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Volume 272, Number 11, Issue of March 14, 1997 pp. 6986-6993
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

The Protein-tyrosine Phosphatase SHP-2 Binds Platelet/Endothelial Cell Adhesion Molecule-1 (PECAM-1) and Forms a Distinct Signaling Complex during Platelet Aggregation
EVIDENCE FOR A MECHANISTIC LINK BETWEEN PECAM-1- AND INTEGRIN-MEDIATED CELLULAR SIGNALING

(Received for publication, October 2, 1996, and in revised form, January 7, 1997)

Denise E. Jackson Dagger , Christopher M. Ward Dagger , Ronggang Wang Dagger and Peter J. Newman Dagger §

From the Dagger  Blood Research Institute, Blood Center of Southeastern Wisconsin, Milwaukee, Wisconsin 53233-2121 and the § Departments of Cellular Biology and Pharmacology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226

Platelet/endothelial cell adhesion molecule-1 (PECAM-1) is a homophilic adhesion receptor that mediates leukocyte/endothelial cell interactions that take place during transendothelial migration. Recent reports have shown that the binding of certain anti-PECAM-1 antibodies results in up-regulation of integrin function on the surface of leukocytes and platelets, suggesting that PECAM-1 may be capable of transmitting information into the cell following its engagement. PECAM-1 isolated from resting or activated but nonaggregated platelets was phosphorylated predominantly on serine residues; however, PECAM-1 derived from activated, aggregated platelets was strongly phosphorylated on tyrosine. Synthetic tyrosine-phosphorylated peptides derived from five different regions within the cytoplasmic domain of PECAM-1 were screened for their ability to associate with cytoplasmic signaling molecules. The protein-tyrosine phosphatase SHP-2 was found to interact specifically with two different PECAM-1 phosphopeptides containing highly conserved phosphatase-binding motifs on PECAM-1 with the sequences VQpY663TEV and TVpY686SEV. More important, SHP-2 bound not only PECAM-1 phosphopeptides, but also became associated with full-length cellular PECAM-1 during the platelet aggregation process, and this interaction was mediated by the amino-terminal Src homology 2 domains of the phosphatase. Since SHP-2 normally serves as a positive regulator of signal transduction, its association with activated PECAM-1 suggests a number of potential mechanisms by which PECAM-1 engagement might be coupled to integrin activation in vascular cells.


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