calcium liberation

1-Oleoyl lysophosphatidic acid is a species of lysophosphatidic acid (LPA) containing oleic acid at the sn-1 position. Phosphatidic acid is produced either directly through the action of phospholipase D (PLD) or through a two step process involving liberation of diacylglycerol (DAG) by phospholipase C (PLC) followed by phosphorylation of DAG by diglycerol kinase.[1] Hydrolysis of the fatty acid at the sn-2 position by phospholipase A2 (PLA2) yields bioactive LPA. LPA binds to one of five different G protein linked receptors to mediate a variety of biological responses including cell proliferation, smooth muscle contraction, platelet aggregation, neurite retraction, and cell motility.[2],[1] 1-Oleoyl lysophosphatidic acid is the most potent of the LPA analogs for calcium mobilization in A431 cells and for growth stimulation of a variety of cell lines.[3],[4]

Setipiprant (ACT-129968) is an orally available, selective CRTH2 antagonist (IC50: 6.0 nM). CRTH2, a G protein-coupled receptor for prostaglandin (PGD2), mediates key inflammatory responses related to allergy and asthma. PGD2, produced by mast cells, binds to CRTH2 on blood-borne cells, inducing chemotaxis of Th2 cells, basophils, and eosinophils, and stimulating cytokine release.