AID	Name	Type	Comment
489036	VP16 selectivity assay for inhibitors of ROR gamma transcriptional activity	confirmatory
489039	ROR alpha selectivity assay for inhibitors of ROR gamma transcriptional activity	confirmatory
2604	Quantitative high throughput screen for inhibitors of ROR gamma transcriptional activity: Summary	summary
492954	Mouse Th17 T cell differentiation assay for inhibitors of ROR gamma transcriptional activity	confirmatory
2762	Concentration response confirmation assay for inhibitors of ROR gamma transcriptional activity	confirmatory
489037	Secondary confirmation assay for inhibitors of ROR gamma transcriptional activity	confirmatory
489038	DHR3 selectivity assay for inhibitors of ROR gamma transcriptional activity	confirmatory
492962	Mouse Th1 T cell differentiation assay for inhibitors of ROR gamma transcriptional activity	other

NIH Molecular Libraries Probe Production Network [MLPCN]
NIH Chemical Genomics Center [NCGC]

MLPCN Grant: R03 DA026211-01
Assay Provider: Dan Littman, New York University

Assay Overview:

The retinoic acid-related orphan receptor (ROR) gamma is a transcription factor that has a central role in the differentiation of Th17 cells, a subset of T helper cells that secrete the inflammatory cytokines IL-17, IL-17F, and IL-22. Th17 cells have been implicated in graft versus host disease, autoimmune disease and asthma. ROR gamma is induced in naive T helper cells in the presence of TGF-beta combined with IL-6, IL-21, or IL-23, and thereafter directs the expression of the Th17 lineage cytokines. To study the mechanism of action of ROR gamma, an insect cell-based assay was screened. This Drosophila Schneider cell line was stably transfected with two vectors: a gene expressing a fusion of the Gal4 DNA binding domain and ROR gamma transactivation domain under the control of the metallothionine promoter and a Photinus luciferase reporter regulated by the Gal4 binding site enhancer, UAS. The addition of copper to the medium induced expression of the Gal4-ROR gamma fusion that subsequently induced the UAS-luciferase reporter. Small molecule inhibitors of ROR gamma activity are detected by a decrease in luciferase reporter activity.

Assay Protocol Summary:

For screening, 600 cells in 4 uL/well were dispensed into white solid 1536-well plates (Grenier) using a solenoid-based dispenser. Following transfer of 23 nL compound or DMSO vehicle by a pin tool, the plates were incubated 1 hr at ambient temperature, and 1 uL/well copper sulfate (700 uM final concentration) was added. The plates were centrifuged 15 s at 1000 RPM and incubated 20 hr at ambient temperature. After addition of 1.5 uL Photinus luciferase detection reagent, the plates were incubated 10 min at ambient temperature and then read by an ViewLux (Perkin Elmer) to detect luminescence.

Keywords: NIH Roadmap, MLPCN, MLI, MLSMR, qHTS, NCGC, qHTS, nuclear hormone receptor, retinoic acid-related orphan receptor, ROR gamma

Compound Ranking:

1. Compounds are first classified as having full titration curves, partial modulation, partial curve (weaker actives), single point activity (at highest concentration only), or inactive. See data field "Curve Description". For this assay, apparent inhibitors are ranked higher than compounds that showed apparent activation.
2. For all inactive compounds, PUBCHEM_ACTIVITY_SCORE is 0. For all active compounds, a score range was given for each curve class type given above. Active compounds have PUBCHEM_ACTIVITY_SCORE between 40 and 100. Inconclusive compounds have PUBCHEM_ACTIVITY_SCORE between 1 and 39. Fit_LogAC50 was used for determining relative score and was scaled to each curve class' score range.

Grant Number: R03 DA026211-01