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5 protocols using lumiglo

1

Western Blot Analysis of Chondrocyte Proteins

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Chondrocytes were lysed by radio immunoprecipitation assay (RIPA) lysis buffer with phenylmethylsulfonyl fluoride (PMSF) and a phosphatase inhibitor. The concentration of proteins was measured using a bicinchoninic acid (BCA) protein assay kit (Beyotime, Beyotime Biotechnology, China). The proteins (30 µg) were separated by SDS-polyacrylamide gel electrophoresis (SDS-PAGE) and were transferred to polyvinylidenedifluoride (PVDF) membranes. The membranes were blocked in a nonfat dry milk solution for 1 hour. Then, the membranes were incubated overnight at 4°C with anti-AMPK (CST, #2532, 1:1000 dilution), anti-p-AMPK (CST, #2535, 1:1000 dilution), anti-mTOR (CST, #2983, 1:1000 dilution), anti-p-mTOR (CST, #5536, 1:1000 dilution), anti-Beclin-1 (Abcam, ab207612, 1:1000 dilution), anti-ULK1 (Abcam, ab133747, 1:1000 dilution), anti-LC3 II (Abcam, ab48394, 1:1000 dilution), anti-P62 (Abcam, ab56416, 1:2000 dilution), anti-Bcl2 (Abcam, ab194583, 1:2000 dilution) and anti-Bax (Abcam, ab32503, 1:1000 dilution) primary antibodies in dilution buffer. Next, the membranes were incubated with horseradish peroxidase (HRP)-conjugated anti-rabbit or anti-mouse IgG (Zhongshan Golden Bridge Biotechnology, 1:5000 dilution) at room temperature for 1 hour. Then, the membranes were developed using the enhanced chemiluminescence substrate LumiGLO (Millipore, Bedford, MA, USA).
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2

Nuclear Protein Extraction and Western Blot

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Cells were placed on ice immediately following treatment and washed with ice-cold Hank’s Balanced Salt Solution. Nuclear proteins were prepared using the CellLytic NuCLEAR extraction kit (Sigma-Aldrich). All the wash buffers and final resuspension buffer included a 1× protease inhibitor cocktail (Pierce, Rockford, IL, USA), NaF (5 mM), and Na3VO4 (200 mM). The protein concentration of the lysate was measured using the BCA protein assay kit (Thermo Fisher). Nuclear or total cell proteins were resolved on 8 to 12% SDS-PAGE and transferred by electroblotting to nitrocellulose membranes (Bio-Rad, Hercules, CA, USA). The membranes were blocked in 5% bovine serum albumin reagent (Beyotime, Jiangsu, China) and incubated overnight at 4 °C with primary antibody dilution buffer (the dilution followed the specification; Abcam) and then incubated with horseradish peroxidase-conjugated anti-rabbit IgG (1:5000) for 2 h. Afterward, the membranes were developed using the enhanced chemiluminescence substrate LumiGLO (Millipore, Bedford, MA, USA) and exposed to X-ray film. The bands were analyzed with Gel-Pro Analyzer 4.0 (Bio-Rad, Hercules, CA, USA).
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3

Nuclear Protein Extraction and Western Blot Analysis

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Cells were placed on ice immediately following treatment and washed with ice‐cold Hank's balanced salt solution. Nuclear proteins were prepared using the CellLytic NuCLEAR extraction kit (Sigma‐Aldrich, St. Louis, MO). All the wash buffers and final resuspension buffer included 1× protease inhibitor cocktail (Pierce, Rockford, IL), NaF (5 mM), and Na3VO4 (200 mM). The protein concentration of the lysate was measured using the BCA protein assay kit (Thermo Fisher Scientific, Boston, MA). Nuclear or total cell proteins were resolved on 8% to 12% sodium dodecyl sulfate polyacrylamide gel electrophoresis and transferred by electroblotting to nitrocellulose membranes (Bio‐Rad, Hercules, CA). The membranes were blocked in nonfat dry milk solution and incubated overnight at 4°C with ColII (1:1000), aggrecan (1:1000), Runx2 (1:1000), ColX (1:1000), p65 (1:1000), p50 (1:1000), p52 (1:500), RelB (1:500), cRel (1:1000), and NICD1 (1:1000) primary antibody dilution buffer and then incubated with horseradish peroxidase‐conjugated anti‐rabbit IgG (1:5000) for 2 hours. Afterwards, the membranes were developed using the enhanced chemiluminescence substrate LumiGLO (Millipore, Bedford, MA) and exposed to X‐ray film. The bands were analyzed with Gel‐Pro Analyzer 4.0.
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4

Western Blot Analysis of Autophagy Markers

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All proteins were extracted using a radio immunoprecipitation assay (RIPA) lysis buffer with protease and phosphatase inhibitors. The protein concentration was measured using a bicinchoninic acid protein assay kit (Beyotime, Shanghai, China). Protein samples were separated using SDS-polyacrylamide gel electrophoresis (SDS-PAGE) and transferred to polyvinylidene difluoride (PVDF) membranes. The membranes were blocked with 5% non-fat milk solution for 1 h at room temperature. The membranes were then probed with anti-PPARγ (sc-7273, 1:200, Santa), anti-mTOR (#2983, 1:1000; Cell Signaling Technology), p-mTOR (#5536, 1:1000; Cell Signaling Technology), anti-ULK1 (#8054, 1:1000; Cell Signaling Technology), anti-LC3II (ab48394, 1:2000, Abcam), anti-P62 (ab56416, 1:2000; Abcam) and anti-β-actin (1:2000; Zhongshan Golden Bridge Biotechnology) overnight at 4 °C. The following day, membranes were washed three times with TBST and incubated with goat anti-rabbit or goat anti-mouse antibody IgG (H + L)-HRP (1:5000; Wuhan Sanying) for 1 h at room temperature. Finally, the membranes were visualized using the enhanced chemiluminescence substrate LumiGLO (Millipore, MA, USA).
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5

Western blot analysis of DNA damage response

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The SCNs were lysed with a cell lysate containing PMSF and phosphatase inhibitors. The cell lysates were collected and centrifuged at 14,000 rpm for 5 min. The supernatants were taken and the protein concentration was determined using a BCA kit (Beyotime Biotechnology, China). The protein sample was boiled for 10 min before loading, and then electrophoresed using 10% SDS gel, transferred to a PVDF membrane, blocked with 5% skim milk at room temperature for 1 h, and then the membranes were incubated overnight at 4°C with anti-PARP1(Abcam, ab151794, 1:1,000 dilution), anti-PAR(CST, #83732, 1:1,000 dilution), anti-γH2AX(CST, #2577, 1:1,000 dilution), anti-GAPDH(CST, #5174, 1:1,000 dilution), anti-p-AMPK (CST, #2535, 1:1,000 dilution), and anti-AMPK (CST, #2532, 1:1000 dilution) primary antibodies in dilution buffer. The cells were incubated with the horseradish peroxidase (HRP)-conjugated anti-rabbit IgG (Beyotime Biotechnology, A0216, 1:1,000 dilution). The membranes were developed using the enhanced chemiluminescence substrate LumiGLO (Millipore, Bedford, MA, USA).
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