Journal
FEBS LETTERS
Volume 580, Issue 22, Pages 5313-5320Publisher
WILEY
DOI: 10.1016/j.febslet.2006.08.082
Keywords
actin cytoskeleton; calpain; integrin alpha IIb beta 3; microparticles; procoagulant activity
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Platelet activation by potent, Ca2+-mobilizing agonists results in shedding of microparticles that are active in coagulation. Here we show that platelets under storage produce procoagulant microparticles in the absence of agonist. Microparticle formation by resting platelets results from alpha IIb beta 3 signaling to destabilization of the actin cytoskeleton in the absence of calpain activation. Integrin-mediated spreading of platelets over fibrinogen similarly results in microparticle formation. After transfusion of stored platelet preparations to thrombocytopenic patients, the microparticles contribute to coagulant activity in vivo. (c) 2006 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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