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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
08:07

Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

Published on: July 26, 2019

Requirement of inositol 1,4,5-trisphosphate receptors for tumor-mediated lymphocyte apoptosis

Camia Steinmann1, Megan L Landsverk, José M Barral

  • 1Department of Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, Texas 77555-0620, USA.

The Journal of Biological Chemistry
|March 28, 2008
PubMed

Insights

Tumor cells evade immune attack by down-regulating Fas receptors and up-regulating Fas ligand. This study shows that blocking calcium release from inositol 1,4,5-trisphosphate receptors (IP3Rs) inhibits tumor-induced lymphocyte apoptosis, suggesting a therapeutic target.

Area of Science:

  • Immunology
  • Cell Biology
  • Cancer Research

Background:

  • Tumor cells evade immune surveillance by modulating Fas receptor and Fas ligand expression.
  • Apoptotic cell death pathways often involve calcium release mediated by inositol 1,4,5-trisphosphate receptors (IP3Rs).

Purpose of the Study:

  • To investigate the role of IP3R-mediated calcium release in Fas-dependent tumor cell-induced lymphocyte apoptosis.
  • To determine if targeting IP3R signaling can enhance anti-tumor immunity.

Main Methods:

  • Utilized Jurkat T lymphoma cells and SW620 colon cancer cells.
  • Assessed Fas-dependent apoptosis induction.
  • Employed general IP3R signaling suppression and specific inhibitors of apoptotic calcium release from IP3R.

Main Results:

  • Fas-dependent killing of Jurkat cells by SW620 cells necessitates calcium release from IP3R.
  • Suppression of IP3R signaling significantly reduced tumor-mediated lymphocyte apoptosis.
  • A specific inhibitor of apoptotic calcium release from IP3R effectively blocked lymphocyte apoptosis.

Conclusions:

  • IP3R-mediated calcium release is critical for Fas-dependent apoptosis of T lymphocytes induced by tumor cells.
  • Selective pharmacological targeting of apoptotic calcium release from IP3R represents a potential strategy to enhance tumor immunogenicity and anti-tumor immune responses.

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