Prostaglandins are critical lipid mediators involved in the wound healing response, with prostaglandin E2 (PGE2) being the most complex and exhibiting the most diverse physiological outputs.[3].
Prostaglandin E2 (PGE(2)) is the most abundant prostanoid in the human body, and synthesis of PGE(2) is driven by cyclooxygenase enzymes including COX-2. Both elevated expression of COX-2 and increased PGE(2) levels have been associated with many cancers including breast cancer[4].
Taprenepag (CP-544326) is a potent and selective prostaglandin EP(2) agonist with IC50s of 10 and 15 nM for human and rat EP2, respectively. Taprenepag shows selectivity for EP2 over other EP receptors (IC50s>3200 nM for EP1, EP3, and EP4) and a panel of 37 G protein-coupled receptors. Taprenepag (CP-544326) (0.01-1000 nM) increases cAMP levels in HEK293 cells expressing human EP2 (EC50=2.8 nM). CP-544326 was found to be a potent and selective EP(2) agonist (IC(50) = 10 nM; EC(50) = 2.8 nM) whose corneal permeability and ocular bioavailability were significantly increased when the compound was dosed as the isopropyl ester prodrug, PF-04217329[5].
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