Waters, Catherine M and Connell, Michelle C and Pyne, Susan and Pyne, Nigel J (2005) c-Src is involved in regulating signal transmission from PDGFbeta receptor-GPCR(s) complexes in mammalian cells. Cellular Signalling, 17 (2). pp. 263-277. ISSN 0898-6568Full text not available in this repository. (Request a copy from the Strathclyde author)
We have reported that the platelet-derived growth factor receptor-beta (PDGFbeta) forms a novel signaling complex with G protein-coupled receptors (GPCR) (e.g. S1P(1) receptor) that enables more efficient activation of p42/p44 mitogen-activated protein kinase (MAPK) in response to PDGF and sphingosine 1-phosphate (S1P). We now demonstrate that c-Src participates in regulating the endocytosis of PDGFbeta receptor-GPCR complexes in response to PDGF. This leads to association of cytoplasmic p42/p44 MAPK with the receptor complex in endocytic vesicles. c-Src is regulated by G protein betagamma subunits and can interact with beta-arrestin. Indeed, the PDGF-dependent activation of p42/p44 MAPK was reduced by over-expression of the C-terminal domain of GRK2 (sequesters Gbetagamma subunits), the clathrin-binding domain of beta-arrestin and by inhibitors of c-Src and clathrin-mediated endocytosis. Moreover, PDGF and S1P induce the recruitment of c-Src to the PDGFbeta receptor-S1P(1) receptor complex. This leads to a G protein/c-Src-dependent tyrosine phosphorylation of Gab1 and accumulation of dynamin II at the plasma membrane, a step required for endocytosis of the PDGFbeta receptor-GPCR complex. These findings provide important information concerning the molecular organisation of novel receptor tyrosine kinase (RTK)-GPCR signal relays in mammalian cells.
|Keywords:||adaptor proteins, signal transducing, animals, arrestins, cadaverine, cell line, cells, cultured, concanavalin A, cyclic AMP-dependent protein kinases, dynamin II, endocytosis, enzyme inhibitors, GRB2 adaptor protein, guinea pigs, humans, immunoprecipitation, lysophospholipids, mitogen-activated protein kinase 1, mitogen-activated protein kinase 3, myocytes, smooth muscle, pertussis toxin, phosphatidylinositol 3-kinases, phosphoproteins, phosphorylation, platelet-derived growth factor, proto-oncogene proteins pp60(c-src), pyrimidines, receptor, platelet-derived Growth Factor beta, receptors, G-protein-coupled, signal transduction, sphingosine, transfection, tansport vesicles, beta-adrenergic receptor kinases, Pharmacy and materia medica, Cell Biology|
|Subjects:||Medicine > Pharmacy and materia medica|
|Department:||Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences|
|Depositing user:||Pure Administrator|
|Date Deposited:||11 Nov 2011 16:38|
|Last modified:||24 Jun 2016 02:33|