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Mycobacterium tuberculosis-specific polyfunctional cytotoxic CD8+ T cells express CD69.

Li Li1, Binyan Yang1, Xianlan Zhang2

  • 1Institute of Immunology, Zhongshan School of Medicine, Key Laboratory of Tropical Disease Control Research of Ministry of Education, Sun Yat-sen University, Guangzhou 510080, PR China.

Tuberculosis (Edinburgh, Scotland)
|February 26, 2014
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Summary

CD69 marks Mycobacterium tuberculosis (Mtb)-specific CD8(+) T cells in pleural fluid. These activated cells are crucial for immune defense in tuberculous pleurisy patients, aiding migration and response to Mtb antigens.

Keywords:
CD69CD8(+) T cellsMycobacterium tuberculosisTuberculous pleurisy

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Area of Science:

  • Immunology
  • Tuberculosis Research

Background:

  • CD8(+) T cells are vital for combating Mycobacterium tuberculosis (Mtb).
  • Tuberculous pleurisy (TBP) involves Mtb infection in the pleural space.

Purpose of the Study:

  • To identify a reliable marker for Mtb-specific CD8(+) T cells in pleural fluid.
  • To characterize the phenotype and function of these cells in TBP patients.

Main Methods:

  • Analysis of CD8(+) T cells from pleural fluid cells (PFCs) and peripheral blood mononuclear cells (PBMCs) of TBP patients.
  • Flow cytometry to assess CD69, CD45RO, HLA-DR, CD45RA, CCR6, CCR7, CD62L, and CD107a/b expression.
  • Stimulation with culture filtrate protein of 10 kDa (CFP10) peptides to evaluate Mtb specificity (IFN-γ, TNF-α).

Main Results:

  • CD8(+) T cells in pleural fluid expressed higher CD69 than peripheral blood cells.
  • CD8(+)CD69(+) T cells exhibited an activated memory phenotype (CD45RO+, HLA-DR+, CD45RA-) and migratory potential (CCR6+, CCR7-, CD62L-).
  • CD8(+)CD69(+) T cells, but not CD8(+)CD69(-) T cells, responded to CFP10 peptides with cytokine production (IFN-γ, TNF-α), indicating Mtb specificity and polyfunctionality.

Conclusions:

  • CD69 is a valuable marker for identifying Mtb-specific CD8(+) T cells in the pleural fluid of TBP patients.
  • This marker allows for direct ex vivo assessment of the quantity and quality of Mtb-specific CD8(+) T cell responses in the pleural space.