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. 1981 Aug;78(8):5180–5184. doi: 10.1073/pnas.78.8.5180

Subcellular localization and secretion of factor V from human platelets.

C M Chesney, D Pifer, R W Colman
PMCID: PMC320365  PMID: 6946465

Abstract

Factor V, a plasma protein cofactor necessary for optimal conversion of prothrombin to thrombin, is also present in considerable concentration in blood platelets (9.9 units per 10(9) platelets). Subcellular fractionation by two methods has localized factor V in the alpha granules of unstimulated platelets. ADP and epinephrine cause release of 4.6% and 6.4%, respectively, of the total factor V, a process completely inhibited by cyclooxygenase alkylation by aspirin. In contrast, collagen causes release of 25% of platelet factor V, a process only partially suppressed by aspirin. Secretion of factor V depends on the availability of metabolic energy, because antimycin A, an inhibitor of aerobic metabolism, and 2-deoxyglucose, an inhibitor of anaerobic glycolysis, together almost totally inhibited the secretion of factor V induced by collagen. The data establish that factor V is not normally available on unstimulated platelets but can be secreted from alpha granules upon stimulation with physiological agents such as ADP, epinephrine, and collagen. Because factor V is known to serve as a receptor for factor Xa, the exposure of factor V on platelets consequent to release would accelerate the process of blood coagulation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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