Napabucasin (BBI608) | STAT inhibitor | CAS 83280-65-3

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Quality Control

Batch: Purity: 99.72%

99.72

Related Targets	EGFR JAK Pim
Other STAT Products	Stattic NSC 74859 (S3I-201) Cryptotanshinone (Tanshinone C) SH-4-54 C188-9 (TTI-101) BP-1-102 HO-3867 Nifuroxazide AS1517499 Homoharringtonine (HHT)

Cell Culture, Treatment & Working Concentration

Cell Lines	Assay Type	Concentration	Incubation Time	Activity Description	PMID
human DU145 cells	Function assay		72 h	Anticancer activity against human DU145 cells after 72 hrs by XTT assay, IC50=0.02304 μM	18829316
human HaCaT cells	Function assay		48 h	Antihyperproliferative activity against human HaCaT cells after 48 hrs by phase contrast microscopy, IC50=0.5 μM	22845014
human HaCaT cells	Proliferation assay			Antiproliferative activity against human HaCaT cells, IC50=0.5 μM	10479319
KB cells	Cytotoxicity assay			Effective cytotoxic dose against KB cells was evaluated, ED50=4.2 μM	9873618
MDA-MB-231	Cytotoxicity assay		72 hrs	Cytotoxicity against human MDA-MB-231 cells assessed as growth inhibition after 72 hrs by MTT assay, IC50 = 0.34 μM.	28558333
HepG2	Cytotoxicity assay		72 hrs	Cytotoxicity against human HepG2 cells assessed as growth inhibition after 72 hrs by MTT assay, IC50 = 0.66 μM.	28558333
A549	Cytotoxicity assay		72 hrs	Cytotoxicity against human A549 cells assessed as growth inhibition after 72 hrs by MTT assay, IC50 = 0.74 μM.	28558333
K562	Antiproliferative assay		48 hrs	Antiproliferative activity against human K562 cells measured after 48 hrs by MTT assay, IC50 = 1 μM.	30003778
MDA-MB-231	Function assay		4 hrs	Inhibition of STAT3 phosphorylation at Y705 in human MDA-MB-231 cells assessed as reduction in ratio of phosphorylated STAT3 to total STAT3 level after 4 hrs by HTRF assay, EC50 = 1.9 μM.	30003778
MDA-MB-231	Function assay		4 hrs	Inhibition of STAT3 phosphorylation at Y705 in human MDA-MB-231 cells after 4 hrs by HTRF assay, EC50 = 2 μM.	30003778
MDA-MB-231	Antiproliferative assay		48 hrs	Antiproliferative activity against human MDA-MB-231 cells measured after 48 hrs by MTT assay, IC50 = 2.1 μM.	30003778
HepG2	Antiproliferative assay		48 hrs	Antiproliferative activity against human HepG2 cells after 48 hrs by CCK-8 assay, IC50 = 10.2 μM.	29604543
L02	Antiproliferative assay		48 hrs	Antiproliferative activity against human L02 cells after 48 hrs by CCK-8 assay, IC50 = 18.7 μM.	29604543
MDA-MB-231	Function assay	100 uM	1 hr	Binding affinity to STAT3 in human MDA-MB-231 cells at 100 uM treated for 1 hr followed by thermolysin addition measured after 30 mins by DARTS-Western blot analysis	30003778
MDA-MB-231	Function assay	5 umol/L	24 hrs	Induction of superoxide generation in human MDA-MB-231 cells at 5 umol/L measured after 24 hrs by DHE staining based flow cytometry	30003778
MDA-MB-231	Function assay	5 umol/L	24 hrs	Induction of superoxide generation in human MDA-MB-231 cells at 5 umol/L measured after 24 hrs in presence of NQO1 inhibitor dicoumarol by DHE staining based flow cytometry	30003778
Click to View More Cell Line Experimental Data

Solubility

In vitro
Batch:

DMSO : 14 mg/mL (58.28 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO.)

Water : Insoluble

Ethanol : Insoluble

Molarity Calculator

Mass	Concentration	Volume	Molecular Weight
Mass value Mass unit	Concentration value Concentration unit	Volume value Volume unit	Molecular weight (g/mol)

Dilution Calculator Molecular Weight Calculator

In vivo batch selection In vivo Batch:
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution	10%DMSO 1 40%PEG300 2 5%Tween80 3 45%ddH2O Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.	0.250mg/ml (1.04mM)	Taking the 1 mL working solution as an example, add 100 μL of 2.5 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 450 μL of ddH2O to make it clear. Volume up to 1 mL. The mixed solution should be used immediately for optimal results.
Homogeneous suspension	CMC-NA	≥5mg/ml	Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

Dosage: mg/kg

Average weight of animals: g

Dosing volume per animal: μL

Number of animals:

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO

%

% Tween 80

% ddH₂O

% DMSO

+

%

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Chemical Information, Storage & Stability

Molecular Weight	240.21	Formula	C₁₄H₈O₄	Storage (From the date of receipt)	3 years-20°Cpowder
CAS No.	83280-65-3	Download SDF		Storage of Stock Solutions	1 year-80°Cin solvent 1 month-20°Cin solvent
Synonyms	BBI608			Smiles	CC(=O)C1=CC2=C(O1)C(=O)C3=CC=CC=C3C2=O

Mechanism of Action

Targets/IC₅₀/Ki	Stat3
In vitro	Napabucasin downregulates stemness gene expression driven by Stat3 and cancer stemness properties, and effectively inhibits self-renewal of stemness-high cancer cells with IC50 ranged from 0.291~1.19 μM, on inhibition on normal stem cells.
In vivo	In mice bearing PaCa-2 xenografts, Napabucasin (20 mg/kg, i.p.) significantly inhibits tumor growth, relapse and metastasis.
References	[1] https://pubmed.ncbi.nlm.nih.gov/25605917/

Applications

Methods	Biomarkers	PMID
Western blot	CDK4 / Cyclin D1 STAT3 / β-catenin / c-Myc c-Myc / Nanog / Bmi-1 / Axl / Sox2 / Klf4 / β-catenin / Survivin	31277685
Immunofluorescence	STAT3 Cleaved caspase-3	31277685
Growth inhibition assay	Cell viability	31277685

Clinical Trial Information

(data from https://clinicaltrials.gov, updated on 2024-05-22)

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
NCT03525405	Completed	ADME\|Healthy	Sumitomo Pharma America Inc.	May 18 2018	Phase 1
NCT03416816	Terminated	Neoplasms	Sumitomo Pharma America Inc.\|Syneos Health	May 15 2018	Phase 1
NCT02279719	Completed	Hepatocellular Carcinoma	Sumitomo Pharma America Inc.	December 2014	Phase 1\|Phase 2

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Handling Instructions

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Napabucasin (BBI608) STAT inhibitor

Chemical Structure

Molecular Weight: 240.21