Fyn kinase-directed activation of SH2 domain-containing protein-tyrosine phosphatase SHP-2 by Gi protein-coupled receptors in Madin-Darby canine kidney cells.
SHP-2, an SH2 domain-containing protein-tyrosine phosphatase, plays an important role in receptor tyrosine kinase-regulated cell proliferation and differentiation. Little is known about the activation mechanisms and the participation of SHP-2 in the activity of G protein-coupled receptors lacking intrinsic tyrosine kinase activity. We show that the activity of SHP-2 (but ... not SHP-1) is specifically stimulated by the selective alpha2A-adrenergic receptor agonist UK14304 and by lysophosphatidic acid (LPA) in Madin-Darby canine kidney (MDCK) cells. UK14304 and LPA promote the tyrosine phosphorylation of SHP-2 and its association with Grb2. The agonist-induced direct interaction of Grb2 with SHP-2 is mediated by the SH2 domain of Grb2 and the tyrosine phosphorylation of SHP-2. Rapid activation of Src family kinase by UK14304 preceded the SHP-2 activation. Among the Src family members (Src, Fyn, Lck, Yes, and Lyn) present in MDCK cells, Fyn was the only one specifically associated with SHP-2, and the physical interaction between them, which requires the Src family kinase activity, was increased in response to the agonists. Pertussis toxin, PP1 (a selective Src family kinase inhibitor), or overexpression of a catalytically inactive mutant of Fyn blocked the UK14304- or LPA-stimulated activity of SHP-2, SHP-2 tyrosine phosphorylation, and SHP-2 association with Grb2. Therefore, we have demonstrated for the first time that the activation of SHP-2 by these Gi protein-coupled receptors requires Fyn kinase and that there is a specific physical interaction of Fyn kinase with SHP-2 in MDCK cells.
Mesh Terms:
Adaptor Proteins, Signal Transducing, Amino Acid Sequence, Animals, Cell Line, Dogs, Enzyme Activation, GRB2 Adaptor Protein, GTP-Binding Protein alpha Subunits, Gi-Go, Intracellular Signaling Peptides and Proteins, Molecular Sequence Data, Pertussis Toxin, Protein Binding, Protein Tyrosine Phosphatase, Non-Receptor Type 11, Protein Tyrosine Phosphatase, Non-Receptor Type 6, Protein Tyrosine Phosphatases, Protein-Tyrosine Kinases, Proteins, Receptors, Adrenergic, alpha-2, Receptors, Cell Surface, Receptors, G-Protein-Coupled, Receptors, Lysophosphatidic Acid, SH2 Domain-Containing Protein Tyrosine Phosphatases, Virulence Factors, Bordetella, src Homology Domains, src-Family Kinases
Adaptor Proteins, Signal Transducing, Amino Acid Sequence, Animals, Cell Line, Dogs, Enzyme Activation, GRB2 Adaptor Protein, GTP-Binding Protein alpha Subunits, Gi-Go, Intracellular Signaling Peptides and Proteins, Molecular Sequence Data, Pertussis Toxin, Protein Binding, Protein Tyrosine Phosphatase, Non-Receptor Type 11, Protein Tyrosine Phosphatase, Non-Receptor Type 6, Protein Tyrosine Phosphatases, Protein-Tyrosine Kinases, Proteins, Receptors, Adrenergic, alpha-2, Receptors, Cell Surface, Receptors, G-Protein-Coupled, Receptors, Lysophosphatidic Acid, SH2 Domain-Containing Protein Tyrosine Phosphatases, Virulence Factors, Bordetella, src Homology Domains, src-Family Kinases
J. Biol. Chem.
Date: Apr. 30, 1999
PubMed ID: 10212213
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