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Urantide mimics urotensin-II induced calcium release in cells expressing recombinant UT receptors

Valeria Camarda, Wei Song, Erika Marzola, Martina Spagnol, Remo Guerrini, Severo Salvadori, Domenico Regoli, Jonathan P Thompson, David J Rowbotham, David J Behm, Stephen A Douglas, Girolamo Calo', David G Lambert
European Journal of Pharmacology 2004 September 13, 498 (1): 83-6
15363979
Urotensin-II is the natural ligand of the UT receptor. This novel system is involved in the regulation of cardiovascular functions. Recently, a urotensin-II analog ([Pen5,DTrp7,Orn8]urotensin-II(4-11)) named urantide, has been proposed as a selective and potent UT receptor antagonist. In order to pharmacologically characterize this new compound, urantide was tested on the native UT receptors of the rat aorta and on the human recombinant receptors expressed in CHO cells (CHO(hUT)). Indeed, urantide behaves as a competitive, potent (pA2 8.24), and pure antagonist in the rat aorta bioassay, while as an agonist (pEC50 8.11) in a calcium mobilization assay performed in CHO(hUT) cells. Urantide should be considered a low efficacy partial agonist.

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