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AKT activation and response to interferon-beta in human cancer cells

Hanqin Lei1, Patrick J Furlong, Jin Hee Ra

  • 1Department of Surgery, Division of Surgical Oncology, The University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104, USA.

Cancer Biology & Therapy
|June 23, 2005
PubMed

Insights

Interferon-beta (IFN-beta) induces apoptosis in colorectal cancer cells. The PI3K/Akt pathway, not Jak/Stat, correlates with resistance to IFN-beta by activating Akt and phosphorylating Bad.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Interferon-beta (IFN-beta) effectively inhibits cancer cell growth and induces apoptosis, particularly in colorectal cancer.
  • The Jak/Stat pathway, specifically Stat1 induction of TRAIL, was previously considered crucial for IFN-beta-mediated apoptosis.
  • However, observed variations in colorectal cancer cell line sensitivity to IFN-beta suggested other pathways might be involved.

Purpose of the Study:

  • To investigate the role of the phosphoinositide 3-kinase (PI3K)/Akt pathway in IFN-beta-induced apoptosis in human colorectal cancer cells.
  • To determine the correlation between Akt pathway activity and cellular response to IFN-beta treatment.

Main Methods:

  • Evaluation of Akt activity and Bad phosphorylation in colorectal cancer cell lines treated with IFN-beta.
  • Genetic manipulation of the PI3K/Akt pathway in resistant and sensitive cell lines to assess sensitization or resistance.
  • Correlation analysis between signaling pathway activation and apoptosis induction.

Main Results:

  • A significant correlation was found between Akt activity, phosphorylation of Bad, and resistance to IFN-beta-induced apoptosis.
  • Disrupting the PI3K/Akt pathway sensitized resistant colorectal cancer cells to IFN-beta.
  • Expressing activated Akt in sensitive cells increased their resistance to IFN-beta.

Conclusions:

  • The PI3K/Akt pathway plays a critical role in modulating sensitivity and resistance to IFN-beta in colorectal cancer.
  • Akt-mediated phosphorylation of Bad is a key mechanism conferring resistance to IFN-beta-induced apoptosis.
  • Understanding this pathway offers potential therapeutic strategies to overcome IFN-beta resistance in colorectal cancer treatment.

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