Rose Bengal plate test (RBPT) was 97.3%, the coincidence rate of positive samples was 98.8%, the coincidence rate of negative samples was 95.3%, the sensitivity of RBPT is 1:32, and no cross reaction with the sera of other related diseases was observed. CONCLUSION In our present study, the QDFM has promising application for on-site screening of brucellosis owing to its high detection speed, high sensitivity, high specificity and low cost.
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Affiliation(s)
- Yufang Kong
- Institute of Animal Inspection and Quarantine, Chinese Academy of Inspection and Quarantine, 100176, Beijing, China
| | - Huiyu Wang
- Institute of Animal Inspection and Quarantine, Chinese Academy of Inspection and Quarantine, 100176, Beijing, China
| | - Shaoqiang Wu
- Institute of Animal Inspection and Quarantine, Chinese Academy of Inspection and Quarantine, 100176, Beijing, China
| | - Jizhou Lv
- Institute of Animal Inspection and Quarantine, Chinese Academy of Inspection and Quarantine, 100176, Beijing, China
| | - Lin Mei
- Institute of Animal Inspection and Quarantine, Chinese Academy of Inspection and Quarantine, 100176, Beijing, China
| | - Huifang Zhou
- People's Hospital of Jiaxiang, Jiaxiang County, Jining City, 272400, Shandong Province, China
| | - Xiangmei Lin
- Institute of Animal Inspection and Quarantine, Chinese Academy of Inspection and Quarantine, 100176, Beijing, China.
| | - Xueqing Han
- Institute of Animal Inspection and Quarantine, Chinese Academy of Inspection and Quarantine, 100176, Beijing, China.
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3
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Recombinant Omp2b antigen-based ELISA is an efficient tool for specific serodiagnosis of animal brucellosis. Braz J Microbiol 2019; 50:979-984. [PMID: 31352634 DOI: 10.1007/s42770-019-00097-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Accepted: 05/22/2019] [Indexed: 01/18/2023] Open
Abstract
Control of brucellosis as a worldwide zoonotic disease is based on vaccination of animals and diagnosis of infected cases to be eradicated. Accurate and rapid detection of infected animals is of critical importance for preventing the spread of disease. Current detection of brucellosis is based on whole-cell antigens and investigating serum antibodies against Brucella lipopolysaccharide (LPS). The critical disadvantage is misdiagnosis of vaccinated animals as infected ones and also cross-reactions with other Gram-negative bacteria. Recombinant outer membrane protein 2b (Omp2b) of Brucella abortus was evaluated as a novel serodiagnostic target in comparison to conventional tests which are based on LPS. Recombinant Omp2b (rOmp2b) was expressed in Escherichia coli BL21 and purified by Ni2+-based chromatography. rOmp2b was evaluated in an indirect enzyme-linked immunosorbent assay (ELISA) system for diagnosis of brucellosis, with sera from Brucella-infected mice along with negative sera and sera from mice which were inoculated with other Gram-negative species for assurance of specificity. Thereafter, cattle sera collected from different regions were assessed along with known negative and known positive serum samples. We found that Omp2b can discriminate between Brucella-infected animals and non-infected ones. Results for assessment of two hundred and fifty cattle sera by Omp2b-based indirect ELISA which were compared to Rose Bengal plate agglutination test (RBPT) and serum tube agglutination test (SAT) showed that our proposed procedure has the sensitivity of 88.5%, specificity of 100%, and accuracy of 90.8%. We suggest that recombinant Omp2b could be used as a protein antigen for diagnosis of brucellosis in domestic animals and can be evaluated for detection of human brucellosis.
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4
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Yilmaz H, Faburay B, Turan N, Cotton-Caballero M, Cetinkaya B, Gurel A, Yilmaz A, Cizmecigil UY, Aydin O, Tarakci EA, Bayraktar E, Richt JA. Production of Recombinant N Protein of Infectious Bronchitis Virus Using the Baculovirus Expression System and Its Assessment as a Diagnostic Antigen. Appl Biochem Biotechnol 2019; 187:506-517. [PMID: 29987628 PMCID: PMC7090399 DOI: 10.1007/s12010-018-2815-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 06/05/2018] [Indexed: 11/26/2022]
Abstract
The avian coronavirus-infectious bronchitis virus (AvCoV-IBV) is recognized as an important avian pathogen, and new viral variants are a continuous threat to the poultry industry worldwide. Sensitive diagnostics and efficacious vaccines are necessary to combat IBV infections in chickens. The aim of this study was to produce recombinant N protein of IBV in the baculovirus system to use in ELISA diagnostic tests in order to enable the assessment of the sero-prevalence and risk of IBV infections in chickens in Turkey. For this, the gene encoding the N protein of the Beaudette strain of IBV was expressed using a recombinant baculovirus expression system. The recombinant N protein was purified using Ni-NTA affinity chromatography. An estimated 50-kDa recombinant protein corresponding to the expected molecular weight of IBV N including the 6xHis tag was detected using an anti-His monoclonal antibody. Specific immunoreactivity of the recombinant protein was confirmed by Western blot using antiserum obtained from vaccinated and naturally infected chicken from Turkey as well as using a monoclonal antibody raised against the N protein of the IBV Massachusetts strain. The results obtained with the in-house ELISA had high agreement with a commercial ELISA. Immunoreactivity analysis using antisera in Western blotting and the in-house ELISA suggests that the recombinant IBV N protein could be broadly cross-reactive with antisera produced against different IBV strains. We conclude that the recombinant baculovirus expressed IBV N protein could serve as a useful diagnostic antigen for detection of IBV infections in chickens by ELISA.
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Affiliation(s)
- Huseyin Yilmaz
- Department of Virology, University of Istanbul, Veterinary Faculty, 34320, Istanbul, Turkey
| | - Bonto Faburay
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State, University, Manhattan, KS USA
| | - Nuri Turan
- Department of Virology, University of Istanbul, Veterinary Faculty, 34320, Istanbul, Turkey
| | - Maira Cotton-Caballero
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State, University, Manhattan, KS USA
| | - Burhan Cetinkaya
- Department of Microbiology, Veterinary Faculty, University of Firat, Elazig, Turkey
| | - Aydin Gurel
- Department of Pathology, Veterinary Faculty, University of Istanbul, Avcilar, Istanbul, Turkey
| | - Aysun Yilmaz
- Department of Virology, University of Istanbul, Veterinary Faculty, 34320, Istanbul, Turkey
| | - Utku Y. Cizmecigil
- Department of Virology, University of Istanbul, Veterinary Faculty, 34320, Istanbul, Turkey
| | - Ozge Aydin
- Department of Virology, University of Istanbul, Veterinary Faculty, 34320, Istanbul, Turkey
| | - Eda Altan Tarakci
- Department of Virology, University of Istanbul, Veterinary Faculty, 34320, Istanbul, Turkey
| | | | - Juergen A. Richt
- Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State, University, Manhattan, KS USA
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5
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Diagnostic potential of Brucella melitensis Rev1 native Omp28 precursor in human brucellosis. Cent Eur J Immunol 2018; 43:81-89. [PMID: 29736150 PMCID: PMC5927177 DOI: 10.5114/ceji.2018.74877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 03/10/2017] [Indexed: 01/18/2023] Open
Abstract
Serologic tests for brucellosis aim to detect antibodies produced against membranous lipopolysaccharide of bacteria. Diagnostic use of this method is limited due to false positiveness. This study evaluates an alternative antigen to lipopolysaccharides (LPS), outer membrane 28-precursor-protein, of Brucella melitensis Rev1 for its diagnostic value. Omp28 precursor of B. melitensis Rev1 was cloned, expressed, and purified. 6-His and sumo epitope tags were used to tag the protein at N-termini. Omp28 gene was amplified based on the ORF sequence and cloned into a pETSUMO vector. The recombinant construct was propagated in Escherichia coli One Shot® Mach1™ cells then transformed into E. coli BL21(D3) cells for protein expression. The purified protein was studied in an indirect ELISA for diagnosis of brucellosis. Sera samples from 60 patients were screened by ELISA and the results were compared to Rose Bengal plate test. Recombinant antigen-based iELISA has given a successful outcome with the sensitivity, specificity, positive predictive value, and negative predictive value of 87.8%, 96.2%, 96.6%, and 78.78%, respectively. In conclusion, recombinant production and purification of the immunodominant Omp28 precursor protein has been achieved successfully in a one-step process with efficient yield and can be used for diagnosis of brucellosis in humans.
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6
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Wu N, Li N, Hu L, He J, Li J, Zhao F, Wu Y. Immunogenicity and immunoreactivity of Tp0821 recombinant protein from Treponema pallidum. Mol Med Rep 2017; 16:851-856. [PMID: 28586013 DOI: 10.3892/mmr.2017.6675] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Accepted: 02/13/2017] [Indexed: 11/05/2022] Open
Abstract
Treponema pallidum (Tp) is responsible for invading reproductive organs and the skin in early stages, and involves almost all organs/systems at advanced stages. In the present study, screening of the dominant epitope fragment of the Tp outer membrane protein, Tp0821, was performed and the prokaryotic expression vector pQE32/Tp0821 was constructed. The denaturation and dialysis of rTp0821 were achieved through ultrasound, inclusion body washing and dissolution. Experiments in purified rTp0821‑immune New Zealand rabbits indicated that the recombinant proteins were of high immunogenicity, and the irritation led a marked humoral immune response in the New Zealand rabbits. Western blot analysis showed that the purified recombinant proteins reacted with the Tp‑positive infected serum, confirming the high level of immunoreactivity. The delayed type hypersensitivity of rTp0821 recombinant proteins was positive, indicating that rTp0821 induced a specific cell immune response and was selected as a Tp vaccine candidate protein. The findings of the present study provided novel evidence, which provided information for further investigations on the pathogenic mechanism of Tp and the development of diagnostic reagents.
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Affiliation(s)
- Ning Wu
- Department of Clinical Laboratory, The First People's Hospital of Hengyang, Hengyang, Hunan 421001, P.R. China
| | - Ni Li
- Emergency Department, Second Affiliated Hospital, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Liping Hu
- Department of Clinical Laboratory, The First People's Hospital of Hengyang, Hengyang, Hunan 421001, P.R. China
| | - Jun He
- Department of Clinical Laboratory, Nanhua Affiliated Hospital, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Junhong Li
- Changzhou Center for Disease Control and Prevention, Changzhou, Jiangsu 213022, P.R. China
| | - Feijun Zhao
- Pathogenic Biology Institute, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Yimou Wu
- Pathogenic Biology Institute, University of South China, Hengyang, Hunan 421001, P.R. China
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7
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Li T, Tong Z, Huang M, Tang L, Zhang H, Chen C. Brucella melitensis M5-90Δbp26 as a potential live vaccine that allows for the distinction between natural infection and immunization. Can J Microbiol 2017; 63:719-729. [PMID: 28482164 DOI: 10.1139/cjm-2017-0179] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Brucella is Gram-negative intracellular bacterial pathogen that infects humans and animals and contributes to great economic losses in developing countries. Presently, live attenuated Brucella vaccines (Brucella melitensis M5-90) are the most effective means of brucellosis control and prevention in animals. However, these vaccines have several drawbacks, such as an inability to distinguish between a natural infection and immunization and an association with abortions in pregnant animals. Therefore, this study constructed a Brucella M5-90Δbp26 mutant and evaluated its virulence. The survival of the M5-90Δbp26 mutant was attenuated in human placenta trophoblastic 8 cells (HPT-8 cells) and in BALB/c mice, with a high immunoprotectivity noted in mice. Furthermore, safety tests showed that the M5-90Δbp26 mutant was less virulent than the M5-90 vaccine strain. Additionally, an indirect enzyme-linked immunosorbent assay (ELISA) screening was shown to detect the presence of Brucella protein 26 (BP26) with high sensitivity, with M5-90Δbp26 inoculation accompanied with a lack of BP26 expression, and was further confirmed by western blotting. Together, the M5-90Δbp26 mutant and the indirect ELISA can be employed to distinguish vaccinated livestock from infected animals.
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Affiliation(s)
- Tiansen Li
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Zhixia Tong
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Meiling Huang
- b College of Life Science, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Liyan Tang
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Hui Zhang
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
| | - Chuangfu Chen
- a College of Animal Science and Technology, Shihezi University, 832000, Shihezi, Xinjiang, People's Republic of China
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8
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Li ZQ, Gui D, Sun ZH, Zhang JB, Zhang WZ, Zhang H, Guo F, Chen CF. Immunization of BALB/c mice with Brucella abortus 2308ΔwbkA confers protection against wild-type infection. J Vet Sci 2016; 16:467-73. [PMID: 26040616 PMCID: PMC4701739 DOI: 10.4142/jvs.2015.16.4.467] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 03/26/2015] [Accepted: 04/04/2015] [Indexed: 12/16/2022] Open
Abstract
Brucellosis is a zoonotic disease that causes animal and human diseases. Vaccination is a major measure for prevention of brucellosis, but it is currently not possible to distinguish vaccinated animals from those that have been naturally infected. Therefore, in this study, we constructed the Brucella (B.) abortus 2380 wbkA mutant (2308ΔwbkA) and evaluated its virulence. The survival of 2308ΔwbkA was attenuated in murine macrophage (RAW 264.7) and BALB/c mice, and it induced high protective immunity in mice. The wbkA mutant elicited an anti-Brucella-specific immunoglobulin G response and induced the secretion of gamma interferon. Antibodies to 2308ΔwbkA could be detected in sera from mice, implying the potential for use of this protein as a diagnostic antigen. The WbkA antigen would allow serological differentiation between infected and vaccinated animals. These results suggest that 2308ΔwbkA is a potential attenuated vaccine against 16M. This vaccine will be further evaluated in sheep.
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Affiliation(s)
- Zhi-qiang Li
- College of Animal Science and Technology, Shihezi University, Shihezi 832000, China.,School of life sciences, Shangqiu normal university, Shangqiu 476000, China
| | - Dan Gui
- College of Animal Science and Technology, Shihezi University, Shihezi 832000, China
| | - Zhi-hua Sun
- College of Animal Science and Technology, Shihezi University, Shihezi 832000, China
| | - Jun-bo Zhang
- College of Biology, Agriculture and Forestry, Tongren University, Tongren 554300, China
| | - Wen-zhi Zhang
- College of Animal Science and Technology, Shihezi University, Shihezi 832000, China
| | - Hui Zhang
- College of Animal Science and Technology, Shihezi University, Shihezi 832000, China.,College of Co-Innovation Center for Zoonotic Infectious Diseases in the Western Region, Shihezi University, Shihezi 832000, China
| | - Fei Guo
- College of Biology, Agriculture and Forestry, Tongren University, Tongren 554300, China.,College of Medicine, Shihezi University, Shihezi 832000, China
| | - Chuang-fu Chen
- College of Animal Science and Technology, Shihezi University, Shihezi 832000, China.,College of Co-Innovation Center for Zoonotic Infectious Diseases in the Western Region, Shihezi University, Shihezi 832000, China
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9
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Manat Y, Shustov AV, Evtehova E, Eskendirova SZ. Expression, purification and immunochemical characterization of recombinant OMP28 protein of Brucella species. Open Vet J 2016; 6:71-7. [PMID: 27303654 PMCID: PMC4886644 DOI: 10.4314/ovj.v6i2.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 04/18/2016] [Indexed: 11/18/2022] Open
Abstract
Brucellosis is the lion’s share of infectious disease of animals and it has a particular socio-economic importance for the Republic of Kazakhstan. Sixty percent of epizootic outbreaks of brucellosis identified in the Commonwealth of Independent States (CIS) originated from Kazakhstan in recent years. Definitive diagnosis of brucellosis remains a difficult task. Precisely for this reason, we evaluated a purified recombinant out membrane protein 28 (rOMP28) of Brucella species (Brucella spp.) produced in Escherichia coli (E. coli) as a diagnostic antigen in an Indirect ELISA (I-ELISA) for bovine brucellosis. The gene encoding OMP28 was synthesized using a two-round PCR procedure. In order to produce the rOMP28, the de novo synthesized DNA was cloned into the expression vector pET-22b(+). Then, the rOMP28 was expressed in E. coli system and characterized in the present study. We further estimated the diagnostic potential of purified rOMP28 of Brucella spp. for screening bovine sera. To determine if rOMP28 has a valuable benefit for use in the serodiagnosis of bovine brucellosis, rOMP28-based I-ELISA was performed. Brucella spp. positive (n=62) and Brucella spp. negative (n=28) samples from tube agglutination test (TAT) were positive (n=59) and negative (n=27) by I-ELISA, respectively. These findings show that the rOMP28 of Brucella spp. could be a good candidate for improving serological diagnostic methods for bovine brucellosis.
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Affiliation(s)
- Y Manat
- Laboratory of Cell Biotechnology, National Centre for Biotechnology, Astana, 010000, Republic of Kazakhstan
| | - A V Shustov
- Laboratory of Genetic Engineering, National Centre for Biotechnology, Astana, 010000, Republic of Kazakhstan
| | - E Evtehova
- Laboratory of Cell Biotechnology, National Centre for Biotechnology, Astana, 010000, Republic of Kazakhstan
| | - S Z Eskendirova
- Laboratory of Cell Biotechnology, National Centre for Biotechnology, Astana, 010000, Republic of Kazakhstan
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10
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Ahmed IM, Khairani-Bejo S, Hassan L, Bahaman AR, Omar AR. Serological diagnostic potential of recombinant outer membrane proteins (rOMPs) from Brucella melitensis in mouse model using indirect enzyme-linked immunosorbent assay. BMC Vet Res 2015; 11:275. [PMID: 26530141 PMCID: PMC4630882 DOI: 10.1186/s12917-015-0587-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 10/16/2015] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Brucella melitensis is the most important pathogenic species of Brucella spp. which affects goats and sheep and causes caprine and ovine brucellosis, respectively. Serological tests for diagnosis of brucellosis such as Rose Bengal plate test (RBPT) and enzyme-linked immunosorbent assay (ELISA) usually utilize smooth lipopolysaccharides (S-LPS) as a diagnostic antigen which could give false positive serological reactions. Outer membrane proteins (OMP) of B. melitensis have been used as alternative diagnostic antigens rather than S-LPS for differential serological diagnosis of brucellosis, mainly in ELISA with single recombinant OMP (rOMP) as a diagnostic antigen. Nevertheless, the use of single format mainly showed lack of sensitivity against the desired rOMP. Therefore, this study aimed to determine whether a newly developed rOMPs indirect ELISA (rOMPs I-ELISA), based on combination of rOMP25, rOMP28 and rOMP31of B. melitensis, has a potential benefit for use in the serodiagnosis of brucellosis. METHODS In this study, omp25, omp28 and omp31 of B. melitensis were cloned and expressed using prokaryotic pET-32 Ek/LIC system and their respective rOMPs were combined as one coating antigen to develop rOMPs I-ELISA. Three groups of BALB/c mice were used to elicit antibody response. Group 1, infected with B. melitensis strain 0331 field strain; group 2, injected with B. melitensis Rev.1 vaccine strain and group 3, infected with Yersinia enterocolitica O:9. Antibody responses in three groups of mice were investigated using Rose Bengal plate test (RBPT) and rOMPs I-ELISA. RESULTS The production of rOMP25, rOMP28 and rOMP31 of B. melitensis were achieved and Western immunoblotting analysis demonstrated their reactivity. The RBPT was unable to differentiate the vaccinated mice (group 2) and mice infected with Y. enterocolitica O:9 (group 3) and categorized them wrongly as positive for brucellosis. In contrast, the rOMPs I-ELISA was able to differentiate the mice infected with B. melitensis strain 0331 (group 1) from both of group 2 and group 3, and recorded 100% sensitivity and 100% specificity. CONCLUSIONS The results of this study suggested that rOMPs of B. melitensis has potential diagnostic ability to differentiate the FPSR in serological diagnosis of brucellosis.
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Affiliation(s)
- Ihsan Muneer Ahmed
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.
- Department of Microbiology, College of Veterinary Medicine, University of Mosul, Mosul, Iraq.
| | - Siti Khairani-Bejo
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.
| | - Latiffah Hassan
- Department of Veterinary Laboratory Diagnostics, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.
| | - Abdul Rani Bahaman
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.
| | - Abdul Rahman Omar
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.
- Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.
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11
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Qiu J, Wang W, Wu J, Zhang H, Wang Y, Qiao J, Chen C, Gao GF, Allain JP, Li C. Characterization of periplasmic protein BP26 epitopes of Brucella melitensis reacting with murine monoclonal and sheep antibodies. PLoS One 2012; 7:e34246. [PMID: 22457830 PMCID: PMC3311636 DOI: 10.1371/journal.pone.0034246] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 02/24/2012] [Indexed: 11/22/2022] Open
Abstract
More than 35,000 new cases of human brucellosis were reported in 2010 by the Chinese Center for Disease Control and Prevention. An attenuated B. melitensis vaccine M5-90 is currently used for vaccination of sheep and goats in China. In the study, a periplasmic protein BP26 from M5-90 was characterized for its epitope reactivity with mouse monoclonal and sheep antibodies. A total of 29 monoclonal antibodies (mAbs) against recombinant BP26 (rBP26) were produced, which were tested for reactivity with a panel of BP26 peptides, three truncated rBP26 and native BP26 containing membrane protein extracts (NMP) of B. melitensis M5-90 in ELISA and Western-Blot. The linear, semi-conformational and conformational epitopes from native BP26 were identified. Two linear epitopes recognized by mAbs were revealed by 28 of 16mer overlapping peptides, which were accurately mapped as the core motif of amino acid residues 93DRDLQTGGI101 (position 93 to 101) or residues 104QPIYVYPD111, respectively. The reactivity of linear epitope peptides, rBP26 and NMP was tested with 137 sheep sera by ELISAs, of which the two linear epitopes had 65–70% reactivity and NMP 90% consistent with the results of a combination of two standard serological tests. The results were helpful for evaluating the reactivity of BP26 antigen in M5-90.
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Affiliation(s)
- Jinlang Qiu
- Department of Transfusion Medicine, Southern Medical University, Guangzhou, China
| | - Wenjing Wang
- Department of Transfusion Medicine, Southern Medical University, Guangzhou, China
| | - Jingbo Wu
- Department of Transfusion Medicine, Southern Medical University, Guangzhou, China
| | - Hui Zhang
- Animal Science and Technology College, Shihezi University, Shihezi, China
| | - Yuanzhi Wang
- Animal Science and Technology College, Shihezi University, Shihezi, China
| | - Jun Qiao
- Animal Science and Technology College, Shihezi University, Shihezi, China
| | - Chuangfu Chen
- Animal Science and Technology College, Shihezi University, Shihezi, China
| | - Goege F. Gao
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences (CAS), Beijing, China
| | - Jean-Pierre Allain
- Department of Transfusion Medicine, Southern Medical University, Guangzhou, China
- Department of Haematology, University of Cambridge, Cambridge, UK
| | - Chengyao Li
- Department of Transfusion Medicine, Southern Medical University, Guangzhou, China
- * E-mail:
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