A parenteral DNA vaccine protects against pneumonic plague.
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概要
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The chemokine, lymphotactin (LTN), was tested as a molecular adjuvant using bicistronic DNA vaccines encoding the protective Yersinia capsular (F1) antigen and virulence antigen (V-Ag) as a F1-V fusion protein. The LTN-encoding F1-V or V-Ag vaccines were given by the intranasal (i.n.) or intramuscular (i.m.) routes, and although serum IgG and mucosal IgA antibodies (Abs) were induced, F1-Ag boosts were required for robust anti-F1-Ag Abs. Optimal efficacy against pneumonic plague was obtained in mice i.m.-, not i.n.-immunized with these DNA vaccines. These vaccines stimulated elevated Ag-specific Ab-forming cells and mixed Th cell responses, with Th17 cells markedly enhanced by i.m. immunization. These results show that LTN can be used as a molecular adjuvant to enhance protective immunity against plague.
- 2010-04-19
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