PLC-gamma1 is required for IGF-I protection from cell death induced by loss of extracellular matrix adhesion

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Updated: Oct 1, 2026

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
08:55

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis

Published on: August 7, 2018

Ansuman Chattopadhyay1, Graham Carpenter

  • 1Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, USA.

Journal of Cell Science
|April 26, 2002
PubMed

Insights

Phospholipase C-gamma1 is crucial for cell survival, mediating insulin-like growth factor

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Phospholipase C-gamma1 (PLCγ1) is a key enzyme in signal transduction pathways.
  • PLCγ1 hydrolyzes phosphatidylinositol 4,5-bisphosphate, generating second messengers.
  • Anoikis is programmed cell death triggered by loss of cell adhesion.

Purpose of the Study:

  • To investigate the role of PLCγ1 in anoikis.
  • To determine if PLCγ1 mediates insulin-like growth factor (IGF)-dependent cell survival.
  • To examine IGF-stimulated tyrosine phosphorylation of PLCγ1.

Main Methods:

  • Generation of Plcg1-null mouse embryonic fibroblasts (Null cells).
  • Re-expression of PLCγ1 in Null cells to create Null+ cells.
  • Induction of anoikis by cell suspension and measurement of cell death and caspase 3 activity.
  • Assessment of IGF rescue effects and tyrosine phosphorylation.

Main Results:

  • Null cells underwent significant suspension-induced cell death.
  • Null+ cells showed resistance to suspension-induced cell death.
  • Insulin-like growth factor rescued Null+ cells but not Null cells from anoikis.
  • IGF stimulated tyrosine phosphorylation of PLCγ1 in both adherent and suspended cells.

Conclusions:

  • Phospholipase C-gamma1 is essential for insulin-like growth factor-dependent cell survival during anoikis.
  • PLCγ1 plays a critical role in preventing programmed cell death upon loss of matrix adhesion.
  • IGF signaling pathway involves tyrosine phosphorylation of PLCγ1 for cell survival.

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