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Updated: Jun 19, 2026

Cell Population Analyses During Skin Carcinogenesis
06:53

Cell Population Analyses During Skin Carcinogenesis

Published on: August 21, 2013

The EGF receptor provides an essential survival signal for SOS-dependent skin tumor development

M Sibilia1, A Fleischmann, A Behrens

  • 1Research Institute of Molecular Pathology, Vienna, Austria. maria.sibilia@univie.ac.at

Cell
|August 16, 2000
PubMed

Insights

Epidermal Growth Factor Receptor (EGFR) is crucial for skin development and prevents cell death during oncogenic transformation. Inhibiting EGFR may offer a therapeutic strategy for various epithelial tumors.

Area of Science:

  • Oncology
  • Dermatology
  • Molecular Biology

Background:

  • Epidermal Growth Factor Receptor (EGFR) plays a key role in skin development and is implicated in epithelial tumor formation.
  • Dominant-negative Son of Sevenless (SOS-F) expression in basal keratinocytes of transgenic mice leads to skin papillomas.
  • EGFR's role in oncogenic transformation and tumor development requires further elucidation.

Purpose of the Study:

  • To investigate the role of EGFR as a survival factor in oncogenic transformation.
  • To determine if EGFR is essential for tumor formation initiated by SOS-F.
  • To explore EGFR as a potential therapeutic target in epithelial tumors.

Main Methods:

  • Generation of transgenic mice expressing SOS-F in basal keratinocytes.
  • Utilizing EGFR hypomorphic (wa2) and null mutant mice.
  • Transformation assays with EGFR-deficient fibroblasts using SOS-F and rasV12.
  • Restoration of tumorigenicity experiments with the anti-apoptotic bcl-2 gene.
  • Analysis of apoptosis and Akt phosphorylation in papillomas and primary keratinocytes.
  • Grafting experiments to assess cell-autonomous EGFR requirement.

Main Results:

  • Tumor formation in K5-SOS-F transgenic mice was inhibited in EGFR-deficient backgrounds.
  • EGFR-deficient fibroblasts were resistant to transformation by SOS-F and rasV12.
  • Expression of bcl-2 restored tumorigenicity in EGFR-deficient cells.
  • K5-SOS-F papillomas and wa2 keratinocytes exhibited increased apoptosis and reduced Akt phosphorylation.
  • Grafting experiments confirmed a cell-autonomous requirement for EGFR in keratinocytes.

Conclusions:

  • EGFR functions as a critical survival factor in oncogenic transformation.
  • EGFR is essential for keratinocyte survival and tumor development initiated by oncogenic signaling.
  • EGFR represents a valuable therapeutic target for a wider range of tumors than previously anticipated.

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