Arachidonic acid production pathway in platelets (AA pathway)

The arachidonic acid production pathway in platelets is a fundamental biochemical sequence that governs the release of arachidonic acid from the cell membrane and its subsequent conversion into bioactive eicosanoids. Upon platelet stimulation by agonists such as thrombin or collagen, cytosolic phospholipase A2 (cPLA2) is activated to liberate arachidonic acid from membrane phospholipids (StatPearls, 2023). This free arachidonic acid serves as the substrate for cyclooxygenase-1 (COX-1), leading to the synthesis of thromboxane A2 (TXA2), which is a powerful mediator of platelet aggregation and vascular contraction (PubMed, PMC3547677). Pharmacological modulation of this pathway is a cornerstone of cardiovascular medicine, particularly through the use of low-dose aspirin to prevent arterial thrombosis (NIH, 2022). Because this pathway is essential for normal hemostasis, its inhibition carries a significant risk of bleeding complications.

Other names

Arachidonic acid cascadeEicosanoid biosynthetic pathwayPhospholipase A2-mediated arachidonic acid releasePlatelet arachidonate metabolism

Inhibition of enzymes within the pathway, such as phospholipase A2 or cyclooxygenase-1, to reduce the production of pro-thrombotic mediators like thromboxane A2 (StatPearls, 2023).