• Molecular immunology · Aug 2015

    Enhanced and durable protective immune responses induced by a cocktail of recombinant BCG strains expressing antigens of multistage of Mycobacterium tuberculosis.

    • Jinping Liang, Xindong Teng, Xuefeng Yuan, Ying Zhang, Chunwei Shi, Tingting Yue, Lei Zhou, Jianrong Li, and Xionglin Fan.
    • Department of Pathogen Biology, School of Basic Medicine, Huazhong University of Science & Technology, Wuhan 430030, PR China.
    • Mol. Immunol. 2015 Aug 1; 66 (2): 392-401.

    AbstractAlthough Bacillus Calmette-Guérin (BCG) vaccine confers protection from Mycobacterium tuberculosis infection in children, its immune protection gradually wanes over time, and consequently leads to an inability to prevent the reactivation of latent infection of M. tuberculosis. Therefore, improving BCG for better control of tuberculosis (TB) is urgently needed. We thus hypothesized that recombinant BCG overexpressing immunodominant antigens expressed at different growth stages of M. tuberculosis could provide a more comprehensive protection against primary and latent M. tuberculosis infection. Here, a novel cocktail of recombinant BCG (rBCG) strains, namely ABX, was produced by combining rBCG::85A, rBCG::85B, and rBCG::X, which overexpressed respective multistage antigens Ag85A, Ag85B, and HspX of M. tuberculosis. Our results showed that ABX was able to induce a stronger immune protection than individual rBCGs or BCG against primary TB infection in C57BL/6 mice. Mechanistically, the immune protection was attributed to stronger antigen-specific CD4(+) Th1 responses, higher numbers of IFN-γ(+) CD4(+) TEM and IL-2(+) CD8(+) TCM cells elicited by ABX. These findings thus provide a novel strategy for the improvement of BCG efficacy and potentially a promising prophylactic TB vaccine candidate, warranting further investigation.Copyright © 2015 Elsevier Ltd. All rights reserved.

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