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4 protocols using ecl plus solution

1

Protein Expression Quantification Protocol

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MTT solution, mouse monoclonal anti-β-actin, NA, NMN and NAD were obtained from Sigma (St. Louis, MO, USA). The antibodies against (PAK4, p-PAK4, β-catenin, p-β-catenin, cycline D1, c-Myc, β-actin (rabbit), PARP, Sirtuin 1) were from cell signaling Technology, Inc. (Beverly, MA, USA). Goat anti-mouse and goat anti-rabbit HRP conjugated IgG were obtained from Bio-Rad (Hercules, CA). Anti-NAMPT was from Bethyl Laboratories (Montgomery, TX, USA), anti-NAPRT1 was from Proteintech (Rosemont, IL 60018, USA). ECL Plus solution was from Thermo-Fisher Scientific (Waltham MA, USA). KPT-9274 and its vehicle were from Karyopharm Therapeutics (Newton, MA, USA). FK866 was from TOCRIS Biosciences. Sunitinib was obtained from LC laboratories (Woburn, MA).
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2

Antibody Characterization and Inhibitor Preparation

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PARP antibody was purchased from Cell Signaling Technology, Inc. (Beverly, MA, USA), goat anti-mouse and goat anti-rabbit HRP-conjugated IgG from Bio-Rad (Hercules, CA), anti-nuclear factor erythroid related factor 2 (NRF2) antibody from Abcam (Cambridge, MA) and ECL Plus solution from Thermo-Fisher Scientific (Waltham MA, USA). CB-839 was supplied by Calithera, Inc. (South San Francisco, CA) and was dissolved either in DMSO for in vitro experiments (10 mM stock, stored at -20 0C) or in vehicle for in vivo experiments. The in vivo vehicle consisted of 25% (w/v) hydroxypropyl-β-cyclodextrin in 10 mmol/L citrate (pH 2). The GLS inhibitor BPTES (bis-2-(5-phenylacetamido-1,2,4-thiadiazol-2-yl)ethyl sulfide) and all other reagents were purchased from Sigma (St. Louis, MO)
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3

Protein Expression Analysis in Lung Cancer

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Cells were lysed with RIPA buffer and proteins were separated on 13% SDS-PAGE and transferred onto a PVDF membrane. The membrane was stained immunochemically using anti-KEAP1, NRF2, NQO1, TXNRD1 (Proteintech, Chicago, IL, USA), and by using anti-AKR1C1 (Abnova, Taiwan). H720 and H727 cells were cultured in RPMI 1640, supplemented with 10% FBS and antibiotics. Equal amounts of protein lysates (35 μg) were resolved by SDS-PAGE (13% acrylamide) under reducing conditions and transferred onto PVDF membranes (Immobilon PVDF, Millipore, Billerica, MA, USA). After transfer, PVDF membranes were blocked with 5% non-fat milk and incubated with primary antibody overnight at 4 °C. Rabbit anti-NRF2 (Proteintech), rabbit anti-NQO1 (Proteintech), rabbit anti-TXNRD1 (Proteintech), mouse anti-AKR1C1 (Abnova) and anti-Actin (Sigma-Aldrich, St. Louis, MO, USA) were incubated overnight at 4 °C. PVDF membranes were incubated with ECL plus solution following the manufacturer’s instructions (Thermo Fisher Scientific, Rockford, IL, USA). Chemiluminescence signals were acquired by ChemiDoc XRS (Biorad, Hercules, CA, USA).
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Quantitative α-SMA Protein Analysis

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Chemiluminescence western blot techniques were used to assess the α-SMA protein relative to the total protein (Ponceau stain). Polyvinylidene difluoride (PVDF) membranes (Bio-Rad) were used and probed for the primary α-SMA antibody (Abcam, 1:1000) diluted in blocking solution (5% skim milk) at 4 °C. Membranes were incubated with a secondary goat-anti-mouse horseradish peroxidase conjugated antibody (Jackson ImmunoResearch, 1:5000) for 1 h at RT. The chemiluminescence signal was detected using Pierce enhanced chemiluminescence (ECL) Plus solution (ThermoFisher Scientific) and an ImageQuant LAS 4000 detector.
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