A-419259

A-419259 is an inhibitor of Src family kinases, including Src, LCK, Lyn, and Hck (IC50s = 9, 50 = 3,000 nM) and PKC (IC50 = >33 ?M).{29932} A-419259 inhibits growth of Philadelphia chromosome-positive (Ph+) K-562 and Meg-01 myeloid leukemia cells (IC50s = 0.1-0.3 and 0.1 ?M, respectively), but not Ph- TF-1 and HEL cells. It induces apoptosis in K-562 cells in a concentration-dependent manner. A-419259 (300 nM) inhibits differentiation of murine embryonic stem cells while maintaining pluripotency.{29929} It reduces the total number of acute myeloid leukemia (AML) cells, as well as AML stem cells, in the bone marrow and spleen in mouse patient-derived xenograft (PDX) models of AML when administered at a dose of 30 mg/kg twice daily.{41984}