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5 protocols using nitazoxanide

1

Nitazoxanide and Chk1 Inhibitors Protocol

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Nitazoxanide (NTZ) and the cell cycle checkpoint kinase 1 (Chk1) inhibitors MK-8776 and Prexasertib HCl were purchased from Selleck Chemicals (Selleck, Houston, TX, USA). The anti-VP2 monoclonal antibody was purchased from Ingenasa (Ingenasa, Madrid, Spain). Beta-actin monoclonal antibody was purchased from Thermo Fisher (Thermo Fisher, Waltham, MA, USA). The ProteinExt® Mammalian Total Protein Extraction Kit was purchased from TransGen (TransGen Biotech, Beijing, China). Total RNA extraction was conducted using the RNeasy Mini Kit (QIAGEN, Hilden, Germany). The reverse transcription kit FastKing RT Kit (With gDNase) and quantitative PCR kit SuperReal PreMix Plus (SYBR Green) were purchased from TIANGEN (TIANGEN, Beijing, China).
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2

Comprehensive Chemical Compound Library

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Emetine (HY–B1479A, 99.81%, LCMS), salinomycin (HY-15597, >98%, NMR), tilorone (HY–B1080, 99.9%, LCMS), chloroquine (HY-17589, 99.9%, LCMS), homoharringtonine (HY-14944, 99.2%, LCMS), gemcitabine (HY–B0003, 99.9%, LCMS), vismodegib (HY-10440, 99.9%, LCMS), conivaptan (HY-18347A, 99.9%, LCMS), and atovaquone (HY-13832, 99.8%, LCMS) were purchased from MedChem Express (Monmouth Junction, NJ, USA); niclosamide (S3030, 99.8%, HPLC) and nitazoxanide (S1627, 99.3%, HPLC) were from Selleckchem (Houston, TX, USA); antimycin A (A8674, 97.64%, HPLC), anisomycin (A9789, >98%, HPLC) oligomycin (O4876, >90%, HPLC), valinomycin (V0627, ≧90%, HPLC) and crystal violet (C0775, Dye content ≥90%) were from Sigma–Aldrich (St. Louis, MO, USA); GS-441524 (AG167808, >98%, HPLC) were from Carbosynth (San Diego, CA, USA). All chemicals were used as supplied.
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Nitazoxanide and 5-FU Cytotoxicity Protocol

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Nitazoxanide was obtained from Selleck Chemicals. For comparison and reference, the standard cytotoxic drug 5-FU (Sigma-Aldrich; Merck KGaA) was included. 5-FU is the backbone therapy for colorectal cancer chemotherapy regimens and is also in clinical use as a radiosensitizer (1 (link),14 (link)).
The oxygen and moisture free MiniPod™ system (Roylan Developments Ltd.) was used to store source plates that were prepared with drugs solubilized in DMSO. The liquid handling system ECHO® 550 (Labcyte, Inc.) was used to add the drugs to the experimental plates.
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4

Investigating NOX2 and ATM Inhibitors

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Nitazoxanide and Clotrimazole were obtained from Selleckchem and solubilized in DMSO (used as vehicle control in all experiments with these compounds). Ultrapure LPS for cell culture experiments (Lipopolysaccharide from Escherichia coli 0111:B4) was purchased from Invivogen. NOX2 inhibitor GSK2795039 was obtained from MedChem Express. ATM inhibitor KU-55933 was from Cell Signaling Technology.
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5

Cell Proliferation Assay and Western Blot Analysis

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HeLa, MGC803, A549 and 293 T cells were maintained in Dulbecco’s modified Eagles medium (Hyclone) supplemented with 10% (v/v) fetal bovine serum (Biological Industries) and transfected with polyethyleneimine (PEI) transfection reagent (Thermo Scientific). Cell proliferation assay was performed with 96-well plates, seeding about 1500 cells for each well. Every plasmid was transfected in 10–12 replicates. Sulforhodamine B (SRB) staining was performed 5 days after transfection. Western blot was performed with 6-well plates, 48 h after transfection. Antibodies against Tubulin (ProteinTech,1:5000), mCherry (ProteinTech, 1:1000), Bcl-2 (SAB, 1:1000), t-ERK (SAB, 1:1000), p-ERK (SAB, 1:1000), β-catenin (SAB, 1:1000), CyclinD1 (ProteinTech, 1:1000) and c-Myc (ProteinTech, 1:1000) were used. Stable cell lines were generated using lentiviral infection of HeLa cells in pLVX-IRES-Neo plasmids. Inhibitors against ERK (PD98059, Selleck), c-Myc (10058-F4, MCE), Cyclin D1 (Fascaplysin, Santa Cruz) and β-catenin (Nitazoxanide, Selleck) were purchased.
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