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Related Experiment Videos

Increased autoreactive T cell frequency in tuberculous patients.

F Del Gallo1, G Lombardi, E Piccolella

  • 1Department of Cellular and Developmental Biology, University of Rome, La Sapienza, Italy.

International Archives of Allergy and Applied Immunology
|January 1, 1990
PubMed
Summary

Mycobacterium tuberculosis infection and purified protein derivative (PPD) stimulation significantly increase self-major histocompatibility complex (MHC)-reactive T cells. These autoreactive T cells recognize self-MHC class II, release interferon-gamma without antigen, and exhibit autocytotoxicity, suggesting a role in tuberculosis inflammation.

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Area of Science:

  • Immunology
  • Microbiology
  • Tuberculosis Research

Background:

  • Self-major histocompatibility complex (MHC)-reactive T cells play a role in immune responses.
  • The generation and function of autoreactive T cells in the context of Mycobacterium tuberculosis infection are not fully understood.

Purpose of the Study:

  • To investigate the development and frequency of self-MHC-reactive T cells.
  • To analyze the role of foreign antigen exposure in generating self-MHC-reactive T cells in vivo.
  • To characterize the functional properties of autoreactive T cell clones derived from tuberculous patients.

Main Methods:

  • Peripheral blood lymphocyte cultures stimulated in vitro with purified protein derivative (PPD).
  • Comparison of autoreactive T cell frequency in tuberculous patients versus healthy individuals.

Related Experiment Videos

  • Characterization of autoreactive T cell clones for MHC recognition, cytokine release, and autocytotoxicity.

    • Main Results:

    • Both in vitro PPD stimulation and in vivo Mycobacterium tuberculosis infection substantially increased the generation of autoreactive T cells.
    • Autoreactive T cell clones recognized self-MHC class II products.
    • These clones released gamma interferon spontaneously and exhibited autocytotoxic activity.

    Conclusions:

    • Self-MHC-reactive T cells are generated in response to Mycobacterium tuberculosis.
    • Autoreactive T cells possess specific functional characteristics including self-MHC class II recognition and cytokine production.
    • These findings suggest a potential role for self-MHC-reactive T cells in the inflammatory response to tuberculosis.