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4 protocols using anti oc

1

Chondrocyte Protein Expression Profiling

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Eleven primary antibodies, including anti-OSX, anti-COL1A1, anti-OC, anti-MMP-1, anti-MMP-3, andanti-MMP-13, were purchased from Abcam (Cambridge, UK). After culturing for 48 h, the isolated chondrocytes were lysed in radioimmunoprecipitation assay (RIPA) lysis buffer. The total protein concentration was determined using a bicinchoninic acid (BCA) kit (Pierce, Rockford, IL, USA). Equal amounts of protein were isolated by sodium dodecyl sulfate - polyacrylamide gel electrophoresis (SDS-PAGE) and transferred to polyvinylidene difluoride membranes (Bio-Rad, Hercules, CA). The membranes were blocked with 5% skim milk in Tris-buffered saline Tween (TBST) for 1 h, and then incubated with primary antibody anti-OSX (1:1,000, ab22552, Abcam), anti-COL1A1 (1:1,000, ab34710, Abcam), anti-OC (1:500, ab93876, Abcam), anti-MMP-1 (1:1,000, ab137332, Abcam), anti-MMP-3 (1:500, ab53015, Abcam), and anti-MMP-13 (1:3,000, ab39012, Abcam) at 4 °C overnight. The membranes were then washed and subjected to goat anti-rabbit immunoglobulin (Ig)G horseradish peroxidase (HRP)-conjugated secondary antibodies. The blots were detected using an enhanced chemiluminescent (ECL) detection kit (Pierce, Rockford, IL, USA). Actin was used as a loading control. The band densities were determined and analyzed with an automatic digital gel image analysis system Bio-Rad CFX-96 (Bio-Rad, CA, USA).
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2

Protein Expression Analysis in Cell Culture

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After 3 days of culture, cells were lysed using Nonidet-P40 (NP40) buffer (Thermo), and a BCA protein assay kit was used to assess for the concentrations of the various proteins. Sodium dodecyl sulfate (SDS)–polyacrylamide gel electrophoresis was used to segregate the cell lysates (40 μg protein), which were then transferred onto polyvinylidene difluoride (PVDF) membranes (Merck Millipore, Burlington, MA, USA). These were placed in a solution containing 2% bovine serum albumin (BSA) and Tris-buffered saline with Tween 20 (TBST) for 1 h before they were exposed to primary anti-bone morphogenetic protein receptor type II (BMP2R), anti-phospho SMAD1/5/8, anti-phospho extracellular signal-regulated kinase 1/2 (p-ERK 1/2), anti-extracellular signal-regulated kinase 1/2 (ERK 1/2), anti-ALP, anti-OC, and β-actin (Abcam, Cambridge, MA, USA) for 2 h for further immunoblotting. Thereafter, horseradish peroxidase (HRP)-conjugated secondary antibodies were incubated with the samples for 1 h to enable chemiluminescence visualization. For this study, protein expression levels were normalized to β-actin. All experiments were performed in triplicate.
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Immunohistochemical Analysis of Bone Regeneration

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The central lateral sections of each group sample were probed with collagen type I, bone sialoprotein (BSP), osteocalcin (OC), and angiogenic marker CD31. Briefly, the samples were retrieved with 1 × citrate buffer (Sigma-Aldrich, St. Louis, MO) for 30 min at 95–100 °C. Followed which, all sets of groups were incubated with primary anti-BSP (1:500), anti-collagen type I (1:250), anti-OC (1:100), and anti-CD31 (1:50) antibodies (Abcam, Cambridge, UK) separately in a humidity chamber at 4 °C for overnight, and were subsequently marked with anti-biotinylated binding IgG secondary antibodies for at room temperature for 30 min. All immunohistochemical images were taken from a Nikon TE-2000 microscope, and three regions of each section were captured for semi-quantitative analysis using FIJI ImageJ (NIH). For BSP, collagen type I, and OC staining, percentage of positively stained tissue area to the whole tissue area were utilized on osteogenesis analysis. For CD 31 staining, the amount of blood vessels that formed on tissues were calculated for angiogenesis analysis47 (link),48 (link). All the other chemicals which were used in the characterizations were purchased from Vector Laboratories (CA, US).
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4

Immunohistochemical Analysis of Femoral Heads

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After decalcification and paraffin embedding, femoral heads were sectioned at a thickness of 5 µm in the coronal plane. Some of these sections were stained with hematoxylin and eosin (H&E) to evaluate the trabecular structure, while the others were deparaffinized, antigen retrieved, incubated with anti-OC (Abcam), anti-Runx2 (Abcam) and anti-VEGF (Boshide, Wuhan, China) primary antibodies and then incubated with the appropriate biotinylated secondary antibodies. Sections were colored with DAB and counterstained with hematoxylin. Photomicrographs were acquired using a LEICA DM 4000. Then, the images of immunohistochemical staining were analyzed with the software Image-Pro Plus, with which the integrated option density (IOD) of target protein and the total area of trabecular bones were measured, and the mean density (IOD/area) was calculated and counted.
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