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PLA2R1 kills cancer cells by inducing mitochondrial stress

Arnaud Augert1, David Vindrieux2, Christophe A Girard3

  • 1INSERM U1052, Centre de Recherche en Cancérologie de Lyon, Lyon F-69373, France; CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Lyon F-69373, France; Centre Léon Bérard, Lyon F-69373, France; Université de Lyon, Lyon F-69373, France; UMR8161, Institut de Biologie de Lille, CNRS/Universités de Lille 1 et 2, Lille F-5900, France.

Free Radical Biology & Medicine
|September 3, 2013
PubMed

Insights

The phospholipase A2 receptor (PLA2R1) controls cancer cell death by impacting mitochondrial reactive oxygen species (ROS) production. Its reduced expression in breast cancer suggests a role in tumor suppression via apoptosis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • The biological functions of phospholipase A2 receptor (PLA2R1) are largely unknown, beyond its binding of secreted phospholipases A2 (sPLA2s).
  • Previous research demonstrated PLA2R1's role in regulating senescence in normal human cells.

Purpose of the Study:

  • To investigate the role of PLA2R1 in controlling cancer cell growth.
  • To elucidate the mechanisms underlying PLA2R1's function in cancer cells.

Main Methods:

  • Analysis of PLA2R1 expression in breast cancer cell lines and normal mammary epithelial cells.
  • Ectopic expression of PLA2R1 in cancer cells.
  • Structure-function studies of PLA2R1.
  • Investigation of sPLA2-related signaling pathways.
  • Functional experiments assessing cell death mechanisms, including reactive oxygen species (ROS) production and mitochondrial electron transport chain activity.

Main Results:

  • PLA2R1 expression is significantly decreased in breast cancer cell lines compared to normal cells.
  • Ectopic expression of PLA2R1 induced apoptosis in cancer cells and senescence in normal cells.
  • PLA2R1's effect on cell death is independent of sPLA2 signaling.
  • Cell death regulation by PLA2R1 is mediated by ROS production.
  • The mitochondrial electron transport chain is critical for PLA2R1-induced ROS production and cell death.

Conclusions:

  • PLA2R1 plays a crucial role in controlling cancer cell death.
  • PLA2R1 influences cancer cell fate through a ROS-dependent mechanism involving mitochondrial biology.
  • Reduced PLA2R1 expression may contribute to breast cancer development.
Keywords:
Cell deathFree radicalsMitochondriaPLA2R1ROSSenescence

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