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Related Experiment Videos

T cell anergy and costimulation.

Leonard J Appleman1, Vassiliki A Boussiotis

  • 1Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.

Immunological Reviews
|April 3, 2003
PubMed
Summary

T cell anergy, a state of antigen-specific unresponsiveness, occurs without costimulatory signals. Exogenous interleukin-2 (IL-2) can reverse this T lymphocyte unresponsiveness.

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Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • T lymphocytes are crucial for adaptive immunity, distinguishing self from non-self antigens.
  • Antigen-specific unresponsiveness, or T cell anergy, is a key regulatory mechanism in vivo.
  • Anergic T cells fail to proliferate or produce IL-2 upon stimulation but retain IL-2 receptors.

Purpose of the Study:

  • To review the molecular mechanisms underlying the induction and maintenance of T cell anergy.
  • To explore how costimulatory signals influence T cell activation versus anergy induction.

Main Methods:

  • Review of existing literature on T cell anergy and costimulation.
  • Discussion of molecular events in T cell anergy.
  • Analysis of the CD28-B7 interaction as a model for T cell activation.

Main Results:

  • T cell anergy can be induced by antigen exposure without costimulatory signals.
  • Costimulatory signals, like CD28-B7 interaction, promote T cell activation instead of anergy.
  • Exogenous IL-2 can break established T cell anergy.

Conclusions:

  • Understanding T cell anergy mechanisms is vital for immune regulation.
  • Costimulatory pathways are critical determinants of T cell fate: activation or anergy.
  • Targeting these pathways could offer therapeutic strategies for immune modulation.

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