Catalog No.S3030

Niclosamide can inhibit DNA replication and inhibit STAT with IC50 of 0.7 μM in a cell-free assay.

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Niclosamide Chemical Structure

Niclosamide Chemical Structure
Molecular Weight: 327.12

Validation & Quality Control

Quality Control & MSDS

Related Compound Libraries

Niclosamide is available in the following compound libraries:

Product Information

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Product Description

Biological Activity

Description Niclosamide can inhibit DNA replication and inhibit STAT with IC50 of 0.7 μM in a cell-free assay.
Targets STAT3 [1]
(Cell-free assay)
IC50 0.7 μM
In vitro Niclosamide (< 5 μM) dose dependently inhibits STAT3-mediated luciferase reporter activity with IC50 of 0.25 μM in HeLa cells. Niclosamide(< 2 μM) dose dependently inhibits the phosphorylation of STAT3 in Du145 cells. Niclosamide (1 μM) inhibits the EGF-induced nuclear translocation of STAT3 in Du145 cells. Niclosamide(< 2 μM) dose dependently inhibits the transcription of STAT3 downstream genes in Du145 cells. Niclosamide(< 10 μM) dose dependently induces G0/G1 arrest and apoptosis of Du145 cancer cells. [1] Niclosamide is able to inhibit SARS-CoV replication at a micromolar concentration in Vero E6 cells infected with SARS-CoV. [2] Niclosamide(< 7.5 μM) promotes Frizzled1 endocytosis, downregulates Dishevelled-2 protein, and inhibits Wnt3A-stimulated beta-catenin stabilization and LEF/TCF reporter activity in U2OS cells. [3] Niclosamide inhibits the TNF-induced NF-κB reporter activity in a dose- and time-dependent manner in U2OS cells. Niclosamide(125 nM) inhibits NF-κB activation induced by p65, IKKα, IKKβ, IKKγ, and TAK1 in U2OS cells. Niclosamide(< 500 nM) completely block the time- and dose-dependent TNFα-induced alteration of the NF-κB–DNA complex in HL-60 cells. Niclosamide(< 10 nM) inhibits constitutive NF-κB activation in U266 cells. Niclosamide inhibits TNF-induced degradation of IκBα and relocation of p65 in a dose- and time-dependent manner in HL-60, Molm13, or AML primary cells. Niclosamide(500 nM) decreases TNF-induced NF-κB–dependent gene products involved in cell survival in HL-60 cells. Niclosamide dose dependently inhibits the growth and induces robust apoptosis of AML cells associated with decreased Mcl-1 and XIAP levels and increased intracellular ROS levels. [4]
In vivo Niclosamide(40 mg/kg/d, i.p.) inhibits growth of xenografted AML cells in nude mice bearing HL-60 xenograft tumors. [4]

Protocol(Only for Reference)

Kinase Assay:


Protein Kinase profiling assay Assay for 22 different proteins kinases is carried out by ProQinase Gmbh. All of the protein kinases are expressed either in Sf9 insect cells or in E.coli as recombinant GST-fusion proteins or His-tagged proteins. Protein kinases are purified by affinity chromatography using either GSH-agarose or Ni_NTH-agarose. A radiometric protein kinase assay is used for measuring the kinase activity of the 22 protein kinases. Briefly, for each protein kinase, 50 μL reaction cocktail containing 60 mM HEPES-NaOH, 3 mM MgCl2, 3 mM MnCl2, 3 μM Na-orthovanadate, 1.2 mM DTT, 50 μg/mL PEG20000, 1 μM [γ-33P]-ATP, Niclosamide, adequate amount of enzyme and its substrate. The PKC-alpha assay additionally contain 1 mM Cacl2, 4 mM EDTA, 5 μg/mL phosphatidylserine and 1 μg/mL 1, 2-Dioleyl-glycerol. The reaction cocktails are incubated at 37 °C for 60 minutes and stop with 50 μL 2% (v/v) H3PO4. Incorporation of 33Pi is determined with a microplate scintillation counter. The activities and the IC50 values are calculated using Quattro Workflow V2.28.

Cell Assay:


Cell lines Hela, A549, Du145, HT-29, A431, PC3 cells
Concentrations 16 μM
Incubation Time 72 hours

Cells are plated in 96-well culture plates with cell density of 3-4 × 103 cells/well and treat with Niclosamide by adding 100 μL medium containing Niclosamide of various concentrations on the second day. After 72-hour's treatment, MTT is added to each well and incubated for additional 4-5 hours, and the absorbance is measured on a microplate reader at 570nm. Cell growth inhibition is evaluated as the ratio of the absorbance of the sample to that of the control. The results are representative of at least 3 independent experiments.

Animal Study:


Animal Models nude mice bearing HL-60 xenograft tumors.
Formulation DMSO
Dosages 40 mg/kg
Administration Intraperitoneal injection

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] Ren X, et al. ACS Med Chem Lett, 2010, 1(9), 454-459.

[2] Wu CJ, et al. Antimicrob Agents Chemother, 2004, 48(7), 2693-2696.

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Clinical Trial Information( data from, updated on 2015-11-14)

NCT Number Recruitment Conditions Sponsor
Start Date Phases
NCT02532114 Not yet recruiting Hormone-Resistant Prostate Cancer|Metastatic Prostate Carcinoma|Recurrent Prostate Carcinoma|Stage IV Prostate Adenocarcinoma University of Washington|National Cancer Institute (NCI) November 2015 Phase 1
NCT02519582 Not yet recruiting Colorectal Cancer Charite University, Berlin, Germany|Center for Molecular  ...more Charite University, Berlin, Germany|Center for Molecular Medicine August 2015 Phase 2
NCT01296958 Completed Taenia Solium Taeniasis Oregon Health and Science University|Universidad Nacional  ...more Oregon Health and Science University|Universidad Nacional Mayor de San Marcos|National Institute of Neurological Disorders and Stroke (NINDS) May 2011 --
NCT00138359 Terminated Intestinal Parasitism National Institute of Allergy and Infectious Diseases (NI  ...more National Institute of Allergy and Infectious Diseases (NIAID) December 2004 --

Chemical Information

Download Niclosamide SDF
Molecular Weight (MW) 327.12


CAS No. 50-65-7
Storage 3 years -20℃powder
6 months-80℃in solvent
Synonyms Niclocide
Solubility (25°C) * In vitro DMSO <1 mg/mL (<1 mM)
Water <1 mg/mL (<1 mM)
Ethanol <1 mg/mL (<1 mM)
In vivo 1% DMSO/30% polyethylene glycol/1% Tween 80 30 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 Benzamide, 5-chloro-N-(2-chloro-4-nitrophenyl)-2-hydroxy-

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
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