Platelet activation cascade

The platelet activation cascade is a multi-step biological process that transforms platelets from a resting to an active state at sites of vascular injury, facilitating blood clot formation. It is initiated by exposure to factors like collagen and von Willebrand factor, leading to platelet adhesion, activation, granule release (ADP, serotonin, thromboxane A2), and aggregation via GPIIb/IIIa-fibrinogen bridges. This process is vital for normal hemostasis but, when dysregulated, contributes to pathologies such as thrombosis or bleeding disorders. Antiplatelet drugs act on various steps of this cascade to modulate thrombosis risk[1][5][3].

Other names

Platelet activation pathwayPlatelet activation processPlatelet plug formation

inhibition of cyclooxygenase-1 (COX-1) to decrease thromboxane A2 (aspirin)[5], antagonism of ADP P2Y12 receptors (clopidogrel, prasugrel, ticagrelor)[3], inhibition of GPIIb/IIIa (abciximab, eptifibatide, tirofiban)[3][5]