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3 protocols using sc 7951

1

Comprehensive Protein Analysis Protocol

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Naproxen (>99% purity; TCI America, Oregon, USA), EDTA, EGTA, Sodium orthovanadate, Igepal CA-630, Triton X-100,) Complete Protease inhibitor tablet and PhosSTOP phosphate inhibit tablet (Sigma) were purchased. Primary antibodies against PCNA (ab-29), cyclin D1 (ab-134175), caspase-9 (ab-52298), and IL-10 (ab-133575) were purchased from Abcam (MA, USA). Antibodies against caspase-3 (cs-9662), p21 (cs-2947), PARP (cs-9542), actin (cs-4970), cre (cs-15036s), RalA (cs-4799s), PI3K (cs-4292s), and horseradish-peroxidase-conjugated secondary antibodies (anti-rabbit, -goat, and –mouse) were purchased from Cell Signaling Technology (Beverly, MA, USA). Primary antibody against p21 (sc-397), caspase-3 (sc-397; for immunohistochemistry [IHC]), and COX-2 (sc-7951) was purchased from Santa Cruz Biotechnology (Santa Cruz, CA, USA). Prostaglandin E2 ELISA kit (Cat. No. 514010) and mouse CXC-Chemokine receptor 4 (CXCR4) ELISA kit (Cat. No. MBS701736) were purchased from Cayman Chemical Company (Ann Arbor, MI) and MyBiosource.com (San Diego, USA). The Histostain-Plus 3rd Gen IHC Detection Kit (Life Technologies, NY, USA) and DeadEnd Colorimetric TUNEL system (Promega, Wisconsin, USA) were purchased.
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2

Chondrocyte Protein Expression Analysis

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HACs were lysed in radioimmunoprecipitation assay buffer (Invitrogen) supplemented with protease inhibitor cocktail (Sigma–Aldrich). After lysis, total proteins were separated in a NuPAGE Novex 4–12% Bis-Tris Gel (Invitrogen) and transferred to polyvinylidene difluoride nylon membranes (Sigma–Aldrich). The membranes were blocked with 5% nonfat dry milk in Tris-buffered saline and incubated overnight at 4 ​°C with primary antibodies against COX-2 (sc-7951; Santa Cruz Biotechnology, CA, USA), Col10a1 (bs0554 ​R; Bioss, MA, USA), PTHrP (TA334682; OriGene Technology, MD, USA) and GAPDH (MA5-15738; Thermo Scientific, MA, USA). Specific bands were detected with a horseradish peroxidase-conjugated secondary antibody and were read using an enhanced chemiluminescence western blot system from Pierce (Rockford, IL, USA).
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3

Quantification of Amyloid-Beta Peptides in Mouse Brain and Retina

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Western gels and enzyme-linked immunoabsorbent assay (ELISA) were performed for quantification of Aβ40 and Aβ42 peptides and total Aβ40 + Aβ42 peptide load in control and transgenic mouse brain and retina as previously described [18 (link)–20 (link),24 (link)–26 (link)]. Western immunoblots were performed using murine- and/or human-specific primary antibodies directed against Aβ40 or Aβ42 peptide (BDI350; ab20068 or ab10148; Abcam, Cambridge, MA, USA), the control protein marker β-actin (3598–100; Sigma-Aldrich Chemical Company, St. Louis, Missouri, USA), CRP (N-14; sc-18304), CRP (H-90; sc-30047) and/or CRP (C-13; sc-18306), COX-1 (AS70; sc-52757 and/or 41272; sc-70878), COX-2 (H3; sc-376861 and/or H-62; sc-7951; Santa Cruz Biotechnologies, CA, USA) using methods previously described by our group [18 (link)–27 ]. Both COX-2 and CRP levels were initially compared to an unchanging internal β-actin in the sample and then these values were used to derive COX-2 and CRP relative expression levels. Three different antibodies were used for CRP detection and COX-1 was used as the control for COX-2 as previously described [29 (link)].
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