Arachidonic Acid

Arachidonic Acid (CAS No.: 506-32-1) is a polyunsaturated omega-6 essential fatty acid that serves as a critical structural component of membrane phospholipids and a central bioactive lipid in cellular signaling. Endogenously derived from dietary linoleic acid and abundantly present in animal tissues such as brain, liver, and glandular organs, it exists predominantly esterified within biomembranes, where its regulated release by phospholipase enzymes generates free arachidonate for downstream metabolism. This liberated form functions as a key substrate for cyclooxygenase, lipoxygenase, and cytochrome P450 pathways, leading to the production of eicosanoid mediators including prostaglandins, thromboxanes, and leukotrienes that orchestrate inflammatory responses, vascular tone, and immune signaling. Through its involvement in receptor-stimulated lipid signaling cascades and second messenger generation, arachidonic acid plays a pivotal role in modulating processes such as cell proliferation, differentiation, and apoptosis. In vitro, its biological activity is typically observed across nanomolar to micromolar concentration ranges depending on the assay system and enzymatic context. Widely utilized in biomedical research, arachidonic acid is employed in cell-based models to study inflammation, oxidative stress, and lipid metabolism, as well as in pharmacological screening of enzyme inhibitors targeting eicosanoid biosynthesis; experimental concentrations or dosing regimens vary according to specific study designs and objectives.