Identification of mycobacterial HSP70 reactive human T cell clones discriminating between M. tuberculosis and M.

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F Oftung1, K E Lundin

  • 1Department of Vaccinology, National Institute of Public Health, Oslo, Norway. oftung@sn.no

FEMS Immunology and Medical Microbiology
|April 17, 1998
PubMed

Insights

Researchers identified specific CD4+ T cell responses to mycobacterial heat shock proteins (HSPs). These T cell clones could distinguish between Mycobacterium tuberculosis and Mycobacterium leprae, offering insights into immune responses to tuberculosis and leprosy.

Area of Science:

  • Immunology
  • Microbiology
  • Tuberculosis Research

Background:

  • Mycobacterium tuberculosis (M. tuberculosis) infection triggers complex immune responses.
  • Heat shock proteins (HSPs) are conserved antigens in mycobacteria, implicated in immune modulation.
  • Understanding T cell specificity is crucial for developing effective vaccines and diagnostics.

Purpose of the Study:

  • To establish and characterize CD4+ T cell clones reactive to mycobacterial antigens.
  • To identify T cell specificities directed against M. tuberculosis HSP70 and HSP65.
  • To investigate the discriminatory capacity of these T cell responses between M. tuberculosis and M. leprae.

Main Methods:

  • Generation of CD4+ T cell clones from a BCG-vaccinated donor.
  • Proliferative assays using M. tuberculosis, M. leprae, PPD, and recombinant HSP70/HSP65 antigens.
  • HLA typing and antibody blocking experiments to determine antigen presentation restriction.

Main Results:

  • Identification of T cell clones specifically recognizing mycobacterial HSP70 and HSP65.
  • HSP65-reactive T cell clones showed cross-reactivity to both M. tuberculosis and M. leprae.
  • Three HSP70-reactive T cell clones recognized only M. tuberculosis, demonstrating specificity.
  • Antigen presentation to M. tuberculosis-reactive T cell clones was restricted by HLA-DR3 molecules.

Conclusions:

  • Human T cell specificities directed against M. tuberculosis HSP70 exist.
  • These HSP70-specific T cell responses can differentiate between M. tuberculosis and M. leprae.
  • Findings highlight the potential of mycobacterial HSPs as targets for specific immune responses.

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