Double‐ and monofunctional CD4+ and CD8+ T‐cell responses to Mycobacterium tuberculosis DosR antigens and peptides in long‐term latently infected …

S Commandeur, MY Lin… - European journal of …, 2011 - Wiley Online Library
S Commandeur, MY Lin, KE van Meijgaarden, AH Friggen, KLMC Franken, JW Drijfhout…
European journal of immunology, 2011Wiley Online Library
More than 2 billion individuals are latently infected with Mycobacterium tuberculosis (Mtb).
Knowledge of the key Mtb antigens and responding T‐cell subsets mediating protection
against Mtb is critical for developing improved tuberculosis (TB) vaccines. We previously
reported that Mtb DosR‐regulon‐encoded antigens are recognized well by human T cells in
association with control of Mtb infection. The characteristics of the responding T‐cell
subsets, however, remained unidentified. We have therefore studied the cytokine production …
Abstract
More than 2 billion individuals are latently infected with Mycobacterium tuberculosis (Mtb). Knowledge of the key Mtb antigens and responding T‐cell subsets mediating protection against Mtb is critical for developing improved tuberculosis (TB) vaccines. We previously reported that Mtb DosR‐regulon‐encoded antigens are recognized well by human T cells in association with control of Mtb infection. The characteristics of the responding T‐cell subsets, however, remained unidentified. We have therefore studied the cytokine production and memory phenotypes of Mtb DosR‐regulon‐encoded antigen‐specific T cells from individuals who had been infected with Mtb decades ago, yet never developed TB (long‐term latent Mtb‐infected individuals). Using multi‐parameter flow cytometry and intracellular cytokine staining for IFN‐γ, TNF‐α and IL‐2, we found double and single cytokine‐producing CD4+ as well as CD8+ T cells to be the most prominent subsets, particularly IFN‐γ+ TNF‐α+ CD8+ T cells. The majority of these T cells comprised effector memory and effector T cells. Furthermore, CFSE labeling revealed strong CD4+ and CD8+ T‐cell proliferative responses induced by several “immunodominant” Mtb DosR antigens and their specific peptide epitopes. These findings demonstrate the prominent presence of double‐ and monofunctional CD4+ and CD8+ T‐cell responses in naturally protected individuals and support the possibility of designing Mtb DosR antigen‐based TB vaccines.
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