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Che-1 activates XIAP expression in response to DNA damage

T Bruno1, S Iezzi, F De Nicola

  • 1Laboratory B, Department of Therapeutic Programs Development, Regina Elena Cancer Institute, Rome, Italy.

Cell Death and Differentiation
|December 1, 2007
PubMed

Insights

Che-1 promotes cancer cell survival by activating X-linked inhibitor of apoptosis protein (XIAP) expression through phosphorylation and NF-kappaB signaling. Downregulating Che-1 enhances anticancer drug effectiveness, offering a potential therapeutic strategy.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Death Regulation

Background:

  • X-linked inhibitor of apoptosis protein (XIAP) is a potent apoptosis suppressor and a cancer treatment target.
  • Che-1 is an antiapoptotic agent regulating gene transcription and proliferation, interacting with DNA damage response kinases.
  • Che-1 depletion sensitizes tumor cells to anticancer drugs.

Purpose of the Study:

  • To investigate the role of Che-1 in regulating XIAP expression.
  • To elucidate the mechanism by which Che-1 influences XIAP.
  • To determine the necessity of XIAP for Che-1's antiapoptotic function.

Main Methods:

  • Investigated Che-1's effect on XIAP expression in response to DNA damage.
  • Analyzed the role of Che-1 phosphorylation and NF-kappaB in this process.
  • Assessed the impact of XIAP expression on Che-1's antiapoptotic activity.
  • Utilized small interference RNA (siRNA) for in vivo Che-1 downregulation.

Main Results:

  • Che-1 activates XIAP expression in response to DNA damage.
  • This activation is mediated by Che-1 phosphorylation and requires NF-kappaB.
  • XIAP expression is essential for the antiapoptotic activity of Che-1.
  • In vivo Che-1 downregulation significantly enhanced anticancer drug cytotoxicity.

Conclusions:

  • Che-1 plays a crucial role in activating XIAP expression, thereby promoting cancer cell survival.
  • The Che-1-XIAP pathway represents a potential therapeutic target for enhancing anticancer drug efficacy.
  • Targeting Che-1 could overcome resistance to apoptosis in cancer treatment.

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