title: Human cytomegalovirus chemokine receptor US28-induced smooth muscle cell migration is mediated by focal adhesion kinase and Src.
abstract: The human cytomegalovirus-encoded chemokine receptor US28 induces arterial smooth muscle cell (SMC) migration; however, the underlying mechanisms involved in this process are unclear. We have previously shown that US28-mediated SMC migration occurs by a ligand-dependent process that is sensitive to protein-tyrosine kinase inhibitors. We demonstrate here that US28 signals through the non-receptor protein-tyrosine kinases Src and focal adhesion kinase (FAK) and that this activity is necessary for US28-mediated SMC migration. In the presence of RANTES (regulated on activation normal T cell expressed and secreted), US28 stimulates the production of a FAK.Src kinase complex. Interestingly, Src co-immunoprecipitates with US28 in a ligand-dependent manner. This association occurs earlier than the formation of the FAK.Src kinase complex, suggesting that US28 activates Src before FAK. US28 binding to RANTES also promotes the formation of a Grb2.FAK complex, which is sensitive to treatment with the Src inhibitor PP2, further highlighting the critical role of Src in US28 activation of FAK. Human cytomegalovirus US28-mediated SMC migration is inhibited by treatment with PP2 and through the expression of either of two dominant negative inhibitors of FAK (F397Y and NH2-terminal amino acids 1-401). These findings demonstrate that activation of FAK and Src plays a critical role in US28-mediated signaling and SMC migration.
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D002460:Cell Line; D002465:Cell Movement; D003587:Cytomegalovirus / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D051416:Focal Adhesion Protein-Tyrosine Kinases; D008024:Ligands; D008954:Models, Biological; D008957:Models, Genetic; D009130:Muscle, Smooth / Q000166:cytology*; D009154:Mutation; D011233:Precipitin Tests; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D019707:Receptors, Chemokine / Q000737:chemistry*; D015398:Signal Transduction; D013997:Time Factors; D014764:Viral Proteins / Q000737:chemistry*; D019061:src-Family Kinases / Q000378:metabolism*
chemical_list: D008024:Ligands; D019707:Receptors, Chemokine; C411191:US28 receptor, Cytomegalovirus; D014764:Viral Proteins; D011505:Protein-Tyrosine Kinases; D051416:Focal Adhesion Protein-Tyrosine Kinases; D019061:src-Family Kinases