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4 protocols using appropriate fluorescence conjugated secondary antibodies

1

Immunohistochemical Analysis of Microglia

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Tissues were embedded in Optimal Cutting Temperature Compound (OCT, Fisher Scientific) and then sectioned into 10 μm slices. Sections were stained with OX-42 (1:1000, Abcam), mannose receptor (CD206) (1:500, Abcam), GFAP (1:1000, Abcam), and NeuN (1:1000, Abcam) at 4°C overnight. Appropriate fluorescence conjugated secondary antibodies (Jackson Immunoresearch, West Grove, PA) were incubated for 1 h at room temperature. Leica DMi8 (Leica Microsystems, Germany) was used to image the peri-ventricular region. M2 microglia activated cells were counted on 6 sections in every group over a 20 × microscopic field and measured as cells/field, as described 31 (link).
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2

Dual Immunofluorescence Staining of NTN-1 and NeuN

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Double fluorescence staining was performed as described previously (Huang et al., 2015 (link)). Frozen coronal sections (10 μm) were blocked with 5% donkey serum for 1 h and incubated at 4°C overnight with primary antibodies: rabbit anti-NTN-1 (1:500, Abcam), and mouse anti-NeuN (1:500, Abcam) followed by incubation with appropriate fluorescence-conjugated secondary antibodies (Jackson ImmunoResearch, West Grove, PA) for 2 h at room temperature. Negative control staining was conducted by omitting the primary antibody. Finally, slides were covered with DAPI (Vector Laboratories, Inc.). The sections were visualized under a fluorescence microscope Leica DMi8. Microphotographs were analyzed with LASX software.
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3

Microglial response in intracerebral hemorrhage

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10 µm thick slices were first stained with OX-42 (1:1000, ABcam) and mannose receptor (1:1000, ABcam) overnight at 4 °C, followed by incubation with appropriate fluorescence conjugated secondary antibodies (Jackson Immunoresearch, West Grove, PA). The peri-hemorrhagic area was imaged by a Fluorescent Olympus-BX51 microscope and analyzed using MagnaFire SP 2.1B software (Olympus, Melville, NY). At least six sections per animal group over a microscopic field of 20 × (for microglia) were averaged and expressed as cells/field, as described (Wang and Dore, 2007 (link))
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4

Immunofluorescence Analysis of Cerebral Ischemia

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At 24 hours following ICH, mice were perfused under deep anesthesia with cold phosphate-buffered saline (PBS, pH 7.4), then infused with 10% formalin. Brains were removed and fixed in formalin at 4°C for a minimum of 3 days. Samples were dehydrated with 30% sucrose in phosphate-buffered saline (PBS, pH 7.4) and the frozen coronal slices (10 μm thick) were sectioned in cryostat (CM3050S; Leica Microsystems). Immunofluorescence was performed as previously described.22 (link),36 (link) Anti-PDGFR-β antibody (1:100, Santa Cruz), anti-p-p38 MAPK (1:100, Santa Cruz), anti-p-MK2 (1:100, Santa Cruz) anti-ICAM-1(1:100, Santa Cruz), anti-SMemb (1:100, abcam) were incubated separately with primary antibodies: anti-smooth muscle actin (1:1000, Santa Cruz) overnight at 4°C. It was then incubated with the appropriate fluorescence conjugated secondary antibodies (Jackson Immunoresearch, West Grove, PA). The slices were observed underneath a fluorescence microscope (Olympus BX51, Olympus Optical Co. Ltd, Japan), and pictures were taken with software MagnaFire SP 2.1B (Olympus, Melville, NY).
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