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Structure-Activity Relationship of the Agonist-Antagonist Transition on the Type 1 Angiotensin II Receptor; the Search for Inverse Agonists

  • Jacqueline Pérodin
  • Roger Bossé
  • Sylvain Gagnon
  • Li-Ming Zhou
  • Richard Bouley
  • Richard Leduc
  • Emanuel Escher
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 396)

Abstract

Peptidic angiotensin II (Ang) antagonists have been mostly reported to behave in a more or less competitive fashion. Thus, reinforcing the view of competitive analogues being compounds which can reversibly bind without producing any biological response to the receptor as well as competing with an agonist (e.g. Ang or other peptidic agonists) for the same site. Recently, a new concept was introduced that changes the classical view of agonist-antagonist action. This concept presents the receptor as a dynamic structure capable of undergoing a conformational change between a biologically active and an inactive form. A bound ligand may shift the equilibrium to either side, according to its pharmacological character as an agonist or an antagonist: An antagonist favoring the inactive form of the receptor represents what is called an “inverse agonist”. All peptidic Ang analogues bind to the same locus on the AT1 receptor but non-peptidic AT1 binding compounds (e.g. L-158,809 and DuP 753) seem to bind to different loci. Furthermore, it has also been shown that non-peptidic Ang antagonists do not possess the ability to recognize Ang receptors from amphibian or avian origins. In the present contribution, we attempt to fathom the molecular parameters that bring the transition from an agonistic to an antagonistic behaviour in order to select the compounds that display most profoundly these antagonistic features. We believe to possess the necessary tools (enlarged but planar aromatic side-chains in position 8) in order to explore the concept of inverse agonism on the mammalian AT1 receptor.

Keywords

Intrinsic Activity Inverse Agonist Full Agonist Rabbit Aorta Recombinant Cell Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Jacqueline Pérodin
    • 1
  • Roger Bossé
    • 1
  • Sylvain Gagnon
    • 1
  • Li-Ming Zhou
    • 1
  • Richard Bouley
    • 1
  • Richard Leduc
    • 1
  • Emanuel Escher
    • 1
  1. 1.Département de Pharmacologie, Faculté de MédecineUniversité de SherbrookeSherbrookeCanada

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