title: Novel association of the src family kinases, hck and c-fgr, with CCR3 receptor stimulation: A possible mechanism for eotaxin-induced human eosinophil chemotaxis.
abstract: The chemokine eotaxin is a potent and relatively eosinophil-specific chemoattractant implicated in the cell migration to inflammatory sites in allergic diseases. Eotaxin exerts its activity solely through the CCR3 receptor, but the signaling pathways are poorly defined. In this study, we show that eotaxin induces an increase in tyrosine phosphorylation of multiple cellular proteins in normal human eosinophils. Eotaxin-dependent tyrosine phosphorylation was detected 1 min after stimulation and increased for at least 15 min with kinetics similar to those of eotaxin-induced cell shape changes. Herbimycin A, a tyrosine kinase inhibitor, blocked both eotaxin-induced tyrosine phosphorylation and cell shape changes as well as chemotaxis. Immunofluorescence microscopy analyses showed that eotaxin-induced cell shape changes were accompanied by redistribution of tyrosine-phosphorylated proteins and F-actin reorganization that were sensitive to herbimycin A. Coimmunoprecipitation studies revealed that binding of eotaxin to CCR3 greatly enhanced association of the Src family kinases, Hck and c-Fgr, with CCR3 after internalization of CCR3. These results may indicate that recruitment of Hck and c-Fgr to CCR3 in a compartment triggers tyrosine phosphorylation, leading to rapid cell shape changes required for cell migration.
authors.affiliation: Department of Otorhinolaryngology and Head and Neck Surgery, Kumamoto University School of Medicine, Honjo 1-1-1, Kumamoto, 860, Japan. 106726.2140@compuserve.com
authors.forename: A
authors.initials: A
authors.lastname: El-Shazly
authors.forename: N
authors.initials: N
authors.lastname: Yamaguchi
authors.forename: K
authors.initials: K
authors.lastname: Masuyama
authors.forename: T
authors.initials: T
authors.lastname: Suda
authors.forename: T
authors.initials: T
authors.lastname: Ishikawa
mesh_terms: D016227:Benzoquinones; D054413:Chemokine CCL11; D019742:Chemokines, CC; D002634:Chemotaxis, Leukocyte / Q000187:drug effects / Q000502:physiology*; D016207:Cytokines / Q000502:physiology; D004357:Drug Synergism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004804:Eosinophils / Q000187:drug effects / Q000378:metabolism* / Q000502:physiology; D006801:Humans; D047029:Lactams, Macrocyclic; D010766:Phosphorylation / Q000187:drug effects; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D051572:Proto-Oncogene Proteins c-hck; D011809:Quinones / Q000494:pharmacology; D054397:Receptors, CCR3; D019707:Receptors, Chemokine / Q000378:metabolism*; D017828:Rifabutin / Q000031:analogs & derivatives; D014443:Tyrosine / Q000378:metabolism; D014638:Vanadates / Q000494:pharmacology; D019061:src-Family Kinases / Q000378:metabolism*
chemical_list: D016227:Benzoquinones; C515456:CCL11 protein, human; C515350:CCR3 protein, human; D054413:Chemokine CCL11; D019742:Chemokines, CC; D016207:Cytokines; D004791:Enzyme Inhibitors; D047029:Lactams, Macrocyclic; D011518:Proto-Oncogene Proteins; D011809:Quinones; D054397:Receptors, CCR3; D019707:Receptors, Chemokine; C076715:pervanadate; D017828:Rifabutin; D014638:Vanadates; D014443:Tyrosine; C020754:herbimycin; D011505:Protein-Tyrosine Kinases; C496631:HCK protein, human; D051572:Proto-Oncogene Proteins c-hck; C053102:proto-oncogene proteins c-fgr; D019061:src-Family Kinases