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Vaccine-Specific Immune Responses against Mycobacterium ulcerans Infection in a Low-Dose Murine Challenge Model

Abstract : The neglected tropical disease Buruli ulcer (BU) is an infection of subcu-taneous tissue with Mycobacterium ulcerans. There is no effective vaccine. Here, we assessed an experimental prime-boost vaccine in a low-dose murine tail infection model. We used the enoyl reductase (ER) domain of the M. ulcerans mycolactone polyketide synthases electrostatically coupled with a previously described Toll-like receptor 2 (TLR-2) agonist-based lipopeptide adjuvant, R 4 Pam 2 Cys. Mice were vaccinated and then challenged via tail inoculation with 14 to 20 CFU of a biolumines-cent strain of M. ulcerans. Mice receiving either the experimental ER vaccine or My-cobacterium bovis bacillus Calmette-Guérin (BCG) were equally protected, with both groups faring significantly better than nonvaccinated animals (P Ͻ 0.05). To explore potential correlates of protection, a suite of 29 immune parameters were assessed in the mice at the end of the experimental period. Multivariate statistical approaches were used to interrogate the immune response data to develop disease-prognostic models. High levels of interleukin 2 (IL-2) and low gamma interferon (IFN-␥) produced in the spleen best predicted control of infection across all vaccine groups. Univariate logistic regression revealed vaccine-specific profiles of protection. High ti-ters of ER-specific IgG serum antibodies together with IL-2 and IL-4 in the draining lymph node (DLN) were associated with protection induced by the ER vaccine. In contrast, high titers of IL-6, tumor necrosis factor alpha (TNF-␣), IFN-␥, and IL-10 in the DLN and low IFN-␥ titers in the spleen were associated with protection following BCG vaccination. This study suggests that an effective BU vaccine must induce localized, tissue-specific immune profiles with controlled inflammatory responses at the site of infection.
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Submitted on : Wednesday, April 22, 2020 - 10:11:50 AM
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Kirstie Mangas, Andrew Buultjens, Jessica Porter, Sarah Baines, Estelle Marion, et al.. Vaccine-Specific Immune Responses against Mycobacterium ulcerans Infection in a Low-Dose Murine Challenge Model. Infection and Immunity, American Society for Microbiology, 2020, 88 (3), pp.e00753-19. ⟨10.1128/IAI.00753-19⟩. ⟨inserm-02550333⟩

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