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Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
09:18

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Activation-induced cell death

R C Budd1

  • 1Immunobiology Program, The University of Vermont College of Medicine, Given Medical Building, D-305 05405-0068, Burlington, VT, USA. rbodd@zoo.uvm.edu

Current Opinion in Immunology
|June 19, 2001
PubMed

Insights

Activation-induced T cell death involves caspases and Bcl-2 family proteins. These pathways regulate mitochondrial integrity and cellular protein degradation, leading to programmed cell death.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • T lymphocyte activation triggers programmed cell death pathways.
  • These pathways involve caspases, proteases that degrade cellular components.
  • Mitochondrial dysfunction and Bcl-2 family proteins play critical roles.

Purpose of the Study:

  • To elucidate the molecular mechanisms of activation-induced T cell death.
  • To highlight the roles of caspases and Bcl-2 family members in this process.

Main Methods:

  • The study reviews signaling pathways converging on caspases.
  • It examines caspase activation via death receptors and metabolic stress.
  • Mitochondrial integrity regulation by Bcl-2 family proteins is discussed.

Main Results:

  • Caspase activation leads to protein degradation and DNA fragmentation.
  • Mitochondrial dysfunction releases cytochrome c and Smac/DIABLO.
  • Downstream caspases like caspase-3 and BH3-only proteins are key players.

Conclusions:

  • Activation-induced T cell death is a complex process involving caspases and Bcl-2 family proteins.
  • These molecules are crucial regulators of T cell homeostasis and immune responses.

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