Shp2, an SH2-containing protein-tyrosine phosphatase, positively regulates receptor tyrosine kinase signaling by dephosphorylating and inactivating the inhibitor sprouty

Hiroshi Hanafusa, Satoru Torii, Takayuki Yasunaga, Kunihiro Matsumoto, Eisuke Nishida

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    Src homology 2-containing phosphotyrosine phosphatase (Shp2) functions as a positive effector in receptor tyrosine kinase (RTK) signaling immediately proximal to activated receptors. However, neither its physiological substrate(s) nor its mechanism of action in RTK signaling has been defined. In this study, we demonstrate that Sprouty (Spry) is a possible target of Shp2. Spry acts as a conserved inhibitor of RTK signaling, and tyrosine phosphorylation of Spry is indispensable for its inhibitory activity. Shp2 was able to dephosphorylate fibroblast growth factor receptor-induced phosphotyrosines on Spry both in vivo and in vitro. Shp2-mediated dephosphorylation of Spry resulted in dissociation of Spry from Grb2. Furthermore, Shp2 could reverse the inhibitory effect of Spry on FGF-induced neurite outgrowth and MAP kinase activation. These findings suggest that Shp2 acts as a positive regulator in RTK signaling by dephosphorylating and inactivating Spry.

    元の言語English
    ページ(範囲)22992-22995
    ページ数4
    ジャーナルJournal of Biological Chemistry
    279
    発行部数22
    DOI
    出版物ステータスPublished - 2004 5 28

    ASJC Scopus subject areas

    • Biochemistry
    • Molecular Biology
    • Cell Biology

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