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• W2077128866 abstract "Yersinia pestis is the etiological agent of pneumonic and bubonic plague. As the currently licensed vaccines for plague have their own limitations, there is a need for a rational and more effective form of a subunit vaccine to combat both forms of the disease. Newer methods of antigen delivery coupled with adjuvant offer an alternative approach toward a plague vaccine. In order to develop a new generation vaccine against plague, we chose an immunodominant, outer membrane capsular protein, F1 of Y. pestis. The immunogenicity of the peptide sequences, predicted to possess B (three sequences, B1, B2 and B3) and T (two sequences, T1 and T2) cell determinants, was studied in a murine model with different genetic backgrounds, using alhydrogel and liposomes as delivery vehicles. All the peptide sequences are immunogenic in all mouse strains and showed primary and secondary immune response. B2 peptide was found to be most immunogenic, followed by B1 and B3 peptides. Chimeras made between B and T structures proved highly immunogenic and the antibody levels are comparable with native F1 antigen, thereby proving that T1 and T2 are helper sequences. Interestingly, the liposome mode of immunization was found to be more immunogenic and generated higher affinity antibodies than the alum-based preparation. Immunization using a mixture of all the peptides further proved B2 to be immunodominant. The IgG isotype profile showed predominance of IgG1, IgG2b followed by IgG2a for all the formulations irrespective of mode of antigen delivery. Lymphocyte proliferation of spleen cells primed in vivo with peptides, B-T conjugates and F1 antigen followed by in vitro stimulation with these antigens in soluble (medium) and particulate (liposome) form, showed dose-dependent stimulation of T cells, while B-T constructs showed a higher stimulation index, comparable to F1 antigen. The liposome mode of antigen presentation showed higher lymphoproliferation of spleen cells. Of all the peptides tested, T1 and T2 sequences showed the highest stimulation indices. The pattern of cytokine levels was in the following order: interferon-gamma>interleukin-2>interleukin-4. In vivo protective studies of the B-T conjugates revealed that B1T1 and a mixture of conjugates showed a survival rate of 10 days. Thus, the study highlights the importance of B and T cell epitopes as peptide-based immunogens, being a serious alternative for plague vaccine." @default.
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• W2077128866 date "2003-10-01" @default.
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• W2077128866 title "Developing subunit immunogens using B and T cell epitopes and their constructs derived from the F1 antigen of<i>Yersinia pestis</i>using novel delivery vehicles" @default.
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• W2077128866 doi "https://doi.org/10.1016/s0928-8244(03)00170-6" @default.
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