Abstract
Retinoic acid receptor-related orphan receptor γ (RORγ) is a nuclear hormone receptor with multiple biological functions. As an experimental therapeutic target in inflammation and immunity, there is great interest in spatially-localised RORγ inhibition; and its cyclic temporal role in circadian rhythms also makes it an intriguing target for time-resolved pharmacology. To create tools that can study RORγ biology with appropriate spatial and temporal resolution, we designed light-dependent inverse RORγ agonists by building azobenzene photoswitches into ligand consensus structures. Optimizations gave photoswitchable RORγ inhibitors with a large degree of potency photocontrol, plus remarkable on-target potency, plus excellent selectivity over related off-target receptors. This still-rare, but urgently-needed combination of performance features, distinguishes them as high quality photopharmaceutical probes; and they can now serve as high precision tools to study the spatial and dynamic intricacies of RORγ action in signaling and in inflammatory disorders.
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