Journal of Biomolecular Screening

 

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Journal of Biomolecular Screening, Vol. 13, No. 1, 40-53 (2008)
DOI: 10.1177/1087057107312128

Pharmacological Profiling of Chemokine Receptor–Directed Compounds Using High-Content Screening

Dorothea Haasen

Department of Integrated Lead Discovery, Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany

Susanne Merk

Department of Integrated Lead Discovery, Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany

Peter Seither

Department of Respiratory Research, Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany

Domnic Martyres

Department of Chemical Research, Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany

Silke Hobbie

Department of Respiratory Research, Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany

Ralf Heilker

Department of Integrated Lead Discovery, Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany, ralf.heilker{at}bc.boehringer-ingelheim.com

High-content screening, typically defined as automated fluorescence microscopy combined with image analysis, is now well established as a means to study test compound effects in cellular disease-modeling systems. In this work, the authors establish several high-content screening assays in the 384-well format to measure the activation of the CC-type chemokine receptors 2B and 3 (CCR2B, CCR3). As a cellular model system, the authors use Chinese hamster ovary cells, stably transfected with 1 of the respective receptors. They characterize receptor stimulation by human monocyte chemoattractant protein-1 for CCR2B and by human eotaxin-1 for CCR3: Receptor internalization and receptor-induced phosphorylation of ERK1/2 (pERK) were quantified using fluorescence imaging and image analysis. The 4 assay formats were robust, displayed little day-to-day variability, and delivered good Z' statistics for both CCRs. For each of the 2 receptors, the authors evaluated the potency of inhibitory compounds in the internalization format and the pERK assay and compared the results with those from other assays (ligand displacement binding, Ca2+ mobilization, guanosine triphosphate exchange, chemotaxis). Both physiological agonists and test compounds differed significantly with respect to potencies and efficacies in the various profiling assays. The diverse assay formats delivered partially overlapping and partially complementary information, enabling the authors to reduce the probability of test compound—related technology artifacts and to specify the mode of action for individual test compounds. Transfer of the high-content screening format to a fully automated medium-throughput screening platform for CCR3 enabled the profiling of large compound numbers with respect to G protein signaling and possible tolerance-inducing liabilities. (Journal of Biomolecular Screening 2008:40-53)

Key Words: high-content screening • CCR3 • CCR2B • ERK phosphorylation • internalization


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