Platelet clearance via shear-induced unfolding of a membrane mechanoreceptor.
Identifieur interne : 001915 ( PubMed/Curation ); précédent : 001914; suivant : 001916Platelet clearance via shear-induced unfolding of a membrane mechanoreceptor.
Auteurs : Wei Deng [États-Unis] ; Yan Xu [États-Unis] ; Wenchun Chen [États-Unis] ; David S. Paul [États-Unis] ; Anum K. Syed [États-Unis] ; Matthew A. Dragovich [États-Unis] ; Xin Liang [États-Unis] ; Philip Zakas [États-Unis] ; Michael C. Berndt [Australie] ; Jorge Di Paola [États-Unis] ; Jerry Ware [États-Unis] ; Francois Lanza [France] ; Christopher B. Doering [États-Unis] ; Wolfgang Bergmeier [États-Unis] ; X Frank Zhang [États-Unis] ; Renhao Li [États-Unis]Source :
- Nature communications [ 2041-1723 ] ; 2016.
Abstract
Mechanisms by which blood cells sense shear stress are poorly characterized. In platelets, glycoprotein (GP)Ib-IX receptor complex has been long suggested to be a shear sensor and receptor. Recently, a relatively unstable and mechanosensitive domain in the GPIbα subunit of GPIb-IX was identified. Here we show that binding of its ligand, von Willebrand factor, under physiological shear stress induces unfolding of this mechanosensory domain (MSD) on the platelet surface. The unfolded MSD, particularly the juxtamembrane 'Trigger' sequence therein, leads to intracellular signalling and rapid platelet clearance. These results illustrate the initial molecular event underlying platelet shear sensing and provide a mechanism linking GPIb-IX to platelet clearance. Our results have implications on the mechanism of platelet activation, and on the pathophysiology of von Willebrand disease and related thrombocytopenic disorders. The mechanosensation via receptor unfolding may be applicable for many other cell adhesion receptors.
DOI: 10.1038/ncomms12863
PubMed: 27670775
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<front><div type="abstract" xml:lang="en">Mechanisms by which blood cells sense shear stress are poorly characterized. In platelets, glycoprotein (GP)Ib-IX receptor complex has been long suggested to be a shear sensor and receptor. Recently, a relatively unstable and mechanosensitive domain in the GPIbα subunit of GPIb-IX was identified. Here we show that binding of its ligand, von Willebrand factor, under physiological shear stress induces unfolding of this mechanosensory domain (MSD) on the platelet surface. The unfolded MSD, particularly the juxtamembrane 'Trigger' sequence therein, leads to intracellular signalling and rapid platelet clearance. These results illustrate the initial molecular event underlying platelet shear sensing and provide a mechanism linking GPIb-IX to platelet clearance. Our results have implications on the mechanism of platelet activation, and on the pathophysiology of von Willebrand disease and related thrombocytopenic disorders. The mechanosensation via receptor unfolding may be applicable for many other cell adhesion receptors.</div>
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<Abstract><AbstractText>Mechanisms by which blood cells sense shear stress are poorly characterized. In platelets, glycoprotein (GP)Ib-IX receptor complex has been long suggested to be a shear sensor and receptor. Recently, a relatively unstable and mechanosensitive domain in the GPIbα subunit of GPIb-IX was identified. Here we show that binding of its ligand, von Willebrand factor, under physiological shear stress induces unfolding of this mechanosensory domain (MSD) on the platelet surface. The unfolded MSD, particularly the juxtamembrane 'Trigger' sequence therein, leads to intracellular signalling and rapid platelet clearance. These results illustrate the initial molecular event underlying platelet shear sensing and provide a mechanism linking GPIb-IX to platelet clearance. Our results have implications on the mechanism of platelet activation, and on the pathophysiology of von Willebrand disease and related thrombocytopenic disorders. The mechanosensation via receptor unfolding may be applicable for many other cell adhesion receptors.</AbstractText>
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