A-9758 (A9758) is a selective, small molecule inverse agonist of retinoid-related orphan receptor gamma t (hRORγt IC50=38 nM).A-9758 also inhibits mouse RORγ transactivation with similar activity (20 nM) and is equally active on dog and rat RORγ (25 and 64 nM, repectively).A-9758 inhibits TCR-mediated IL-17A secretion with an IC50 of 100 and 38 nM in human CD4+ T cells and in vitro differentiated mouse Th17 cells, respectively.A-9758 exhibits robust potency against IL-17A release both in vitro and in vivo, significantly attenuates IL-23 driven psoriasiform dermatitis.A-9758 exhibits efficacy in an ex vivo human whole blood assay, is efficacious in human IL-17 related diseases.
