Platelet endothelial cell adhesion molecule-1 is a major SH-PTP2 binding protein in vascular endothelial cells.
Platelet endothelial cell adhesion molecule-1 (PECAM-1, CD31) is rapidly tyrosine phosphorylated in mechanically stimulated vascular endothelial cells (ECs). A 65-kDa protein from ECs specifically bound to the c-Src phosphorylated PECAM-1 cytoplasmic domain and was identified as a protein tyrosine phosphatase SH-PTP2 (SHP2, Syp). PECAM-1 was coimmunoprecipitated by anti-SH-PTP2 from EC extracts as a major binding protein, and the level of association increased when PECAM-1 was tyrosine phosphorylated. This association was mediated by SH2 domains of SH-PTP2. A rapid translocation of SH-PTP2 into cell-cell adhesion sites, where PECAM-1 was localized, occurred in mechanically stimulated cells. Our results suggest that PECAM-1 is a component of a mechanosensing machinery acting upstream of SH-PTP2.
Masuda
M
M
Department of Structural Analysis, National Cardiovascular Center Research Institute, Suita, Osaka, Japan. masuda61@ri.ncvc.go.jp
Osawa
M
M
Shigematsu
H
H
Harada
N
N
Fujiwara
K
K
D000818:Animals; D001665:Binding Sites; D002417:Cattle; D002448:Cell Adhesion; D002478:Cells, Cultured; D006801:Humans; D007365:Intercellular Junctions / Q000378:metabolism / Q000648:ultrastructure; D047908:Intracellular Signaling Peptides and Proteins; D008970:Molecular Weight; D009131:Muscle, Smooth, Vascular / Q000378:metabolism*; D010446:Peptide Fragments / Q000737:chemistry; D010766:Phosphorylation; D019000:Phosphotyrosine / Q000032:analysis; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000302:isolation & purification / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases; D014443:Tyrosine / Q000378:metabolism; D018909:src Homology Domains
D047908:Intracellular Signaling Peptides and Proteins; D010446:Peptide Fragments; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D011993:Recombinant Fusion Proteins; D019000:Phosphotyrosine; D014443:Tyrosine; C516724:PTPN11 protein, human; C509249:PTPN6 protein, human; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases; D054593:SH2 Domain-Containing Protein Tyrosine Phosphatases