1068 www.sbsonline.org © 2007 Society for Biomolecular Sciences Application of the BD ACTOne ™ Technology for the High-Throughput Screening of Gs-Coupled Receptor Antagonists

A novel technology for monitoring the changes of 3,′5′-adenosine cyclic monophosphate (cAMP) in live cells suitable for drug screening relies on the use of cyclic nucleotide-gated channels as biosensors coexpressed with the appropriate target receptor. The technique (termed BD ACTOne™) offers measurement of cAMP-dependent calcium influx or membrane depo-larization with conventional fluorescent methods both in kinetic and in endpoint modes, optimal for high-throughput and sub-sequent compound screening. The utility of the technique is reported here based on assay development and high-throughput screening for small-molecule antagonists of the peptide parathyroid hormone 2 receptor (PTH2R). The dual-signaling prop-erties of the receptor were retained in the recombinant system, and the observed pharmacological profile corresponded to data from radiolabeled cAMP determination. The membrane-potential-based high-throughput assay produced reproducible actives and led to the identification of several chemical scaffolds with potential utility as PTH2R ligands. (Journal of Biomolecular Screening 2007:1068-1073) Key words: cyclic nucleotide-gated channel, high-throughput screening, cAMP, G-protein-coupled receptor, peptid