title: Focal adhesion-associated proteins p125FAK and paxillin are substrates for bradykinin-stimulated tyrosine phosphorylation in Swiss 3T3 cells.
abstract: In this study we examined the involvement of the focal adhesion-associated proteins p125FAK and paxillin as substrates for bradykinin (BK)-stimulated tyrosine phosphorylation in Swiss 3T3 cells and the potential role of protein kinase C and Ca2+ in these events. BK (1 microM) stimulated tyrosine phosphorylation of p125FAK and paxillin. In addition, BK also increased the phosphotyrosine content of the src transformation-associated protein p130. The responses were rapid and transient and peaked at approximately 1 min after BK addition. Furthermore, the responses were dose-dependent with half-maximal effects occurring at 1-10 nM BK. The phosphotyrosine content of p125FAK, paxillin, and p130 was also increased following stimulation with phorbol 12-myristate 13-acetate (PMA) (0.1 microM). In contrast, PMA had no effect on the phosphotyrosine content of p125, a Ras-GAP-associated tyrosine phosphoprotein that we recently identified. Long term pretreatment (18 h) of cells with 0.3 microM PMA partially attenuated BK-stimulated phosphorylation of p125FAK but was without effect on phosphorylation of paxillin and Ras-GAP-associated p125. Furthermore, only a small inhibition of BK- and PMA-stimulated phosphorylation of p125FAK was observed following pretreatment with 25 microM BAPTA/AM. In all, these results show that multiple mechanisms are involved in BK-stimulated tyrosine phosphorylation of p125FAK, paxillin, Ras-GAP-associated p125, and src transformation-associated p130.
authors.affiliation: Department of Biochemistry, University of Texas Healh Science Center, San Antonio 78284-7760.
authors.forename: L M
authors.initials: LM
authors.lastname: Leeb-Lundberg
authors.forename: X H
authors.initials: XH
authors.lastname: Song
authors.forename: S A
authors.initials: SA
authors.lastname: Mathis
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D016475:3T3 Cells; D000818:Animals; D001920:Bradykinin / Q000494:pharmacology*; D002118:Calcium / Q000378:metabolism; D015815:Cell Adhesion Molecules / Q000378:metabolism*; D002614:Chelating Agents / Q000494:pharmacology; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; D020690:GTPase-Activating Proteins; D007546:Isoquinolines / Q000494:pharmacology; D051379:Mice; D051419:Paxillin; D010750:Phosphoproteins / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014443:Tyrosine / Q000378:metabolism*; D020703:ras GTPase-Activating Proteins
chemical_list: D015815:Cell Adhesion Molecules; D002614:Chelating Agents; D003598:Cytoskeletal Proteins; D020690:GTPase-Activating Proteins; D007546:Isoquinolines; D051419:Paxillin; D010750:Phosphoproteins; D010879:Piperazines; D011506:Proteins; C496062:Pxn protein, mouse; D020703:ras GTPase-Activating Proteins; D014443:Tyrosine; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D011505:Protein-Tyrosine Kinases; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; C496051:Ptk2 protein, mouse; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate; D001920:Bradykinin; D002118:Calcium