title: Phosphorylation of focal adhesion kinase at tyrosine 861 is crucial for Ras transformation of fibroblasts.
abstract: Although elevated expression and increased tyrosine phosphorylation of focal adhesion kinase (FAK) are crucial for tumor progression, the mechanism by which FAK promotes oncogenic transformation is unclear. We have therefore determined the role of FAK phosphorylation at tyrosine 861 in the oncogenic transformation of NIH3T3 fibroblasts. FAK phosphorylation at tyrosine 861 was increased in both constitutively H-Ras-transformed and H-Ras-inducible NIH3T3 cells, in parallel with cell transformation. However, H-Ras-inducible cells transfected with the nonphosphorylatable mutant FAK Y861F showed decreased migration/invasion, focus forming activity and anchorage-independent growth, compared with either wild-type or kinase-defective FAK. In contrast to unaltered FAK/Src activity, the association of FAK and p130(CAS) was decreased in FAK Y861F-transfected cells, and FAK phosphorylation at tyrosine 861 enhanced this association in vitro. Consistently, FAK Y861F-transfected cells were defective in activation of c-Jun NH(2)-terminal kinase and in expression of matrix metalloproteinase-9 during transformation. Taken together, these results strongly suggest that FAK phosphorylation at tyrosine 861 is crucial for H-Ras-induced transformation through regulation of the association of FAK with p130(CAS).
authors.affiliation: Department of Life Sciences, Ewha Womans University, Seoul 120-750, Korea.
authors.forename: Yangmi
authors.initials: Y
authors.lastname: Lim
authors.forename: Innoc
authors.initials: I
authors.lastname: Han
authors.forename: Jihyun
authors.initials: J
authors.lastname: Jeon
authors.forename: Haein
authors.initials: H
authors.lastname: Park
authors.forename: Young-Yil
authors.initials: YY
authors.lastname: Bahk
authors.forename: Eok-Soo
authors.initials: ES
authors.lastname: Oh
mesh_terms: D000818:Animals; D002471:Cell Transformation, Neoplastic; D050719:Crk-Associated Substrate Protein; D004789:Enzyme Activation; D005347:Fibroblasts / Q000166:cytology / Q000502:physiology*; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; D011905:Genes, ras; D048031:JNK Mitogen-Activated Protein Kinases; D020780:Matrix Metalloproteinase 9 / Q000235:genetics / Q000378:metabolism; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D016297:Mutagenesis, Site-Directed; D041681:NIH 3T3 Cells; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000235:genetics / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism; D050717:Retinoblastoma-Like Protein p130; D014443:Tyrosine / Q000378:metabolism*; D018631:ras Proteins / Q000378:metabolism*
chemical_list: C493842:Bcar1 protein, mouse; D050719:Crk-Associated Substrate Protein; D011506:Proteins; D050717:Retinoblastoma-Like Protein p130; D014443:Tyrosine; D011505:Protein-Tyrosine Kinases; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; C496051:Ptk2 protein, mouse; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D020780:Matrix Metalloproteinase 9; D018631:ras Proteins