alexa An IL-12 DNA vaccine co-expressing Yersinia pestis antigens protects against pneumonic plague.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Yamanaka H, Hoyt T, Bowen R, Yang X, Crist K,

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Abstract Pneumonic plague remains problematic in endemic areas, and because it can be readily transmitted and has high mortality, the development of efficacious vaccines is warranted. To test whether stimulation of cell-mediated immunity with IL-12 will improve protective immunity against plague, we constructed two IL-12 DNA vaccines using a bicistronic plasmid encoding the protective plague epitopes, capsular (F1) antigen and virulence antigen (V-Ag) as F1-V fusion protein and V-Ag only, respectively. When applied intramuscularly, antibody responses to F1- and V-Ag were detectable beginning at week 6 after 3 weekly doses, and F1-Ag protein boosts were required to induce elevated Ab responses. These Ab responses were supported by mixed Th cell responses, and the IL-12/V-Ag DNA vaccine showed greater cell-mediated immune bias than IL-12/F1-V DNA vaccine. Following pneumonic challenge, both IL-12 DNA vaccines showed similar efficacy despite differences in Th cells simulated. These results show that IL-12 can be used as a molecular adjuvant to enhance protective immunity against pneumonic plague.
This article was published in Vaccine and referenced in Journal of Vaccines & Vaccination

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