Development of the High Throughput Screening Assay for Identification of Agonists of an Orphan Nuclear Receptor
- 1 June 2006
- journal article
- research article
- Published by Mary Ann Liebert Inc in ASSAY and Drug Development Technologies
- Vol. 4 (3) , 253-262
- https://doi.org/10.1089/adt.2006.4.253
Abstract
Retina-specific nuclear receptor (RNR), also known as PNR and NR2E3, is an orphan nuclear receptor expressed exclusively in photoreceptor cells of the retina. Here we describe homogeneous cell-based resonance energy transfer assay for identification of RNR agonists using β-lactamase as the reporter gene. Bacterial β-lactamase reporter construct containing GAL4 response elements was randomly integrated into the genome with subsequent selection of responsive cell pools by fluorescence-activated cell sorting. Chimeric RNR (RNR hinge and ligand-binding domains fused to GAL4 DNA-binding domain) was stably transfected into mammalian Flp-In Chinese hamster ovary cells using Flp-mediated recombination into a single pre-integrated Flp recombination target site. Since no RNR ligand could be used as a control for monitoring the development of the RNR assay, we developed a parallel cell line with the functionally related well-characterized thyroid hormone nuclear receptor. This parallel thyroid hormone nuclear receptor system was used as a "guide" in optimizing the RNR assay for ultra-high-throughput screening in 3,456-well nanoplate format. The assay was successfully used to screen a large compound collection for RNR agonists. In this study we demonstrated the feasibility of developing and optimization of the high-throughput screening-compatible assay for the orphan nuclear receptor in the absence of its cognitive ligand.Keywords
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