Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308

Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308

Brucella spp. are Gram-negative, facultative intracellular coccobacilli that cause one of the most frequently encountered zoonosis worldwide. Humans naturally acquire infection through consumption of contaminated dairy and meat products and through direct exposure to aborted animal tissues and flui...

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Main Authors: Dabral, Neha, Martha-Moreno-Lafont, Sriranganathan, Nammalwar, Vemulapalli, Ramesh
Format: Online
Language:English
Published: Public Library of Science 2014
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4166413/
id pubmed-4166413
recordtype oai_dc
spelling pubmed-41664132014-09-22 Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308 Dabral, Neha Martha-Moreno-Lafont, Sriranganathan, Nammalwar Vemulapalli, Ramesh Research Article Brucella spp. are Gram-negative, facultative intracellular coccobacilli that cause one of the most frequently encountered zoonosis worldwide. Humans naturally acquire infection through consumption of contaminated dairy and meat products and through direct exposure to aborted animal tissues and fluids. No vaccine against brucellosis is available for use in humans. In this study, we tested the ability of orally inoculated gamma-irradiated B. neotomae and B. abortus RB51 in a prime-boost immunization approach to induce antigen-specific humoral and cell mediated immunity and protection against challenge with virulent B. abortus 2308. Heterologous prime-boost vaccination with B. abortus RB51 and B. neotomae and homologous prime-boost vaccination of mice with B. neotomae led to the production of serum and mucosal antibodies specific to the smooth LPS. The elicited serum antibodies included the isotypes of IgM, IgG1, IgG2a, IgG2b and IgG3. All oral vaccination regimens induced antigen-specific CD4+ and CD8+ T cells capable of secreting IFN-γ and TNF-α. Upon intra-peritoneal challenge, mice vaccinated with B. neotomae showed the highest level of resistance against virulent B. abortus 2308 colonization in spleen and liver. Experiments with different doses of B. neotomae showed that all tested doses of 109, 1010 and 1011 CFU-equivalent conferred significant protection against the intra-peritoneal challenge. However, a dose of 1011 CFU-equivalent of B. neotomae was required for affording protection against intranasal challenge as shown by the reduced bacterial colonization in spleens and lungs. Taken together, these results demonstrate the feasibility of using gamma-irradiated B. neotomae as an effective and safe oral vaccine to induce protection against respiratory and systemic infections with virulent Brucella. Public Library of Science 2014-09-16 /pmc/articles/PMC4166413/ /pubmed/25225910 http://dx.doi.org/10.1371/journal.pone.0107180 Text en © 2014 Dabral et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
repository_type Open Access Journal
institution_category Foreign Institution
institution US National Center for Biotechnology Information
building NCBI PubMed
collection Online Access
language English
format Online
author Dabral, Neha
Martha-Moreno-Lafont,
Sriranganathan, Nammalwar
Vemulapalli, Ramesh
spellingShingle Dabral, Neha
Martha-Moreno-Lafont,
Sriranganathan, Nammalwar
Vemulapalli, Ramesh
Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308
author_facet Dabral, Neha
Martha-Moreno-Lafont,
Sriranganathan, Nammalwar
Vemulapalli, Ramesh
author_sort Dabral, Neha
title Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308
title_short Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308
title_full Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308
title_fullStr Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308
title_full_unstemmed Oral Immunization of Mice with Gamma-Irradiated Brucella neotomae Induces Protection against Intraperitoneal and Intranasal Challenge with Virulent B. abortus 2308
title_sort oral immunization of mice with gamma-irradiated brucella neotomae induces protection against intraperitoneal and intranasal challenge with virulent b. abortus 2308
description Brucella spp. are Gram-negative, facultative intracellular coccobacilli that cause one of the most frequently encountered zoonosis worldwide. Humans naturally acquire infection through consumption of contaminated dairy and meat products and through direct exposure to aborted animal tissues and fluids. No vaccine against brucellosis is available for use in humans. In this study, we tested the ability of orally inoculated gamma-irradiated B. neotomae and B. abortus RB51 in a prime-boost immunization approach to induce antigen-specific humoral and cell mediated immunity and protection against challenge with virulent B. abortus 2308. Heterologous prime-boost vaccination with B. abortus RB51 and B. neotomae and homologous prime-boost vaccination of mice with B. neotomae led to the production of serum and mucosal antibodies specific to the smooth LPS. The elicited serum antibodies included the isotypes of IgM, IgG1, IgG2a, IgG2b and IgG3. All oral vaccination regimens induced antigen-specific CD4+ and CD8+ T cells capable of secreting IFN-γ and TNF-α. Upon intra-peritoneal challenge, mice vaccinated with B. neotomae showed the highest level of resistance against virulent B. abortus 2308 colonization in spleen and liver. Experiments with different doses of B. neotomae showed that all tested doses of 109, 1010 and 1011 CFU-equivalent conferred significant protection against the intra-peritoneal challenge. However, a dose of 1011 CFU-equivalent of B. neotomae was required for affording protection against intranasal challenge as shown by the reduced bacterial colonization in spleens and lungs. Taken together, these results demonstrate the feasibility of using gamma-irradiated B. neotomae as an effective and safe oral vaccine to induce protection against respiratory and systemic infections with virulent Brucella.
publisher Public Library of Science
publishDate 2014
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4166413/
_version_ 1613134682554105856

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