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3 protocols using anti col6a1

1

Detailed Immunostaining Protocol for Tissue Analysis

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Immunostaining was performed as described previously (Liu et al., 2019b (link)). After antigen retrieval and blocking with serum for 1 h, the slices were incubated with the primary antibodies at 4°C overnight; these antibodies included anti-inhba (Santa Cruz, sc-166503), anti-wnt3a (Santa Cruz, sc-74537), anti-col6a1 (Santa Cruz, sc-377143), anti-wnt16 (Santa Cruz, sc-271897), anti-fgf18 (Santa Cruz, sc-393471), anti-chrm1 (Santa Cruz, sc-365966), anti-ngf (Abcam, ab52987), and anti-gdf7 (Abcam, ab189928). After washing three times with PBS, the slices were subjected to related secondary antibodies for 1 hour at room temperature. They were then washed three times with PBS (5 min each time), followed by incubation with diamidino-phenyl-indole (DAPI) for 30 min. Images were taken by laser scanning confocal fluorescence microscopy (Leica SP8).
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2

Synovial Cell Immunophenotyping

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Synovial cells were fixed with a Fixation and Permeabilization Solution (BD Biosciences, cat: #554722). Cells were then incubated with anti-VEGF-C (NOVUS NB110-61022) and anti-COL6A1 (Collagen type VI alpha 1 chain) antibody (Santa Cruz 377143), followed by APC-anti-rabbit IgG and PE-anti-mouse IgG antibody. Cells were subjected to flow cytometric analysis using a Becton-Dickinson FACSCanto II Cytometer, and analyzed with Flowjo10.4 software (FLOWJO, LLC Ashland).
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3

Western Blot Analysis of Protein Targets

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Fifty µg protein from each cell lysate were subjected to reducing SDS-polyacrylamide gel electrophoresis (SDS-PAGE) using 12 % resolving gels for 10-70 kDa proteins of interest or 10 % resolving gels for 20-100 kDa proteins of interest. SDS-PAGE was performed at 120 V at room temperature. Resolved proteins were subsequently transferred to nitrocellulose membranes (Bio-Rad, USA) at 80 V for 2 h at room temperature. The blot was blocked with 5 % (w/v) skimmed milk in 0.05% (v/v) Tween 20/Tris-buffered saline for 1h at room temperature, and probed with respective antibodies, followed by secondary antibodies dissolved in 5 % (w/v) skimmed milk. The blots were developed with either Novex ® ECL Chemiluminescent Substrate
Reagent Kit (Invitrogen) or Lumigen ® (GE Healthcare). All western blot analyses were conducted with at least three independent experiments. The antibodies used in our work were anti-POPX2 (self-raised), anti-CD81 (Santa Cruz), anti-CD9 (Santa Cruz), anti-HSP70 (Santa Cruz), anti-HSP90 (Santa Cruz), anti-COL6A1 (Santa Cruz), anti-LAMA5 (Santa Cruz), anti-
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