KAG-308 is an effective selective and orally active agonist of the EP4 receptor (Ki: 2.57 nM and EC50: 17 nM for human EP4 receptor), more selective over EP1, EP2, EP3, and IP receptor. KAG-308 suppresses colitis and promotes histological mucosal healing,
Butaprost is a chemical compound that functions as a selective agonist for the prostaglandin E receptor (EP2). It exhibits an EC50 of 33 nM and a Ki of 2.4 μM when interacting with the murine EP2 receptor. However, Butaprost demonstrates lower activity against murine EP1, EP3, and EP4 receptors. Furthermore, it effectively attenuates fibrosis by inhibiting the TGF-β Smad2 signaling pathway [1] [2] [3].