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The dependence receptor DCC (deleted in colorectal cancer) defines an alternative mechanism for caspase activation

C Forcet1, X Ye, L Granger

  • 1Apoptosis/Differentiation Laboratory, Molecular and Cellular Genetic Center, Centre National de la Recherche Scientifique Unité Mixte de Recherche 5534, University of Lyon, 69622 Villeurbanne, France.

Proceedings of the National Academy of Sciences of the United States of America
|March 15, 2001
PubMed

Insights

Deleted in colorectal cancer (DCC) functions as a dependence receptor, inducing cell death independently of known apoptotic pathways. This discovery reveals a novel mechanism for caspase activation in cancer research.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Biology

Background:

  • Deleted in colorectal cancer (DCC) expression is reduced in various cancers, but its tumor suppressor role is debated.
  • DCC acts as a dependence receptor, triggering apoptosis when its ligand is absent.
  • Previous research questioned DCC's tumor suppressor function due to limited mutations and mouse models.

Purpose of the Study:

  • To investigate the precise mechanism by which DCC induces cell death.
  • To elucidate the signaling pathway activated by DCC-mediated apoptosis.
  • To determine if DCC utilizes known apoptotic pathways.

Main Methods:

  • Investigated DCC-induced cell death pathways.
  • Analyzed DCC interactions with caspases.
  • Assessed caspase activation independent of mitochondria and death receptors.

Main Results:

  • DCC drives cell death independently of the mitochondria-dependent and death receptor/caspase-8 pathways.
  • DCC directly interacts with caspase-3 and caspase-9.
  • DCC activates caspase-3 via caspase-9 without requiring cytochrome c or Apaf-1.

Conclusions:

  • DCC defines a novel, apoptosome-independent pathway for caspase activation.
  • This finding provides new insights into DCC's role in cancer and cell death.
  • DCC represents a new target for cancer therapy development.

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