LDN192960 (LDN 192960) is a highly potent and selective DYRK2 inhibitor with IC50 of 13 nM toward DYRK2 at 50 uM ATP.LDN192960 suppresses Thr25 RPT3 phosphorylation in a dose-dependent manner in HEK293T cells transiently overexpressing DYRK2-FLAG, with maximal effects at 1-10 uM.LDN192960 does not inhibit any of the 130+ kinases including other CMGC kinase family members that are closely related to the DYRKs.LDN192960 binds to the ATP-binding pocket of DYRK2, also potently inhibits DYRK1A, DYRK3 and Pim with IC50 of <3, 122 and 10 nM, respectively.LDN192960 perturbs proteasome activity, induces cell death, and impedes proliferation and invasion on MDA-MB-468 cells.LDN192960 impedes MM progression and delays myeloma-mediated bone degeneration.LDN192960 induces cytotoxicity in bortezomib-resistant MM, both in cells and in vivo. significantly alleviates tumor burden in standard and PDX TNBC models.
