URMC-099 (1229582-33-5) is a potent (IC50 = 14 nM), brain penetrant mixed-lineage kinase 3 inhibitor (MLK3). It also potently inhibits FLT3 (4 nM in vitro, but 560 nM in vivo), LRRK2 (11 nM), and ABL1 (3 nM).1 URMC-099 displayed neuroprotective effects in HIV-associated neurocognitive disorders2 and facilitated microglial amyloid-β degradation and clearance in mouse models.3,4 URMC-099 increased CD8+ T cells in mice and increased the CD8+GZMB+ T cell population in blood mononuclear cells isolated from breast cancer patients.5
URMC-099 is an orally bioavailable MLK3 inhibitor used in the treatment of Parkinson’s disease and HIV-1 associated neurocognitive disorders.
1) Goodfellow et al. (2013), Discovery, synthesis, and characterization of an orally bioavailable, brain penetrant inhibitor of mixed lineage kinase 3; J. Med. Chem. 56 8032
2) Marker et al. (2013), The new small-molecule mixed-lineage kinase 3 inhibitor URMC-099 is neuroprotective and anti-inflammatory in models of human immunodeficiency virus-associated neurocognitive disorders; J. Neurosc. 33 9998
3) Dong et al. (2016), The mixed-lineage kinase 3 inhibitor URMC-099 facilitates microglial amyloid-β degradation; J. Neuroinflammation 13 184
4) Kiyota et al. (2018), URMC-099 facilitates amyloid-β clearance in a murine model of Alzheimer’s disease; J. Neuroinflammation 15 137
5) Kumar et al. (2020), Mixed lineage kinase 3 inhibition induces T cell activation and cytotoxicity; Proc. Natl. Acad. Sci. USA 9 34567
