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T cells deficient in inositol 1,4,5-trisphosphate receptor are resistant to apoptosis

T Jayaraman1, A R Marks

  • 1Molecular Cardiology Program, Department of Medicine, College of Physicians and Surgeons of Columbia University, New York, New York 10032, USA.

Molecular and Cellular Biology
|June 1, 1997
PubMed

Insights

The type 1 inositol 1,4,5-trisphosphate receptor (IP3R1) is crucial for T-cell apoptosis. IP3R1-deficient T cells resist apoptosis, but this resistance is reversed by increasing intracellular calcium levels, highlighting IP3R1

Area of Science:

  • Cell Biology
  • Immunology
  • Calcium Signaling

Background:

  • The type 1 inositol 1,4,5-trisphosphate receptor (IP3R1) is a calcium release channel found on the endoplasmic reticulum.
  • T lymphocytes deficient in IP3R1 show impaired intracellular calcium release and T-cell receptor (TCR) signaling.

Purpose of the Study:

  • To investigate the role of IP3R1 in T-cell apoptosis.
  • To determine if IP3R1-mediated calcium release is essential for apoptosis induction.

Main Methods:

  • Utilized IP3R1-deficient T cells.
  • Assessed apoptosis induction via dexamethasone, TCR stimulation, ionizing radiation, and Fas.
  • Manipulated cytoplasmic calcium levels pharmacologically.
  • Conducted experiments in calcium-free media.

Main Results:

  • IP3R1-deficient T cells demonstrated resistance to apoptosis induced by various stimuli.
  • This resistance was reversed by increasing intracellular calcium.
  • TCR-mediated apoptosis could be induced independently of extracellular calcium influx.

Conclusions:

  • Intracellular calcium release through IP3R1 is a critical mediator of T-cell apoptosis.
  • IP3R1 plays a significant role in regulating programmed cell death in T lymphocytes.

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