1-((1H-Pyrazol-4-yl)methyl)-4-methyl-5-((4-(6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4-ylamino)piperidin-1-yl)methyl)-1H-indole-2-carbonitrile, 4-Methyl-1-(1H-pyrazol-4-ylmethyl)-5-[[4-[[6-(2,2,2-trifluoroethyl)thieno[2,3-d]pyrimidin-4-yl]amino]-1-piperidinyl]methyl]-1H-indole-2-carbonitrile, MI 503, MI503
Highly potent menin-MLL interaction inhibitor that selectively inhibits MLL oncogenic fusions-driven cancer progression in vitro and in vivo.
MI-503 is a highly potent menin-MLL interaction inhibitor (cell-free IC50 = 14.7 nM against 1 nM FITC-MLL(4-13) peptide; cellular IC50 = 220 nM using HEK293 MLL-AF9 fusion transfectants) that targets menin MLL-binding site with high affinity (KD = 9.3 nM by ITC). MI-503 selectively inhibits mixed lineage leukemia (MLL) oncogenic fusion-driven cancer progression in cultures (GI50 from 250 to 570 nM; GI50 >5 μM against cells without MLL gene translocation) and is efficacious against human MLL leukemia MV4;11 tumor growth in mice in vivo (by 80-100%; 60 mg/kg/day i.p.) with good pharmacokinetic properties, oral bioavailability (73% post 30 mg/kg p.o.), and no adverse effects to the animals.
RNA-binding proteins (RBPs) are emerging as a novel class of therapeutic targets in cancer, including in leukemia, given their important role in posttranscriptional gene regulation, and have the unexplored potential to be combined with existing therapies. The RBP insulin-like growth
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