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Reactive oxygen species regulate activation-induced T cell apoptosis.

D A Hildeman1, T Mitchell, T K Teague

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

Immunity
|July 14, 1999
PubMed
Summary

Reactive oxygen species (ROS) cause activated T cell death through mitochondrial damage and DNA fragmentation. A superoxide dismutase mimetic (MnTBAP) protected these cells, indicating ROS role in T cell apoptosis.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Reactive oxygen species (ROS) are known to induce apoptosis in various cell types.
  • Understanding the role of ROS in T cell apoptosis is crucial for immune regulation.

Purpose of the Study:

  • To investigate the specific role of ROS in the apoptosis of activated T cells.
  • To elucidate the mechanisms by which ROS contribute to T cell death.

Main Methods:

  • T cells were activated in vivo and then cultured ex vivo.
  • Assessed cell death markers including mitochondrial transmembrane potential (Δψm) loss, caspase-dependent DNA fragmentation, and superoxide generation.
  • Utilized a superoxide dismutase mimetic, MnTBAP, to evaluate the protective effects against ROS-induced apoptosis.

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Main Results:

  • Activated T cells underwent apoptosis independently of Fas and TNF-alpha signaling pathways.
  • Apoptosis was characterized by rapid loss of Δψm, caspase-dependent DNA fragmentation, and significant superoxide generation.
  • Treatment with MnTBAP effectively prevented superoxide generation, DNA loss, Δψm reduction, and subsequent cell death.

Conclusions:

  • ROS play a significant role in regulating caspase activation and apoptosis in activated T cells.
  • Superoxide generation by ROS contributes to peripheral T cell deletion, highlighting a potential mechanism for immune homeostasis.