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Yang X, He Z, Zhang G, Lu J, Zhang H, Ren H, Tian Y, Yang H, Chen C, Li L, Fu Y, Allain JP, Li C, Wang W. Evaluation of Reactivity of Monoclonal Antibodies Against Omp25 of Brucella spp. Front Cell Infect Microbiol 2020; 10:145. [PMID: 32373546 PMCID: PMC7187720 DOI: 10.3389/fcimb.2020.00145] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 03/19/2020] [Indexed: 01/18/2023] Open
Abstract
Brucellosis is a serious zoonosis occurring mainly in developing countries, and its diagnosis is largely dependent on serologic detection and bacterial culture. In this study, we developed the murine monoclonal antibodies (mAbs) against a conserved and major outer membrane protein 25 (Omp25) of Brucella species (B. spp.) for use in clinical diagnosis. The mAbs to Omp25 were produced by hybridoma technique, which were utilized for developing various immunoassays for detection of Brucellae, including Western blot (WB), enzyme-linked immunosorbent assay (ELISA), immunochemical staining (ICS), immunofluorescence staining (IFS), and flow cytometry assay (FCM). A number of five mAbs (2B10, 4A12, 4F10, 6C12, and 8F3) specific to Omp25 were selected, including 2 IgG1, 2 IgG2a, and 1 IgG2b. Among them, mAbs 6C12, 8F3, and 4A12 reacted highly with B. melitensis (M5-90), B. abortus (S19, 104M, and 2308), and B. suis strain (S2). No cross-reactivity with Yersinia enterocolitica O:9, Salmonella spp., and Escherichia coli was found. By mapping Omp25 epitopes, mAb 6C12 was found as reacting with a semi-conformational epitope, and mAbs 4A12 and 8F3 as recognizing a different linear epitope, respectively. The paired mAbs were tested for detecting Brucella species, suggesting that 8F3 was suitable for solid phase capture and 6C12 or 4A12 was suitable for conjugation with HRP for detection of Brucella Omp25 in ELISA. The FCM was established by mAb 6C12 for detecting intracellular Brucellae-infected peripheral blood mononuclear cells (PBMCs) from brucellosis patients. In conclusion, mAbs against Omp25 are precious reagents for detection of Brucellae in clinical samples with various immunoassays. mAb 6C12-based FCM could be potentially used for the monitoring of therapeutic efficacy for brucellosis in clinical practice.
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Affiliation(s)
- Xin Yang
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Zuoping He
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China.,The Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
| | - Guoxia Zhang
- Department of Infectious Diseases, General Hospital of Heilongjiang Agricultural Reclamation Bureau, Harbin, China
| | - Jinhui Lu
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Hui Zhang
- School of Animal Science, Shihezi University, Shihezi, China
| | - Hui Ren
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Yanjun Tian
- Department of Infectious Diseases, General Hospital of Heilongjiang Agricultural Reclamation Bureau, Harbin, China
| | - Heng Yang
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China.,Department of Blood Transfusion, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Chuangfu Chen
- School of Animal Science, Shihezi University, Shihezi, China
| | - Linhai Li
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China.,Department of Laboratory Medicine, General Hospital of Southern Theatre Command of PLA, Guangzhou, China
| | | | - Jean-Pierre Allain
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China.,Emeritus Professor of Transfusion Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Chengyao Li
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
| | - Wenjing Wang
- Department of Transfusion Medicine, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, China
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Dang C, Tan T, Moffit D, Deboutteville JD, Barnes AC. Gender differences in hemocyte immune parameters of bivalves: the Sydney rock oyster Saccostrea glomerata and the pearl oyster Pinctada fucata. FISH & SHELLFISH IMMUNOLOGY 2012; 33:138-142. [PMID: 22562017 DOI: 10.1016/j.fsi.2012.04.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 03/21/2012] [Accepted: 04/15/2012] [Indexed: 05/31/2023]
Abstract
Many authors have highlighted a high inter-individual variability in immune parameters of marine bivalves. A high number of studies have reported the impact of external factors on hemocytes immune parameters such as temperature, salinity, pollutants or pathogens. However, only a few of them considered the impact of intrinsic parameters such as sex. Therefore, the present study assessed the impact of gender on hemocytes functions on two marine bivalves. Our results led to the conclusion that the gender contributes to this inter-individual variability. When studying the impact of an environmental variable, a pathogen or a pollutant, the sex of each animal should be determined and taken into account in the analysis and interpretation of immune parameters.
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Affiliation(s)
- Cécile Dang
- School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia.
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Muttray A, Reinisch C, Miller J, Ernst W, Gillis P, Losier M, Sherry J. Haemocytic leukemia in Prince Edward Island (PEI) soft shell clam (Mya arenaria): spatial distribution in agriculturally impacted estuaries. THE SCIENCE OF THE TOTAL ENVIRONMENT 2012; 424:130-142. [PMID: 22425172 DOI: 10.1016/j.scitotenv.2012.02.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 01/25/2012] [Accepted: 02/15/2012] [Indexed: 05/31/2023]
Abstract
Intensive farming of potatoes in Prince Edward Island (PEI) relies on the repeated and widespread application of fertilizers and pesticides. In PEI the main potato farming areas are in close proximity and drain directly to estuaries. Runoff from high agricultural activity watersheds could impact benthic organism health in the depositional zone of downstream estuaries. The estuarine filter feeder Mya arenaria (soft-shell clam) could be particularly vulnerable to both particle-adsorbed and water soluble contaminants. M. arenaria is susceptible to haemocytic leukemia. In May 2009, we established that heavily proliferated leukemia (HPL) prevalence was generally higher in PEI estuaries located downstream of high intensity potato farming (Dunk and Wilmot estuaries) watersheds than in estuaries downstream of lower intensity areas. Using Mab-1E10 based immunocytochemistry we observed that leukemic haemocytes from the Dunk and Wilmot estuaries were 1E10 negative whereas those from the Ox/Sheep estuary (low potato farming intensity) were 1E10 positive. The expression of genes in the p53 tumour suppressor pathway enabled us to differentiate groups of leukemic and normal M. arenaria, validating our diagnoses. In October 2009, we confirmed that HPL prevalence was elevated in the Dunk and Wilmot estuaries compared to reference (Souris River). Moreover, leukemia prevalence declined with distance from the river mouths along transects through the Dunk and Wilmot estuaries. The pesticides ß-endosulfan and α-endosulfan were detected in surface sediments from the Dunk and Wilmot estuaries, but not in sediments from either the Souris River or several other lower intensity potato farming watersheds. Our study provides evidence of an association between intensity of potato farming and prevalence of clam leukemia at downstream estuaries in PEI.
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Affiliation(s)
- Annette Muttray
- Environment Canada, Water Science & Technology Directorate, 867 Lakeshore Road, Burlington, ON, Canada L7R 4A6.
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