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Title: Useful pharmacological parameters for G-protein-coupled receptor homodimers obtained from competition experiments. Agonist-antagonist binding modulation
Author: Casadó, Vicent
Ferrada, Carla
Bonaventura, Jordi
Gracia, Eduard
Mallol Montero, Josefa
Canela Campos, Enric I.
Lluís i Biset, Carme
Cortés Tejedor, Antonio
Franco Fernández, Rafael
Keywords: Bioquímica
Biologia molecular
Interacció cel·lular
Molecular biology
Cell interaction
Issue Date: 15-Dec-2009
Publisher: Elsevier B.V.
Abstract: Many G-protein-coupled receptors (GPCRs) are expressed on the plasma membrane as dimers. Since drug binding data are currently fitted using equations developed for monomeric receptors, the interpretation of the pharmacological data are equivocal in many cases. As reported here, GPCR dimer models account for changes in competition curve shape as a function of the radioligand concentration used, something that cannot be explained by monomeric receptor models. Macroscopic equilibrium dissociation constants for the agonist and homotropic cooperativity index reflecting the intramolecular communication within the dopamine D1 or adenosine A2A receptor homodimer as well as hybrid equilibrium dissociation constant, which reflects the antagonist/agonist modulation may be calculated by fitting binding data from antagonist/agonist competition experiments to equations developed from dimer receptor models. Comparing fitting the data by assuming a classical monomeric receptor model or a dimer model, it is shown that dimer receptor models provide more clues useful in drug discovery than monomer-based models.
Note: Versió postprint del document publicat a:
It is part of: Biochemical Pharmacology, 2009, vol. 78, num. 12, p. 1456-1463
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ISSN: 0006-2952
Appears in Collections:Articles publicats en revistes (Bioquímica i Biomedicina Molecular)

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