Platelet activation signaling pathway

The platelet activation pathway is a complex network of signaling events triggered by various agonists including thrombin, ADP, thromboxane A2, collagen, and von Willebrand factor. These agonists bind to specific receptors on platelets, initiating intracellular signaling cascades that converge on common effectors like phospholipase C, leading to calcium mobilization, granule secretion, and integrin activation. This ultimately results in platelet shape change, adhesion, aggregation, and thrombus formation. The pathway involves multiple receptor families, G-proteins, kinases, and second messengers, making it a sophisticated system with built-in amplification and synergy between different activation mechanisms. Due to its central role in thrombosis, the platelet activation pathway contains numerous therapeutic targets for the prevention and treatment of cardiovascular diseases.

Other names

Platelet activation cascadePlatelet signaling pathwayPlatelet-dependent thrombosis pathway

P2Y12 inhibitors block ADP-mediated platelet activation and aggregation. Glycoprotein IIb/IIIa inhibitors prevent fibrinogen binding and platelet aggregation.