Platelet Isolation and Activation Assays

Thrombin and platelet activation.

The accumulation of thrombin at sites of vascular injury provides one of the chief means for recruiting platelets into a growing hemostatic plug. Studies completed over the past 10 years show that platelet responses to thrombin are mediated by a subset of G protein-coupled receptors known as protease-activated receptors. These receptors are activated on cleavage by thrombin, initiating the intr...

Platelet activation and atherothrombosis.

Copyright © 2007 Massachusetts Medical Society. Platelets are essential for primary hemostasis and repair of the endothelium, but they also play a key role in the development of acute coronary syndromes and contribute to cerebrovascular events. In addition, they participate in the process of forming and extending atherosclerotic plaques. Atherosclerosis is a chronic inflammatory process,1 and i...

Platelet PAR1 receptor density--correlation to platelet activation response and changes in exposure after platelet activation.

INTRODUCTION A polymorphism (-14 A/T) affecting PAR1 expression on the platelet surface has recently been identified. A two-fold variation in receptor density, which correlated with the platelet response to PAR1-activating peptide (PAR1-AP), has been reported. MATERIALS AND METHODS We used flow cytometry to measure the correlation between the number of PAR1 receptors and platelet activation. ...

Human platelet actin. Isolation and properties.

Platelet activation and blood coagulation.

Platelet activation and blood coagulation are complementary, mutually dependent processes in haemostasis and thrombosis. Platelets interact with several coagulation factors, while the coagulation product thrombin is a potent platelet-activating agonist. Activated platelets come in a procoagulant state after a prolonged elevation in cytosolic [Ca2+]i. Such platelets, e.g. when adhering to collag...