AGI-6780

AGI-6780 that potently and selectively inhibits the tumor-associated mutant IDH2R140Q with IC50 of 23±1.7 nM. AGI-6780 is less potent against IDH2WT with IC50 of 190±8.1 nM.

Signaling Pathways >> Metabolic Enzyme/Protease >> Isocitrate Dehydrogenase (IDH)

Research Areas >> Cancer

IC50: 23±1.7 nM (IDH2R140Q), 190±8.1 nM (IDH2WT)[1]

AGI-6780 is tested in both human glioblastoma U87 and TF-1 cells expressing IDH2R140Q, as well as against IDH1R132H for 48 h incubation, with IC50 of 11±2.6 nM, 18±0.51 nM, and >1 mM, respectivly.Treatment of TF-1R140Q cells with AGI-6780, at concentrations that lower 2HG to near-normal physiologic levels, restore expression of both HBG and KLF1 genes and the color change associated with differentiation. AGI-6780 can reverse the IDH2R140Q-induced differentiation block in TF-1 cells. Pretreatment with AGI-6780 (0.2 μM and 1 μM) markedly decreased the intracellular concentration of (R)-2-hydroxyglutarate in the TF1R140Q cells and restored their ability to undergo EPO-induced differentiation[1].

AGI-6780 is prepared as 10 mM stock in DMSO and diluted to 50X final concentration in DMSO, for a 50 μL reaction mixture. IDH enzyme activity converting alpha-ketoglutarate to 2-hydroxyglutarate is measured using a NADPH depletion assay. In the assay the remaining cofactor is measured at the end of the reaction with the addition of a catalytic excess of diaphorase and resazurin, to generate a fluorescent signal in proportion to the amount of NADPH remaining. IDH enzyme activity in the direction of isocitrate to alpha-ketoglutarate conversion is measured by direct coupling of the NADPH production to conversion of resazurin to resorufin by diaphorase. In both cases, resorufin is measured fluorometrically at Ex544 Em590[1].

Cells are sorted from fresh or frozen bone marrow aspirates and blood samples after labelling with PE-CD34, APC-CD38, PE-CD14, FITC-CD3 (clone HIT3a) and PECy7-CD19 (clone SJ25C1) antibodies using a MoFlow cell sorter. Unfractionated nucleated blood or bone marrow cells are plated in Methocult H4434 methylcellulose medium at 104 cells/dish, in duplicate dishes per condition. AGI-6780 (5 mM) is directly added to the medium. Dishes are incubated in a humidified incubator at 37°C and colonies containing at least 30 cells are counted after 13 days[1].

[1]. Wang F, et al. Targeted inhibition of mutant IDH2 in leukemia cells induces cellular differentiation. Science. 2013 May 3;340(6132):622-6.

AG-120 | Enasidenib | AGI-5198 | Vorasidenib (AG-881) | GSK864 | IDH-305 | BAY-1436032 | Mutant IDH1 inhibitor | Mutant IDH1-IN-1 | Mutant IDH1-IN-2 | Olutasidenib