IFN-beta induces caspase-mediated apoptosis by disrupting mitochondria in human advanced stage colon cancer cell

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Shin-Hun Juang1, Sung-Jen Wei, Yi-Mei Hung

  • 1Cancer Research Cooperative Laboratory, NHRI, Taipei 100, ROC.

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|May 18, 2004
PubMed

Insights

Recombinant human interferon-beta (rHuIFN-beta) triggers apoptosis in specific colon cancer cells. This occurs via mitochondrial damage and caspase activation, independent of p53 or Fas/FasL pathways.

Area of Science:

  • Oncology
  • Cell Biology
  • Immunology

Background:

  • Human interferon-beta (HuIFN-beta) exhibits variable efficacy in inhibiting colon cancer cell growth.
  • Colon cancer cell lines display differential responses to HuIFN-beta, influenced by p53 mutation status and tumor grade.

Purpose of the Study:

  • To investigate the mechanisms by which recombinant human interferon-beta (rHuIFN-beta) induces apoptosis in p53-mutant colon cancer cell lines.
  • To elucidate the role of p53, Fas/FasL pathway, and mitochondrial integrity in HuIFN-beta-mediated apoptosis.

Main Methods:

  • In vitro treatment of human colon cancer cell lines (COH, CC-M2, HT-29) with varying concentrations of HuIFN-beta.
  • Analysis of apoptosis, cell cycle, Fas/FasL protein levels, mitochondrial membrane potential, and caspase activation (caspase-9, -8, -3).
  • Use of specific inhibitors and blocking antibodies to dissect apoptotic pathways.

Main Results:

  • HuIFN-beta induced apoptosis in p53-mutant COH and CC-M2 cells, but only cell cycle arrest in HT-29 cells.
  • Apoptosis in COH and CC-M2 cells involved increased Fas/FasL, altered mitochondrial potential, and caspase cascade activation.
  • Fas/FasL blocking agents did not prevent apoptosis, while caspase inhibitors blocked DNA fragmentation but not mitochondrial changes.
  • Mitochondria-stabilizing reagents abrogated HuIFN-beta-induced apoptosis and caspase activation.

Conclusions:

  • HuIFN-beta induces apoptosis in susceptible colon cancer cells primarily through mitochondrial membrane destabilization and subsequent caspase cascade activation.
  • The apoptotic mechanism is independent of the p53 status and Fas/FasL signaling pathway in these cell lines.
  • Targeting mitochondrial pathways may enhance HuIFN-beta's therapeutic potential in colon cancer treatment.

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