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4 protocols using ab75285

1

Western Blot Protein Expression Analysis

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The cells were lysed with immunoprecipitation assay buffer containing protease inhibitors. The protein concentrations were examined using the BCA Protein Assay kit (Vazyme Biotech, China).40 μg of proteins were separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and transferred onto a piece of polyvinylidene diluoride membrane. The membranes were blocked with 5% non-fat milk in TBST (Tris-buffered saline with 0.5% of Triton X-100) for 1 hour at room temperature, and then incubated with the appropriate primary antibody against Col1a1 (No.ab21286 Abcam)and OPN (No. ab75285 Abcam) or GAPDH (No. 10494-1-AP Proteintech, China) overnight at 4°C. The membranes were washed 3 times in TBST, followed by incubation with the appropriate horseradish peroxidase-linked secondary antibodies (No. 10285-1-AP Proteintech, China) for 1 hour at room temperature. The specific proteins on the blots were developed with enhanced chemiluminescence (Vazyme Biotech, China) and visualized as the bands on the CL-XPosure Film (Thermo Fisher Scientific).
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2

Protein Expression Analysis of Osteogenic Markers

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Total proteins were extracted, and protein concentrations were quantified using the BCA Protein Assay Kit. The membrane was blocked and incubated with rabbit anti-Runx2 (1:1000, ab192256, Abcam), anti-OCN (1:1000, ab13420, Abcam), anti-OPN (1:1000, ab75285, Abcam) primary antibody, anti-NOTCH1 (1: 1000, ab8925, Abcam) and anti-GAPDH (1:10,000, ab181602, Abcam) at 4 °C overnight. Then a horseradish peroxidase-conjugated secondary antibody was added. Western blot analysis was performed according to the references (Welinder and Ekblad 2011 (link)). The western blot experiments were performed in three replicates.
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3

Western Blot Analysis of Bone Marrow Stromal Cell Proteins

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Whole-cell lysates were prepared from the BMSCs. Cells were lysed using mammalian protein extraction reagent (Pierce Chemical, Dallas, TX), containing protease inhibitor mixture (Roche Applied Science, Indianapolis, IN). The whole-cell lysates (10 μg protein/lane) were loaded and separated in 10% sodium dodecyl sulfate-polyacrylamide gel electropheresis (SDS-PAGE) gels, electro-blotted into a nitrocellulose membrane, and immune-blotted with anti-rabbit antibodies (Abcam, Cambridge, UK) to GAPDH (ab181602, 1:10,000), KLF2 (ab139699, 1:1000), runt-related transcription factor 2 (Runx2, ab23981, 1:1000), osteocalcin (OCN, ab93876, 1:500), osteopontin (OPN, ab75285, 1:1000), WWP1 (ab43791, 1:1000), CD63 (ab134045, 1:1000), CD81 (ab109201, 1:1000), Calnexin (ab92573, 1:20,000), TSG101 (ab125011, 1:1000), p65 (ab32536, 1:1000), phosphorylated p65 (ab86299, 1:2000), IκBα (ab32518, 1:1000), and phosphorylated IκBα (ab133462, 1:10,000). The electrogenerated chemiluminescence (Amersham Biosciences, Piscataway, NJ, USA) was employed to visualize these bands.
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4

Localization of Opsin Proteins in Human Skin

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Female human skin was obtained with full written consent adhering to the Declaration of Helsinki principles and under human tissue act guidelines. Facelift or abdominoplasty procedures were always performed in the morning and skin processed in the afternoon of the same day. Seven micrometer cryosections (n ¼ 4 donors, 44-63 years) were fixed in acetone before blocking with 5% bovine serum albumin (BSA) and 5% donkey serum (DKS) in phosphate-buffered saline (PBS) for 1 hour. Primary antibodies were diluted in 1% BSA and 1% DKS and incubated overnight at 48C; 1:200 OPN1-SW (AB5407, Millipore, Amsterdam-Zuidoost, the Netherlands), 1:100 OPN3 (ab66742 for immunohistochemistry (IHC) and ab75285 for immunocytochemistry (ICC), Abcam, Cambridge, UK), 1:200 OPN5 for IHC and 1:500 for ICC (ab199668, Abcam). A negative control (omission of primary antibody) was included in the experimental procedure. Double staining was performed with 1:200 KRT14 (ab51054 or ab7800, Abcam). Incubation with 1:200 Alexa-488 (ab150073, Abcam) and Alexa-647 (ab150115, Abcam) was for 1 hour at 378C. Slides were mounted using VECTASHIELD 1 containing DAPI (VECTOR). Images were taken using a confocal microscope (Leica Microsystems B.V., Amsterdam, the Netherlands).
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