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Absence of platelet-dependent fibrin formation in a patient with Scott syndrome

Wielders, Simone J. H., Broers, Jos, Cate, Hugo ten, Collins, Peter William, Bevers, Edouard M. and Lindhout, Theo 2009. Absence of platelet-dependent fibrin formation in a patient with Scott syndrome. Thrombosis and Haemostasis 102 (1) , pp. 76-82. 10.1160/TH08-11-0719

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To gain insight into the contribution of platelet-dependent thrombin formation in haemostasis and thrombosis, we investigated under flow conditions the haemostatic functions of platelets from a patient with Scott syndrome. Scott platelets are characterised by a diminished platelet-dependent thrombin generation. Thrombin generation was determined by calibrated automated thrombography and flow-based experiments were performed to reveal collagen-mediated platelet activation and fibrin deposition. Our studies indicate that adherent Scott platelets do not differ from control platelets in the formation of stable platelet aggregates under static and flow conditions. While for adherent control platelets a shape change, e.g. balloon formation, and externalisation of phosphatidylserine (PS) is associated with an increase in intracellular calcium concentration, this is not the case for Scott platelets. The calcium-induced morphological changes in control platelets are accompanied with a diminished recruitment of free flowing platelets. Scott platelets, not showing a calcium-induced shape change, also lost the ability to recruit free flowing platelets. These findings rebut the hypothesis that the mild bleeding tendency of Scott syndrome patients is due to a preserved adhesive activity of patient’s platelets. Perfusion of tissue factor (TF)-activated control blood over immobilised collagen results in the formation of fibrin fibers that radiate from platelet aggregates. Although platelet aggregates were also observed after perfusion with TF-activated Scott blood, fibrin deposition was not observed. In conclusion, our findings indicate that platelet adhesion and spreading on a collagen matrix in the absence of fibrin formation is sufficient to sustain haemostasis under non-traumatic conditions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > R Medicine (General)
R Medicine > RC Internal medicine
Uncontrolled Keywords: thrombin; Haemostasis; platelet physiology; fibrinogen; fibrin; Scott syndrome
Publisher: Schattauer
ISSN: 0340-6245
Last Modified: 04 Jun 2017 03:50

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