Diversification of Neu differentiation factor and epidermal growth factor signaling by combinatorial receptor

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Studying the Stoichiometry of Epidermal Growth Factor Receptor in Intact Cells using Correlative Microscopy
09:16

Studying the Stoichiometry of Epidermal Growth Factor Receptor in Intact Cells using Correlative Microscopy

Published on: September 11, 2015

R Pinkas-Kramarski1, L Soussan, H Waterman

  • 1Department of Molecular Cell Biology, Weizmann Institute of Science, Israel.

The EMBO Journal
|May 15, 1996
PubMed

Insights

Epidermal Growth Factor Receptor (EGFR) family members ErbB-1 and ErbB-2 restore potent mitogenic activity to the kinase-impaired ErbB-3 receptor. Combinatorial ErbB interactions diversify signaling, with ErbB-3 complexes showing enhanced activity.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Signal Transduction

Background:

  • The ErbB receptor family plays crucial roles in cell growth and survival.
  • ErbB-1 and ErbB-2 are active tyrosine kinases, while ErbB-3 possesses a catalytically impaired kinase domain.
  • ErbB-2 is an orphan receptor, meaning its natural ligand is unknown.

Purpose of the Study:

  • To investigate the biological activity of ErbB-3 and its reconstitution by other ErbB family members.
  • To elucidate the mechanisms of transactivation and signal diversification within ErbB receptor complexes.
  • To analyze the impact of heterodimerization on mitogenic signaling potency.

Main Methods:

  • Utilized interleukin-3-dependent cells engineered to express ErbB-1, ErbB-2, and ErbB-3.
  • Assessed receptor activity through ectopic expression of individual receptors and their combinations.
  • Analyzed receptor phosphorylation, heterodimer formation, and activation of downstream kinases (ERK, c-Jun).

Main Results:

  • ErbB-3 alone exhibits no biological activity; ErbB-1 and ErbB-2 reconstitute its potent mitogenic activity.
  • Transactivation of ErbB-3 involves heterodimer formation, receptor phosphorylation, and ligand affinity regulation.
  • ErbB-3-containing heterodimers, particularly ErbB-2/ErbB-3, demonstrate superior mitogenic and survival signaling compared to homodimers.
  • ErbB-1 signaling dominates over ErbB-3 when coexpressed, despite ErbB-3's enhanced activity in complexes.

Conclusions:

  • Combinatorial interactions among ErbB receptors diversify signal transduction pathways.
  • Heterodimerization, especially involving ErbB-3, significantly enhances mitogenic and survival signaling.
  • The kinase-defective ErbB-3 receptor's superior activity is regulated in cis and in trans through complex formation.

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