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Related Experiment Videos

Evidence for a superantigen in human tuberculosis

J D Ohmen1, P F Barnes, C L Grisso

  • 1Division of Dermatology, University of California, Los Angeles, School of Medicine 90024.

Immunity
|April 1, 1994
PubMed
Summary

Mycobacterium tuberculosis may contain a superantigen that drives T cell responses and contributes to tuberculosis immunopathology. This superantigen causes T cell expansion regardless of the T cell receptor

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Area of Science:

  • Immunology
  • Microbiology
  • Pathogenesis

Background:

  • T cells are crucial for tuberculosis resistance but also implicated in disease-related tissue damage.
  • Understanding T cell populations in tuberculosis immunopathogenesis is essential.

Purpose of the Study:

  • To investigate the T cell receptor (TCR) beta chain repertoire in patients with tuberculous pleuritis.
  • To explore the role of Mycobacterium tuberculosis in T cell activation and immunopathology.

Main Methods:

  • Polymerase chain reaction and flow cytometry were used to analyze TCR beta chain repertoire.
  • In vitro studies assessed T cell proliferation in response to M. tuberculosis in tuberculin-negative donors.

Main Results:

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  • Expansion of V beta 8+ T cells was observed at the disease site in some patients.
  • M. tuberculosis induced significant T cell proliferation, particularly V beta 8+ T cells, independent of the CDR3 region.
  • T cell stimulation was dependent on MHC class II and did not require antigen processing.

    • Conclusions:

    • Findings suggest the presence of a superantigen within M. tuberculosis.
    • This superantigen may contribute to tuberculosis immunopathology and adjuvant properties.