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- Josefsson, Emma C., et al.
(author)
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Consensus report on markers to distinguish procoagulant platelets from apoptotic platelets : communication from the Scientific and Standardization Committee of the ISTH
- 2023
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In: Journal of Thrombosis and Haemostasis. - : John Wiley & Sons. - 1538-7933 .- 1538-7836. ; 21:8, s. 2291-2299
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Journal article (peer-reviewed)abstract
- BACKGROUND: Procoagulant platelets are a subpopulation of highly activated platelets that promote coagulation through surface-exposed, negatively charged phospholipids, especially phosphatidylserine (PS). Procoagulant platelets are important for clot stabilization during haemostasis and an increased number of these platelets is associated with thrombotic risk. There is a need for harmonisation in this area since many of the markers and methods used to assess procoagulant platelets are not specific when used in isolation but are also associated with platelet apoptosis.OBJECTIVE: We initiated this project to identify a minimum set of markers and/or methods that can detect and distinguish procoagulant platelets from apoptotic platelets.METHODS AND RESULTS: The study design involved a primary panel with twenty-seven international experts participating in an online survey and moderated virtual focus group meetings. Primary and secondary panel members were then invited to provide input on themes and statements generated from the focus groups. This led to a recommendation to use flow cytometry and a combination of the following three surface markers to differentiate procoagulant from apoptotic platelets: P-selectin (CD62P), PS (recognized by annexin V), and a platelet-specific receptor GPIX (CD42a) or αIIb integrin (CD41, GPIIb).CONCLUSION: Procoagulant platelets are expected to be positive for all three markers, while apoptotic platelets will be positive for annexin V and the platelet specific surface receptor(s) but negative for P-selectin.
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- Rumjantseva, Viktoria, 1978, et al.
(author)
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Dual roles for hepatic lectin receptors in the clearance of chilled platelets.
- 2009
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In: Nature medicine. - : Springer Science and Business Media LLC. - 1546-170X .- 1078-8956. ; 15:11, s. 1273-80
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Journal article (peer-reviewed)abstract
- Rapid chilling causes glycoprotein-Ib (GPIb) receptors to cluster on blood platelets. Hepatic macrophage beta(2) integrin binding to beta-N-acetylglucosamine (beta-GlcNAc) residues in the clusters leads to rapid clearance of acutely chilled platelets after transfusion. Although capping the beta-GlcNAc moieties by galactosylation prevents clearance of short-term-cooled platelets, this strategy is ineffective after prolonged refrigeration. We report here that prolonged refrigeration increased the density and concentration of exposed galactose residues on platelets such that hepatocytes, through Ashwell-Morell receptor binding, become increasingly involved in platelet removal. Macrophages rapidly removed a large fraction of transfused platelets independent of their storage conditions. With prolonged platelet chilling, hepatocyte-dependent clearance further diminishes platelet recovery and survival after transfusion. Inhibition of chilled platelet clearance by both beta(2) integrin and Ashwell-Morell receptors may afford a potentially simple method for storing platelets in the cold.
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