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First published online July 13, 2004
doi: 10.1242/10.1242/jcs.01325
Commentary |
School of Animal and Microbial Sciences, The University of Reading, Whiteknights, PO Box 228, Reading, Berkshire, RG6 6AJ, UK
(e-mail: j.m.gibbins{at}reading.ac.uk)
Platelets perform a central role in haemostasis and thrombosis. They adhere to subendothelial collagens exposed at sites of blood vessel injury via the glycoprotein (GP) Ib-V-IX receptor complex, GPVI and integrin 
2ß1. These receptors perform distinct functions in the regulation of cell signalling involving non-receptor tyrosine kinases (e.g. Src, Fyn, Lyn, Syk and Btk), adaptor proteins, phospholipase C and lipid kinases such as phosphoinositide 3-kinase. They are also coupled to an increase in cytosolic calcium levels and protein kinase C activation, leading to the secretion of paracrine/autocrine platelet factors and an increase in integrin receptor affinities. Through the binding of plasma fibrinogen and von Willebrand Factor to integrin IIbß3, a platelet thrombus is formed. Although increasing evidence indicates that each of the adhesion receptors GPIb-V-IX and GPVI and integrins 2ß1 and IIbß3 contribute to the signalling that regulates this process, the individual roles of each are only beginning to be dissected. By contrast, adhesion receptor signalling through platelet endothelial cell adhesion molecule 1 (PECAM-1) is implicated in the inhibition of platelet function and thrombus formation in the healthy circulation. Recent studies indicate that understanding of platelet adhesion signalling mechanisms might enable the development of new strategies to treat and prevent thrombosis.
Key words: Glycoprotein, GPIb-V-IX, GPVI, Integrin, Platelet endothelial cell adhesion molecule 1, PECAM-1
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