Imatinib (STI571)

Imatinib (STI571) is a multi-target inhibitor of v-Abl, c-Kit and PDGFR with IC50 of 0.6 μM, 0.1 μM and 0.1 μM in cell-free or cell-based assays, respectively.

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Imatinib (STI571) Chemical Structure

Imatinib (STI571) Chemical Structure
Molecular Weight: 493.6

Validation & Quality Control

Product Use Citation(33)

Customer Product Validation(4)

Quality Control & MSDS

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Product Description

Biological Activity

Description Imatinib (STI571) is a multi-target inhibitor of v-Abl, c-Kit and PDGFR with IC50 of 0.6 μM, 0.1 μM and 0.1 μM in cell-free or cell-based assays, respectively.
Targets PDGFR [1]
(Cell-free assay)
c-Kit [2]
(M-07e cells)
v-Abl [1]
(Cell-free assay)
IC50 100 nM 100 nM 600 nM
In vitro In vitro assays for inhibition of a panel of tyrosine and serine/threonine protein kinases show that Imatinib inhibits the v-Abl tyrosine kinase and PDGFR potently with an IC50 of 0.6 and 0.1 μM, respectively. [1] Imatinib inhibits the SLF-dependent activation of wild-type c-kit kinase activity with a IC50 for these effects of approximately 0.1 μM, which is similar to the concentration required for inhibition of PDGFR. [2] Imatinib exhibits growth-inhibitory activity on the human bronchial carcinoid cell line NCI-H727 and the human pancreatic carcinoid cell line BON-1 with an IC50 of 32.4 and 32.8 μM, respectively. [3] A recent study shows that Imatinib has the potential to exert its antileukemia effects in chronic myelogenous leukemia by down-regulating hERG1 K(+) channels, which are highly expressed in leukemia cells and appear of exceptional importance in favoring leukemogenesis. [4]
In vivo Imatinib produces a different antitumor effect on three xenografted tumors derived from surgical samples of fresh human small cell lung cancers, with 80%, 40% and 78% growth inhibition of SCLC6, SCLC61 and SCLC108 tumors, respectively, and no significant inhibition of SCLC74 growth. [5] In high fat fed ApoE(-/-) mice, Imatinib significantly reduces the high fat-induced lipid staining area by 30%, 27% and 35% compared to high-fat diet untreated controls when dosed by gavage at 10, 20 and 40 mg/kg, respectively, and suppresses carotid artery lipid accumulation. [6]

Protocol(Only for Reference)

Kinase Assay: [1]

PDGF receptor kinase activity PDGF receptor is immunoprecipitated from BALB/c 3T3 cell extracts with rabbit antiserum to the murine PDGF receptor for 2 hours on ice. Protein A-Sepharose beads are used to collect the antigen-antibody complexes. The immunoprecipitates are washed twice with TNET (50 mM Tris, pH 7.5, 140 mM NaCl, 5 mM EDTA, 1% Triton X-100), once with TNE (50 mM Tris, pH 7.5, 140 mM EDTA), and once with kinase buffer (20 mM Tris, pH 7.5,10 mM MgCl2). After stimulation with PDGF (50 ng/mL) for 10 minutes at 4 °C, different concentrations of drug are added to the reaction mixture. PDGF receptor kinase activity is determined by incubation with 10 μCi [7-33P]-ATP and l μM ATP for 10 minutes at 4 °C. Immune complexes are separated by SDS-PAGE on 7.5% gels.

Cell Assay: [3]

Cell lines BON-1 cells and NCI-H727 cells
Concentrations ~100 μM
Incubation Time 48 hours
Method BON-1 cells and NCI-H727 cells are seeded into flat-bottomed 96-well plates in triplicate and allowed to adhere overnight in 10% fetal bovine serum-supplemented DMEM or RPMI 1640 complete medium, respectively; the medium is then exchanged for serum-free medium (negative control) or serum-free medium containing serial dilutions of Imatinib. After 48 hours (control cultures do not reach confluence), the number of metabolically active cells is determined by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, and absorbance is measured in a Packard Spectra microplate reader at 540 nm. Growth inhibition is calculated using the following formula: inhibition rate = (1 − a / b) × 100%, where a and b are the absorbance values of the treated and control groups, respectively.

Animal Study: [5]

Animal Models SCLC6, SCLC61, SCLC 74 and SCLC108 small cell lung cancers are injected into Swiss mice (nu/nu, female).
Formulation Imatinib is diluted in water.
Dosages 70 or 100 mg/kg
Administration Administered via i.p.

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

SpeciesMouseRatRabbitGuinea pigHamsterDog
Weight (kg)
Body Surface Area (m2)0.0070.0250.
Km factor36128520
Animal A (mg/kg) = Animal B (mg/kg) multiplied by  Animal B Km
Animal A Km

For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.

Rat dose (mg/kg) = mouse dose (22.4 mg/kg) ×  mouse Km(3)  = 11.2 mg/kg
rat Km(6)


[1] Buchdunger E, et al. Proc Natl Acad Sci USA. 1995, 92(7), 2558–2562.

[2] Heinrich MC, et al. Blood. 2000, 96(3), 925-932.

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Clinical Trial Information( data from, updated on 2015-08-29)

NCT Number Recruitment Conditions Sponsor
Start Date Phases
NCT02462538 Not yet recruiting ALK+ Anaplastic Large Cell Lymphoma Arbeitsgemeinschaft medikamentoese Tumortherapie June 2015 Phase 1|Phase 2
NCT02413736 Recruiting Sarcoma Heikki Joensuu|Scandinavian Sarcoma Group|Helsinki Univer  ...more Heikki Joensuu|Scandinavian Sarcoma Group|Helsinki University Central Hospital May 2015 Phase 3
NCT02268435 Withdrawn Gastrointestinal Stromal Tumors Asan Medical Center March 2015 Phase 1
NCT02363361 Not yet recruiting Cervical Spinal Cord Injury Professor Mikael Svensson, MD PhD|Karolinska University H  ...more Professor Mikael Svensson, MD PhD|Karolinska University Hospital March 2015 Phase 2
NCT02317159 Not yet recruiting Chronic Myeloid Leukemia Cttq|Ruijin Hospital February 2015 Phase 4

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Chemical Information

Download Imatinib (STI571) SDF
Molecular Weight (MW) 493.6


CAS No. 152459-95-5
Storage 3 years -20℃powder
6 months-80℃in solvent
Synonyms CGP057148B, ST-1571
Solubility (25°C) * In vitro DMSO 3 mg/mL (6.07 mM)
Water <1 mg/mL (<1 mM)
Ethanol <1 mg/mL (<1 mM)
In vivo
* <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.
Chemical Name 4-​[(4-​methyl-​1-​piperazinyl)​methyl]​-​N-​[4-​methyl-​3-​[[4-​(3-​pyridinyl)​-​2-​pyrimidinyl]​amino]​phenyl]​-benzamide

Customer Product Validation (4)

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Source FASEB J 2011 25, 3661-3673. Imatinib (STI571) purchased from Selleck
Method Apoptosis assay
Cell Lines Ba/F3-p210T315I cells
Concentrations 0-5 μM
Incubation Time 24 h
Results In a parallel study using imatinib/PDMP or nilotinib/PDMP combinations, to our surprise, similar significant synergy in Ba/F3-p210T315I cells was observed.

Click to enlarge
Source Leukemia Res 2012 36, 1311-1314. Imatinib (STI571) purchased from Selleck
Method Thymidine uptake Uptake assay
Cell Lines K562, MEG-01 cells
Concentrations 0.1-10 uM
Incubation Time 20 min
Results The effect of imatinib on nucleoside transport was first examined with thymidine. At a 10-M concentration, imatinib was able to inhibit the entry of radiolabeled thymidine in K562 cells by 76%. Imatinib was still efficient and blocked by 43% the entry of thymidine at 1 uM, but its effect on thymidine transport at 0.1 uM was not significant (Fig. 1a).

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Source Dr. Thomas Kruwel of Fraunhofer. Imatinib (STI571) purchased from Selleck
Method Cell Viability assay
Cell Lines A2C12/BetaD5/GammaA3/GammaD12/A549/CaCo2/HepG2 cell lines
Concentrations 0.0001-1000 nM
Incubation Time 24/96 h

Click to enlarge
Source Dr. Helen Rizos from the university of Sydney. Imatinib (STI571) purchased from Selleck
Method Western blot
Cell Lines MelMS melanoma cell line
Concentrations 50 nM
Incubation Time 24/72 h

Product Use Citation (33)

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