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  • Title: Outbreaks of mycobacterium tuberculosis MDR strains induce high IL-17 T-cell response in patients with MDR tuberculosis that is closely associated with high antigen load.
    Author: Basile JI, Geffner LJ, Romero MM, Balboa L, Sabio Y García C, Ritacco V, García A, Cuffré M, Abbate E, López B, Barrera L, Ambroggi M, Alemán M, Sasiain MC, de la Barrera SS.
    Journal: J Infect Dis; 2011 Oct 01; 204(7):1054-64. PubMed ID: 21881121.
    Abstract:
    BACKGROUND: The proinflammatory cytokine interleukin 17 (IL-17) plays an important role in immune responses but it is also associated with tissue-damaging inflammation. So, we evaluated the ability of Mycobacterium tuberculosis clinical isolates to induce IL-17 in tuberculosis (TB) patients and in healthy human tuberculin reactors (PPD(+)HD). METHODS: IL-17, interferon γ (IFN-γ), and interleukin 23 (IL-23) receptor expression were evaluated ex vivo and cultured peripheral blood mononuclear cells from TB and PPD(+)HD stimulated with irradiated clinical isolates from multidrug resistant (MDR) outbreaks M (Haarlem family) and Ra (Latin American-Mediterranean family), as well as drug-susceptible isolates belonging to the same families and laboratory strain H37Rv for 48 hours in T-cell subsets by flow cytometry. RESULTS: We observed that: (1) MDR strains M and Ra are stronger IL-17 inducers than drug-susceptible Mtb strains of the Haarlem and Latin American-Mediterranean families, (2) MDR-TB patients show the highest IL-17 expression that is independent on the strain, (3) IL-17 expression is dependent on CD4(+) and CD8(+) T cells associates with persistently high antigen load. CONCLUSIONS: IL-17--producing T cells could play an immunopathological role in MDR-TB promoting severe tissue damage, which may be associated with the low effectiveness of the second-line drugs employed in the treatment.
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