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Journal of Biomolecular Screening
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Pharmacological Characterization of Receptor Redistribution and β-Arrestin Recruitment Assays for the Cannabinoid Receptor 1

Miranda M.C. van der Lee

Schering-Plough Research Institute, Molecular Pharmacology Unit, Oss, The Netherlands

Marion Blomenröhr

Schering-Plough Research Institute, Molecular Pharmacology Unit, Oss, The Netherlands

Antoon A. van der Doelen

Schering-Plough Research Institute, Molecular Pharmacology Unit, Oss, The Netherlands

Jesse W.Y. Wat

Schering-Plough Research Institute, Molecular Pharmacology Unit, Oss, The Netherlands

Niels Smits

Schering-Plough Research Institute, Molecular Pharmacology Unit, Oss, The Netherlands

Bonnie J. Hanson

Invitrogen Discovery Sciences, Madison, Wisconsin

Chris J. van Koppen

Schering-Plough Research Institute, Molecular Pharmacology Unit, Oss, The Netherlands

Guido J.R. Zaman

Schering-Plough Research Institute, Molecular Pharmacology Unit, Oss, The Netherlands, guido.zaman{at}spcorp.com

Receptor redistribution and β-arrestin recruitment assays provide a G-protein-subtype-independent method to measure ligand-stimulated activation of G-protein-coupled receptors. In particular β-arrestin assays are becoming an increasingly popular tool for drug discovery. The authors have compared a high-content-imaging-based Redistribution® assay and 2 nonimaging-based β-arrestin recruitment assays, TangoTM and PathHunter TM, for the cannabinoid receptor 1. Inasmuch as all 3 assays use receptors that are modified at the C-terminus, the authors verified their pharmacology via detection of G{alpha}i coupling of the receptor in cAMP assays using reference ligands. The potencies and efficacies of the cannabinoid receptor agonists CP55,940 and WIN55,212-2 correlated well between the 3 assays, and are comparable with the measured ligand binding affinities. The inverse agonist SR141716 decreased basal signal in all 3 assays, but only in the Tango bla assay a reliable EC50 could be determined for this compound, suggesting that Tango is the most suitable assay for the identification of new inverse agonists. Both the Redistribution and the PathHunter assay could discriminate partial agonists from full agonists, whereas in the Tango assay partial agonists behaved as full agonists. Only the PathHunter cells allowed detection of cannabinoid receptor activation via β-arrestin recruitment and G{alpha}i-protein-mediated inhibition of cAMP, thus enabling the identification of biased ligands that differ in these cellular effects. The characteristics and limitations of the different assays are discussed. (Journal of Biomolecular Screening 2009:811-823)

Key Words: cannabinoid receptor 1 • redistribution • β-arrestin recruitment

This version was published on August 1, 2009

Journal of Biomolecular Screening, Vol. 14, No. 7, 811-823 (2009)
DOI: 10.1177/1087057109337937


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