Detection of novel functional selectivity at M3 muscarinic acetylcholine receptors using a Saccharomyces cerevisiae platform.
ACS Chem Biol
; 5(4): 365-75, 2010 Apr 16.
Article
em En
| MEDLINE
| ID: mdl-20155933
ABSTRACT
"Functional selectivity", although new to many chemists and biologists only a few years ago, has now become a dominant theme in drug discovery. This concept posits that different ligands engender unique receptor conformations such that only a subset of signaling pathways linked to a given receptor are recruited. However, successful exploitation of the phenomenon to achieve pathway-based selectivity requires the ability to routinely detect it when assessing ligand behavior. We have utilized different strains of the yeast S. cerevisiae, each expressing a specific human Galpha/yeast Gpa1 protein chimera coupled to a MAP kinase-linked reporter gene readout, to investigate the signaling of the M(3) muscarinic receptor, a G protein-coupled receptor (GPCR) for which various antagonists are used clinically. Using this novel platform, we found that the "antagonists", atropine, N-methylscopolamine, and pirenzepine, were inverse agonists for Gpa1/Galpha(q) but low efficacy agonists for Gpa1/Galpha(12.) Subsequent studies with atropine performed in mammalian 3T3 cells validated these findings by demonstrating inverse agonism for G(q/11)-mediated calcium mobilization but positive agonism for G(12)-mediated membrane ruffling. This is the first study to utilize a yeast platform to discover pathway-biased functional selectivity in a GPCR. In addition to the likely applicability of this approach for identifying biased signaling by novel chemical entities, our findings also suggest that currently marketed medications may exhibit hitherto unappreciated functional selectivity.
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Base de dados:
MEDLINE
Assunto principal:
Saccharomyces cerevisiae
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Atropina
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Pirenzepina
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Antagonistas Muscarínicos
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N-Metilescopolamina
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Receptor Muscarínico M3
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article