title: Sphingosine 1-phosphate induces platelet/endothelial cell adhesion molecule-1 phosphorylation in human endothelial cells through cSrc and Fyn.
abstract: Sphingosine 1-phosphate (S1P) is a multifunctional phospholipid which acts through a specific family of G protein-coupled receptors. Platelet/endothelial cell adhesion molecule-1 (PECAM-1) form trans-homophilic binding at lateral cell border. Upon stimulation, its cytoplasmic tyrosine residues could be phosphorylated and interact with various downstream signaling molecules. In this study, we demonstrated that S1P induced PECAM-1 tyrosine phosphorylation in human umbilical cord vein cells (HUVECs). By pharmacological inhibitors, it was suggested that G(i) and Src family kinases were involved in PECAM-1 phosphorylation. Moreover, cSrc and Fyn siRNA significantly suppressed S1P-induced PECAM-1 phosphorylation. These results suggested that S1P-induced PECAM-1 phosphorylation through G(i) and subsequent cSrc and Fyn. Our findings provide further understanding of S1P and PECAM-1 signaling as well as their functions in endothelial cells.
authors.affiliation: Institute of Zoology, National Taiwan University, No 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan, ROC.
authors.forename: Yu-Ting
authors.initials: YT
authors.lastname: Huang
authors.forename: Shee-Uan
authors.initials: SU
authors.lastname: Chen
authors.forename: Chia-Hong
authors.initials: CH
authors.lastname: Chou
authors.forename: Hsinyu
authors.initials: H
authors.lastname: Lee
mesh_terms: D002463:Cell Membrane Permeability; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000187:drug effects / Q000201:enzymology* / Q000378:metabolism; D004730:Endothelium, Vascular / Q000166:cytology; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000378:metabolism; D006801:Humans; D008246:Lysophospholipids / Q000494:pharmacology*; D010766:Phosphorylation; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000378:metabolism*; D051076:Proto-Oncogene Proteins c-fyn / Q000378:metabolism*; D016392:Proto-Oncogene Proteins pp60(c-src) / Q000378:metabolism*; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D008246:Lysophospholipids; D019408:Platelet Endothelial Cell Adhesion Molecule-1; C060506:sphingosine 1-phosphate; D051076:Proto-Oncogene Proteins c-fyn; D016392:Proto-Oncogene Proteins pp60(c-src); D019206:GTP-Binding Protein alpha Subunits, Gi-Go; D013110:Sphingosine