Immunogenicity and protective results of DNA vaccine V569 against latent tuberculosis infection in animal models

SU Haibo, LIU Zijian, ZHOU Yangyang, PENG Baozhou, GONG Qing

Journal of Microbes and Infections ›› 2019, Vol. 14 ›› Issue (5) : 289-296.

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Journal of Microbes and Infections ›› 2019, Vol. 14 ›› Issue (5) : 289-296. DOI: 10.3969/j.issn.1673-6184.2019.05.005
Original Article

Immunogenicity and protective results of DNA vaccine V569 against latent tuberculosis infection in animal models

  • SU Haibo, LIU Zijian, ZHOU Yangyang, PENG Baozhou, GONG Qing
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Abstract

We constructed the DNA vaccine Ag85B-Rv3425 -Rv2029c-PPE26 (V569) plasmid based on p-VAX1-Ag85B-Rv3425-Rv2029c (A39) and evaluated its immunogenicity in mice. The levels of cellular immunity and humoral immunity against PBS, BCG, p-VAX1-Ag85B (A), p-VAX1-Ag85B-Rv3425 (A3), A39 and V569 were detected by enzyme-linked immunosorbent assay (ELISA) and flow cytometry after vaccination in mice. We found that V569 could trigger stronger Th1 immune response by augmenting the secretion of IFN-γ and significantly improve the CD4/CD8 T cell ratio in immunized mice compared to BCG. In addition, we evaluated the V569 as post-exposure DNA vaccine and found that it reduced bacterial burdens upon reactivation compared to BCG. The protection of V569 against latent TB infection was determined by zebrafish-Mycobacterium marinum latent infection model. In conclusion, V569 DNA vaccine may be a potential candidate DNA vaccine against latent tuberculosis infection.

Key words

PPE26 / Latent tuberculosis infection / DNA vaccine / Rv3425 / Th1 type cellular immune response

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SU Haibo, LIU Zijian, ZHOU Yangyang, PENG Baozhou, GONG Qing. Immunogenicity and protective results of DNA vaccine V569 against latent tuberculosis infection in animal models[J]. Journal of Microbes and Infections. 2019, 14(5): 289-296 https://doi.org/10.3969/j.issn.1673-6184.2019.05.005
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