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Discovery of a FLT3 inhibitor LDD1937 as an anti-leukemic agent for acute myeloid leukemia.
Oncotarget 2018 January 3
FMS-like receptor tyrosine kinase-3 (FLT3) belongs to the family of receptor tyrosine kinase (RTK), and the FLT3 mutation is observed in 1/3 of all acute myeloid leukemia (AML) patients. Potential FLT3 inhibitors have been investigated as potential therapeutic agents of AML. In this study, we identified a potent FLT3 inhibitor LDD1937 containing an indirubin skeleton. The potent inhibitory activity of LDD1937 against FLT3 was shown with an in vitro kinase assay (IC50 = 3 nM). The LDD1937 compound selectively inhibited the growth of MV-4-11 cells (GI50 = 1 nM) and induced apoptotic cell death. LDD1937 caused cell cycle arrest at the G2 /M phase and increased the cell population at the sub-G1 phase. Phosphorylation of STAT5, which is the downstream signaling of FLT3, was significantly reduced by LDD1937 in a dose-dependent manner. The pharmacokinetic properties of LDD1937 were investigated in mice. Then, the in vivo anti-tumor effect was investigated using a MV-4-11 xenograft. With the intravenous administration of 5 and 10 mg/kg in nu/nu mice, the tumor volume and weight were significantly reduced compared to the control. LDD1937 is a promising therapeutic candidate to treat AML patients because of its ability to suppress tumor cell growth in vitro and in vivo .
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