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Ferreira EL, Batista MT, Cavalcante RCM, Pegos VR, Passos HM, Silva DA, Balan A, Ferreira LCS, Ferreira RCC. Sublingual immunization with the phosphate-binding-protein (PstS) reduces oral colonization by Streptococcus mutans. Mol Oral Microbiol 2015; 31:410-22. [PMID: 26462737 DOI: 10.1111/omi.12142] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/09/2015] [Indexed: 11/29/2022]
Abstract
Bacterial ATP-binding cassette (ABC) transporters play a crucial role in the physiology and pathogenicity of different bacterial species. Components of ABC transporters have also been tested as target antigens for the development of vaccines against different bacterial species, such as those belonging to the Streptococcus genus. Streptococcus mutans is the etiological agent of dental caries, and previous studies have demonstrated that deletion of the gene encoding PstS, the substrate-binding component of the phosphate uptake system (Pst), reduced the adherence of the bacteria to abiotic surfaces. In the current study, we generated a recombinant form of the S. mutans PstS protein (rPstS) with preserved structural features, and we evaluated the induction of antibody responses in mice after sublingual mucosal immunization with a formulation containing the recombinant protein and an adjuvant derived from the heat-labile toxin from enterotoxigenic Escherichia coli strains. Mice immunized with rPstS exhibited systemic and secreted antibody responses, measured by the number of immunoglobulin A-secreting cells in draining lymph nodes. Serum antibodies raised in mice immunized with rPstS interfered with the adhesion of bacteria to the oral cavity of naive mice challenged with S. mutans. Similarly, mice actively immunized with rPstS were partially protected from oral colonization after challenge with the S. mutans NG8 strain. Therefore, our results indicate that S. mutans PstS is a potential target antigen capable of inducing specific and protective antibody responses after sublingual administration. Overall, these observations raise interesting perspectives for the development of vaccines to prevent dental caries.
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Affiliation(s)
- E L Ferreira
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil
| | - M T Batista
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil
| | - R C M Cavalcante
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil
| | - V R Pegos
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil.,Biosciences National Laboratory (LNBio), Materials and Energy Research Center, Campinas, SP, Brazil
| | - H M Passos
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil
| | - D A Silva
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil
| | - A Balan
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil.,Biosciences National Laboratory (LNBio), Materials and Energy Research Center, Campinas, SP, Brazil
| | - L C S Ferreira
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil
| | - R C C Ferreira
- Department of Microbiology, Biomedical Science Institute, University of São Paulo, São Paulo, Brazil
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Guevara CP, Luiz WB, Sierra A, Cruz C, Qadri F, Kaushik RS, Ferreira LCS, Gómez-Duarte OG. Enterotoxigenic Escherichia coli CS21 pilus contributes to adhesion to intestinal cells and to pathogenesis under in vivo conditions. Microbiology (Reading) 2013; 159:1725-1735. [PMID: 23760820 DOI: 10.1099/mic.0.065532-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Colonization surface antigens (CSs) represent key virulence-associated factors of enterotoxigenic Escherichia coli (ETEC) strains. They are required for gut colonization, the first step of the diarrhoeal disease process induced by these bacteria. One of the most prevalent CSs is CS21, or longus, a type IV pili associated with bacterial self-aggregation, protection against environmental stresses, biofilm formation and adherence to epithelial cell lines. The objectives of this study were to assess the role of CS21 in adherence to primary intestinal epithelial cells and to determine if CS21 contributes to the pathogenesis of ETEC infection in vivo. We evaluated adherence of a CS21-expressing wild-type ETEC strain and an isogenic CS21-mutant strain to pig-derived intestinal cell lines. To determine the role of CS21 in pathogenesis we used the above ETEC strains in a neonatal mice challenge infection model to assess mortality. Quantitative adherence assays confirmed that ETEC adheres to primary intestinal epithelial cells lines in a CS21-dependent manner. In addition, the CS21-mediated ETEC adherence to cells was specific as purified LngA protein, the CS21 major subunit, competed for binding with the CS21-expressing ETEC while specific anti-LngA antibodies blocked adhesion to intestinal cells. Neonatal DBA/2 mice died after intra-stomach administration of CS21-expressing strains while lack of CS21 expression drastically reduced the virulence of the wild-type ETEC strain in this animal model. Collectively these results further support the role of CS21 during ETEC infection and add new evidence on its in vivo relevance in pathogenesis.
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Affiliation(s)
- C P Guevara
- Department of Pediatrics, University of Iowa College of Medicine, Iowa City, IA, USA
| | - W B Luiz
- Department of Microbiology, Biomedical Sciences Institute, University of São Paulo, 05508-000 São Paulo, Brazil
| | - A Sierra
- Internal Medicine, University of Iowa College of Medicine, Iowa City, IA, USA
| | - C Cruz
- Department of Pediatrics, University of Iowa College of Medicine, Iowa City, IA, USA
| | - F Qadri
- International Centre for Diarrheal Disease Research, Bangladesh (ICDDR,B), Dhaka, Bangladesh
| | - R S Kaushik
- Departments of Biology and Microbiology, and Veterinary and Biomedical Sciences, South Dakota State University, Brookings, SD, USA
| | - L C S Ferreira
- Department of Microbiology, Biomedical Sciences Institute, University of São Paulo, 05508-000 São Paulo, Brazil
| | - O G Gómez-Duarte
- Department of Pediatrics, University of Iowa College of Medicine, Iowa City, IA, USA
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Oliveira BH, Silva MR, Braga CJM, Massis LM, Ferreira LCS, Sbrogio-Almeida ME, Takagi M. Production of native flagellin from Salmonella Typhimurium in a bioreactor and purification by tangential ultrafiltration. Braz J Chem Eng 2011. [DOI: 10.1590/s0104-66322011000400003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gomes PADP, Bentancor LV, Paccez JD, Sbrogio-Almeida ME, Palermo MS, Ferreira RCC, Ferreira LCS. Antibody responses elicited in mice immunized with Bacillus subtilis vaccine strains expressing Stx2B subunit of enterohaemorragic Escherichia coli O157:H7. Braz J Microbiol 2009; 40:333-8. [PMID: 24031368 PMCID: PMC3769720 DOI: 10.1590/s1517-838220090002000023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Revised: 08/07/2008] [Accepted: 03/03/2009] [Indexed: 11/21/2022] Open
Abstract
No effective vaccine or immunotherapy is presently available for patients with the hemolytic uremic syndrome (HUS) induced by Shiga-like toxin (Stx) produced by enterohaemorragic Escherichia coli (EHEC) strains, such as those belonging to the O157:H7 serotype. In this work we evaluated the performance of Bacillus subtilis strains, a harmless spore former gram-positive bacterium species, as a vaccine vehicle for the expression of Stx2B subunit (Stx2B). A recombinant B. subtilis vaccine strain expressing Stx2B under the control of a stress inducible promoter was delivered to BALB/c mice via oral, nasal or subcutaneous routes using both vegetative cells and spores. Mice immunized with vegetative cells by the oral route developed low but specific anti-Stx2B serum IgG and fecal IgA responses while mice immunized with recombinant spores developed anti-Stx2B responses only after administration via the parenteral route. Nonetheless, serum anti-Stx2B antibodies raised in mice immunized with the recombinant B. subtilis strain did not inhibit the toxic effects of the native toxin, both under in vitro and in vivo conditions, suggesting that either the quantity or the quality of the induced immune response did not support an effective neutralization of Stx2 produced by EHEC strains.
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Affiliation(s)
- P A D P Gomes
- Universidade de São Paulo, Departamento de Microbiologia , São Paulo, SP , Brasil
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5
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Souza CS, Ferreira LCS, Thomas L, Barbosa JARG, Balan A. Crystallization, data collection and data processing of maltose-binding protein (MalE) from the phytopathogen Xanthomonas axonopodis pv. citri. Acta Crystallogr Sect F Struct Biol Cryst Commun 2009; 65:105-7. [PMID: 19193996 PMCID: PMC2635876 DOI: 10.1107/s1744309108041833] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2008] [Accepted: 12/09/2008] [Indexed: 05/27/2023]
Abstract
Maltose-binding protein is the periplasmic component of the ABC transporter responsible for the uptake of maltose/maltodextrins. The Xanthomonas axonopodis pv. citri maltose-binding protein MalE has been crystallized at 293 K using the hanging-drop vapour-diffusion method. The crystal belonged to the primitive hexagonal space group P6(1)22, with unit-cell parameters a = 123.59, b = 123.59, c = 304.20 A, and contained two molecules in the asymetric unit. It diffracted to 2.24 A resolution.
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Affiliation(s)
- C. S. Souza
- Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, São Paulo, SP, Brazil
| | - L. C. S. Ferreira
- Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, São Paulo, SP, Brazil
| | - L. Thomas
- Howard Hughes Medical Institute, Division of Biology, California Institute of Technology, 1200 East California Boulevard, Pasadena, California, USA
| | - J. A. R. G. Barbosa
- Center for Structural Molecular Biology (CeBiMe), Brazilian Synchrotron Light Laboratory (LNLS), CP 6192, Campinas, SP 13084-971, Brazil
| | - A. Balan
- Center for Structural Molecular Biology (CeBiMe), Brazilian Synchrotron Light Laboratory (LNLS), CP 6192, Campinas, SP 13084-971, Brazil
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Massis LM, Braga CJM, Sbrogio-Almeida ME, Lauand C, Newton SMC, Klebba PE, Ferreira LCS. Anti-flagellin antibody responses elicited in mice orally immunized with attenuated Salmonella enterica serovar Typhimurium vaccine strains. Mem Inst Oswaldo Cruz 2008; 103:606-10. [DOI: 10.1590/s0074-02762008000600017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2008] [Accepted: 08/22/2008] [Indexed: 11/22/2022] Open
Affiliation(s)
| | | | | | - C Lauand
- Universidade de São Paulo, Brasil
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Balan A, Ferreira RCC, Ferreira LCS. Production of the refolded oligopeptide-binding protein (OppA) encoded by the citrus pathogen Xanthomonas axonopodis pv. Citri. Genet Mol Res 2008; 7:117-26. [PMID: 18273827 DOI: 10.4238/vol7-1gmr392] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The oligopeptide-binding protein, OppA, binds and ushers oligopeptide substrates to the membrane-associated oligopeptide permease (Opp), a multi-component ABC-type transporter involved in the uptake of oligopeptides expressed by several bacterial species. In the present study, we report the cloning, purification, refolding and conformational analysis of a recombinant OppA protein derived from Xanthomonas axonopodis pv. citri (X. citri), the etiological agent of citrus canker. The oppA gene was expressed in Escherichia coli BL21 (DE3) strain under optimized inducing conditions and the recombinant protein remained largely insoluble. Solubilization was achieved following refolding of the denatured protein. Circular dichroism analysis indicated that the recombinant OppA protein preserved conformational features of orthologs expressed by other bacterial species. The refolded recombinant OppA represents a useful tool for structural and functional analyses of the X. citri protein.
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Affiliation(s)
- A Balan
- Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, São Paulo, SP, Brasil.
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Moutran A, Balan A, Ferreira LCS, Giorgetti A, Tramontano A, Ferreira RCC. Structural model and ligand interactions of the Xanthomonas axonopodis pv. citri oligopeptide-binding protein. Genet Mol Res 2007; 6:1169-1177. [PMID: 18273810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The oligopeptide-binding protein, OppA, ushers oligopeptide substrates to the membrane-associated oligopeptide permease (Opp), a multi-component ABC-type transporter involved in the uptake of oligopeptides by several bacterial species. In the present study, we report a structural model and an oligopeptide docking analysis of the OppA protein expressed by Xanthomonas axonopodis pv. citri (X. citri), the etiological agent of citrus canker. The X. citri OppA structural model showed a conserved three-dimensional structure, irrespective of the low amino acid identities with previously defined structures of Bacillus subtilis and Salmonella typhimurium orthologs. Oligopeptide docking analysis carried out with the proposed model indicated that the X. citri OppA preferentially binds tri- and tetrapeptides. The present study represents the first structural analysis of an OppA ortholog expressed by a phytopathogen and contributes to the understanding of the physiology and nutritional strategies of X. citri.
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Affiliation(s)
- A Moutran
- Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, Cidade Universitária, São Paulo, SP, Brasil
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Nepomuceno RSL, Tavares MB, Lemos JA, Griswold AR, Ribeiro JL, Balan A, Guimarães KS, Cai S, Burne RA, Ferreira LCS, Ferreira RCC. The oligopeptide (opp) gene cluster of Streptococcus mutans: identification, prevalence, and characterization. ACTA ACUST UNITED AC 2007; 22:277-84. [PMID: 17600541 DOI: 10.1111/j.1399-302x.2007.00368.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION The Opp system is an ATP-binding cassette-type transporter formed by membrane-associated proteins required for the uptake of oligopeptides in bacteria. In gram-positive bacteria, the Opp system, and particularly the oligopeptide-binding protein (OppA), has been shown to be involved in different aspects of cell physiology, including intercellular communication and binding to host proteins. METHODS In the present study we began to investigate the Opp system of Streptococcus mutans, the main etiological agent of dental caries. RESULTS Five opp genes (oppABCDF) organized in a single operon were identified in the genome of the S. mutans UA159 strain. Amino acid sequence analyses showed that the S. mutans OppA is closely related to an ortholog found in Streptococcus agalactiae. Incubation of S. mutans UA159 cells with an anti-OppA-specific serum did not inhibit biofilm formation on polystyrene plates. Moreover, S. mutans UA159 derivatives carrying deletions on the oppA or oppB genes did not show significant growth impairment, increased sensitivity to aminopterin, or defective capacity to form biofilms on polystyrene wells in the presence or not of saliva. Remarkably, only two out of three laboratory strains and one out of seven clinical strains recovered from tooth decay processes harbored a copy of the oppA gene and expressed the OppA protein. CONCLUSION Collectively, these results indicate that, in contrast to other Streptococcus species, the S. mutans Opp system, and particularly the OppA protein, does not represent an important trait required for growth and colonization.
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Affiliation(s)
- R S L Nepomuceno
- Department of Microbiology, Biomedical Sciences Institute, University of São Paulo, Cidade Universitária, SP, Brazil
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Esbérard CEL, Motta AG, Almeida JC, Ferreira LCS, Costa LM. Reproduction of Chrotopterus auritus (Peters) in captivity (Chiroptera, Phyllostomidae). BRAZ J BIOL 2006; 66:955-6. [PMID: 17119844 DOI: 10.1590/s1519-69842006000500022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Affiliation(s)
- C E L Esbérard
- Departamento de Ecologia, IBRAG, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brasil.
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Santacruz CP, Balan A, Ferreira LCS, Barbosa JARG. Crystallization, data collection and phasing of the molybdate-binding protein of the phytopathogen Xanthomonas axonopodis pv. citri. Acta Crystallogr Sect F Struct Biol Cryst Commun 2006; 62:289-91. [PMID: 16511325 PMCID: PMC2197186 DOI: 10.1107/s1744309106003812] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2005] [Accepted: 01/31/2006] [Indexed: 11/10/2022]
Abstract
Xanthomonas axonopodis pv. citri ModA protein is the ABC periplasmic binding component responsible for the capture of molybdate. The protein was crystallized with sodium molybdate using the hanging-drop vapour-diffusion method in the presence of PEG or sulfate. X-ray diffraction data were collected to a maximum resolution of 1.7 A using synchrotron radiation. The crystal belongs to the orthorhombic space group C222(1), with unit-cell parameters a = 68.15, b = 172.14, c = 112.04 A. The crystal structure was solved by molecular-replacement methods and structure refinement is in progress.
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Affiliation(s)
- C. P. Santacruz
- Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, São Paulo, SP, Brazil
| | - A. Balan
- Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, São Paulo, SP, Brazil
| | - L. C. S. Ferreira
- Departamento de Microbiologia, Instituto de Ciências Biomédicas II, Universidade de São Paulo, São Paulo, SP, Brazil
| | - J. A. R. G. Barbosa
- Centro de Biologia Molecular e Estrutural (CeBiMe), Laboratório Nacional de Luz Síncrotron (LNLS), CP 6192, Campinas, SP 13084-971, Brazil
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Perez CS, Balan A, Ferreira LCS, Guimaraes BG, Medrano JF, Barbosa JA. Crystallization of molybdate-binding protein of Xanthomonas Citri. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305097825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Balan A, Souza CS, Ferreira LCS, Guimaraes BG, Medrano JF, Barbosa JA. Crystallization and data collection of Xanthomonas citrimaltose-binding protein. Acta Crystallogr A 2005. [DOI: 10.1107/s010876730509255x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Moutran A, Balan A, Perez CS, Ferreira LCS, Ferreira RCC, Neshich G. Homology modeling of Xanthomonas Citrimolybdate-binding protein. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305092834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Lasaro MO, Luiz WB, Sbrogio-Almeida ME, Ferreira LCS. Prime-boost vaccine regimen confers protective immunity to human-derived enterotoxigenic Escherichia coli. Vaccine 2005; 23:2430-8. [PMID: 15752829 DOI: 10.1016/j.vaccine.2004.11.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2004] [Accepted: 11/01/2004] [Indexed: 11/26/2022]
Abstract
Development of effective vaccines against diarrhea caused by enterotoxigenic Escherichia coli (ETEC) strains is still a priority for those living at or traveling to endemic regions. In this work, we evaluated the protective role of an anti-ETEC vaccine regimen based on parenteral priming with a DNA vaccine, pRECFA, followed by oral boosting with a recombinant attenuated Salmonella Typhimurium vaccine strain, HG3, both encoding the same antigen, the structural subunit (CfaB) of the ETEC CFA/I fimbriae. The DNA-priming Salmonella-boosting protocol enhanced both murine anti-CfaB serum IgG and fecal IgA antibody responses and increased the ability of serum antibodies to inhibit the adhesive properties of the CFA/I fimbriae expressed by live bacteria, as compared to mice immunized with only one vaccine type. Addition of a mucosal adjuvant (LTR192G) to the Salmonella vaccine strain further enhanced the synergic effects of the vaccine regimen on the induced CfaB-specific antibody responses. DBA/2 dams submitted to the prime-boost regimen transferred complete passive protection to suckling neonates challenged with a virulent ETEC strain. Detection of milk anti-CfaB IgA antibodies and protection conferred by vaccinated dams to neonates born from non-vaccinated dams indicated that secretion of antigen-specific IgA is the immune response induced by the protective vaccine regimen. These results demonstrate that priming with a DNA vaccine and boosting with a Salmonella strain enhances both quantitatively and qualitatively the antibody responses to the CfaB antigen and represents an alternative for either active or passive immunization approach to ETEC-associated diarrhea.
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Affiliation(s)
- M O Lasaro
- Microbiology Department, Biomedical Science Institute, University of São Paulo, Av Prof. Lineu Prestes 1374, São Paulo 05508-000, Brazil
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16
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Sbrogio-Almeida ME, Mosca T, Massis LM, Abrahamsohn IA, Ferreira LCS. Host and bacterial factors affecting induction of immune responses to flagellin expressed by attenuated Salmonella vaccine strains. Infect Immun 2004; 72:2546-55. [PMID: 15102762 PMCID: PMC387842 DOI: 10.1128/iai.72.5.2546-2555.2004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2003] [Revised: 09/03/2003] [Accepted: 02/04/2004] [Indexed: 11/20/2022] Open
Abstract
Previous observations demonstrated that the delivery of recombinant Salmonella enterica serovar Dublin strains to mice via mucosal routes did not efficiently activate systemic and secreted antibody responses to either type d flagellin or genetically fused heterologous B-cell epitopes, thus reducing the usefulness of the protein as a carrier of epitopes for vaccine purposes. In this work, we investigated murine systemic and mucosal flagellin immunogenicity after oral immunization with attenuated Salmonella strains. The reduced anti-type d flagellin antibody responses in mice immunized via mucosal routes with three doses of flagellated S. enterica serovar Dublin strains were not caused by oral tolerance and could not be restored by coadministration of a mucosal adjuvant. The induction of antibody responses to Salmonella flagellins was shown to differ according to the genetic background, but not the haplotype, of the mouse lineage. Moreover, BALB/c mice orally immunized with S. enterica serovar Typhimurium strains developed anti-type i flagellin sera and secreted antibody responses, which indicated that the serovar of the Salmonella vaccine strain also affected flagellin immunogenicity. Analyses of cytokine responses of BALB/c mice immunized with three oral doses of flagellated S. enterica serovar Dublin vaccine strains showed that, in spite of the lack of antibody responses, elevated type d flagellin-specific CD4-cell-activation-dependent gamma interferon (IFN-gamma) and interleukin-10 responses were elicited after the administration of the vaccine strains via either parenteral or mucosal routes. Similar cytokine production patterns were detected to a T-cell heterologous epitope, derived from the CFA/I fimbriae of enterotoxigenic Escherichia coli (ETEC), in mice orally immunized with a Salmonella vaccine strain expressing hybrid flagella. These results indicate that the immunogenicities of Salmonella flagellins can differ significantly, depending on the murine host and on the bacterial vector used, and demonstrate that the induction of CD4-cell-activation-dependent IFN-gamma production represents a major immune response triggered by flagellin and in-frame fused heterologous T-cell epitopes after the oral administration of recombinant S. enterica serovar Dublin vaccine strains.
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Affiliation(s)
- M E Sbrogio-Almeida
- Division of Technological Development and Production, Butantan Institute, São Paulo University, São Paulo, Brazil
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17
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Acosta MBR, Ferreira RCC, Padilla G, Ferreira LCS, Costa SOP. Altered expression of oligopeptide-binding protein (OppA) and aminoglycoside resistance in laboratory and clinical Escherichia coli strains. J Med Microbiol 2000; 49:409-413. [PMID: 10798552 DOI: 10.1099/0022-1317-49-5-409] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Oligopeptide-binding protein (OppA) is the periplasmic component of the major oligopeptide transport system of enteric bacteria. Genetic and biochemical evidence suggests that OppA plays a role in the uptake of aminoglycoside antibiotics in Escherichia coli K-12. Forty-six (82%) of 56 aminoglycoside-resistant mutants of E. coli K-12 selected in vitro had reduced or undetectable OppA levels, as compared with their parent strain. Moreover, nine (36%) of 25 aminoglycoside-resistant clinical isolates of E. coli expressed reduced or undetectable levels of OppA. No decrease in OppA expression was observed among aminoglycoside-sensitive E. coli strains from patients. Twenty-three (42%) of 56 aminoglycoside-resistant mutants of E. coli K-12 and six (24%) of 25 clinical isolates also were deficient for expression of ornithine or arginine decarboxylases, or both, and these deficiencies might negatively affect OppA expression by reducing polyamine synthesis. These results support the view that reduced OppA expression is associated with aminoglycoside resistance in E. coli strains.
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Affiliation(s)
| | | | | | - L C S Ferreira
- Laboratório de Genética de Microrganismos, Departamento de Microbiologia, ICB, Universidade de São Paulo, São Paulo, 05508-900, SP and *Laboratório de Fisiologia Celular, Instituto de Biofísica Carlos Chagas Filho, CCS, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21949-900, RJ, Brazil
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