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22 protocols using srankl

1

Osteoclastogenesis from RAW264 and MSCs

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RAW264 cells were seeded in 24-well plates (Falcon) at 5 × 10 3 cells/well. On the following day (day 0), RANK Ligand, Soluble, Murine, Recombinant (sRANKL; Pepro Tech, Rocky Hill, CT, USA) was added to α-MEM (Sigma Aldrich) at 100 ng/mL. The medium was replaced with medium containing sRANKL every 2nd day. On day 8, TRAP staining was performed using a TRAP/ALP staining kit (Wako, Tokyo, Japan) to confirm differentiation into osteoclasts, and cells were observed with a DMi1 microscope (Leica, Wetzlar, Germany).
Next, MSCs were seeded into 6-well plates (Falcon) at 1 × 10 4 cells/well, and RAW264 cells were seeded at In other 6-well plates (Falcon), RAW264 cells were cultured alone at 5 × 10 3 cells/well. On the following day (day 0), the culture medium was replaced with medium containing sRANKL (Pepro Tech) (sRANKL was added to both RAW264 only cultures and RAW264/MSC co-cultures), and the medium was replaced with fresh medium every 2nd day.
From day 0 (at the start of sRANKL addition), using the number of actin ring-forming cells with five or more nuclei to represent the number of mature osteoclasts, osteoclast counts among RAW264 cells cultured alone and in RAW264 cell/MSC co-cultures were compared.
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2

Molecular Mechanisms of Osteoclastogenesis

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Human and murine M-CSF, sRANKL and TNF were purchased from Peprotech (Rocky Hill, NJ). I-BET was synthesized by GlaxoSmithKline (UK) as previously described15 (link),51 (link),52 (link). MYC inhibitor 10058-F4 was purchased from Sigma-Aldrich. The MTT assay kit was purchased from Roche, and cell viability was measured following the manufacturer’s instructions. The antibodies (1:1000) used for immunoblotting are as follows: NFATc1(BD Pharmagen; 556602); c-myc and p38 (Santa Cruz Biotechnology; sc-764 and sc535); Lamin B (Abcam; ab16048); phospho-ERK, IκBα, phospho-p38 and Blimp1 (Cell Signaling; 9101, 9242, 9215, 9115).
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3

Murine Osteoclastogenesis Assay

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Dulbecco’s modified eagle’s media (DMEM), minimum essential medium alpha medium (α-MEM), D-glucose, and Alizarin red S dye were supplied by Sigma-Aldrich Chemical (St. Louis, MO, USA), as were all other reagents, unless specifically stated otherwise. Fetal bovine serum (FBS), trypsin–EDTA, and penicillin–streptomycin were obtained from BioWhittaker (San Diego, CA, USA). 3-(4, 5-Dimetylthiazol-yl)-diphenyl tetrazolium bromide (MTT) was purchased from DUCHEFA Biochemie (Haarlem, Netherlands). The recombinant murine sRANKL was purchased from PeproTech (Rocky Hill, NJ, USA). Scopoletin (Sigma-Aldrich Chemical, St. Louis, MO, USA) was dissolved in dimethyl sulfoxide (DMSO) for live culture with cells; the final culture concentration of DMSO was <0.5%.
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4

Osteoclastogenesis Assay of RAW264.7 Cells

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Osteoclast differentiation of RAW264.7 co-cultured with MM CM was assessed after 6 days of culture conditions by the detection of TRAP activity, according to the procedure provided by the manufacturer (Acid-phosphatase leukocyte staining kit; Sigma–Aldrich, USA) and observed by optical microscopy. Mature OC are defined as multinucleated TRAP+ cells that contain more than 3 nuclei. As control, RAW264.7 cells were incubated with 100 ng/mL sRANKL (PeproTech, USA) and 25 ng/mL macrophage-colony stimulating factor (M-CSF) (PeproTech, USA).
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5

Osteoclast Differentiation and Resorption Assay

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BMCs were seeded on 96-well plates for osteoclast differentiation assay or osteo assay plates for resorption assay at a density of 1.0 × 105 cells per well and cultured in alpha-modified Eagle’s minimum essential medium (α-MEM) with 15% FBS containing 20 ng/mL M-CSF (#315–02; Peprotech, Rocky Hill, NJ, USA) and 50 ng/mL murine soluble recombinant receptor activation of nuclear factor kappa-B ligand (sRANKL, #315–11; Peprotech). After 2 days, BMCs were cultured in the presence of 20 ng/mL M-CSF and 50 ng/mL sRANKL with 10% FBS and 5% mouse serum for 3 days. Sera were prepared from each group of mice. In regard to the neutralization of C5a, 0.5 μg/mL anti-mouse C5a antibody (#MAB21501; R&D) or rat IgG2 isotype control (#MAB006; R&D) was added to the culture medium. After 3 days, differentiated osteoclasts were identified by TRAP staining and TRAP-positive multinucleated (more than three nuclei) cell numbers were evaluated. Resorption areas were measured by ImageJ after removal of the cells with 1 M NH4OH.
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6

Molecular Mechanisms of Osteoclastogenesis

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Human and murine M-CSF, sRANKL and TNF were purchased from Peprotech (Rocky Hill, NJ). I-BET was synthesized by GlaxoSmithKline (UK) as previously described15 (link),51 (link),52 (link). MYC inhibitor 10058-F4 was purchased from Sigma-Aldrich. The MTT assay kit was purchased from Roche, and cell viability was measured following the manufacturer’s instructions. The antibodies (1:1000) used for immunoblotting are as follows: NFATc1(BD Pharmagen; 556602); c-myc and p38 (Santa Cruz Biotechnology; sc-764 and sc535); Lamin B (Abcam; ab16048); phospho-ERK, IκBα, phospho-p38 and Blimp1 (Cell Signaling; 9101, 9242, 9215, 9115).
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7

Quantification of sRANKL and OPG

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sRANKL and OPG were quantified in cell conditioned media using the R&D System ELISA kits, MTR00 and MOP00 respectively, according to the manufacturer's instructions. Titration of free sRANKL was computed by the difference between equivalent weight of sRANKL and OPG obtained from ELISA, assuming 1:1 as reactive normality of sRANKL:OPG ratio.
Human recombinant sRANKL (Peprotech, cat # 310-01) was used for the in vitro osteoclastogenic assay.
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8

Osteoclast Differentiation from PBMCs

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PBMCs were isolated by density gradient centrifugation and plated in 96-well culture plates at a density of 7.0x105 cells/well and in 24-well culture plates at a density of 1.5x106 cells/well in Dulbecco's Modified Eagle Medium (DMEM; Invitrogen) supplemented with 5000 U Penicilin/Streptomicin (Invitrogen), 2 mM L-Glutamine (Invitrogen) and 10% Fetal Bovine Serum (FBS; Invitrogen) and incubated in a humidified atmosphere at 37°C, 5% CO2. PBMCs were left overnight for OC precursors (OCPs) to adhere on bone slices. On the following day (day 1 of culture) medium was changed to DMEM supplemented with M-CSF 25 ng/mL (Peprotech) and three days later, medium was again changed to DMEM supplemented with M-CSF (25 ng/mL), sRANKL (50 ng/mL; Peprotech), dexamethasone (10 nM; Sigma Aldrich) and TGF-β (2.5 ng/mL; R&D Systems) in order to differentiate the osteoclast precursors into mature osteoclasts. The culture medium was then changed twice a week. Adherent cells at day 1 and cells cultured on bone slices for 7, 14 and 21 days [13 (link)] were used for functional assays and gene expression.
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9

Osteoclastogenesis Assay with RAW 264.7

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Osteoclastogenesis assay using RAW 264.7 cells (ATCC, TIB-71) was performed using filtered (pore size = 0.2 μm) culture supernatant of PBL and human GMC. Briefly, RAW 264.7 cells (103 cells/well) were cultured with 50% supernatant in a 96-well plate. 100 ng/ml of sRANKL (Peprotech) or 10 ng/ml of TNF-α (Peprotech) were used as positive control. In some experiments, rabbit IgG anti-RANKL antibody, OPG-Fc (a kind gift from Dr. Colin Dunstan, Amgen Inc., Thousand Oaks CA), or goat IgG anti-TNF-α antibody (Peprotech) was applied. After cultivation, RNAs were extracted in some experiments to detect osteoclast differentiation marker gene transcripts by RT-PCR, or cells were stained for tartrate-resistant acid phosphatase (TRAP) using Acid Phosphatase kit (Sigma-Aldrich) according to the manufacturer’s instructions. Dark red multinucleated cells (over 3 nuclei) were counted as osteoclasts.
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10

Osteoclast Induction in Raw264.7 Cells

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Osteoclast induction of Raw264.7 cells was performed as described (Sun et al., 2016), with modifications. Briefly, Raw264.7 cells were seeded into 96‐well plates at a density of 1 × 104 cells/well, allowed to attach for 24 h, and then cultured in the presence or absence of recombinant murine sRANKL (100 ng/ml, PeproTech, USA) in combination with exosomes or miRNAs for 6 days. The medium was changed every 2 days, and after 6 days of culture, osteoclast differentiation was assessed by means of Trap staining and Trap‐activity detection (Beyotime).
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