Quizartinib (AC220)

Catalog No.S1526 Batch:S1526

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Technical Data

Formula

C29H32N6O4S
Molecular Weight 560.67 CAS No. 950769-58-1
Solubility (25°C)* In vitro DMSO 33 mg/mL (58.85 mM)
Water Insoluble
Ethanol Insoluble
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

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Biological Activity

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. This compound induces apoptosis of tumor cells. Phase 3.
Targets
FLT3 (ITD) [1]
(MV4-11 cells)		 FLT3 (WT) [1]
(RS4;11 cells)
1.1 nM 4.2 nM
In vitro AC220, a unique, potent and selective inhibitor of FLT3, has high affinity for FLT3 with a Kd value of 1.6 nM. This compound 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. It 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. This chemical 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. [1]
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. This compound 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 this chemical 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. It 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. [1]
Features The most potent cellular FLT3-ITD inhibitor.

Protocol (from reference)

Kinase Assay:[1]
  • 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 this compound 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 incubation with this chemical. 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 this compound that inhibits FLT3-ITD or TLT3-WT autophosphorylation by 50% represents IC50 value
Cell Assay:[1]
  • Cell lines

    MV4-11 and RS4;11 cells

  • Concentrations

    Dissolved in DMSO, final concentration ~20 μM

  • Incubation Time

    72 hours

  • Method

    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 this compound for 72 hours at 37 °C. Cell viability is measured using the Cell Titer-Blue Cell Viability Assa
Animal Study:[1]
  • Animal Models

    Female NU/NU or severe combined immunodeficient mice implanted with MV4-11 cells

  • Dosages

    ~10 mg/kg

  • Administration

    Oral gavage

References

  • https://pubmed.ncbi.nlm.nih.gov/19654408/

Customer Product Validation

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.

Data from [ Mol Cancer Ther , 2014 , 13(10), 2315-27 ]

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.

Data from [ PLoS One , 2013 , 8(8), e71266 ]

<p>The effect of the FLT3 inhibitor AC220 (2nM) on the expression of MYC and E2F1 in MOLM-13 and MV4;11 cells. Cells were treated with vehicle and the FLT3 specific inhibitor AC220 for 24 hM, and then the mRNA and protein levels of MYC and E2F1 were tested.</p>

, , Leuk Lymphoma, 2017, 58(10):2426-2438

<p>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.</p>

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Selleck's Quizartinib (AC220) Has Been Cited by 164 Publications

High mtDNA content identifies oxidative phosphorylation-driven acute myeloid leukemias and represents a therapeutic vulnerability [ Signal Transduct Target Ther, 2025, 10(1):222] PubMed: 40653487
ADH5/ALDH2 dehydrogenases and DNA polymerase theta protect normal and malignant hematopoietic cells from formaldehyde challenge: therapeutic implications [ Leukemia, 2025, 39(9):2152-2162] PubMed: 40640557
Dual targeting of CDK6 and LSD1 is synergistic and overcomes differentiation blockade in AML [ EMBO Mol Med, 2025, 10.1038/s44321-025-00296-2] PubMed: 40883610
Chaperone-mediated autophagy regulates the metastatic state of mesenchymal tumors [ EMBO Mol Med, 2025, 17(4):747-774] PubMed: 40055574
FLT3 inhibitors induce p53 instability, driven by STAT5/MDM2/p53 competitive interactions in acute myeloid leukemia [ Cancer Lett, 2025, 611:217446] PubMed: 39756787
Inhibition of NLRP3 enhances pro-apoptotic effects of FLT3 inhibition in AML [ Cell Commun Signal, 2025, 23(1):53] PubMed: 39875995
FLT3-ITD promotes immune checkpoint CD80 via ROS elevation in acute myeloid leukemia [ Front Immunol, 2025, 16:1577313] PubMed: 40746567
Conventional type 1 dendritic cells in the lymph nodes aggravate neuroinflammation after spinal cord injury by promoting CD8+ T cell expansion [ Mol Med, 2025, 31(1):37] PubMed: 39901071
Anti-Tumor Effects of Gilteritinib on FLT3 Mutations: Insights into Resistance Mechanisms in Ba/F3 Cell Models [ Onco Targets Ther, 2025, 18:489-501] PubMed: 40196870
Multi-selective RAS(ON) Inhibition Targets Oncogenic RAS Mutations and Overcomes RAS/MAPK-Mediated Resistance to FLT3 and BCL2 Inhibitors in Acute Myeloid Leukemia [ bioRxiv, 2025, 2025.06.10.658786] PubMed: 40661530

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