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Interferon gamma-dependent transactivation of epidermal growth factor receptor

Elena Burova1, Konstantin Vassilenko, Victoria Dorosh

  • 1Department of Intracellular Signaling and Transport, Institute of Cytology of Russian Academy of Sciences, St.-Petersburg 194064, Russia. lenbur87@mail.ru

FEBS Letters
|March 17, 2007
PubMed

Insights

Interferon gamma (IFNgamma) rapidly activates the epidermal growth factor receptor (EGFR) in A431 cells. This EGFR activation is crucial for IFNgamma-induced signaling pathways involving STAT1 and ERK1,2 activation.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Immunology

Background:

  • Interferon gamma (IFNgamma) is a cytokine with diverse biological functions.
  • The epidermal growth factor receptor (EGFR) is a key regulator of cell growth and survival.
  • Cross-talk between cytokine and growth factor signaling pathways is increasingly recognized.

Purpose of the Study:

  • To investigate the role of EGFR in IFNgamma signaling.
  • To elucidate the molecular mechanisms underlying IFNgamma-induced EGFR activation.
  • To determine the contribution of EGFR to IFNgamma-mediated cellular responses.

Main Methods:

  • Utilized A431 and HeLa cell lines.
  • Investigated tyrosine phosphorylation of EGFR upon IFNgamma stimulation.
  • Assessed the impact of kinase inhibitors (EGFR, Src, JAK2) on signaling pathways.
  • Analyzed STAT1 and ERK1,2 activation using biochemical assays.

Main Results:

  • IFNgamma rapidly induces tyrosine phosphorylation of EGFR in A431 cells.
  • IFNgamma-induced EGFR transactivation requires EGFR, Src-family kinases, and JAK2 activity.
  • EGFR and Src kinase activity are partially required for IFNgamma-induced STAT1 activation.
  • EGFR kinase activity is essential for IFNgamma-induced ERK1,2 activation.

Conclusions:

  • EGFR is implicated in IFNgamma-dependent signaling pathways.
  • EGFR plays a critical role in mediating IFNgamma-induced STAT1 and ERK1,2 activation.
  • This study reveals a novel cross-talk mechanism between IFNgamma and EGFR signaling.

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