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Smith K, Garman L, Norris K, Muther J, Duke A, Engler RJM, Nelson MR, Collins LC, Spooner C, Guthridge C, James JA. Insufficient Anthrax Lethal Toxin Neutralization Is Associated with Antibody Subclass and Domain Specificity in the Plasma of Anthrax-Vaccinated Individuals. Microorganisms 2021; 9:microorganisms9061204. [PMID: 34199431 PMCID: PMC8229884 DOI: 10.3390/microorganisms9061204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 05/25/2021] [Accepted: 05/28/2021] [Indexed: 11/17/2022] Open
Abstract
Anthrax vaccine adsorbed (AVA) is a significant line of defense against bioterrorist attack from Bacillus anthracis spores. However, in a subset of individuals, this vaccine may produce a suboptimal quantity of anti-protective antigen (PA), antibodies that are poorly neutralizing, and/or antibody titers that wane over time, necessitating annual boosters. To study individuals with such poor responses, we examine the properties of anti-PA in a subset of vaccinated individuals that make significant quantities of antibody but are still unable to neutralize toxin. In this cohort, characterized by poorly neutralizing antibody, we find that increased IgG4 to IgG1 subclass ratios, low antibody avidity, and insufficient antibody targeting domain 4 associate with improper neutralization. Thus, future vaccines and vaccination schedules should be formulated to improve these deficiencies.
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Affiliation(s)
- Kenneth Smith
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, 825 NE 13th St., Oklahoma City, OK 73104, USA; (K.N.); (J.M.); (A.D.); (C.G.)
- Correspondence: (K.S.); (J.A.J.); Tel.: +1-405-271-3275 (K.S.); +1-405-271-4987 (J.A.J.)
| | - Lori Garman
- Department of Genes and Human Disease, Oklahoma Medical Research Foundation, 825 NE 13th St., Oklahoma City, OK 73104, USA;
| | - Kathleen Norris
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, 825 NE 13th St., Oklahoma City, OK 73104, USA; (K.N.); (J.M.); (A.D.); (C.G.)
| | - Jennifer Muther
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, 825 NE 13th St., Oklahoma City, OK 73104, USA; (K.N.); (J.M.); (A.D.); (C.G.)
| | - Angie Duke
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, 825 NE 13th St., Oklahoma City, OK 73104, USA; (K.N.); (J.M.); (A.D.); (C.G.)
| | - Renata J. M. Engler
- Walter Reed National Military Medical Center, 8901 Wisconsin Ave, Bethesda, MD 20814, USA; (R.J.M.E.); (M.R.N.); (L.C.C.); (C.S.)
| | - Michael R. Nelson
- Walter Reed National Military Medical Center, 8901 Wisconsin Ave, Bethesda, MD 20814, USA; (R.J.M.E.); (M.R.N.); (L.C.C.); (C.S.)
| | - Limone C. Collins
- Walter Reed National Military Medical Center, 8901 Wisconsin Ave, Bethesda, MD 20814, USA; (R.J.M.E.); (M.R.N.); (L.C.C.); (C.S.)
| | - Christina Spooner
- Walter Reed National Military Medical Center, 8901 Wisconsin Ave, Bethesda, MD 20814, USA; (R.J.M.E.); (M.R.N.); (L.C.C.); (C.S.)
| | - Carla Guthridge
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, 825 NE 13th St., Oklahoma City, OK 73104, USA; (K.N.); (J.M.); (A.D.); (C.G.)
| | - Judith A. James
- Department of Arthritis and Clinical Immunology, Oklahoma Medical Research Foundation, 825 NE 13th St., Oklahoma City, OK 73104, USA; (K.N.); (J.M.); (A.D.); (C.G.)
- Department of Microbiology and Immunology, Oklahoma University Health Science Center, 940 Stanton L. Young Blvd, Oklahoma City, OK 73104, USA
- Departments of Medicine and Pathology, Oklahoma University Health Science Center, 1000 Stanton L. Young Blvd, Oklahoma City, OK 73104, USA
- Correspondence: (K.S.); (J.A.J.); Tel.: +1-405-271-3275 (K.S.); +1-405-271-4987 (J.A.J.)
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Duong ND, Nguyen-Phuoc KH, Do KYT, Nguyen NTT, Tran TL, Tran-Van H. Production of polyclonal antibody against the recombinant PirB vp protein of Vibrio parahaemolyticus. J Genet Eng Biotechnol 2021; 19:70. [PMID: 33977321 PMCID: PMC8113428 DOI: 10.1186/s43141-021-00172-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 04/21/2021] [Indexed: 11/10/2022]
Abstract
BACKGROUND Acute hepatopancreatic necrosis disease (AHPND) is caused by toxin-producing strains of Vibrio parahaemolyticus which contain deadly binary toxins PirAvp and PirBvp encoded in pVA1 plasmid. The polyclonal antibodies against PirBvp protein could be used to develop immunochromatographic test strip for in-field diagnosis of AHPND. RESULTS In this study, PirBvp gene was amplified, cloned, and expressed in E. coli. The expressed protein was detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blot probed with 6xHis antibodies. Then, the recombinant PirBvp (rPirBvp) was purified using Ni-Sepharose column. Rabbits were immunized with the purified rPirBvp, and produced antibodies were analyzed using Ouchterlony double immunodiffusion. The antibody titration and antibody purification were performed by ELISA and affinity chromatography, respectively. Finally, antibody specificity and sensitivity were evaluated by dot blotting. The present study showed a high titer of polyclonal antibodies in rabbit serum after immunization and the titer increased steadily during the immunization schedule. The highest titer of antibody reached up to 2,560,000 with LOD of 0.1 ng/mL. The purified antibodies showed no cross-reactivity with proteins from other Vibrio species, and the detection threshold ranged from 6.25 to 12.5 ng toxin/dot. CONCLUSION This study highlights the production of high titer and specific polyclonal antibodies as an initial material towards the development of lateral-flow strip test.
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Affiliation(s)
- Ngoc-Diem Duong
- University of Science, 227 Nguyen Van Cu Street, Ward 4, District 5, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
- Pasteur Institute, 167 Pasteur Street, Vo Thi Sau Ward, District 3, Ho Chi Minh City, Vietnam
| | - Khai-Hoan Nguyen-Phuoc
- University of Science, 227 Nguyen Van Cu Street, Ward 4, District 5, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
| | - Kim-Yen Thi Do
- Pasteur Institute, 167 Pasteur Street, Vo Thi Sau Ward, District 3, Ho Chi Minh City, Vietnam
| | - Nguyet-Thu Thi Nguyen
- Pasteur Institute, 167 Pasteur Street, Vo Thi Sau Ward, District 3, Ho Chi Minh City, Vietnam
| | - Thuoc Linh Tran
- University of Science, 227 Nguyen Van Cu Street, Ward 4, District 5, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
| | - Hieu Tran-Van
- University of Science, 227 Nguyen Van Cu Street, Ward 4, District 5, Ho Chi Minh City, Vietnam
- Vietnam National University, Ho Chi Minh City, Vietnam
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Nguyen-Phuoc KH, Duong ND, Phan TV, Do KYT, Nguyen NTT, Tran TL, Tran-Van H. Generation and evaluation of polyclonal antibodies specific for ToxA from Vibrio parahaemolyticus causing acute hepatopancreatic necrosis disease (AHPND) in shrimp. MOLECULAR BIOLOGY RESEARCH COMMUNICATIONS 2021; 10:23-32. [PMID: 33681394 PMCID: PMC7936389 DOI: 10.22099/mbrc.2020.38774.1561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Acute Hepatopancreatic Necrosis Disease (AHPND) is a newly emerging shrimp disease with mortality up to 100 percent caused by Vibrio parahaemolyticus which carries a plasmid encoding for two toxins, ToxA and ToxB. In 2013, the Global Aquaculture Alliance (GAA) estimated shrimp farming decline in Asia accounted for 1-billion US dollar lost. Currently, diagnosis using PCR method does not meet the demand of in situ detection, which is based on antigen-antibody interaction, has not been developed yet. In this present study, we proceeded to create the toxin and its antibody for lateral flow development. First, recombinant toxin ToxA was generated by gene manipulation. After that, purified ToxA was used to immunize rabbits. Finally, antisera from rabbits and protein-A purified antibodies were evaluated for titer, specificity, and detection threshold. Results showed that recombinant ToxA was overexpressed in soluble fraction at 37oC with 1mM IPTG. Purification by affinity chromatography was able to isolate recombinant ToxA with the purity up to 94.49%. In ELISA experiment, the immunized antisera reached a titer of up to 1/5,210,000 with 1µg/ml of antigen, and detection threshold was 100ng recombinant toxin. After purification, the detection threshold of purified polyclonal antibodies was 25ng toxin per dot. These results laid a groundwork for the development of AHPND detection kit based on antigen - antibody interactions.
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Affiliation(s)
- Khai-Hoan Nguyen-Phuoc
- Department of Molecular and Environmental Biotechnology, Faculty of Biology and Biotechnology, University of Science, Ho Chi Minh, Vietnam.,Vietnam National University, Ho Chi Minh, Vietnam.,First authorship shared
| | - Ngoc-Diem Duong
- Department of Molecular and Environmental Biotechnology, Faculty of Biology and Biotechnology, University of Science, Ho Chi Minh, Vietnam.,Vietnam National University, Ho Chi Minh, Vietnam.,Pasteur Institute in Ho Chi Minh City, Vietnam.,First authorship shared
| | - Thach Van Phan
- Department of Molecular and Environmental Biotechnology, Faculty of Biology and Biotechnology, University of Science, Ho Chi Minh, Vietnam.,Vietnam National University, Ho Chi Minh, Vietnam
| | | | | | - Thuoc Linh Tran
- Department of Molecular and Environmental Biotechnology, Faculty of Biology and Biotechnology, University of Science, Ho Chi Minh, Vietnam.,Vietnam National University, Ho Chi Minh, Vietnam
| | - Hieu Tran-Van
- Department of Molecular and Environmental Biotechnology, Faculty of Biology and Biotechnology, University of Science, Ho Chi Minh, Vietnam.,Vietnam National University, Ho Chi Minh, Vietnam
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Rapid Detection of Enterobacter Sakazakii in milk Powder using amino modified chitosan immunomagnetic beads. Int J Biol Macromol 2016; 93:615-622. [PMID: 27616695 DOI: 10.1016/j.ijbiomac.2016.09.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Revised: 09/02/2016] [Accepted: 09/07/2016] [Indexed: 12/11/2022]
Abstract
Chitosan immunomagnetic beads (CIBs) were first prepared through converting hydroxyl groups of natural polymer material-chitosan into amino groups using epichlorohydrin and ethylenediamine as modification agent and then coupling with polyclonal antibodies of Enterobacter sakazakii using glutaraldehyde as cross-linking agent. The beads before coupling with antibodies were characterized by magnetic property measurement, FTIR, SEM and XRD technologies. In the assay a natural polysaccharide-chitosan, which has good biological and chemical properties such as non-toxicity, biocompatibility and high chemical reactivity was first used for synthesis of immunomagnetic beads. The detection method first established in this paper that combined the beads with chromogenic medium together to rapid detect E. sakazakii in milk powder could greatly improve the detection specificity and working efficiency. The beads exhibited a maximum capturing capacity of 1×106cfu/g with the detection sensitivity of 4cfu/g. The results demonstrate that the assay is a straightforward, specific and sensitive alternative for rapid detection of E.sakazakii in food matrix. The total analysis time was as little as about 25h, which greatly shorten the detection time. The method can provides new ideas not only to preparation technique of immunomagnetic beads but to imunne detection technique in food safety.
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