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Blacksell SD, Dhawan S, Kusumoto M, Le KK, Davis BJ, Summermatter K, O'Keefe J, Kozlovac J, Almuhairi SS, Sendow I, Scheel CM, Ahumibe A, Masuku ZM, Bennett AM, Kojima K, Harper DR, Hamilton K. The Biosafety Research Road Map: The Search for Evidence to Support Practices in the Laboratory- Shigella spp. APPLIED BIOSAFETY 2023; 28:96-101. [PMID: 37342516 PMCID: PMC10278014 DOI: 10.1089/apb.2022.0046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/23/2023]
Abstract
Introduction Shigella bacteria cause shigellosis, a gastrointestinal infection most often acquired from contaminated food or water. Methods In this review, the general characteristics of Shigella bacteria are described, cases of laboratory-acquired infections (LAIs) are discussed, and evidence gaps in current biosafety practices are identified. Results LAIs are undoubtedly under-reported. Owing to the low infectious dose, rigorous biosafety level 2 practices are required to prevent LAIs resulting from sample manipulation or contact with infected surfaces. Conclusions It is recommended that, before laboratory work with Shigella, an evidence-based risk assessment be conducted. Particular emphasis should be placed on personal protective equipment, handwashing, and containment practices for procedures that generate aerosols or droplets.
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Affiliation(s)
- Stuart D. Blacksell
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, Nuffield Department of Medicine Research Building, University of Oxford, Oxford, United Kingdom
| | - Sandhya Dhawan
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Marina Kusumoto
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Kim Khanh Le
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Ben J. Davis
- Mahidol-Oxford Tropical Research Medicine Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | | | - Joseph O'Keefe
- Ministry for Primary Industries, Wellington, New Zealand
| | - Joseph Kozlovac
- U.S. Department of Agriculture, Agricultural Research Service, Beltsville, Maryland, USA
| | | | - Indrawati Sendow
- Research Center for Veterinary Science, National Research and Innovation Agency, Indonesia
| | - Christina M. Scheel
- WHO Collaborating Center for Biosafety and Biosecurity, Office of the Associate Director for Laboratory Science, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
| | - Anthony Ahumibe
- Nigeria Centre for Disease Control and Prevention, Abuja, Nigeria
| | - Zibusiso M. Masuku
- National Institute for Communicable Diseases of the National Health Laboratory Services, Sandringham, South Africa
| | | | - Kazunobu Kojima
- Department of Epidemic and Pandemic Preparedness and Prevention, World Health Organization, Geneva, Switzerland
| | - David R. Harper
- The Royal Institute of International Affairs, London, United Kingdom
| | - Keith Hamilton
- World Organisation for Animal Health (OIE), Paris, France
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Padh H, Yagnik B, Sharma D, Desai P. EpiMix Based Novel Vaccine Candidate for Shigella: Evidence of Prophylactic Immunity in Balb/c Mice. Int J Pept Res Ther 2021; 27:1095-1110. [PMID: 33551691 PMCID: PMC7846920 DOI: 10.1007/s10989-020-10153-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/21/2020] [Indexed: 12/01/2022]
Abstract
Multidrug resistant Shigella is one of the leading causes of mortality in children and infants. Availability of vaccine could prevent the Shigella infection and reduce the mortality. Conventional approaches of vaccine development against shigellosis have not resulted in desirable vaccine. As shigellosis may be caused by multiple strains and serotypes, there is a need to develop a multivalent vaccine, capable of providing protection against multiple Shigella strains. To develop broad spectrum vaccine, we had previously derived a pool of conserved epitopes against Shigella by using multiple immunoinformatic tools. In this study, the identified conserved epitopes derived from the Outer Membrane Proteins A and C of Shigella were chemically synthesized, and the EpiMix made up of 5 epitopes coupled to a carrier protein, ovalbumin was developed and validated for its immunogenicity. The intramuscular immunization with EpiMix in Balb/c mice led to increase in EpiMix specific serum IgG, and significant increase in fecal IgA as well as in IL-4, IL-2and IFN-γ levels. Further, the EpiMix immunized mice showed protection when challenged against S. flexneri ATCC 12022 using the intraperitoneal route. Moreover, the analysis of cytokine profile and IFN-γ/IL4 ratio in post Shigella challenge immunized mice suggested the high levels of IFN-γ levels and possible dominance of Th1 response, playing pivotal role in the elimination of Shigella. Collectively, the results demonstrate the immunogenic potential and protective efficacy of the EpiMix in the murine shigellosis model. However, the detailed study and further optimisation of epitopes would substantiate the prospective use of EpiMix as a prophylactic candidate for vaccination.
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Affiliation(s)
- Harish Padh
- Sardar Patel University, Vallabh Vidyanagar, Gujarat 388120 India
| | - Bhrugu Yagnik
- Department of Cell and Molecular Biology, B.V. Patel Pharmaceutical Education and Research Development (PERD) Centre, Ahmedabad, Gujarat 380054 India
- BRD School of Bioscience, Sardar Patel University, Vallabh Vidyanagar, Gujarat 388120 India
| | - Drashya Sharma
- Department of Cell and Molecular Biology, B.V. Patel Pharmaceutical Education and Research Development (PERD) Centre, Ahmedabad, Gujarat 380054 India
- BRD School of Bioscience, Sardar Patel University, Vallabh Vidyanagar, Gujarat 388120 India
| | - Priti Desai
- Department of Cell and Molecular Biology, B.V. Patel Pharmaceutical Education and Research Development (PERD) Centre, Ahmedabad, Gujarat 380054 India
- Department of Biological Science and Biotechnology, Institute of Advanced Research (IAR), Institutional Area, Koba, Gandhinagar, Gujarat 382426 India
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Harikrishnan H, Banga Singh KK, Ismail A. Outer membrane proteins analysis of Shigella sonnei and evaluation of their antigenicity in Shigella infected individuals. PLoS One 2017; 12:e0182878. [PMID: 28846684 PMCID: PMC5573271 DOI: 10.1371/journal.pone.0182878] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 07/26/2017] [Indexed: 11/22/2022] Open
Abstract
Bacillary dysentery caused by infection with Shigella spp. remains as serious and common health problem throughout the world. It is a highly multi drug resistant organism and rarely identified from the patient at the early stage of infection. S. sonnei is the most frequently isolated species causing shigellosis in industrialized countries. The antigenicity of outer membrane protein of this pathogen expressed during human infection has not been identified to date. We have studied the antigenic outer membrane proteins expressed by S. sonnei, with the aim of identifying presence of specific IgA and IgG in human serum against the candidate protein biomarkers. Three antigenic OMPs sized 33.3, 43.8 and 100.3 kDa were uniquely recognized by IgA and IgG from patients with S. sonnei infection, and did not cross-react with sera from patients with other types of infection. The antigenic proteome data generated in this study are a first for OMPs of S. sonnei, and they provide important insights of human immune responses. Furthermore, numerous prime candidate proteins were identified which will aid the development of new diagnostic tools for the detection of S. sonnei.
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Affiliation(s)
- Hemavathy Harikrishnan
- Department of Medical Microbiology & Parasitology, School of Medical Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
| | - Kirnpal Kaur Banga Singh
- Department of Medical Microbiology & Parasitology, School of Medical Sciences, Health Campus, Universiti Sains Malaysia, Kelantan, Malaysia
- * E-mail:
| | - Asma Ismail
- Office of the Vice-Chancellor, Universiti Sains Malaysia, Penang, Malaysia
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Kelantan, Malaysia
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4
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Pastor Y, Camacho A, Gil AG, Ramos R, Ceráin ALD, Peñuelas I, Irache JM, Gamazo C. Effective protection of mice against Shigella flexneri with a new self-adjuvant multicomponent vaccine. J Med Microbiol 2017; 66:946-958. [PMID: 28721849 DOI: 10.1099/jmm.0.000527] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
PURPOSE The aim of this study was to develop an immunogenic protective product against Shigella flexneri by employing a simple and safe heat treatment-based strategy. METHODOLOGY The physicochemical characteristics of naturally produced (OMV) and heat-induced (HT) outer-membrane vesicles from S. flexneri were examined, including a comparison of the protein content of the products. Toxicological and biodistribution studies, and a preliminary experiment to examine the protective effectiveness of HT in a murine model of S. flexneri infection, were also included. RESULTS This method simultaneously achieves complete bacterial inactivation and the production of the HT vaccine product, leading to a safe working process. The obtained HT complex presented a similar morphology (electron microscopy) and chemical composition to the classical OMV, although it was enriched in some immunogens, such as lipoproteins, OmpA or OmpC, among others. The HT formulation was not toxic and biodistribution studies performed in mice demonstrated that the vaccine product remained in the small intestine after nasal administration. Finally, a single dose of HT administered nasally was able to protect mice against S. flexneri 2a. CONCLUSION The convenient and safe manufacturing process, and the preliminary biological evaluation, support the use of the self-adjuvanted HT complex as a new vaccine candidate to face shigellosis. Further development is required, such as additional immune analyses, to evaluate whether this new subunit vaccine can be useful in achieving full protection against Shigella.
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Affiliation(s)
- Yadira Pastor
- Department of Microbiology, Institute of Tropical Health, University of Navarra, 31008 Pamplona, Spain
| | - Ana Camacho
- Department of Microbiology, Institute of Tropical Health, University of Navarra, 31008 Pamplona, Spain
| | - Ana Gloria Gil
- Department of Toxicology, Institute of Tropical Health, University of Navarra, 31008 Pamplona, Spain
| | - Rocío Ramos
- Department of Nuclear Medicine, Clínica Universidad de Navarra, Institute of Tropical Health, University of Navarra 31008, Pamplona, Spain
| | - Adela López de Ceráin
- Department of Toxicology, Institute of Tropical Health, University of Navarra, 31008 Pamplona, Spain
| | - Iván Peñuelas
- Department of Nuclear Medicine, Clínica Universidad de Navarra, Institute of Tropical Health, University of Navarra 31008, Pamplona, Spain
| | - Juan M Irache
- Department of Pharmaceutical Technology, Institute of Tropical Health, University of Navarra, 31008 Pamplona, Spain
| | - Carlos Gamazo
- Department of Microbiology, Institute of Tropical Health, University of Navarra, 31008 Pamplona, Spain
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Hossain MU, Khan MA, Hashem A, Islam MM, Morshed MN, Keya CA, Salimullah M. Finding Potential Therapeutic Targets against Shigella flexneri through Proteome Exploration. Front Microbiol 2016; 7:1817. [PMID: 27920755 PMCID: PMC5118456 DOI: 10.3389/fmicb.2016.01817] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 10/28/2016] [Indexed: 11/13/2022] Open
Abstract
Background:Shigella flexneri is a gram negative bacteria that causes the infectious disease “shigellosis.” S. flexneri is responsible for developing diarrhea, fever, and stomach cramps in human. Antibiotics are mostly given to patients infected with shigella. Resistance to antibiotics can hinder its treatment significantly. Upon identification of essential therapeutic targets, vaccine and drug could be effective therapy for the treatment of shigellosis. Methods: The study was designed for the identification and qualitative characterization for potential drug targets from S. flexneri by using the subtractive proteome analysis. A set of computational tools were used to identify essential proteins those are required for the survival of S. flexneri. Total proteome (13,503 proteins) of S. flexneri was retrieved from NCBI and further analyzed by subtractive channel analysis. After identification of the metabolic proteins we have also performed its qualitative characterization to pave the way for the identification of promising drug targets. Results: Subtractive analysis revealed that a list of 53 targets of S. flexneri were human non-homologous essential metabolic proteins that might be used for potential drug targets. We have also found that 11 drug targets are involved in unique pathway. Most of these proteins are cytoplasmic, can be used as broad spectrum drug targets, can interact with other proteins and show the druggable properties. The functionality and drug binding site analysis suggest a promising effective way to design the new drugs against S. flexneri. Conclusion: Among the 53 therapeutic targets identified through this study, 13 were found highly potential as drug targets based on their physicochemical properties whilst only one was found as vaccine target against S. flexneri. The outcome might also be used as module as well as circuit design in systems biology.
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Affiliation(s)
- Mohammad Uzzal Hossain
- Department of Biotechnology and Genetic Engineering, Life Science Faculty, Mawlana Bhashani Science and Technology University Tangail, Bangladesh
| | - Md Arif Khan
- Department of Science and Humanities, Military Institute of Science and Technology, Mirpur Cantonment Dhaka, Bangladesh
| | - Abu Hashem
- Microbial Biotechnology Division, National Institute of Biotechnology Savar, Bangladesh
| | - Md Monirul Islam
- Department of Biotechnology and Genetic Engineering, Life Science Faculty, Mawlana Bhashani Science and Technology University Tangail, Bangladesh
| | - Mohammad Neaz Morshed
- Department of Science and Humanities, Military Institute of Science and Technology, Mirpur Cantonment Dhaka, Bangladesh
| | - Chaman Ara Keya
- Department of Biochemistry and Microbiology, North South University Bashundhara, Dhaka, Bangladesh
| | - Md Salimullah
- Molecular Biotechnology Division, National Institute of Biotechnology Savar, Bangladesh
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6
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DeLaine BC, Wu T, Grassel CL, Shimanovich A, Pasetti MF, Levine MM, Barry EM. Characterization of a multicomponent live, attenuated Shigella flexneri vaccine. Pathog Dis 2016; 74:ftw034. [PMID: 27106253 DOI: 10.1093/femspd/ftw034] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/17/2016] [Indexed: 11/12/2022] Open
Abstract
Shigella flexneri is a leading cause of diarrheal disease in children under five in developing countries. There is currently no licensed vaccine and broad spectrum protection requires coverage of multiple serotypes. The live attenuated vaccines CVD 1213 and CVD 1215 were derived from two prominent S. flexneri serotypes: S. flexneri 3a and S. flexneri 6. To provide broad-spectrum immunity, they could be combined with CVD 1208S, a S. flexneri 2a strain that demonstrated promising results in phase I and II clinical trials. Each strain contains a mutation in the guaBA operon. These vaccine candidates were tested in vitro and in vivo and were found to be auxotrophic for guanine and defective in intracellular replication, but capable of inducing cytokine production from both epithelial cells and macrophages. Both strains were attenuated for virulence in the guinea pig Serény test and induced robust serotype-specific antibody responses following immunization. Each strain induced homologous serotype protection against challenge and a mixed inoculum of the three S. flexneri vaccines conferred protection against all three virulent wild-type strains. These data support the use of CVD 1213, CVD 1215 and CVD 1208S in a multivalent vaccine to confer broad protection against disease caused by Shigella flexneri.
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Affiliation(s)
- BreOnna C DeLaine
- Institute for Global Health, Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Tao Wu
- Institute for Global Health, Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Christen L Grassel
- Institute for Global Health, Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Avital Shimanovich
- Institute for Global Health, Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Marcela F Pasetti
- Institute for Global Health, Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Myron M Levine
- Institute for Global Health, Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Eileen M Barry
- Institute for Global Health, Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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7
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Nag D, Sinha R, Mitra S, Barman S, Takeda Y, Shinoda S, Chakrabarti MK, Koley H. Heat killed multi-serotype Shigella immunogens induced humoral immunity and protection against heterologous challenge in rabbit model. Immunobiology 2015. [PMID: 26210044 DOI: 10.1016/j.imbio.2015.07.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Recently we have shown the homologous protective efficacy of heat killed multi-serotype Shigella (HKMS) immunogens in a guinea pig colitis model. In our present study, we have advanced our research by immunizing rabbits with a reduced number of oral doses and evaluating the host's adaptive immune responses. The duration of immunogenicity and subsequently protective efficacy was determined against wild type heterologous Shigella strains in a rabbit luminal model. After three successive oral immunizations with HKMS immunogens, serum and lymphocyte supernatant antibody titer against the heterologous shigellae were reciprocally increased and remained at an elevated level up to 180 days. Serogroup and serotype specific O-antigen of lipopolysaccharide and immunogenic proteins of heterologous challenge strains were detected by immunoblot assay. Up-regulation of IL-12p35, IFN-γ and IL-10 mRNA expression was detected in immunized rabbit peripheral blood mononuclear cells (PBMC) after stimulation with HKMS in vitro. HKMS-specific plasma cell response was confirmed by production of a relatively higher level of HKMS-specific IgG in immunized PBMC supernatant compared to control group. Furthermore, the immunized groups of rabbits exhibited complete protection against wild type heterologous shigellae challenge. Thus HKMS immunogens induced humoral and Th1-mediated adaptive immunity and provided complete protection in a rabbit model. These immunogens could be a broad spectrum non-living vaccine candidate for human use in the near future.
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Affiliation(s)
- Dhrubajyoti Nag
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Ritam Sinha
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Soma Mitra
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Soumik Barman
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Yoshifumi Takeda
- Collaborative Research Centre of Okayama University for Infectious Diseases, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Sumio Shinoda
- Collaborative Research Centre of Okayama University for Infectious Diseases, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - M K Chakrabarti
- Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, Kolkata, India
| | - Hemanta Koley
- Division of Bacteriology, National Institute of Cholera and Enteric Diseases, Kolkata, India.
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Development and preclinical evaluation of a trivalent, formalin-inactivated Shigella whole-cell vaccine. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2014; 21:366-82. [PMID: 24403527 DOI: 10.1128/cvi.00683-13] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Studies were undertaken to manufacture a multivalent Shigella inactivated whole-cell vaccine that is safe, effective, and inexpensive. By using several formalin concentrations, temperatures, and incubation periods, an optimized set of inactivation conditions was established for Shigella flexneri 2a, S. sonnei, and S. flexneri 3a to produce inactivated whole cells expressing a full repertoire of Ipa proteins and lipopolysaccharide (LPS). The inactivation conditions selected were treatment with 0.2% formalin (S. flexneri 2a and 3a) or 0.6% formalin (S. sonnei) for 48 h at 25°C. Vaccine formulations prepared under different inactivation conditions, in different doses (10E5, 10E7, and 10E9 cells), and with or without the inclusion of double-mutant heat-labile toxin (dmLT) were evaluated in mice. Two intranasal immunizations with ≥10E7 inactivated whole cells resulted in high levels of anti-Invaplex and moderate levels of LPS-specific IgG and IgA in serum and in lung and intestinal wash samples. Addition of dmLT to the vaccine formulations did not significantly enhance humoral immunogenicity. Minimal humoral responses for IpaB, IpaC, or IpaD were detected after immunization with inactivated whole Shigella cells regardless of the vaccine inactivation conditions. In guinea pigs, monovalent formulations of S. flexneri 2a of 3a or S. sonnei consisting of 10E8, 10E9, or 10E10 cells were protective in a keratoconjunctivitis assay. A trivalent formulation provided protection against all three serotypes (S. flexneri 2a, P = 0.018; S. flexneri 3a, P = 0.04; S. sonnei, P < 0.0001). The inactivated Shigella whole-cell vaccine approach incorporates an uncomplicated manufacturing process that is compatible with multivalency and the future development of a broadly protective Shigella vaccine.
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Barman S, Koley H, Ramamurthy T, Chakrabarti MK, Shinoda S, Nair GB, Takeda Y. Protective immunity by oral immunization with heat-killedShigellastrains in a guinea pig colitis model. Microbiol Immunol 2013; 57:762-71. [DOI: 10.1111/1348-0421.12095] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 08/28/2013] [Accepted: 08/31/2013] [Indexed: 01/29/2023]
Affiliation(s)
- Soumik Barman
- National Institute of Cholera and Enteric Diseases; P-33, C.I.T. Road, Scheme XM
| | - Hemanta Koley
- National Institute of Cholera and Enteric Diseases; P-33, C.I.T. Road, Scheme XM
| | | | | | - Sumio Shinoda
- Collaborative Research Center of Okayama University for Infectious Diseases in India; 67 Dr. S. C. Banerjee Road, ID Hospital Campus, Beliaghata Kolkata 700 010
| | - Gopinath Balakrish Nair
- Translational Health Science and Technology Institute; Plot No. 496, Phase-III, Udyog Vihar Gurgaon Haryana 122 016 India
| | - Yoshifumi Takeda
- Collaborative Research Center of Okayama University for Infectious Diseases in India; 67 Dr. S. C. Banerjee Road, ID Hospital Campus, Beliaghata Kolkata 700 010
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Shigella flexneri 3a outer membrane protein C epitope is recognized by human umbilical cord sera and associated with protective activity. PLoS One 2013; 8:e70539. [PMID: 23940590 PMCID: PMC3734276 DOI: 10.1371/journal.pone.0070539] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 06/20/2013] [Indexed: 11/19/2022] Open
Abstract
Shigella flexneri 3a is one of the five major strains of the Shigella genus responsible for dysentery, especially among children, in regions of high poverty and poor sanitation. The outer membrane proteins (OMP) of this bacterium elicit immunological responses and are considered a prime target for vaccine development. When injected into mice they elicit a protective immunological response against a lethal dose of the pathogen. The OMPs from S. flexneri 3a were isolated and resolved by two-dimension-SDS-PAGE. Two 38-kDa spots were of particular interest since in our earlier studies OMPs of such molecular mass were found to interact with umbilical cord sera. These two spots were identified as OmpC by ESI-MS/MS spectrometry. By DNA sequencing, the ompC gene from S. flexneri 3a was identical to ompC from S. flexneri 2a [Gene Bank: 24113600]. A 3D model of OmpC was built and used to predict B-cell type (discontinuous) antigenic epitopes. Six epitopes bearing the highest score were selected and the corresponding peptides were synthesized. Only the peptides representing loop V of OmpC reacted strongly with the umbilical cord serum immunoglobulins. To determine which amino acids are essential for the antigenic activity of the epitope, the loop V was scanned with a series of dodecapeptides. The peptide RYDERY was identified as a minimal sequence for the loop V epitope. Truncation at either the C- or N-terminus rendered this peptide inactive. Apart from C-terminal tyrosine, substitution of each of the remaining five amino acids with glycine, led to a precipitous loss of immunological activity. This peptide may serve as a ligand in affinity chromatography of OmpC-specific antibodies and as a component of a vaccine designed to boost human immune defenses against enterobacterial infections.
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11
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Pore D, Chakrabarti MK. Outer membrane protein A (OmpA) from Shigella flexneri 2a: a promising subunit vaccine candidate. Vaccine 2013; 31:3644-50. [PMID: 23764536 DOI: 10.1016/j.vaccine.2013.05.100] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 05/20/2013] [Accepted: 05/24/2013] [Indexed: 02/08/2023]
Abstract
Shigellosis is the leading cause of childhood mortality and morbidity. Despite many years of extensive research a practical vaccine is not yet available against the disease. Recent studies illustrate that bacterial outer membrane proteins are budding target as vaccine antigen. Outer membrane proteins A (OmpA) are among the most immunodominant antigens in the outer membrane of gram negative bacteria and possess many characteristics desired of a vaccine candidate. We observe that OmpA of Shigella flexneri 2a is crossreactive and common antigen among Shigella spp. and the epitope is widely exposed on the cell surface as well as capable of evoking protective immunity in mice. The protective immunity involves participation of both the humoral and cellular immune responses, since OmpA boosts rapid induction of IgG and IgA in both the systemic and mucosal compartments and also activates Th1 cells. The immunopotentiating activity of OmpA is mediated by its ability to bind and stimulate macrophages and up-regulate the surface expression of MHCII, CD80 and CD40, leading to activation of CD4(+) T cells to secrete cytokines and express chemokine receptor and IL-12Rβ2, thereby orchestrating the bridge between innate and adaptive immune responses. This ability is dependent on Toll-like receptor 2 (TLR2), as demonstrated by lack of response by TLR2 knockdown macrophages to OmpA. Hence this property of OmpA to link innate and adaptive immunity via TLR2 offers a novel vista to develop vaccine against shigellosis.
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Affiliation(s)
- Debasis Pore
- Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, P-33, C.I.T. Road, Scheme-XM, Beliaghata, Kolkata 700010, West Bengal, India
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Camacho A, Souza-Rebouças J, Irache J, Gamazo C. Towards a non-living vaccine against Shigella flexneri: From the inactivation procedure to protection studies. Methods 2013; 60:264-8. [DOI: 10.1016/j.ymeth.2012.09.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Accepted: 09/22/2012] [Indexed: 11/27/2022] Open
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Yung-Hung RL, Ismail A, Lim TS, Choong YS. A 35kDa antigenic protein from Shigella flexneri: In silico structural and functional studies. Biochem Biophys Res Commun 2011; 415:229-34. [DOI: 10.1016/j.bbrc.2011.09.116] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Accepted: 09/23/2011] [Indexed: 11/27/2022]
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14
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Pore D, Mahata N, Pal A, Chakrabarti MK. Outer membrane protein A (OmpA) of Shigella flexneri 2a, induces protective immune response in a mouse model. PLoS One 2011; 6:e22663. [PMID: 21818362 PMCID: PMC3144247 DOI: 10.1371/journal.pone.0022663] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Accepted: 06/28/2011] [Indexed: 02/03/2023] Open
Abstract
Background In our earlier studies 34 kDa outer membrane protein (OMP) of Shigella flexneri 2a has been identified as an efficient immunostimulant. Key Results In the present study MALDI-TOF MS analysis of the purified 34 kDa OMP of Shigella flexneri 2a shows considerable sequence homology (Identity 65%) with the OmpA of S. flexneri 2a. By using the specific primers, the gene of interest has been amplified from S. flexneri 2a (N.Y-962/92) genomic DNA, cloned in pET100/D-TOPO® vector and expressed using induction with isopropyl thiogalactoside (IPTG) for the first time. Immunogenicity and protective efficacy of the recombinant OmpA has been evaluated in an intranasally immunized murine pulmonary model. The recombinant protein induces significantly enhanced protein specific IgG and IgA Abs in both mucosal and systemic compartments and IgA secreting cells in the systemic compartment (spleen). The mice immunized with OmpA have been protected completely from systemic challenge with a lethal dose of virulent S. flexneri 2a. Immunization with the protein causes mild polymorphonuclear neutrophil infiltration in the lung, without inducing the release of large amounts of proinflammatory cytokines. Conclusion These results suggest that the OmpA of S. flexneri 2a can be an efficacious mucosal immunogen inducing protective immune responses. Our findings also demonstrate that antibodies and Th1 immune response may be associated with the marked protective efficacy of immunized mice after intranasal shigellae infection.
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Affiliation(s)
- Debasis Pore
- Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, Beliaghata, Kolkata, West Bengal, India
| | - Nibedita Mahata
- Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, Beliaghata, Kolkata, West Bengal, India
| | - Amit Pal
- Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, Beliaghata, Kolkata, West Bengal, India
| | - Manoj K. Chakrabarti
- Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, Beliaghata, Kolkata, West Bengal, India
- * E-mail:
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15
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Kaminski RW, Oaks EV. Inactivated and subunit vaccines to prevent shigellosis. Expert Rev Vaccines 2010; 8:1693-704. [PMID: 19943764 DOI: 10.1586/erv.09.127] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Shigellosis remains a formidable disease globally, with children of the developing world bearing the greatest number of infections. The need for an affordable, safe and efficacious vaccine has persisted for decades. Vaccines to prevent shigellosis can be divided into living and nonliving approaches. Several nonliving Shigella vaccines are currently at different stages of development and show substantial promise. Outlined here is an overview of multiple nonliving vaccine technologies, highlighting their current status and recent advances in testing. In addition, gaps in the knowledge base regarding immune mechanisms of protection are explored.
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Affiliation(s)
- Robert W Kaminski
- Division of Bacterial and Rickettsial Diseases, Walter Reed Army Institute of Research, 503 Robert Grant Avenue, Silver Spring, MD 20910, USA
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16
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Pore D, Chowdhury P, Mahata N, Pal A, Yamasaki S, Mahalanabis D, Chakrabarti MK. Purification and characterization of an immunogenic outer membrane protein of Shigella flexneri 2a. Vaccine 2009; 27:5855-64. [PMID: 19660587 DOI: 10.1016/j.vaccine.2009.07.054] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Revised: 07/13/2009] [Accepted: 07/18/2009] [Indexed: 10/20/2022]
Abstract
In the present study we purified 34 kDa major outer membrane protein (MOMP) of Shigella flexneri 2a for the first time, which was cross-reactive and antigenically conserved among Shigella spp. and the epitope was surface exposed on the intact bacterium. The purified antigen was found to be glycosylated, which aids in binding to macrophages and up-regulated the production of nitric oxide, granulocyte-colony stimulating factor and IL-12p70, indicating that the MOMP is immunogenic and has the ability to commence protective immune responses against intracellular pathogens, thereby it may be considered as a potential vaccine candidate.
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Affiliation(s)
- Debasis Pore
- Division of Pathophysiology, National Institute of Cholera and Enteric Diseases, P-33, C.I.T. Road, Scheme-XM, Beliaghata, Kolkata 700010, West Bengal, India
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17
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Witkowska D, Masłowska E, Staniszewska M, Szostko B, Jankowski A, Gamian A. Enterobacterial 38-kDa outer membrane protein is an age-dependent molecular marker of innate immunity and immunoglobulin deficiency as results from its reactivity with IgG and IgA antibody. ACTA ACUST UNITED AC 2007; 48:205-14. [PMID: 17064276 DOI: 10.1111/j.1574-695x.2006.00137.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
In earlier studies on an animal model we observed protective properties of outer membrane proteins (OMPs) of Shigella, Hafnia, and Escherichia coli strains. In order to investigate human sera for reactivity with OMPs we subjected these proteins to immunoblotting with umbilical cord plasma and sera from children and adults. The IgG and IgA antibodies interacted primarily with a 38-kDa protein, in similar way for several enterobacterial strains, but different for Pseudomonas aeruginosa. This observation prompted us to determine the reactivity with the purified 38-kDa OMP in the sera of several groups of children. The reactivity of the protein from Shigella flexneri serotype 3a with sera in ELISA was age dependent, increasing from low reactivity in infants to the adult antibody level. The IgG and IgA antibody specific response thus revealed the normal pattern of immunity. The level of IgA and IgG antibody was significantly low in child patients with IgA and/or IgG immunoglobulin deficiencies, but was at the healthy control level in children with recurrent respiratory tract inflammation. These data correlated with total IgA and IgG levels in immunoglobulin-deficient children. The results indicate that this protein may serve as an immunodiagnostic marker, but also as an antigen carrier in vaccines.
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Affiliation(s)
- Danuta Witkowska
- Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wrocław, Poland.
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18
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Osorio M, Bray MD, Walker RI. Vaccine potential for inactivated shigellae. Vaccine 2007; 25:1581-92. [PMID: 17178431 DOI: 10.1016/j.vaccine.2006.11.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2006] [Revised: 11/01/2006] [Accepted: 11/06/2006] [Indexed: 11/18/2022]
Abstract
We used human monocyte-derived dendritic cells (DC) and Balb/c mice as models to establish the immunogenic and protective potential of formalin-inactivated Shigella spp. Incubation of DC with inactivated or live bacteria induced DC maturation and cytokine release. Mice immunized orally or intranasally with killed S. flexneri, S. sonnei, or S. dysenteriae developed IgG and fecal IgA titers to the homologous LPS. Following respiratory challenge with the live homologous organisms, 80-100% survival was seen in all vaccinated groups compared to negligible survival in mice given PBS. Oral or intranasal immunization with an inactivated S. flexneri 2a strain (CVD1203) expressing the CFA/I and CS3 antigens of enterotoxigenic Escherichia coli induced IgG responses to both heterologous antigens. These in vivo and in vitro data indicate that inactivated shigellae retain the ability to interact effectively with key antigen presenting cells and induce protective immune responses in mice.
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Affiliation(s)
- Manuel Osorio
- Division of Bacterial, Parasitic and Allergenic Products, Center for Biologics Evaluation and Research, Food and Drug Administration, 1401 Rockville Pike, Rockville, MD 20852-1448, United States
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McKenzie R, Walker RI, Nabors GS, Van De Verg LL, Carpenter C, Gomes G, Forbes E, Tian JH, Yang HH, Pace JL, Jackson WJ, Bourgeois AL. Safety and immunogenicity of an oral, inactivated, whole-cell vaccine for Shigella sonnei: preclinical studies and a Phase I trial. Vaccine 2006; 24:3735-45. [PMID: 16095766 DOI: 10.1016/j.vaccine.2005.07.014] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Orally delivered, inactivated whole-cell vaccines are safe methods of inducing local and systemic immunity. To increase surface proteins associated with adherence and invasion, Shigella sonnei were grown in BHI broth containing deoxycholate. A whole-cell vaccine (SsWC) was then produced by formalin inactivation. In pre-clinical studies, the SsWC vaccine was immunogenic and protected against S. sonnei-induced keratoconjunctivitis in the guinea pig model. In a randomized, double-blind, placebo-controlled, Phase I study, 10 evaluable subjects received either three doses of SsWC on Days 0, 14, and 28 (N = 3); five doses of SsWC on Days 0, 2, 4, 6, and 28 (N = 4); or placebo (N = 3). Each dose contained 2.0 x 10(10) inactivated cells. Serum and fecal antibodies against SsWC, LPS, and IpaC were measured by ELISA. A > or = 4-fold increase in titer was considered significant. Both SsWC dosing regimens were well tolerated. No fever or severe gastrointestinal symptoms were noted by any of the vaccinated subjects. Antibody responses were similar in the two dosing groups. Serum IgG or IgA responses to SsWC were seen in six of seven vaccinees (86%), to LPS in four of seven (57%), and to IpaC in five of seven (61%). Fecal IgA responses to these three antigens developed in five of five, three of five, and three of five subjects, respectively. Among the seven vaccinees, geometric mean rises in serum IgA levels to all three immunogens were significant; IgG increases trended toward significance (paired one-tailed t-test). We conclude that SsWC was immunogenic and protective in animal studies and well tolerated and immunogenic in a Phase I trial.
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MESH Headings
- Administration, Oral
- Adolescent
- Adult
- Animals
- Antibodies, Bacterial/analysis
- Antibodies, Bacterial/blood
- Antigens, Bacterial/immunology
- Disease Models, Animal
- Dysentery, Bacillary/immunology
- Dysentery, Bacillary/prevention & control
- Enzyme-Linked Immunosorbent Assay
- Feces/chemistry
- Fixatives
- Formaldehyde
- Guinea Pigs
- Humans
- Immunoglobulin A/analysis
- Immunoglobulin A/blood
- Immunoglobulin G/analysis
- Immunoglobulin G/blood
- Keratoconjunctivitis/immunology
- Keratoconjunctivitis/prevention & control
- Lipopolysaccharides/immunology
- Male
- Middle Aged
- Placebos
- Shigella Vaccines/administration & dosage
- Shigella Vaccines/adverse effects
- Shigella Vaccines/immunology
- Shigella sonnei/immunology
- Vaccines, Inactivated/administration & dosage
- Vaccines, Inactivated/adverse effects
- Vaccines, Inactivated/immunology
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Affiliation(s)
- R McKenzie
- Center for Immunization Research, Department of International Health, Johns Hopkins University, Bloomberg School of Public Health, 624 N. Broadway, (HH, Rm 203), Baltimore, MD 21205, USA.
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20
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Oaks EV, Turbyfill KR. Development and evaluation of a Shigella flexneri 2a and S. sonnei bivalent invasin complex (Invaplex) vaccine. Vaccine 2005; 24:2290-301. [PMID: 16364513 DOI: 10.1016/j.vaccine.2005.11.040] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2005] [Revised: 10/24/2005] [Accepted: 11/18/2005] [Indexed: 11/19/2022]
Abstract
Over 160 million cases of shigellosis occur annually worldwide, with the two most prevalent species being Shigella flexneri and S. sonnei. Protective immunity against Shigella infection is primarily directed at the lipopolysaccharide (LPS) of the homologous serotype, so it may be necessary to combine monovalent vaccines for multiple Shigella serotypes to construct a multivalent vaccine against predominant serotypes. Recently, we described a subcellular vaccine isolated from virulent S. flexneri, consisting of proteins (including the invasins IpaB and IpaC) and LPS, that protected mice and guinea pigs from homologous challenge. In the present study, a bivalent Invaplex vaccine consisting of S. flexneri 2a and S. sonnei Invaplex was used to intranasally immunize mice and guinea pigs to determine the bivalent vaccine's immunogenicity and protective capacity against challenge with either strain. Mice and guinea pigs immunized with the bivalent S. flexneri 2a/S. sonnei Invaplex vaccine produced serum IgA and IgG antibodies to S. flexneri LPS, S. sonnei LPS, the homologous Invaplex and the water extract antigens (invasins) as determined by ELISA. The immune responses in animals immunized with the bivalent vaccine were similar to responses in animals immunized with the monovalent Invaplex vaccines. Mice and guinea pigs immunized with the bivalent vaccine were protected from a lethal lung challenge (mice, P<0.001) or severe keratoconjunctivitis (guinea pigs, P< or = 0.002) after challenge with either S. flexneri 2a or S. sonnei. Animals immunized with monovalent Invaplex vaccines were protected (P<0.001) against the homologous agent at levels comparable to the bivalent vaccine. After challenge, immunized animals demonstrated boosts in antibody titers to LPS, water extract antigens and Invaplex. These studies indicate that the subcellular Invaplex vaccine will be readily adaptable to a multivalent vaccine approach for shigellosis.
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Affiliation(s)
- Edwin V Oaks
- Walter Reed Army Institute of Research, Silver Spring, MD 20910-7510, USA.
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Peng X, Ye X, Wang S. Identification of novel immunogenic proteins of Shigella flexneri 2a by proteomic methodologies. Vaccine 2004; 22:2750-6. [PMID: 15246607 DOI: 10.1016/j.vaccine.2004.01.038] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2003] [Accepted: 01/19/2004] [Indexed: 12/13/2022]
Abstract
Shigella spp. are one of the most important etiological factors for people who are living in developing countries and travelers to tropical countries. High priority has been given by the World Health Organization to the development of vaccines to control Shigellosis caused by these bacteria. However, information regarding to profile of immunogenic proteins of Shigella is not available now. In the present study, sub-immunoproteomics was applied to screen novel immunogenic proteins which could be reacted with antisera produced by challenge of a whole bacterium. Our results indicated that 13 immunogens were identified, in which seven proteins and six proteins from outer membrane and soluble proteome, respectively. Of the 13 proteins, 12 showed to be novel immunogens. These results suggest that immunoproteomics can greatly improve the chances of identification and result in discovery of novel immunogenic proteins.
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Affiliation(s)
- Xuanxian Peng
- Center for Proteomics, Department of Biology, School of Life Sciences, Xiamen University, Fujian 361005, PR China.
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