540769-28-6

Palosuran is an antagonist of the urotensin II receptor (UTR; IC₅₀s = 3.6 and 1,475 nM for CHO cell membranes expressing human and rat recombinant receptors, respectively). It inhibits contraction of isolated rat aortic rings induced by urotensin II (Item Nos. 24711 | 24753) in a concentration-dependent manner. Palosuran (300 mg/kg twice per day) reduces plasma endothelin-1 (Item No. 24127), urotensin II, and TGF-β1 levels, as well as the main pulmonary arterial pressure and right ventricular hypertrophy index in a rat model of pulmonary arterial hypertension (PAH) induced by monocrotaline (Item No. 16666). Palosuran (300 mg/kg per day) reduces serum glucose, cholesterol, and triglyceride levels and increases survival in a rat model of diabetes induced by streptozotocin (STZ; Item No. 13104). It also decreases albuminuria and global kidney lesion scores in STZ-induced diabetic rats.

Palosuran (ACT-058362) is a potent, selective, and orally active antagonist of urotensin II receptor, with an IC50 of 3.6 nM for CHO cell membranes expressing human recombinant receptors. Palosuran can improves pancreatic and renal function in diabetic rats[1][2].

[1] Clozel M, et al. Pharmacology of the urotensin-II receptor antagonist palosuran (ACT-058362; 1-[2-(4-benzyl-4-hydroxy-piperidin-1-yl)-ethyl]-3-(2-methyl-quinolin-4-yl)-urea sulfate salt): first demonstration of a pathophysiological role of the urotensin System. J Pharmacol Exp Ther. 2004 Oct;311(1):204-12. DOI:10.1124/jpet.104.068320
[2] Clozel M, et al. The urotensin-II receptor antagonist palosuran improves pancreatic and renal function in diabetic rats. J Pharmacol Exp Ther. 2006 Mar;316(3):1115-21. DOI:10.1124/jpet.105.094821