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Epidermal growth factor receptor induced apoptosis: potentiation by inhibition of Ras signaling

T Högnason1, S Chatterjee, T Vartanian

  • 1Department of Neurology, Beth Israel Deaconess Medical Center and Harvard Medical School Boston, Boston, MA 02115, USA.

FEBS Letters
|February 28, 2001
PubMed

Insights

Epidermal Growth Factor Receptor (EGFR) overexpression induces apoptosis, requiring tyrosine kinase activity. Blocking Ras signaling potentiates this effect, indicating Ras is a survival signal.

Area of Science:

  • Cell biology
  • Molecular oncology
  • Signal transduction

Background:

  • High epidermal growth factor receptor (EGFR) expression in tumor cells is linked to apoptosis upon epidermal growth factor (EGF) exposure.
  • The precise mechanism, whether direct receptor overexpression or other genetic factors, causing this apoptosis sensitivity remains unclear.

Purpose of the Study:

  • To investigate the role of EGFR expression levels in inducing apoptosis.
  • To determine the signaling pathways involved in EGFR-mediated apoptosis.

Main Methods:

  • Experimentally increasing EGFR expression in various cell types.
  • Utilizing dominant-negative Ras mutants to probe EGFR signaling.
  • Assessing the requirement of tyrosine kinase activity and autophosphorylation sites.

Main Results:

  • Experimentally elevated EGFR levels consistently induced apoptosis across different cell types.
  • Apoptosis induction necessitates an active tyrosine kinase but not EGFR autophosphorylation sites.
  • Dominant-negative Ras expression significantly enhanced EGFR-induced apoptosis, implicating Ras as a survival signal.

Conclusions:

  • EGFR overexpression can directly trigger apoptosis, dependent on its tyrosine kinase activity.
  • Ras activation acts as a crucial survival signal downstream of EGFR.
  • Inhibition of Ras signaling potentiates EGFR-induced apoptosis, partly via blocking Akt activation.

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