Molecular Weight(MW): 560.67
Quizartinib (AC220) is a second-generation FLT3 inhibitor for Flt3(ITD/WT) with IC50 of 1.1 nM/4.2 nM in MV4-11 and RS4;11 cells, respectively, 10-fold more selective for Flt3 than KIT, PDGFRα, PDGFRβ, RET, and CSF-1R. Phase 3.
Cited by 13 Publications
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Cotreatment with JQ1 and AC220 synergistically induces apoptosis of FLT3-ITD–expressing AML cells. MV4-11 cells were treated with the indicated concentrations of AC220 and/or JQ1 for 24 hours. At the end of treatment, immunoblot analyses were conducted as indicated. The numbers beneath the blots represent densitometry analysis conducted on representative blots.
Mol Cancer Ther 2014 13(10), 2315-27. Quizartinib (AC220) purchased from Selleck.
Crude membranes from High-Five insect cells expressing ABCB1 and MCF-7 FLV1000 cells expressing ABCG2 were incubated with 0–30 uM quizartinib for 5 minutes at 21–23°C in 50 mM Tris-HCl, pH 7.5 and 3–6 nM [125I]-IAAP (2200 Ci/mmole) was added. Representative autoradiograms from one experiment are shown in the upper panels; similar results were obtained in two additional experiments. In the lower panels, incorporation of [125I]-IAAP (from autoradiogram, Y-axis) into the ABCB1 and ABCG2 bands was plotted as a function of quizartinib concentration (X-axis). Quizartinib inhibited [125I]-IAAP binding to ABCB1 and ABCG2 with IC50’s of 3.3 uM and 0.07 uM, respectively, and the latter correspond to a therapeutically relevant plasma concentration. Values are from a representative experiment among three independent experiments.
PLoS One 2013 8(8), e71266. Quizartinib (AC220) purchased from Selleck.
Effect of AC220 on the sensitivity of KB-C2 cells to paclitaxel. The figure showes the survival curves of cells at different concentrations of paclitaxel with or without AC220. Cell viability was determined by MTT Assay. KB-3-1 is epidermoid carcinoma cell line while KB-C2 is ABCB1 (P-gp) overexpressing drug (cholchicine) selected cell line. VERA (Verapamil) was used as a positive control of ABCB1 inhibitor.
Quizartinib (AC220) purchased from Selleck.
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2. For more details, such as half maximal inhibitory concentrations (IC50s) and working concentrations of each inhibitor, please click on the link of the inhibitor of interest.
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|Description||Quizartinib (AC220) is a second-generation FLT3 inhibitor for Flt3(ITD/WT) with IC50 of 1.1 nM/4.2 nM in MV4-11 and RS4;11 cells, respectively, 10-fold more selective for Flt3 than KIT, PDGFRα, PDGFRβ, RET, and CSF-1R. Phase 3.|
|Features||The most potent cellular FLT3-ITD inhibitor.|
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. 
|In vivo||Oral administration of AC220 (10 mg/kg) induces time-dependent inhibition of FLT3 autophosphorylation in the FLT3-ITD–dependent MV4-11 tumor xenograft mouse model; the inhibition being 90% at 2 hours and 40% at 24 hours. AC220 significantly extends survival in a mouse model of FLT3-ITD AML with doses as low as 1 mg/kg given orally once a day. Treatment with AC220 at 10 mg/kg for 28 days results in rapid and complete regression of tumors in all mice with no tumor regrowth during the 60-day posttreatment period. AC220 displays more significant efficacy compared to sunitinib treatment which causes tumors to shrink slowly and resume growth immediately upon discontinuation of treatment in all but one of the mice. |
Inhibition of FLT3 autophosphorylation: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
|In vitro||DMSO||33.2 mg/mL (59.21 mM)|
|Water||<0.3 mg/mL <0.3|
|Ethanol||<0.5 mg/mL <0.5|
|In vivo||15% Captisol||30 mg/mL|
* 1 mg/ml means slightly soluble or insoluble.
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Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT02834390||Not yet recruiting||Acute Myeloid Leukemia||Daiichi Sankyo Co., Ltd.|Daiichi Sankyo Inc.||July 2016||Phase 1|
|NCT02668653||Not yet recruiting||Acute Myeloid Leukemia|Leukemia||Daiichi Sankyo Inc.||March 2016||Phase 3|
|NCT02675478||Recruiting||Relapsed AML|Refractory AML||Daiichi Sankyo Co., Ltd.|Daiichi Sankyo Inc.||February 2016||Phase 1|
|NCT02272478||Not yet recruiting||Acute Myeloid Leukaemia|Myelodysplastic Syndrome||Cardiff University|Cancer Research UK||October 2014||Phase 3|
|NCT02039726||Recruiting||AML||Daiichi Sankyo Inc.||April 2014||Phase 3|
|NCT01892371||Recruiting||Leukemia||M.D. Anderson Cancer Center|Ambit Biosciences Corporation|Celgene|National Cancer Institute (NCI)||November 2013||Phase 1|Phase 2|
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