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Abortive autophagy induces endoplasmic reticulum stress and cell death in cancer cells

Sofie Claerhout1, Bhaskar Dutta, Wouter Bossuyt

  • 1Department of Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America. SAClaerhout@mdanderson.org

Plos One
|June 30, 2012
PubMed

Insights

The coatomer complex I (COPI) is essential for productive autophagy and cell survival. Inhibiting COPI may promote cancer cell death when apoptosis is compromised, offering a new therapeutic strategy.

Area of Science:

  • Cell Biology
  • Molecular Oncology

Background:

  • Autophagic cell death is a proposed mechanism for eliminating damaged and cancer cells.
  • Regulation of autophagic cell death remains poorly understood, highlighting a gap in current knowledge.

Purpose of the Study:

  • To identify modulators of the autophagic cell death pathway.
  • To elucidate the effects of these modulators on cellular signaling and function.

Main Methods:

  • Utilized siRNA library screening to identify key regulators.
  • Investigated the impact of coatomer complex I (COPI) depletion on cell survival and autophagy.
  • Analyzed alterations in growth factor signaling and endoplasmic reticulum stress.

Main Results:

  • An intact coatomer complex I (COPI) is crucial for productive autophagy.
  • COPI depletion reduced cell survival and impaired autophagy, preceding endoplasmic reticulum stress.
  • COPI depletion induced abortive autophagy and altered growth factor signaling in cancer cells.
  • COPI members are overexpressed in various cancer cell lines and tissues, correlating with poor prognosis.

Conclusions:

  • The coatomer complex is essential for productive autophagy and cellular survival.
  • Inhibition of COPI may serve as a strategy to induce cancer cell death, particularly when apoptosis is impaired.

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