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106 protocols using ab76956

1

Protein Expression Analysis of Dental Tissues

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The drilled tooth was prepared with RIPA cell lysis buffer, the supernatants were collected, and the total protein by the BCA kit (Thermo Scientific, Rockford, IL, United States of America) was measured. It was added 20 μg total protein per line to separate by sodium dodecyl sulfate-polyacrylamide gel (SDS-PAGE). Then, proteins were transferred onto polyvinylidene difluoride (PVDF) membranes. PVDF membranes were blocked in TBS-T at room temperature for 2 h and washed three times. Next, they were incubated with primary antibodies at 4 °C overnight.
Primary antibodies included that BMP-2 (1:1,000, ab225898, Abcam), osteocalcin (1:2,000, ab76956, Abcam), osterix (1:1,000, ab209484, Abcam), and Runx2 (1:500, ab76956, Abcam), Wnt3a (1:1,000, ab219412, Abcam), p-GSK3β (1:1,000, #5558, CST), GSK3β (1:1,000, #12456, CST), p-β-catenin (1:1,000, #2009, CST), β-catenin (1:1,000, #8480, CST) and GAPDH (1:5,000; #5174, CST). Then, membranes were incubated with goat anti-mouse IgG (H+L) HRP (1:5,000, ab6789, Abcam) and goat anti-rabbit IgG (H+L) HRP (1:5,000, s0001, Affinity) secondary antibodies for 2 h at room temperature and washed three times. PVDF membranes were detected with ECL, and the protein bands were quantified by Scion Image 4.0 software (Scion Corporation, Frederick, MD, United States of America).
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2

Protein Expression Analysis of Stem Cell Markers

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Total protein was extracted from cells and tissues with SDS lysis buffer (Beyotime), with the concentration measured utilizing a bicinchoninic acid kit (20201ES76, YEASEN Biotechnology Co., Ltd., Shanghai, China). After separation using 8% sodium dodecyl sulfate polyacrylamide gel electrophoresis, the sample was submitted to electrotransfer onto polyvinylidene fluoride membranes (Millipore, Billerica, MA, USA) which were blocked using 5% blocking solution with skimmed milk powder and underwent overnight incubation at 4°C with primary rabbit antibodies against CGRP (ab189786, 1 : 1000, Abcam), RUNX2 (ab76956, 1 : 1000, Abcam), OCN (ab93876, 1 : 500, Abcam), ALP (ab229126, 1 : 1000, Abcam), CD45 (ab40763, 1 : 5000, Abcam), CD73 (ab133582, 1 : 5000, Abcam), and CD90 (ab92574, 1 : 1000, Abcam) as well as 1 h-incubation with horseradish peroxidase-labeled secondary antibody goat anti-rabbit IgG (ab150077, 1: 1000, Abcam) at ambient temperature. The immunocomplexes on the membrane were visualized utilizing enhanced chemiluminescence (ECL) reagent (ECL808-25, Biomiga, USA) at ambient temperature for 1 min, and band intensities were quantified with the help of Image Pro Plus 6.0 software (Media Cybernetics, Silver Springs, MD, USA).
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3

Western Blot Analysis of RUNX2 Protein Expression

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Total proteins were obtained using an EpiQuik Total Histone Extraction Kit (Epigentek, Farmingdale, NY, U.S.A.; cat. no. OP-0006-100) according to instructions provided with the kit. Protein concentrations were determined using a Bradford Protein Assay Kit (Solarbio, Beijing, China; cat. no. PC0010). Aliquots of total protein from each sample were separated by 10% SDS-PAGE, and the protein bands were transferred onto PVDF membranes (Millipore, Burlington, MA, U.S.A.). The membranes were then blocked with 5% low fat dried milk for 2 h at room temperature and subsequently incubated with primary antibodies against RUNX2 (1:500, mouse, Abcam, Cambridge, U.K.; ab76956) and β-actin (1:3000, mouse, Abcam; ab20272) overnight at 4°C. After washing, the membranes were treated with Goat Anti-Mouse IgG (HRP, 1:5000, Abcam; ab205719) for 2 h at room temperature. The results were examined using enhanced chemiluminescent reagents.
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4

Smad Signaling in Osteo-/Odonto-genesis

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Following 12-hr serum starvation, hBMSCs were cultured in osteo-/odonto-genesis induction medium (OIM) with or without 0.1, 1, 10 and 50 ng/mL rhTGFβ1, pH7.4 or pH10 dentin extracts, 700 ng/mL Noggin (R&D Systems) or 10 μM SB431542 (Selleckchem). After 30-min or 7-day culture, cells were washed with ice-cold PBS followed by protein extraction in RIPA Lysis Buffer (Thermo Scientific) with Protease/Phosphatase Inhibitor Cocktails (Cell Signaling Technology). Proteins were separated on a NuPAGE® Novex® 4–12% Bis-Tris Protein Gel (1.0 mm), transferred to nitrocellulose membrane (Bio-Rad), and detected with anti-phospho-Smad 2/3 (ab52903, 1:500, Abcam), anti-Smad 2/3 (ab202445, 1:500, Abcam), anti-Smad 1/5/9 (ab66737, 1:500, Abcam), anti-phospho Smad 1/5/8 (ab3848, 1:500, Millipore), anti-COL-1 (ab34710, 1:500, Abcam), anti-DSPP (sc-73632, 1:200, Santa Cruz Biotechnology), anti-RUNX2 (ab76956, 1:500, Abcam), anti-GAPDH (sc-25778, 1:200, Santa Cruz Biotechnology) antibodies. Images were developed with IR fluorescence & Odyssey using corresponding secondary antibodies (LI-COR).
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5

Immunohistochemical Analysis of TMJ Tissues

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Paraffin-embedded heads were sectioned at a thickness of 8 µm for immunohistochemistry. Subsequent to blocking with goat serum (1:10; Invitrogen Life Technologies, Carlsbad, CA, USA) and incubation for 15 min at room temperature, the sections were incubated with polyclonal antibodies against runt-related transcription factor 2 (Runx2; 1:1,000; ab76956), sex determining region Y-box 9 (Sox9; 1:500; ab26414), collagen type I (col I) (1:500; ab34710), collagen type II (col II) (1:200; ab53047), aggrecan (1:500; ab36861), matrix metalloproteinase 9 (MMP9) (1:300; ab38898), MMP13 (1:50; ab75606) and Ihh (1:200; ab39634) from Abcam (Cambridge, MA, USA) overnight at 4°C. The slides were then washed three times with PBS and were incubated with a biotinylated horseradish peroxidase goat anti-rabbit secondary antibody (1:1,000 dilution; Invitrogen Life Technologies) for 20 min at 37°C. The slides were then washed three times with the secondary antibody using PBS. Immunolabelling was visualized with 0.05% diaminobenzidine (Invitrogen Life Technologies) in PBS for 5 min at room temperature, and the slides were then rinsed for 10 min under running tap water. The TMJ immunohistochemical staining was analyzed under the Olympus BH-2 light microscope.
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6

Protein Expression Analysis of Osteogenic Markers

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Samples were processed with a lysis buffer for 30 min after being washed twice with ice-cold PBS. At 4 °C, the lysates were centrifuged for 15 min at 12,000× g. Gel separation (Mini-PROTEAN® TGX™ Precast Gels; Bio-Rad, Hercules, CA, USA), transblotting to membranes (Immun-Blot®; Bio-Rad), and immunoblotting with the appropriate antibodies and detection kits were all used to separate the samples.
Primary antibodies against Runt-related transcription factor 2 (RUNX2, ab76956; Abcam, MA, USA), collagen I (ab6308; Abcam), and glyceraldehyde 3-phosphate dehydrogenase (GAPDH, ab9485; Abcam) were used for the analysis and secondary antibodies were purchased from Abcam. Using an image processing tool (ImageJ, National Institutes of Health, Bethesda, MD, USA), the protein expressions of RUNX2, collagen I, and GAPDH were quantitatively evaluated.
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7

Immunohistochemical Analysis of Cathepsin K and RUNX2

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We used a routine method to rehydrate the slides prepared as described above and blocked non-specific binding by addition of hydrogen peroxide. The slides were then incubated with anti-Cathepsin K antibody (catalogue no. ab19027; Abcam, Cambridge, MA, USA) and anti-RUNX2 antibody (ab76956, Abcam) at 4 °C overnight followed by incubation with HRP-conjugated goat anti-rabbit IgG antibody (DAKO Inc., Denmark) at room temperature for 30 min. The slides were counterstained with haematoxylin at room temperature for 6 min, covered with neutral resin, and observed under a microscope (BX53, Olympus). The images were photographed and analyzed using CellSens Dimension software (version 510-UMA-CellSens19.0-krishnach-00-01). The integrated optical densities (IOD) were semiquantitatively analyzed with the aid of Imaging Pro Plus 6.0 software (Media Cybernetics, Rockville, MD, USA).
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8

Western Blot Analysis of Osteogenic Markers

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Cell extracts were prepared using Mammalian Protein Extraction Reagent (M-PER; Thermo Fisher Scientific) with complete protease inhibitor cocktail (Thermo Fisher Scientific) according to the manufacturer's instructions. Western blotting was performed by standard methods with anti-phospho p42/p44 MAPK (ERK1/2) (Thr202/Tyr204) (Cell Signaling Technology Inc., Danvers, MA), anti-total ERK1/2, anti-Runx2 (1:1000, ab76956, Abcam, Cambridge, MA), anti-Osterix (SP7) (1:1000, ab22552, Abcam), and anti-β-actin (1:1000, A5441, Sigma-Aldrich) antibodies.
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9

Osteogenic Lineage Protein Expression

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Whole cell lysates were prepared from early passage PDL and AB progenitors by using 1X RIPA buffer containing protease inhibitors (Roche, Indianapolis, IN, USA). Here 50 µg of total protein was subjected to SDS-polyacrylamide gel electrophoresis and transferred to a PVDF membrane (EMD Millipore, Billerica, MD, USA). After blocking for nonspecific binding, the membranes were incubated with antibodies against RUNX2 (ab76956), OSX (ab22552), IBSP (ab33022) and β-ACTIN (ab3280) (antibodies were from Abcam and used at a dilution of 1:1000). Immune complexes were detected using goat antimouse or goat antirabbit HRP conjugated secondary antibody (Santa Cruz Biotechnology, Dallas, TX, USA) and enhanced Chemiluminescence reagents (Pierce Biotechnology, Rockford, IL, USA).
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10

Immunofluorescent Assay of Runx2 and Collagen I

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An immunofluorescent assay was performed for Runt-related transcription factor 2 (Runx2) (ab76956; Abcam, Cambridge, UK) and collagen I (ab6308; Abcam) on days 1, 3, 5 and 7. The cells were fixed, permeabilized, blocked, and incubated with primary antibodies. Mouse monoclonal Runx2 antibody was diluted at 1:50 and was incubated overnight incubation at 4°C. Mouse monoclonal collagen I antibody was diluted at 1:67 and was incubated overnight incubation at 4°C. The cultures were incubated with fluorescein isothiocyanate-conjugated secondary antibody (F2761; Thermo Fisher Scientific, Inc., Waltham, MA, USA) diluted at 1:100 and incubated for 2 h at room temperature. The washed cells were stained with 4′,6-diamidino-2-phenylindole (DAPI). Analyses were performed using a fluorescence microscope (Axiovert 200; Zeiss GmbH, Jena, Germany).
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