Catalog No.S1155

S3I-201 shows potent inhibition of STAT3 DNA-binding activity with IC50 of 86 μM in cell-free assays, and low activity towards STAT1 and STAT5.

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S3I-201 Chemical Structure

S3I-201 Chemical Structure
Molecular Weight: 365.36

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Product Description

Biological Activity

Description S3I-201 shows potent inhibition of STAT3 DNA-binding activity with IC50 of 86 μM in cell-free assays, and low activity towards STAT1 and STAT5.
Targets STAT3 [1]
(Cell-free assay)
IC50 86 μM
In vitro S3I-201 inhibits growth and induces apoptosis preferentially in tumor cells that contain persistently activated Stat3 by inhibiting Stat3·Stat3 complex formation and Stat3 DNA-binding and transcriptional activitie. Moreover, S3I-201 also inhibits the expression of the Stat3-regulated genes encoding cyclin D1, Bcl-xL, and survivin. [1] S3I-201 inhibits breast carcinoma MDA-MB-435, MDA-MB-453 and MDA-MB-231 cell lines with IC50 of 100 μM. In addition, the cells with impaired TGF-β signaling are four times as sensitive to the STAT3 inhibitor S3I-201. [2] A recent study shows that S3I-201 potentiates the antiproliferative effect of cetuximab in HepG2 and Huh-7 cells via the STAT3 signalling pathway. [3]
Cell Data
Cell LinesAssay TypeConcentrationIncubation TimeFormulationActivity DescriptionPMID
GC MkK0S5Jwf3SqIFnubIljcXSrb36gRZN{[Xl?MUi1NE0yOjVizszNMnTvO|IhcA>?M1XPSIF1fGWwdXH0[ZMhfGinIHPlcIwh\3Kxd4ToJIlvKGFiZH;z[U1l\XCnbnTlcpQhdWGwbnXyM1zldFI2Pzd2NUCz
H460 MVzBdI9xfG:|aYOgRZN{[Xl?M{\TPVExOMLibl2=M1XvPFI1yqCqNWS2R|lRcW6mdXPld{Bk\WyuIHHwc5B1d3OrczDjc{11emWjdHXkJJdqfGhiQlXaNlM2MmfMNlQ1PzJ3M{i=
H460 MmHtRZBweHSxc3nzJGF{e2G7NGfWNnYyODEEoH7NM1r3XVI1yqCqNXfJRWl{\W6qYX7j[ZMh[2WubDDk[YF1cCClbz30doVifGWmIIfpeIghVFl{OUSwNFI>MlfmNlQ1PzJ3M{i=
U373 M3TrUGdzd3e2aDDJcohq[mm2aX;uJGF{e2G7MW[xNlUh|ryPM3zqdFI1KGh?NGDSNGpFVVORM3zjW4Rqe3K3cITzJHNVSVR|IIPp[45idGmwZzDhcoQheHKxbHnm[ZJifGmxbh?=NXvxT4k3OjRyN{C4NlA>
T-cell NYj0UJhMT3Kxd4ToJGlvcGmkaYTpc44hSXO|YYm=NXPndHhTUUN3ME21NEDPxE1?NV[yV5RsOjRyNki3N|E>
H460 NUGwd|lETnWwY4Tpc44hSXO|YYm=M4X4dFUxNzFyMDFOwG0>M{DQR|Q5KGh?NWDmVId[cW6qaXLpeJMhfGinIGP0ZZQ{SyCrbnPy[YF{\WRibXnSMVkz[SCneIDy[ZN{cW:wM362bVI{QDJyMkW0
PLC/PRF/5 M{DveWdzd3e2aDDJcohq[mm2aX;uJGF{e2G7Ml3qNVAxKG6PMX:0PEBpNXztbHlNTE2VTx?=NVP3SI5bcW6qaXLpeJMhfGinIFnMMVYhe3SrbYXsZZRqd25icILvcY91\WRiY3XscEBxem:uaX\ldoF1cW:wMlHyNlM{PjR|OEm=
HUVEC MV;GeY5kfGmxbjDBd5NigQ>?NYfufnI{OC53LUKwJO69VQ>?MkK3NlQhcA>?MXjEUXNQNWWxcZZCe3WycILld5NmeyC2aHWgbJlxd3irYT3pcoR2[2WmIHHjZ5VufWyjdHnvckBw\iCKSV[tNe6yM3;MT|IyPTJ|NUW5
 U-373 MGNUXDO5NCS3m2b4TvfIlkcXS7IFHzd4F6MnfpN{8yOCEQvF2=MV6yOEBpMn[zdoVlfWOnczDGUk3Puy2rbnT1Z4VlKGOnbHygcoV2em:2b4jpZ4l1gQ>?M2q2PFIxQDh6NEG2
U373 NFHl[JFIem:5dHigTY5pcWKrdHnvckBCe3OjeR?=NVnMTIpvPzJiaB?=M3jwfWlEPTB;NUKuOUDPxE1?NGfNOWQzODB5Mk[1Ni=>

... Click to View More Cell Line Experimental Data

In vivo S3I-201 (5 mg/kg, i.v. every 2 or every 3 days) shows the antitumor efficacy in mouse models with human breast tumor xenografts that harbor constitutively active Stat3. [1] S3I-201 treatment reduces Varicella-zoster virus (VZV) replication on the basis of the bioluminescence signal and the number of positive skin xenografts compared with DMSO-treated mice by inhibiting STAT3 phosphorylation. [4]
Features A chemical probe inhibitor of Stat3 activity.

Protocol(Only for Reference)

Kinase Assay: [1]

In vitro Stat3 DNA-binding assay and EMSA analysis Briefly, 100 mL of biotinyl-e-Ac-EPQpYEEIEL-OH (in 50 mM Tris/150 mM NaCl, pH 7.5) is added to each well of streptavidin-coated 96-well microtiter plates and incubated with shaking at 4 °C overnight. Then plates are rinsed with PBS/Tween 20 and then two times with 200 mL of BSA-T-PBS (0.2% BSA/0.1% Tween 20/PBS). Then 50 mL of Lck-SH2-GST fusion protein (6.4 ng/ml in BSA-T-PBS) is added to each well of the 96-well plate in the presence and absence of 50 mL of S3I-201 (for 30 and 100 mM final concentrations), and the plate is shaken at room temperature for 4 hours. After solutions are removed, each well is rinsed four times with BSA-T-PBS (200 mL), and 100 mL of polyclonal rabbit anti-GST antibody (100 ng/mL in BSA-T-PBS) is added to each well and incubated at 4 °C overnight. After washing with BSA-T-PBS, 100 mL of 200 ng/mL BSA-T-PBS horseradish peroxidase-conjugated mouse anti-rabbit antibody is added to each well and incubated for 45 minutes at room temperature. After four washing steps with BSA-T-PBS and three washing steps with PBS-T, 100 mL of peroxidase substrate is added to each well and incubated for 5-15 minutes. The peroxidase reaction is stopped by adding 100 mL of 1 M sulfuric acid solution, and absorbance is read at 450 nm with an ELISA plate rea

Cell Assay: [2]

Cell lines MDA-MB-435, MDA-MB-453 and MDA-MB-231 cells lines
Concentrations ~ 250 μM
Incubation Time 72 hours
Method The MTT assay is based on the conversion of the yellow tetrazolium salt MTT to purple formazan crystals by metabolically active cells. The MTT assay provides a quantitative determination of viable cells. Cells are seeded in 96-well microplates in complete culture medium in the absence or presence of increasing serial dosages of S3I-201 as indicated. At 72 hours after culture, the number of viable cells is measured by adding 100 μL/well of 2 mg/mL MTT solution. After 2 hours, the medium is removed, and the formazan crystals are dissolved by adding 100 μL dimethylsulfoxide per well. The absorbance is read at 590 nm with an enzyme-linked immunosorbent assay reader. Each treatment point is performed in 10 wells or sextuplicate.

Animal Study: [1]

Animal Models Human breast cancer MDA-MB-231 cells are injected s.c. into the left flank of athymic nu/nu mice.
Formulation S3I-201 is formulated in DMSO.
Dosages ≤5 mg/kg
Administration Administered via i.v.

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] Siddiquee K, et al. Proc Natl Acad Sci U S A, 2007, 104(18), 7391-7396.

[2] Lin L, et al. Oncogene, 2009, 28(7), 961-972.

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Chemical Information

Download S3I-201 SDF
Molecular Weight (MW) 365.36


CAS No. 501919-59-1
Storage 3 years -20℃powder
2 years -80℃in solvent
Synonyms NSC 74859
Solubility (25°C) * In vitro DMSO 73 mg/mL (199.8 mM)
Water <1 mg/mL
Ethanol <1 mg/mL
In vivo 5% DMSO, 95% PEG 300 15 mg/mL
* <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 2-hydroxy-4-(2-(tosyloxy)acetamido)benzoic acid

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
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