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Description: Quizartinib (formerly also know as AC-220; AC-010220, brand name Vanflyta in Japan) is a novel, potent, 2nd-generation, and orally bioavailable FLT3 tyrosine kinase inhibitor for Flt3 (ITD/WT) with potential anticancer activity. It inhibits FLT3 with IC50s of 1.1 nM/4.2 nM in MV4-11 and RS4;11 cells, respectively. It exhibits 10-fold more selectivity for Flt3 over KIT, PDGFRα, PDGFRβ, RET, and CSF-1R. Quizartinib isbeing developed by Daiichi Sankyo for the treatment of acute myeloid leukaemia.
References: Blood. 2009 Oct 1;114(14):2984-92.
Related CAS: 950769-58-1 (free base); 1132827-21-4 (HCl)
Chemical Name: 1-(5-(tert-butyl)isoxazol-3-yl)-3-(4-(7-(2-morpholinoethoxy)benzo[d]imidazo[2,1-b]thiazol-2-yl)phenyl)urea
InChi Key: CVWXJKQAOSCOAB-UHFFFAOYSA-N
InChi Code: InChI=1S/C29H32N6O4S/c1-29(2,3)25-17-26(33-39-25)32-27(36)30-20-6-4-19(5-7-20)22-18-35-23-9-8-21(16-24(23)40-28(35)31-22)38-15-12-34-10-13-37-14-11-34/h4-9,16-18H,10-15H2,1-3H3,(H2,30,32,33,36)
SMILES Code: O=C(NC1=CC=C(C2=CN3C(SC4=CC(OCCN5CCOCC5)=CC=C34)=N2)C=C1)NC6=NOC(C(C)(C)C)=C6
Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)
Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
This equation is commonly abbreviated as: C1V1 = C2V2
In vitro activity: AC220, a unique, potent and selective inhibitor of FLT3, has high affinity for FLT3 with a Kd value of 1.6 nM. AC220 inhibits the autophosphorylation of FLT3 in the human leukemia cell lines MV4-11 which harbor a homozygous FLT3-ITD mutation and is FLT3 dependent, and RS4;11 which expresses wild-type FLT3 with IC50 values of 1.1 nM and 4.2 nM, respectively. AC220 is the most potent cellular FLT3-ITD inhibitor, leading to the most significant inhibition of MV4-11 cell proliferation with IC50 of 0.56 nM compared to all other FLT3 inhibitors whose IC50 values range from 0.87 nM to 64 nM. AC220 has no inhibitory activity against the proliferation of A375 cells which harbor an activating mutation in BRAF and are not FLT3 dependent, indicating a large window between FLT3 inhibition and general cytotoxic effects.
Kinase Assay: To measure inhibition of FLT3 autophosphorylation, MV4-11 or RS4;11 cells are cultured in low serum media (0.5% FBS) overnight and seeded at a density of 400 000 cells per well in a 96-well plate the following day. The cells are incubated with different concentrations of AC220 for 2 hours at 37 °C. To induce FLT3 autophosphorylation in RS4;11 cells, 100 ng/mL FLT3 ligand is added for 15 minutes after the 2-hour AC220 incubation. Cell lysates are prepared and incubated in 96-well plates precoated with a total FLT3 capture antibody. The coated plates are incubated with either a biotinylated antibody against FLT3 to detect total FLT3 or an antibody against phosphotyrosines to detect FLT3 autophosphorylation. In both cases, a SULFO-tagged streptavidin secondary antibody is used for electrochemiluminescence detection on the Meso Scale Discovery platform. The concentration of AC220 that inhibits FLT3-ITD or TLT3-WT autophosphorylation by 50% represents IC50 value.
Cell Assay: Cells (MV4-11 and RS4;11 cells) are cultured overnight in low serum media (0.5% FBS), seeded in a 96-well plate at 40 000 cells per well and exposed to AC220 for 72 hours at 37 °C. Cell viability is measured using the Cell Titer-Blue Cell Viability Assay.
Blood. 2009 Oct 1;114(14):2984-92.
Purity ≥98%
NMR