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IP3, a small molecule with a powerful message.

Elke Decrock1, Marijke De Bock, Nan Wang

  • 1Department of Basic Medical Sciences, Ghent University, Ghent, Belgium.

Biochimica Et Biophysica Acta
|January 8, 2013
PubMed
Summary
This summary is machine-generated.

Inositol 1,4,5-trisphosphate (IP3) diffuses through gap junctions to trigger apoptosis in neighboring cells. Additional factors are necessary to convert IP3 into a cell death inducer, impacting cell survival and pathology.

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Published on: July 26, 2019

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Signaling Pathways

Background:

  • Cell death, particularly apoptosis, can extend beyond single cells via intercellular communication.
  • Gap junctions formed by connexin43 and connexin26 facilitate cell death propagation.
  • Inositol 1,4,5-trisphosphate (IP3) diffusion through gap junctions is critical for inducing apoptosis in adjacent cells.

Purpose of the Study:

  • To review the role of IP3 as an intracellular and intercellular cell death messenger.
  • To discuss factors that enable IP3 to act as a cell killer.
  • To highlight pathological conditions linked to aberrant IP3/Ca(2+) signaling.

Main Methods:

  • Literature review focusing on IP3 signaling and intercellular communication.
  • Analysis of the endoplasmic reticulum-mitochondrial synapse in cell death.
  • Discussion of Ca(2+) signaling in apoptosis induction and progression.

Main Results:

  • IP3 diffusion via gap junctions promotes and expands cell death.
  • IP3 alone is insufficient for cell death induction; additional factors are required.
  • Fine-tuning of IP3-evoked Ca(2+) signaling is crucial for cell physiology; dysregulation leads to cell death.

Conclusions:

  • IP3 acts as a key intercellular messenger in apoptosis.
  • The endoplasmic reticulum-mitochondrial axis is central to IP3's role in cell death.
  • Anomalous intercellular IP3/Ca(2+) signaling may contribute to various pathologies.