Lead Optimization of P5U and Urantide: Discovery of Novel Potent Ligands at the Urotensin-II Receptor

We have optimized 1 (P5U) and urantide, two important ligands at the h-UT receptor, designing several analogues by the exchange of the Tyr9 residue with different unnatural aromatic amino acids. This study allowed us to discover novel ligands with improved activity. In particular, the replacement of...

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Veröffentlicht in:Journal of medicinal chemistry 2014-07, Vol.57 (14), p.5965-5974
Hauptverfasser: Carotenuto, Alfonso, Auriemma, Luigia, Merlino, Francesco, Yousif, Ali Munaim, Marasco, Daniela, Limatola, Antonio, Campiglia, Pietro, Gomez-Monterrey, Isabel, Santicioli, Paolo, Meini, Stefania, Maggi, Carlo A, Novellino, Ettore, Grieco, Paolo
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container_end_page 5974
container_issue 14
container_start_page 5965
container_title Journal of medicinal chemistry
container_volume 57
creator Carotenuto, Alfonso
Auriemma, Luigia
Merlino, Francesco
Yousif, Ali Munaim
Marasco, Daniela
Limatola, Antonio
Campiglia, Pietro
Gomez-Monterrey, Isabel
Santicioli, Paolo
Meini, Stefania
Maggi, Carlo A
Novellino, Ettore
Grieco, Paolo
description We have optimized 1 (P5U) and urantide, two important ligands at the h-UT receptor, designing several analogues by the exchange of the Tyr9 residue with different unnatural aromatic amino acids. This study allowed us to discover novel ligands with improved activity. In particular, the replacement of the Tyr9 residue by (pCN)Phe or (pNO2)Phe within the urantide sequence led to compounds 13 (UPG-83) and 15 (UPG-95), respectively, which showed pure antagonist activity toward UT receptor in a rat aorta bioassay. More interestingly, the replacement of the Tyr9 in 1 sequence with the Btz or the (3,4-Cl)Phe residues led to superagonists 6 (UPG-100) and 10 (UPG-92) with pEC50 values at least 1.4 log higher than that of 1, being the most potent UT agonists discovered to date. Compounds 10 and 13 showed also a good stability in a serum proteolytic assay. These ligands represent new useful tools to further characterize the urotensinergic system in human physiopathology.
doi_str_mv 10.1021/jm500218x
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Med. Chem</addtitle><description>We have optimized 1 (P5U) and urantide, two important ligands at the h-UT receptor, designing several analogues by the exchange of the Tyr9 residue with different unnatural aromatic amino acids. This study allowed us to discover novel ligands with improved activity. In particular, the replacement of the Tyr9 residue by (pCN)Phe or (pNO2)Phe within the urantide sequence led to compounds 13 (UPG-83) and 15 (UPG-95), respectively, which showed pure antagonist activity toward UT receptor in a rat aorta bioassay. More interestingly, the replacement of the Tyr9 in 1 sequence with the Btz or the (3,4-Cl)Phe residues led to superagonists 6 (UPG-100) and 10 (UPG-92) with pEC50 values at least 1.4 log higher than that of 1, being the most potent UT agonists discovered to date. Compounds 10 and 13 showed also a good stability in a serum proteolytic assay. 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subjects Dose-Response Relationship, Drug
Drug Discovery
Humans
Ligands
Models, Molecular
Molecular Conformation
Peptide Fragments - chemical synthesis
Peptide Fragments - chemistry
Peptide Fragments - pharmacology
Peptides, Cyclic - chemical synthesis
Peptides, Cyclic - chemistry
Peptides, Cyclic - pharmacology
Receptors, G-Protein-Coupled - antagonists & inhibitors
Receptors, G-Protein-Coupled - metabolism
Structure-Activity Relationship
Urotensins - chemical synthesis
Urotensins - chemistry
Urotensins - pharmacology
title Lead Optimization of P5U and Urantide: Discovery of Novel Potent Ligands at the Urotensin-II Receptor
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