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5 protocols using chemiluminescence detection kit

1

Protein Quantification and Western Blot Analysis

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Protein concentrations in the cell lysates were determined by Nanodrop ND-1000 (Gene Co., Ltd., Hong Kong, china). Once protein concentrations were determined, 50 µl of the protein specimens were denatured in 50 µl of 2×sample buffer (125 mmol/L Tris-HCl, pH 6.8, 20% glycerol, 10% β-mercaptoethanol, 0.02% bromophenol blue, and 4% SDS). Briefly, 30 µg of denatured protein were separated using a sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and transferred to a polyvinyl difluoride (PVDF) membrane, which was blocked in 5% milk proteins that were suspended in tris-buffered saline tween-20 (TBST) for 2 h at room temperature. The membrane was rinsed three times with TBST followed by incubation with the primary antibody (Cell Signaling Technology, Inc, USA) overnight at 4°C. The membrane was then washed and treated with anti-rabbit secondary antibodies that were conjugated with horseradish peroxidase at a 1∶5000 dilution (Bioworld Technology Inc, USA). The immunoreactive proteins were visualized with a chemiluminescence detection kit (PerkinElmer, USA), and the expression of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) protein was used as the loading control across all samples analyzed by Western blot.
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2

Western Blot Analysis of ATII and RLE Cells

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After treatment, ATII and RLE cells were washed in ice-cold phosphate-buffered saline (PBS) and solubilized in cell lysis buffer (Cell Signaling). The lysates were cleared by centrifugation for 10 min at 14,000 × g. Protein concentrations were determined by the Bradford assay using a commercial dye reagent (Bio-Rad), and samples containing equal amounts of protein were separated by SDS-PAGE and transferred onto nitrocellulose membranes (GE Healthcare Life Sciences) by using a Trans-Blot Turbo (Bio-Rad) transfer system. The following commercially available antibodies and dilutions were used for Western blotting: mouse anti-Na,K-ATPase subunit α1 (clone 464.6; 1:10,000) was from EMD Millipore; rat anti-STIM1 (1:1000) was from Cell Signaling Technology. Primary antibodies were detected with horseradish peroxidase-conjugated secondary goat anti-mouse antibodies (1:10,000; Bio-Rad) or goat anti-rabbit antibodies (1:2,000; Cell Signaling Technology) by using a chemiluminescence detection kit (Perkin-Elmer Life Sciences). Quantification of protein levels was performed by densitometric scanning with ImageJ 1.29X (NIH).
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3

Western Blot Quantification of ELAVL1 and GSK3β

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Protein concentration was quantified by Bradford assay (Bio-Rad, Hercules/CA USA), and proteins were resolved in 12% polyacrylamide gel. Thereafter, proteins were transferred to nitrocellulose membranes (Santa Cruz Biotechnology Dallas/TX, USA) using a semi-dry transfer apparatus (Bio-Rad, Munich, Germany). Incubation with ELAVL-1/HuR (HuR 3A2) antibody 1:5000 (sc-5261, Santa Cruz Biotechnology) respectively GSK3β antibody 1: 2000 (cell signaling #9315) were performed overnight at 4°C. Blots were developed with a chemiluminescence detection kit (Perkin Elmer Inc. Waltham/MA USA), as recommended by the manufacturer.
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Immunoblot Analysis of Runx2 and Cell Cycle

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Runx2 and cell cycle markers were analyzed by immuno-blot analysis as described previously (Galindo et al., 2005 (link); Galindo et al., 2007 (link)). Briefly, equal amounts of total cellular protein collected in the presence of the proteasome inhibitor MG132 (Calbiochem, San Diego, CA, USA) and Complete® cocktail of protease inhibitor (Roche Diagnostics, Mannhein, Germany) were resolved in 10% SDS-PAGE and transferred to polyvinylidene difluoride membranes (Immobilon-P; Millipore, Billerica, MA.). Blots were incubated with a 1:2,000 dilution of each primary antibody for 1 h. Rabbit polyclonal antibodies (Cdk4, sc-260; cyclin A, sc-596), mouse monoclonal antibody (cyclin D1, sc-20044), and goat polyclonal antibody (actin, sc-1615) were acquired commercially (Santa Cruz Biotechnology, Inc.). Runx2-specific mouse monoclonal 8G5 antibody was obtained from MBL International (Woburn, MA). Membranes with bound primary antibodies were incubated with horseradish peroxidase-conjugated secondary antibodies (Santa Cruz Biotechnology, Inc.) for 1 h. Immuno-reactive protein bands were visualized on a film (BioMax, Kodak) using a chemiluminescence detection kit (PerkinElmer Life Sciences), and signal intensities were quantitated by densitometry. Each experiment was repeated at least three times.
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5

Western Blot Analysis of Lung Proteins

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Cells were homogenized in lysis buffer (Cell Signaling Technology). Lung samples were homogenized on ice with cold lysis buffer in a 10-fold (w/w) excess of lysis buffer with pH of 7.6 (Roche) using a Polytron PT 10–35 homogenizer (Thermo Fisher Scientific). The protein concentration was quantified by the Bradford assay (Bio-Rad), and proteins were resolved on 7.5 or 12.5% polyacrylamide gels. Thereafter, proteins were transferred to nitrocellulose membranes (Bio-Rad) using a Trans-Blot Turbo transfer system (Bio-Rad). Incubation with specific antibodies was performed overnight at 4°C. Blots were developed with a chemiluminescence detection kit (PerkinElmer Life Sciences), as recommended by the manufacturer. The bands were quantified by densitometric scanning (ImageJ). Anti-β-tubulin (Santa Cruz Biotechnology) and total Mlc (Cell Signaling Technology) antibodies were used as loading controls.
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