2016, Number S2
Purification of Salmonella Typhimurium OmpD Porin Induces Long-Term High Levels of Antibodies: Implications on the Development of Vaccines against Non-Typhoid Salmonella
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ABSTRACTIn the present work, we report, for the first time, on the purification of the Salmonella Typhimurium OmpD porin. We assessed the integrity and purity of the protein and evaluated the immunogenicity of the protein and its ability to induce antibody without exogenous adjuvant. We observed that 10 μg OmpD induced high antibody levels of IgM and IgG, which were maintained for more than 260 days after immunization. Immunization with OmpD induced multiple IgG antibody isotypes including IgG1, IgG2a, IgG2b, and IgG3 subclasses. Furthermore, these antibodies were able to recognize and bind to the bacterial surface. Our results demonstrate the high immunogenicity of S. Typhimurium OmpD porin, which induces long-lasting antibodies which may be and important target of the immune response against Salmonella infection. In conclusion, we propose the OmpD porin could be used within novel subunit vaccine formulations that do not need additional adjuvant and that confer long lasting humoral immunity against Salmonella infections.
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