Abstract
Active disease of tuberculosis (TB) can be developed decades later by either a relapse of the initial infection (endogenous reactivation) or by an entrance of the secondary infection (exogenous reinfection), since the current chemotherapy cannot lead to complete elimination of tuberculosis. Although the immunotherapeutic approaches in conjunction with conventional chemotherapy were tried to prevent TB growth via boosting the immune system, their therapeutic effects are still controversial. Here, we found that TB DNA vaccination completely blocked tuberculosis reactivation and significantly prevented from the secondary infection when chemotherapy was combined simultaneously. In particular, double-gene DNA vaccine composed of Ag85A and PstS-3 genes could reduce bacteria growth better than single-gene DNA vaccine after a secondary reinfection, indicating a correlation between the breadth of Th1 IFN-γ response and the efficacy of the protection from reinfection. Thus, we propose that multigene TB DNA immunotherapy including Ag85A and PstS-3 genes during the period of chemotherapy could benefit patients undergoing TB chemotherapy in prevention from exogenous reinfection as well as endogenous reactivation.
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Acknowledgements
This work was supported by the grants of National Research Lab Program of the National S&T Program from the Ministry of S&T (M1-0204-00-0146 and M10204000060-02J0000-05510) and the grants from Genexine Co., Ltd. and Daewoong Co., Ltd. We thank Jin-Won Youn for devoted helpful discussion.
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Ha, SJ., Jeon, BY., Youn, JI. et al. Protective effect of DNA vaccine during chemotherapy on reactivation and reinfection of Mycobacterium tuberculosis. Gene Ther 12, 634–638 (2005). https://doi.org/10.1038/sj.gt.3302465
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DOI: https://doi.org/10.1038/sj.gt.3302465
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