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The bimodal regulation of epidermal growth factor signaling by human Sprouty proteins

James E Egan1, Amy B Hall, Bogdan A Yatsula

  • 1Department of Molecular Genetics and Microbiology and Graduate Program in Molecular Pharmacology, State University of New York, Stony Brook, NY 11794-5222, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 2, 2002
PubMed

Insights

Sprouty proteins regulate epidermal growth factor receptor (EGFR) signaling. Full-length Sprouty can enhance EGFR activity, while truncated forms inhibit it, revealing a dual regulatory role.

Area of Science:

  • Cellular biology
  • Molecular mechanisms of signal transduction

Background:

  • Epidermal growth factor receptor (EGFR) signaling is crucial for multicellular organism development.
  • Sprouty proteins are identified as inhibitors of EGFR signaling, but their precise mechanisms are unclear.

Purpose of the Study:

  • To investigate the functional properties of human Sprouty (hSpry) proteins in EGFR signaling.
  • To elucidate the molecular mechanisms underlying Sprouty's role in regulating EGFR-mediated pathways.

Main Methods:

  • Transient expression of full-length and truncated human Sprouty proteins (hSpry1, hSpry2) in human cells.
  • Analysis of EGFR-mediated mitogen-activated protein (MAP) kinase activation.
  • Investigation of protein interactions, including c-Cbl sequestration and EGFR ubiquitination/degradation.

Main Results:

  • Full-length hSpry1 and hSpry2 potentiated EGFR-mediated MAP kinase activation.
  • Truncation mutants, particularly those with the conserved carboxyl-terminal cysteine-rich domain, inhibited EGF-induced MAP kinase activation.
  • Full-length hSpry2's potentiation involved its amino-terminal domain, sequestering c-Cbl and reducing EGFR ubiquitination and degradation.

Conclusions:

  • Human Sprouty proteins exhibit domain-dependent dual functions, acting as both negative and positive regulators of EGFR-mediated MAP kinase signaling.
  • This dual regulation by hSpry2 may provide a mechanism for balancing EGFR pathway activation and repression.

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