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Efficient suppression of FGF-2-induced ERK activation by the cooperative interaction among mammalian Sprouty isoforms

Kei-ichi Ozaki1, Satsuki Miyazaki, Susumu Tanimura

  • 1Laboratory of Cell Regulation, Department of Pharmaceutical Sciences, Graduate School of Biomedical Sciences, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Japan.

Journal of Cell Science
|December 13, 2005
PubMed

Insights

Sprouty proteins regulate cell growth by inhibiting the receptor tyrosine kinase/extracellular signal-regulated kinase (RTK/ERK) pathway. Their cooperative interactions, especially Sprouty1 and Sprouty4, enhance this inhibition.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • The receptor tyrosine kinase (RTK)/extracellular signal-regulated kinase (ERK) pathway is crucial for cellular growth and is tightly regulated.
  • Sprouty proteins are key negative regulators of the RTK/ERK pathway, with four isoforms (Sprouty1-4) identified in mammals.

Purpose of the Study:

  • To investigate the molecular mechanisms of Sprouty protein-mediated inhibition of the RTK/ERK pathway.
  • To explore the cooperative interactions among Sprouty isoforms and their impact on pathway regulation.

Main Methods:

  • Analysis of interactions between Sprouty isoforms (Sprouty1-4).
  • Assessing the inhibitory effects of individual Sprouty isoforms and their hetero-oligomers on fibroblast growth factor-2 (FGF-2)-induced ERK activation.
  • Investigating the molecular targets of Sprouty hetero-oligomers, specifically the Grb2-Sos1 complex and FRS2.

Main Results:

  • All four mammalian Sprouty isoforms interact, forming homo- and hetero-oligomers via their C-terminal domains.
  • Sprouty1 interacts with Grb2, while Sprouty4 interacts with Sos1.
  • Sprouty hetero-oligomers exhibit enhanced inhibitory activity on ERK activation compared to individual isoforms. The Sprouty1-Sprouty4 hetero-oligomer is particularly potent, suppressing Grb2-Sos1 complex association with FRS2.

Conclusions:

  • Cooperative interactions among Sprouty isoforms represent a sophisticated mechanism for stringent regulation of the RTK/ERK pathway in mammalian cells.
  • Sprouty hetero-oligomers, especially Sprouty1-Sprouty4, offer a more effective means of inhibiting RTK/ERK signaling by disrupting key protein complex formation.

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