title: Rho-dependent and -independent tyrosine phosphorylation of focal adhesion kinase, paxillin and p130Cas mediated by Ret kinase.
abstract: Glial cell line-derived neurotrophic factor (GDNF) signals through a unique receptor system that includes Ret receptor tyrosine kinase and a glycosyl-phosphatidylinositol-linked cell surface protein. In the present study, we have identified several proteins in neuroblastoma cells that are phosphorylated on tyrosine in response to GDNF. The phosphorylated proteins include focal adhesion kinase (FAK), paxillin and Crk-associated substrate, p130Cas, all of which are known to be associated with focal adhesions. Of these, paxillin and p130Cas interacted with Crk proteins in GDNF-treated neuroblastoma cells. GDNF also induced reorganization of the actin cytoskelton. Tyrosine phosphorylation of FAK, paxillin and p130Cas was inhibited by cytochalasin D or two specific inhibitors of phosphatidylinositol-3' kinase (PI-3' kinase), wortmannin and LY294002, indicating that their tyrosine phosphorylation depends on the formation of actin stress fiber and activation of PI-3' kinase. In addition, phosphorylation of FAK but not of paxillin and p130Cas was markedly impaired by the Clostridium botulinum C3 exoenzyme that specifically ADP-ribosylates and inactivates Rho. These results suggested the presence of Rho-dependent and -independent signaling pathways downstream of PI-3' kinase that mediate tyrosine phosphorylation of FAK, paxillin and p130Cas through Ret kinase.
authors: Department of Pathology, Nagoya University School of Medicine, Japan.
authors: H
authors: H
authors: Murakami
authors: T
authors: T
authors: Iwashita
authors: N
authors: N
authors: Asai
authors: Y
authors: Y
authors: Iwata
authors: S
authors: S
authors: Narumiya
authors: M
authors: M
authors: Takahashi
mesh_terms: D036002:ADP Ribose Transferases / Q000378:metabolism / Q000494:pharmacology; D000199:Actins / Q000378:metabolism; D001905:Botulinum Toxins; D015815:Cell Adhesion Molecules / Q000378:metabolism*; D050719:Crk-Associated Substrate Protein; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D003599:Cytoskeleton; D029721:Drosophila Proteins; D004789:Enzyme Activation; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; D019204:GTP-Binding Proteins / Q000378:metabolism*; D051100:Glial Cell Line-Derived Neurotrophic Factor; D051097:Glial Cell Line-Derived Neurotrophic Factor Receptors; D006801:Humans; D007424:Intracellular Fluid; D009414:Nerve Growth Factors; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D051419:Paxillin; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010750:Phosphoproteins / Q000378:metabolism*; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011506:Proteins; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D050737:Proto-Oncogene Proteins c-crk; D051096:Proto-Oncogene Proteins c-ret; D020794:Receptor Protein-Tyrosine Kinases / Q000378:metabolism*; D050717:Retinoblastoma-Like Protein p130; D015398:Signal Transduction; D014407:Tumor Cells, Cultured; D014443:Tyrosine / Q000378:metabolism*; D020741:rho GTP-Binding Proteins
chemical_list: D000199:Actins; C493841:BCAR1 protein, human; D015815:Cell Adhesion Molecules; D050719:Crk-Associated Substrate Protein; D003598:Cytoskeletal Proteins; D029721:Drosophila Proteins; C495039:GDNF protein, human; D051100:Glial Cell Line-Derived Neurotrophic Factor; D051097:Glial Cell Line-Derived Neurotrophic Factor Receptors; D009414:Nerve Growth Factors; D009419:Nerve Tissue Proteins; C496061:PXN protein, human; D051419:Paxillin; D010750:Phosphoproteins; D011506:Proteins; D011518:Proto-Oncogene Proteins; D050737:Proto-Oncogene Proteins c-crk; D050717:Retinoblastoma-Like Protein p130; D014443:Tyrosine; D036002:ADP Ribose Transferases; C063007:exoenzyme C3, Clostridium botulinum; D019869:Phosphatidylinositol 3-Kinases; D011505:Protein-Tyrosine Kinases; D051096:Proto-Oncogene Proteins c-ret; D020794:Receptor Protein-Tyrosine Kinases; C416649:Ret protein, Drosophila; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; C496050:PTK2 protein, human; D001905:Botulinum Toxins; D019204:GTP-Binding Proteins; D020741:rho GTP-Binding Proteins