Different cytokine production and effector/memory dynamics of alpha beta+ or gamma delta+ T-cell subsets in the peripheral blood of patients with active pulmonary tuberculosis

Int J Immunopathol Pharmacol. 2003 Sep-Dec;16(3):247-52. doi: 10.1177/039463200301600310.

Abstract

Immunity to M.tuberculosis (MTB) infection consists of interactions between various T-cell subsets that control the infection and prevent further reactivation. We analysed the effector/memory T-cell dynamics and cytokines production in the peripheral blood of patients with pulmonary tuberculosis (TB). We observed that the frequency of CD4+ T-cell effectors was significantly increased during active TB, confirming a major role of this T-cell subset in TB immunity. Pre-terminally differentiated CD8+ T-lymphocytes were increased in the peripheral blood as well. In contrast, we observed a reduced number of effector mycobacteria-reactive gammadelta+ T-lymphocytes with a specific defects in reacting to mycobacterial nonpeptidic antigens, suggesting that this innate response is rapidly lost during TB infection. Nevertheless, the frequency of gammadelta+ T-cells effectors in TB patients was higher than the alphabeta+ T-cell response to peptide from MTB-ESAT-6 protein and quantitatively similar to PPD reactivity. Thus, alphabeta+ and gammadelta+ T-cell differentiation and function are differently triggered by active TB infection.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Cytokines / blood*
  • Female
  • Humans
  • Immunologic Memory*
  • Male
  • Middle Aged
  • Receptors, Antigen, T-Cell, alpha-beta / blood*
  • Receptors, Antigen, T-Cell, gamma-delta / blood*
  • T-Lymphocyte Subsets / immunology
  • T-Lymphocyte Subsets / metabolism*
  • Tuberculosis, Pulmonary / blood
  • Tuberculosis, Pulmonary / immunology*

Substances

  • Cytokines
  • Receptors, Antigen, T-Cell, alpha-beta
  • Receptors, Antigen, T-Cell, gamma-delta