Using conformational constraints at position 6 of Angiotensin II to generate compounds with enhanced AT2R selectivity and proteolytic stability

Dirk Tourwé, Antonis D. Tsiailanis, Nikolaos Parisis, Baydaa Hirmiz, Mark Del Borgo, Marie Isabel Aguilar, Olivier Van der Poorten, Steven Ballet, Robert E. Widdop, Andreas G. Tzakos

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Abstract

The Renin-Angiotensin System (RAS) plays a crucial role in numerous pathological conditions. Two of the critical RAS players, the angiotensin receptors AT1R and AT2R, possess differential functional profiles, although they share high sequence similarity. Although the main focus has been placed on AT1R, several epidemiological studies have evidenced that activation of AT2R could operate as a multimodal therapeutic target for different diseases. Thus, the development of selective AT2R ligands could have a high clinical potential for different therapeutic directions. Furthermore, they could serve as a powerful tool to interrogate the molecular mechanisms that are mediated by AT2R. Based on our recently established high affinity and AT2R selective compound [Y]6-AII we developed several analogues through modifying aminoacids located at positions 6 and 7 with various conformationally constrained analogues to enhance both the selectivity and stability. We report the development of high-affinity AT2R binders, which displayed high selectivity for AT2R versus AT1R. Furthermore, all analogues presented enhanced stability in human plasma with respect to the parent hormone Angiotensin II as also [Y]6-AII.

Original languageEnglish
Article number128086
Number of pages4
JournalBioorganic and Medicinal Chemistry Letters
Volume43
DOIs
Publication statusPublished - 1 Jul 2021

Bibliographical note

Copyright © 2021 Elsevier Ltd. All rights reserved.

Keywords

  • Angiotensin II
  • Constrained peptides
  • Proteolytic stability
  • Receptor affinity
  • Receptor selectivity

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