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4 protocols using rodent decloaker solution

1

Muscle Fiber Characterization via Histochemistry

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Formalin-fixed muscles were bisected and paraffin-embedded, and 10-μm cross sections were taken at the midbelly region. Sections were deparaffinized, rehydrated and subjected to Masson’s trichrome stain. In regard to immunohistochemitry, deparaffinized and rehydrated10-μm cross sections were subjected to antigen retrieval by heating in Rodent Decloaker solution (BioCare Medical, Pacheco, CA) at 80 °C for 30 min. Sections were blocked in 5% goat serum in PBS and incubated in rabbit anti-laminin (Sigma) diluted in 1:100 in blocking solution. Sections were then incubated in goat anti-rabbit secondary antibody conjugated to Alexa 488 (Life Technologies) diluted 1:200 in blocking solution. For detection of type II fibers sections were further incubated in anti-fast (type II) MHC conjugated to alkaline phosphatase (Sigma, St. Louis, MO) diluted 1:50 in PBS for 60 min at room temperature. Whole stained sections were scanned on an Olympus VS120 fluorescent slide scanner.
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2

Quantitative Neutrophil Staining in Whole Footpads

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Whole footpads were harvested and fixed in 10% neutral buffered formalin for ≥24 hr. Tissue was decalcified using formic acid and paraffin embedded. Sections (5 μm thick) were de-paraffinized and rehydrated, and antigen retrieval was performed using Rodent Decloaker solution (Biocare Medical) at 80°C for 3 hr. Sections were stained with H&E, blocked with Rodent M Block (Biocare Medical), and labeled with anti-Ly-6G (clone 1A8-Ly6g, eBioscience).
Endogenous peroxidases were quenched with 3% H2O2, and antibody labeling was detected using horseradish peroxidase (HRP)-conjugated reagents and then visualized with diaminobenzidine chromogen (DakoCytomation). Quantitation of neutrophil staining was done using ImageJ software to integrate the total Ly-6G staining intensity in microscopic images (2× magnification) of whole-footpad sections.
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Immunohistostaining of Mouse Tissues

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Mouse tissue processing and immunohistostaining were performed by the Pathology Core Laboratory at Tulane University Health Sciences Center (http://medicine.tulane.edu/departments/pathologylaboratorymedicine/research/histology-laboratory) as described previously.19 (link), 20 (link) Heat-induced epitope retrieval was performed on tissue sections by using Rodent Decloaker solution (BioCare Medical, Concord, CA; RD913) and cooked in an oster steamer for 40 minutes. Sections were blocked by using Rodent Block M (BioCare Medical; RBM961), followed by incubation with the following antibodies: ADAMTS12 (Abcam; cat 203012, lot GR2390174), ITGA2 (Abcam; cat 133557, lot GR19622312), ST8SIA5 (Abcam; cat 184777, lot GR2231323), and Ki67 (1:100, 45 minutes; BioCare Medical; CRM325). After washing, tissue sections were incubated with Rabbit-on-Rodent HRP-Polymer secondary (BioCare Medical; RMR622); sections were then washed and treated with Betazoid DAB chromogen (Biocare Medical; BDB2004), followed by counterstaining with Cat hematoxylin (Biocare Medical; CATHEM). Slides were dried in the oven, placed in xylene, and coverslipped (Acrymount; StatLab, McKinney, TX; SL804). Images were obtained by using the slide scanner Aperio CS2 (Leica, Wetzlar, Germany) and Image Scope software.
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4

Quantifying Kidney Tissue Injury and Angiogenesis

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Kidney sections in 7-μm thickness were deparaffmized [25 (link)], heated in Rodent Decloaker solution (Biocare Medical) for 30 min to retrieve antigens, and blocked with 1% BSA and 0.1% Triton-100 in PBS for 1 h. Tissue sections were incubated with FITC- or Alexa Fluor 594-labeled anti-CD31 mAb (Biolegend) at 4oC overnight. Nuclei were stained with DAPI. Tissue sections were analyzed under an AxioImager fluorescence microscope (Carl Zeiss). Furthermore, tissue sections were stained with hematoxylin and eosin (H&E) for structural examination using a light microscope.
Tubular injury was evaluated in each viewing field. Tubular injury was defined as tubular dilatation, tubular atrophy and vacuolization. Briefly, only cortical tubules were quantified with the following scoring system: 0 = no tubular injury; 1 = <10% of tubules injured; 2 = 10–25% of tubules injured; 3 = 26–50% of tubules injured; 4 = 51–75% of tubules injured; 5 = >75% of tubules injured [26 (link)]. The size of individual glomeruli was calculated as the average of the largest and smallest glomerular diameters within viewing fields [27 (link)]. Vessel density was quantified using Photoshop [13 (link)].
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