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Related Experiment Video

Updated: Jul 21, 2025

Author Spotlight: Tracing the Ferroptotic Signatures and Cell Death Dynamics in Medulloblastoma for Advanced Therapeutics
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A Cell Cycle-Dependent Ferroptosis Sensitivity Switch Governed by EMP2.

Jason Rodencal1, Nathan Kim1, Veronica L Li2

  • 1Department of Biology, Stanford University, Stanford, CA 94305, USA.

Biorxiv : the Preprint Server for Biology
|July 28, 2023
PubMed
Summary

Cell cycle arrest increases sensitivity to ferroptosis induced by GPX4 inhibition, not system xc- inhibition. This occurs due to increased oxidizable phospholipids in arrested cells.

Keywords:
EMP2Lipid peroxidationMBOAT1MUFAPUFAferroptosisp53

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Area of Science:

  • Cellular biology
  • Biochemistry
  • Oncology

Background:

  • Ferroptosis is a regulated cell death pathway driven by iron-dependent lipid peroxidation.
  • It can be triggered by inhibiting the cystine/glutamate antiporter (system xc-) or glutathione peroxidase 4 (GPX4).
  • Distinct regulatory mechanisms may govern ferroptosis sensitivity based on the induction method.

Approach:

  • Investigated the impact of cell cycle arrest on ferroptosis sensitivity using different inducers.
  • Analyzed changes in phospholipid composition and epithelial membrane protein 2 (EMP2) expression during cell cycle arrest.
  • Evaluated the in vivo efficacy of combining a GPX4 inhibitor with a cell cycle arresting agent.

Key Points:

  • Cell cycle arrest specifically sensitizes cells to GPX4 inhibition, not system xc- inhibition.
  • Arrested cells accumulate oxidizable phospholipids, enhancing susceptibility to GPX4 inhibition.
  • Reduced EMP2 expression upon cell cycle arrest contributes to increased ferroptosis sensitivity.
  • Combined in vivo treatment with a GPX4 inhibitor and cell cycle arrest agent increased lipid peroxidation markers.

Conclusions:

  • Cell cycle state differentially regulates ferroptosis sensitivity depending on the inducing agent.
  • GPX4 inhibition-induced ferroptosis is modulated by cell cycle-dependent changes in lipid metabolism and EMP2 expression.
  • These findings suggest potential therapeutic strategies targeting ferroptosis by manipulating cell cycle state.