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Related Experiment Videos

Type I interferons keep activated T cells alive

P Marrack1, J Kappler, T Mitchell

  • 1Howard Hughes Medical Institute, Department of Medicine, National Jewish Medical and Research Center, Denver, Colorado 80206, USA. marrackp@njc.org

The Journal of Experimental Medicine
|February 2, 1999
PubMed
Summary
This summary is machine-generated.

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Inflammation prevents antigen-specific T cell death during immune responses. Interferons (IFNs) alpha and beta directly inhibit this rapid T cell death, a novel finding with implications for infection control.

Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • Antigen administration triggers T cell activation followed by rapid cell death.
  • Inflammation counteracts this antigen-induced T cell death.
  • The precise mechanisms by which inflammation inhibits T cell death remain incompletely understood.

Purpose of the Study:

  • To investigate the role of various cytokines in modulating the rapid death of activated T cells.
  • To identify specific inflammatory mediators that prevent antigen-induced T cell apoptosis.
  • To elucidate the molecular pathways involved in T cell survival during inflammatory conditions.

Main Methods:

  • T cells were activated in vivo following antigen injection.
  • Activated T cells were isolated and cultured in vitro.

Related Experiment Videos

  • The effects of different cytokines, including interleukins and interferons (IFNs), on T cell survival were assessed.

    • Main Results:

    • Members of the interleukin 2 family and interferons (IFNs) alpha/beta significantly inhibited the rapid death of activated T cells.
    • This protective effect of IFN-alpha/beta was a direct action on T cells, independent of other cytokines like interleukin 15.
    • IFN-alpha/beta's mechanism differed from IFN-gamma, as it did not solely rely on Stat 1 activation and did not increase Bcl-2 or Bcl-XL levels.

    Conclusions:

    • Interferons (IFNs) alpha and beta possess a previously undescribed ability to prevent rapid T cell death.
    • These findings suggest that IFN-alpha/beta are key mediators of inflammation-induced T cell survival.
    • IFN-alpha/beta may represent crucial signals employed by the immune system to sustain T cell populations during infections.