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Early signaling dynamics of the epidermal growth factor receptor

Raven J Reddy1, Aaron S Gajadhar1, Eric J Swenson1

  • 1Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139; Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|March 2, 2016
PubMed

Insights

This study reveals rapid, system-wide phosphorylation changes in the EGF receptor (EGFR) signaling network within seconds of growth factor stimulation. It identifies distinct activation patterns for key proteins, clarifying signaling initiation mechanisms.

Area of Science:

  • Cellular signaling pathways
  • Receptor tyrosine kinase (RTK) biology
  • Posttranslational modifications

Background:

  • The Epidermal Growth Factor Receptor (EGFR) signaling network is crucial for cell growth and differentiation.
  • Immediate posttranslational changes in EGFR signaling initiation remain poorly understood.
  • Understanding early signaling events is key to elucidating fundamental biological mechanisms.

Purpose of the Study:

  • To comprehensively map system-wide phosphorylation changes in the EGFR network following growth factor stimulation.
  • To characterize the temporal dynamics of EGFR signaling initiation at high resolution.
  • To identify distinct activation patterns and regulatory mechanisms within the network.

Main Methods:

  • Utilized a mass spectrometry-based approach to measure global phosphorylation changes.
  • Analyzed signaling events with 10-second resolution over 80 seconds post-stimulation.
  • Employed proximity ligation assays and phosphatase inhibition (vanadate) to investigate protein interactions and regulation.

Main Results:

  • Observed significant phosphorylation changes in downstream proteins as early as 10 seconds post-stimulation.
  • Identified distinct temporal activation clusters for canonical EGFR network members.
  • Demonstrated that Src homology 2 domain containing transforming protein (Shc) and phosphoinositol 3-kinase (PI3K) exhibit rapid but transient phosphorylation, while Grb2-associated binder-1 (Gab1) and SH2-containing tyrosine phosphatase (SHP2) show slower, sustained increases.
  • Revealed site-specific regulatory mechanisms and primed activating components like Src family kinases.

Conclusions:

  • EGFR signaling exhibits rapid information transmission capabilities.
  • Distinct temporal activation profiles of key proteins suggest complex initiation mechanisms.
  • Phosphatase activity and Src family kinases play critical roles in regulating EGFR signaling dynamics.
Keywords:
epidermal growth factor receptormass spectrometrysignal transductiontyrosine phosphorylation

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