c-Kit (IC50 = 0.17 μM); PDGFRβ (IC50 = 0.20 μM); FLT3 (IC50 = 0.22 μM); CSF-1R (IC50 = 3.43 μM)

Tandutinib, when administered orally at a dose of 60 mg/kg bid, has been shown to significantly reduce mortality in a mouse bone marrow transplantation model and to improve survival in mice harboring Ba/F3 cells expressing the W51 FLT3-ITD mutant.[1] Mice with FLT3 ITD-positive leukemia can be successfully treated with tantutinib at a dose of 180 mg/kg twice day, although this dosage has mild toxicity toward normal hematopoiesis.[2]

PDGFR family kinase autophosphorylation assays are cell-based enzyme-linked immunosorbent (ELISA) assays that use CHO cells expressing PDGFRβ wild-type, PDGFRβ/c-Kit chimeric protein, and PDGFRβ/Flt3, which contain the cytoplasmic domain of Flt-3 and c-Kit as well as the extracellular and transmembrane domains of PDGFRβ. Standard tissue culture conditions are used to grow cells to confluency in 96-well microtiter plates. After that, the cells are starved of serum for 16 hours. In summary, quiescent cells are cultured for 30 minutes at 37 °C with escalating concentrations of tantutinib, and then 8 nM PDGF-BB is added and left for 10 minutes. Lysate is obtained by centrifuging the cell lysate at 15,000g for 5 minutes after it has been lysed in 100 mM Tris, pH 7.5, 750 mM NaCl, 0.5% Triton X-100, 10 mM sodium pyrophosphate, 50 mM NaF, 10 μg/mL aprotinin, 10 μg/mL leupeptin, 1 mM phenylmethylsulfonyl fluoride, and 1 mM sodium vanadate. The lysates that have been clarified are then moved into a second microtiter plate, where the wells have been coated with 500 ng/well of 1B5B11 anti-PDGFRβ mAb and allowed to sit at room temperature for two hours. Plates are incubated at 37 °C for 60 minutes after being washed three times with binding buffer (0.3% gelatin, 25 mM HEPES, pH 7.5, 100 mM NaCl, 0.01% Tween 20). Following this, 250 ng/mL of rabbit polyclonal anti-phosphotyrosine antibody is added. Then, each well is incubated with 1 μg/mL of horseradish peroxidase-conjugated anti-rabbit antibody for 60 minutes at 37 °C after being cleaned three times with binding buffer. Before adding 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid), the wells are cleaned, and the rate of substrate formation is kept track of at 650 nm.

Tandutinib is exposed to cells at escalating concentrations (0.004-30 μM). Viable cells are counted after 3–7 days of cell growth in tissue culture, as assessed by Trypan blue dye exclusion. Cells are taken out, cleaned, and resuspended in 100 uL of binding buffer that has 140 mM NaCl, 2.5 mM CaCl2, and 10 mM HEPES (pH 7.4) in it every day. The cell suspension is mixed with 100 ng of annexin V-FITC and 250 ng of propidium iodide, and then it is incubated for 15 minutes at room temperature. Using a FACSort flow cytometer with an excitation wavelength of 488 nm, flow cytometry is carried out right after staining. The fluorescence of DNA propidium iodide staining and annexin V-FITC staining is measured at 585 nm and 515 nm, respectively.

Female athymic nude (nu/nu) mice injected with Ba/F3 cells expressing W51 FLT3-ITD mutant
40-120 mg/kg/day
Orally by gavage

[1]. Cancer Cell . 2002 Jun;1(5):421-32.

[2]. Blood . 2004 Nov 1;104(9):2912-8.

[3]. Cell Cycle . 2009 Aug 15;8(16):2621-30.

Tandutinib is an N-arylpiperazine that is piperazine in which the hydrogen attached to the nitrogen at position 1 is replaced by a 6-methoxy-7-[3-(piperidin-1-yl)propoxy]quinazolin-4-yl group, while the hydrogen attached to the nitrogen at position 4 is replaced by a (p-isopropoxyphenyl)aminocarbonyl group. Tandutinib is an inhibitor of tyrosine kinases FLT3, PDGFR and KIT. It has a role as an antineoplastic agent and an EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor. It is a N-carbamoylpiperazine, a N-arylpiperazine, a member of quinazolines, a member of piperidines, an aromatic ether, a tertiary amino compound and a member of phenylureas.
MLN518 is a novel, oral, small molecule designed to inhibit type III receptor tyrosine kinases, including FLT3, (platelet-derived growth-factor receptor) PDGFR and c-KIT. Tyrosine kinases are enzymes involved in several cellular processes and are known to be activated in cancer cells to drive tumor growth. AML patients with FLT3 mutations experience earlier disease relapse and shorter survival rates compared to patients without these mutations. Approximately 25 to 30 percent of all adult AML patients have a mutation of the FLT3 gene. The use of MLN518 to treat AML has been granted fast-track status by the U.S. Food and Drug Administration. Phase I/II trials are underway.
Tandutinib is a piperazinyl quinazoline receptor tyrosine kinase inhibitor with antineoplastic activity. Tandutinib inhibits the autophosphorylation of FLT3 (FMS-Like Tyrosine kinase-3), c-KIT and PDGF (platelet-derived growth factor) receptor tyrosine kinases, thereby inhibiting cellular proliferation and inducing apoptosis.

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Drug Indication
Investigated for use/treatment in leukemia (myeloid).

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Mechanism of Action
MLN518 inhibits tyrosine kinases; Specifically, it is selective for FLT3, KIT, and platelet-derived growth-factor receptor (PDGFR).

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Pharmacodynamics
MLN518 is a novel quinazoline-based small molecule inhibitor of the FLT3, KIT, and platelet-derived growth-factor receptor (PDGFR) tyrosine kinases with that has been shown to have great efficacy in murine models of FLT3 ITD-positive leukemia. Experiments with mice demonstrate that at effective concentrations, MLN518 has mild toxicity toward normal hematopoiesis for FLT3 ITD-positive leukemia. MLN518 has also been shown to preferentially inhibit the growth of blast colonies from FLT3 ITD-positive as compared to ITD-negative patients with AML, without significantly affecting colony formation by normal human progenitor cells.

C31H42N6O4

562.7

562.326

C, 66.17; H, 7.52; N, 14.94; O, 11.37

387867-13-2

Tandutinib hydrochloride;2438900-70-8

3038522

White to light yellow solid powder

1.2±0.1 g/cm3

769.5±60.0 °C at 760 mmHg

177-178°C

419.2±32.9 °C

0.0±2.6 mmHg at 25°C

1.611

3.48

1

8

10

41

783

0

O(C1=C(C([H])=C2C(=C1[H])N=C([H])N=C2N1C([H])([H])C([H])([H])N(C(N([H])C2C([H])=C([H])C(=C([H])C=2[H])OC([H])(C([H])([H])[H])C([H])([H])[H])=O)C([H])([H])C1([H])[H])OC([H])([H])[H])C([H])([H])C([H])([H])C([H])([H])N1C([H])([H])C([H])([H])C([H])([H])C([H])([H])C1([H])[H]

UXXQOJXBIDBUAC-UHFFFAOYSA-N

InChI=1S/C31H42N6O4/c1-23(2)41-25-10-8-24(9-11-25)34-31(38)37-17-15-36(16-18-37)30-26-20-28(39-3)29(21-27(26)32-22-33-30)40-19-7-14-35-12-5-4-6-13-35/h8-11,20-23H,4-7,12-19H2,1-3H3,(H,34,38)

4-[6-methoxy-7-(3-piperidin-1-ylpropoxy)quinazolin-4-yl]-N-(4-propan-2-yloxyphenyl)piperazine-1-carboxamide

MLN 518; CT 53518; D06005; NSC726292; MLN-518; MLN0518; MLN 518; MLN518; NSC 726292; CT53518; NSC-726292; CT-53518; D-06005; D 06005; Tandutinib

2934.99.9001

Powder      -20°C    3 years

                     4°C     2 years

In solvent   -80°C    6 months

                  -20°C    1 month

Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Solubility in Formulation 1: ≥ 2.5 mg/mL (4.44 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL.
Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution.

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Solubility in Formulation 2: ≥ 2.5 mg/mL (4.44 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly.
Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.

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Solubility in Formulation 3: ≥ 2.5 mg/mL (4.44 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly.

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Solubility in Formulation 4: 0.5% methylcellulose: 30mg/mL

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 (Please use freshly prepared in vivo formulations for optimal results.)