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Development of a Generic Dual-Reporter Gene Assay for Screening G-Protein-Coupled Receptors

Research School of Biosciences, University of Kent, Canterbury, Kent, UK; DI&A Functional Genomics, Aventis Pharma Deutschland GmbH, Frankfurt am Main, Germany.

Kevin S. J. Thompson

Akubio Ltd., Cambridge, UK.

Louise H. Naylor

Research School of Biosciences, University of Kent, Canterbury, Kent, UK.

Multiple assay formats have been developed for the pharmacological characterization of G-protein-coupled receptors (GPCRs) and for screening orphan receptors. However, the increased pace of target identification and the rapid expansion of compound libraries present the need to develop novel assay formats capable of screeningmultipleGPCRs simultaneously. To address this need, the authors have developed a generic dual-reporter gene assay that can detect ligand activity at 2 GPCRs within the same assay. Two stableHEK293 cell lineswere generated expressing either a firefly (Photinus) luciferase gene under the control ofmultiple cAMP-response elements (CREs) or a Renillaluciferase gene under the control ofmultiple 12-Otetradecanoylphorbol-13-acetate (TPA)-responsive elements (TREs). Coseeded reporter cells were used to assess ligandbinding activity at bothGß s-and Gß q-coupled receptors. By selectively coexpressing receptors with a chimeric G-protein, agonist activitywas assessed atGß i/o-coupled receptors in combinationwith eitherGß s-or Gß q-coupled receptors. The dual-reporter gene assaywas shown to be capable of simultaneously performing duplexed screens for a variety of agonist and/or antagonist combinations. The data generated from the duplexed reporter assays were pharmacologically relevant, and Zß factor analysis indicated the suitability of both agonist and antagonist screens for use in high-throughput screening.

Key Words: drug discovery • G-protein-coupled receptor • intracellular signaling • reporter gene • high-throughput screening • multiplexed

This version was published on August 1, 2005

Journal of Biomolecular Screening, Vol. 10, No. 5, 437-446 (2005)
DOI: 10.1177/1087057105275033


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