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Official Journal of the , the International Union of Phlebology and the
Indexed/Abstracted in: BIOSIS Previews, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 0,899
Online ISSN 1827-1839
Goto S., Ichikawa N., Lee M., Goto M., Sakai H., Kim J.-J., Yoshida M., Handa M. *, Ikeda Y. **, Handa S.
From the Division of Cardiology, Tokai University School of Medicine, Isehara, Japan
* Blood Center and ** Department of Medicine, Keio University School of Medicine, Tokyo, Japan
Background. P-selectin is known to play a crucial role in leucocyte recruitment at sites of vascular injury. Although platelet surface expression of P-selectin molecules are well known to occur after platelet stimulation by chemical agonists such as α-thrombin, it is still uncertain whether P-selectin expression occurs in the process of the more physiological platelet activation pathway mediated by interaction between von Willebrand factor (vWF) and platelet receptor proteins, including glycoprotein (GP) Ibα and GP IIb/IIIa, occurring under high shear rates generated by blood flow.
Methods. We have developed a method to detect P-selectin molecules expressed on platelet surface with flow-cytometer and monoclonal antibody, which can bind exclusively to P-selectin (WGA1), directly conjugated with fluorescein isothiocynate. This method allowed us to measure platelet surface P-selectin molecules semi-quantitatively.
Results. We demonstrated that a significant increase in platelet surface P-selectin molecules occurred after exposing platelets to a relatively high shear rate of 10,800 s-1. We have also demonstrated that shear-induced surface expression of P-selectin as well as microparticle release from platelets depended at least on the interaction between von Willebrand factor and glycoprotein Ibα, a platelet surface receptor for the former.
Conclusions. Shear-induced von Willebrand-factor mediated surface expression of P-selectin may play a role in leucocyte recruitment in platelet thrombi at vascular injury sites.