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Original

Endogenous Mechanisms of Inhibition of Platelet Function

, MA, , MD, PhD & , MD, PhD
Pages 247-258 | Received 18 Jun 2004, Accepted 02 Aug 2004, Published online: 10 Jul 2009
 

Abstract

Platelets play an important role in coagulation, in maintenance of hemostasis, and in the pathophysiology of thrombotic diseases. In response to blood vessel injury, platelets accumulate at the site, recruit other platelets, promote clotting, and form a hemostatic plug to prevent hemorrhage. By contrast, several inhibitory mechanisms modulate platelet function and act in a synergistic manner to prevent pathologic thrombus formation. This review focuses on the principal endogenous inhibitors of platelet function and the central role of the normal endothelium in these inhibitory processes. The main endothelium-derived platelet inhibitors include nitric oxide, prostacyclin, and Ecto-ADPase/CD39/NTPDase. Each of these factors is discussed in turn, and the specific mechanisms by which they inhibit platelet function are reviewed.

This work was supported by National Institutes of Health grantsHL55993, HL58976, and HL61795 to JL.

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