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43 protocols using ab283654

1

Immunohistochemical Staining of Immune Markers

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Immunohistochemical (IHC) staining was conducted following standard procedures, which included fixation, deparaffinisation, hydration, antigen retrieval, blocking and incubation with primary antibodies (4°C overnight) and biotinylated secondary antibodies. The experiment utilised the following primary antibodies: anti‐CD68 (Abcam, ab283654), anti‐ABCA1 (Abcam, ab18180) and anti‐CD163 (Abcam, ab182422). IHC staining was evaluated as previously reported.
9 (link)
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2

Wound Regeneration and Immune Cell Profiling

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The samples were fixed with 4% paraformaldehyde at least 48 hours before ethanol and xylene dehydration. H&E staining and Masson’s trichrome staining were performed for the observation of re-epithelialization and collagen fiber deposition. Immunofluorescence staining for cytokeratin 5 (ab52635, Abcam, 1:200), cytokeratin 10 (ab76318, Abcam, 1:150), cytokeratin 17 (17516-1-AP, Proteintech, 1:200), TWIST2 (66544-1-Ig, Proteintech, 1:100), Ki67 (Servicebio, GB121141, 1:100), SCD1 (28678-1-AP, Proteintech, 1:200), CRABP1 (13163 S, Cell Signaling, 1:100), MEST (11118-1-AP, Proteintech, 1:100) were performed for to assess wound regeneration. For the evaluation the infiltration of immune cells, immunohistochemistry staining for CD3 (14-0032-82, Thermo Fisher Scientific, 1:100), CD68 (ab283654, Abcam, 1:100), Ly6G (ab238132, Abcam, 1:2000) and immunofluorescent staining for F4/80 (29414-1-AP, Proteintech, 1:200), CD206 (360017, Zenbio, 1:100), FOXP3 (sc-53876, Santa Cruz Biotechnology, 1:100), were performed.
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3

Immunofluorescence Staining of Aortic Tissue

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For serial cryo-sectioning, the aorta was dissected and embedded in an optimal cutting temperature compound (Beyotime, China). IF staining was performed according to a previously described method.15 (link) Briefly, the tissue sections or cell samples were fixed with acetone and then blocked with 1% bovine serum in PBS for 1 h. Primary antibodies, including anti-elastin (1:500, ab217356, Abcam, UK), anti-CD68 (1:500, ab283654, Abcam, UK), anti-α-SMA (1:500, ab124964, Abcam, UK), and anti-SM22α (1:500, ab10135, Abcam, UK), were diluted in primary antibody dilution buffer and incubated with samples at 4°C overnight. The samples were then incubated with fluorescent secondary antibody at 37°C for 2 h. Images were photographed under a fluorescence inverted microscope (Lecia, Germany).
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4

Quantifying Immune Cell Markers

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The paraffin-embedded sections were incubated with primary antibodies for CD68 (1:50 dilution, ab283654, Abcam, Cambridge, United Kingdom), iNOS (1:200 dilution, ab178945, Abcam, Cambridge, United Kingdom), and CD206 (1:1000 dilution, ab64693, Abcam, Cambridge, United Kingdom) overnight at 4°C, followed by treatment with appropriate secondary antibodies (1:400 dilution) and counterstaining with DAPI. The labeled cells were examined under fluorescence microscopy.
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5

Cardiac Tissue Histochemistry and Immunofluorescence

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Heart tissue was fixed in 4% POM for >24 h. Part of the heart tissue was paraffin-embedded, while the other part was OCT-embedded. Masson’s trichrome and hematoxylin and eosin (H&E) staining were performed on paraffin sections (4 μm). The OCT sections (8 μm) were treated with wheat germ agglutinin (WGA). Cardiac sections were stained with anti-α-SMA (ab124964, Abcam) by immunohistochemistry at 4°C overnight. The next day, after washing with PBS, the sections were incubated with the secondary antibody and DAB substrate. The color reaction was stopped with ddH2O, and the sections were incubated with hematoxylin. Frozen sections or cells were fixed with 4% POM for 15 min at room temperature and then incubated with anti-CD68 (ab283654, Abcam), anti-CD206 (ab300621, Abcam), or anti-iNOS (ab283655, Abcam) at 4°C overnight. The next day, after washing with PBS, the sections were incubated with fluorescently labeled antibodies at room temperature for 30 min and then with DAPI at room temperature for 3 min. Pictures of the sections were taken at ×100/×200 magnification on a fluorescence microscope (Olympus, BX53, Japan).
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6

Immunohistochemical Analysis of Kidney Tissue

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Immunohistochemical staining of the paraffin-embedded tissues was performed as follows: Following deparaffinization and antigen retrieval, the kidney tissue sections were blocked with 10% goat serum for 1 h and then incubated overnight at 4°C with the following antibodies: Anti-CD68 antibody (1:100, cat. no. ab283654; Abcam) and anti-lymphocyte antigen 6 complex, locus G (Ly-6G) (1:200, ab25377; Abcam). The following day, following incubation with HRP-conjugated secondary antibodies (1:500, cat. no. ab97057; Abcam; 1:500, cat. no. 7074, Cell Signaling Technology, Inc.) for 1 h at room temperature, the slides were developed with DAB until the signal clearly appeared, and the nuclei were stained with hematoxylin for 5 min at room temperature, and images were obtained using a microscope (Olympus IX83, Olympus Corporation).
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7

Immunohistochemical and Immunofluorescent Staining

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Sections were de-paraffinized and hydrated. Antigen retrieval was performed in a decloaking chamber (Biocare Medical, Pacheco, CA, USA) using citrate buffer pH 6.0. Endogenous peroxidases and non-specific binding sites were blocked with Bloxall (Vector Laboratories, Burlingame, CA, USA), rodent block (Biocare Medical) and horse serum (10%). Primary antibodies anti-NR2F6/Ear2 (ab137496, Abcam, Waltham, MA, USA, 1:3000 dilution), anti-GPNMB (ab188222, Abcam, Waltham, MA, USA, 1:1000 dilution) were added overnight. An HRP-conjugated horse anti-rabbit IgG Polymer (Vector Laboratories) was used as secondary for 30 min and the signal was developed using the SignalStain DAB Substrate Kit (Cell Signaling). For IF, anti-CD68 (ab283654, Abcam, Waltham, MA, USA, 1:1000 dilution) and anti-CD72 (AF1279, R&D Systems, Minneapolis, MN, USA, 1:40 dilution) antibodies were coadministered overnight and were labeled with horse anti-rabbit or anti-goat Dylight 488 and 594 (Vector Laboratories, 1:300 dilution) secondary antibodies for 30 min. Alternatively, an Opal kit (Akoya Biosciences, Marlborough, MA, USA) was used with anti-NR2F6/Ear2 (ab137496, Abcam, Waltham, MA, USA, 1:700 dilution) and anti-CD206/Mrc1 (24595T, Cell Signaling, Danvers, MA, USA, 1:500 dilution) primary antibodies.
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8

Immunohistochemical Analysis of Biomarkers

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After dewaxing in xylene and rehydration in graded alcohols, the tissue sections were boiled in citrate buffer, pre-incubated with H2O2, and then blocked with rabbit or goat serum (DAKO, Denmark). Subsequently, the sections were incubated with a primary antibody and then with an HRP-conjugated secondary antibody. The proteins of interest were visualized by using diaminobenzidine before counterstaining with hematoxylin. The primary antibodies used were as following: MIF (ab7207, Abcam, USA), CD68 (ab283654, Abcam, USA) and HIF-α (ab51608, Abcam, USA).
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9

Histological Analysis of Tendon Adhesion

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After the surgery, the hind limbs were fixed with 4% paraformaldehyde for 1 day after perfusion, followed by decalcification in 10% EDTA with shaking for 4 weeks. The fixed tissue was dehydrated in graded ethanol, embedded in paraffin, and then sliced into 5 μm sections with a microtome (Leica RM2235, Germany). The sections were subjected to hematoxylin & eosin (H&E) staining, Masson’s staining, and immunohistochemical staining of Collagen III (1:300 dilution, sc-271249, Santa Cruz, USA) and IL-1β (1:400 dilution, ab283818, Abcam, UK). The degree of adhesion of the injured tendon was assessed using a 1–5 grade histological scoring system [4 (link)]. The sections were also subjected to immunofluorescence assay with rat anti-CD68 antibody (1:200 dilution, ab283654, Abcam, UK), anti-iNOS (1:200 dilution, ab178945, Abcam, UK), and anti-CD206 (1:200 dilution, ab64693, Abcam, UK). All stained sections were visualized using a fluorescence microscope (BX43, Olympus, Japan). Images were analyzed by the public domain software ImageJ 1.53.
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10

Immunohistochemical Analysis of CAP2 Expression

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Immunohistochemical (IHC) experiments were conducted with an SP9000 IHC kit according to the manufacturer’s instructions (ZSGB Bio). GC tissues were treated with anti-CAP2 (1:150; 15865-1-AP, Proteintech), anti-CD163 (1:200; ab182422, Abcam), anti-iNOS (1:200; ab283655, Abcam), and anti-CD68 (1:200; ab283654, Abcam) at 4°C for 12 hours. The IHC staining intensity was scored as follows: 0, negative staining; 1, light brown; 2, brown; and 3, dark brown. The stained area was scored as follows: 0, less than 5%; 1, 5%–25%; 2, 26%–50%; 3, 51%–75%; and 4, 76%–100%. The product of intensity and percentage was considered the final score. ROC curve analysis was used to obtain the cutoff values. A final score greater than 7 was defined as high expression of CAP2.
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