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Interferon-alpha induces TRAIL expression and cell death via an IRF-1-dependent mechanism in human bladder cancer

Angela Papageorgiou1, Colin P N Dinney, David J McConkey

  • 1Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA.

Cancer Biology & Therapy
|July 10, 2007
PubMed

Insights

Interferon-alpha (IFNalpha) triggers apoptosis in bladder cancer cells by upregulating TRAIL. This process relies on STAT-1 and IRF-1 transcription factors, highlighting a key mechanism for IFNalpha-induced cell death.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Interferon-alpha (IFNalpha) induces apoptosis in various cell types, often via TRAIL.
  • The role of TRAIL in IFNalpha-mediated apoptosis in human bladder cancer cells was previously unclear.

Purpose of the Study:

  • To investigate if TRAIL is essential for IFNalpha-induced apoptosis in human bladder cancer cells (UM-UC-12).
  • To elucidate the molecular mechanisms underlying IFNalpha-induced TRAIL expression.

Main Methods:

  • Cell treatment with IFNalpha and TRAIL pathway inhibitors.
  • siRNA-mediated knockdown of TRAIL, FADD, caspase-8, STAT-1, and IRF-1.
  • Analysis of STAT-1 phosphorylation, DNA binding activity, and IRF-1 accumulation.
  • Chromatin immunoprecipitation (ChIP) assays to assess transcription factor binding to the TRAIL promoter.

Main Results:

  • IFNalpha induced concentration-dependent TRAIL expression and apoptosis in UM-UC-12 cells.
  • Inhibition of TRAIL or downstream signaling components (FADD, caspase-8) reduced IFNalpha-induced cell death.
  • IFNalpha rapidly activated STAT-1 and IRF-1, which were crucial for TRAIL induction and apoptosis.
  • STAT-1 and IRF-1 directly bound to the TRAIL promoter upon IFNalpha stimulation.

Conclusions:

  • TRAIL is a critical mediator of IFNalpha-induced apoptosis in human bladder cancer cells.
  • IFNalpha activates TRAIL expression through a STAT-1 and IRF-1 dependent pathway.
  • This mechanism provides insight into the anti-cancer effects of IFNalpha in bladder cancer.

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