J Thromb Haemost. 2021 Nov 24; doi: 10.1111/jth.15598. Epub 2021 Nov 24.
Osteoprotegerin modulates platelet adhesion to von Willebrand factor during release from endothelial cells.
Journal of thrombosis and haemostasis : JTH
Nikolett Wohner, Silvie Sebastian, Vincent Muczynski, Dana Huskens, Bas de Laat, Philip G de Groot, Peter J Lenting
Affiliations
Affiliations
- Laboratory for Hemostasis, Inflammation & Thrombosis, Unité Mixed de Recherche 1176, Institut National de la Santé et de la Recherche Médicale, Université Paris-Saclay, Le Kremlin-Bicêtre, France.
- Department of Clinical Chemistry and Haematology, Utrecht Medical Centre, Utrecht, The Netherlands.
- Synapse Research Institute, Maastricht, The Netherlands.
- CARIM, Maastricht University Medical Centre, Maastricht, The Netherlands.
PMID: 34816579
DOI: 10.1111/jth.15598
Abstract
BACKGROUND: Platelet-binding Von Willebrand Factor (VWF) strings assemble upon stimulated secretion from endothelial cells.
OBJECTIVES: To investigate the efficiency of platelet binding to multi-molecular VWF bundles secreted from endothelial cells and to investigate the role of osteoprotegerin, a protein located in Weibel-Palade bodies that interacts with the VWF platelet binding domain.
METHODS: The nanobody VWF/AU-a11 that specifically binds to VWF in its active platelet-binding conformation was used to investigate the conformation of VWF.
RESULTS: Upon stimulated secretion from endothelial cells, VWF strings were only partially covered with platelets, while a VWD-type 2B mutation or ristocetin enhanced platelet binding by 2-3-fold. Osteoprotegrin, reduces platelet adhesion to VWF by 40% ± 18% in perfusion assays. siRNA-mediated down-regulation of endothelial osteoprotegerin expression resulted in a 1.8-fold increase in platelet adhesion to VWF strings. Upon viral infection, there is a concordant rise in VWF and osteoprotegerin plasma levels. Unexpectedly, no such increase was observed in plasma of desmopressin-treated hemophilia A-patients. In a mouse model, osteoprotegerin expression was low in liver endothelial cells of vehicle-treated mice, and concanavalin A-treatment increased VWF and osteoprotegerin expression 4- and 40-fold, respectively. This increase was translated in a 30-fold increased osteoprotegerin/VWF ratio in plasma.
CONCLUSIONS: Release of VWF from endothelial cells opens the platelet-binding site, irrespective of the presence of flow. However, not all available platelet-binding sites are being occupied, suggesting some extent of regulation. Part of this regulation involves endothelial proteins that are co-secreted with VWF, like osteoprotegerin. This regulatory mechanism may be of more relevance under inflammatory conditions.
© 2021 International Society on Thrombosis and Haemostasis.
Keywords: blood platelets; endothelial cells; inflammation; osteoprotegerin; von Willebrand factor
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