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6 protocols using cd206 percp cy5

1

Immunostaining of Macrophage Subsets

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Tissue samples were embedded in optimal cutting temperature compound (OCT) and snap frozen in liquid nitrogen. Tissue sections (4 μm) were fixed in ethanol/acetic acid fixative solution for 2–10 min, and then were stained with anti-F4/80-PE (eBioscience), CD206-PerCP-Cy5.5 (Biolegend) overnight at 4°C in a humidified chamber. After three times of washes, slides were stained with DAPI and mounted with Prolong Gold mounting reagent (Invitrogen). Confocal imaging was performed using Leica SP5 II confocal microscope.
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2

Characterizing Melittin Binding to Immune Cells

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Rhodamine-conjugated melittin peptides were purchased from GenScript (Piscataway, NJ, USA). Splenocytes were seeded in a 6-well culture plate with 0.5 μg/ml of rhodamine-conjugated melittin. An hour later, cells were harvested and unbound peptides were washed off twice. Cells were stained with APC-conjugated antibodies for an hour at 4 °C to confirm the binding of melittin to CD4+ and CD8+ T cells and CD11b+ monocytes.
To verify whether the binding of melittin to CD11b+ cells is related to phagocytosis, splenocytes were pretreated with 10 nM cytochalasin D or vehicle (DMSO) for an hour in a 37 °C incubator. Next, the cells were incubated with the rhodamine-conjugated peptides and stained with CD11b-APC antibody as described above.
To observe the binding of melittin on CD11b+ subsets in splenocytes, macrophage, dendritic cells, and neutrophils were probed with anti-mouse F4/80-FITC, CD11c-APCcy7, and Gr1-PEcy7 (e-bioscience). Annexin-V was added to the samples prior to data acquisition to discriminate dead cells. M1 of M2 macrophages were stained with CD86-PEcy7 (e-bioscience) or CD206-PercpCy5.5 (Biolegend). Cells were detected on a FACSCalibur or FACSCantoII.
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3

Multiparametric Flow Cytometry Analysis

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Antibodies were obtained from BioLegend and used at a dilution of 1:200: CD45 BV605 (30‐F11), CD11b BV785 (M1/70), F4/80 PE‐Cy7 (BM8), SiglecF BV421 (S17007L), Ly6C APC‐Fire 750 (HK1·4), CD11c BV650 (N418), MHCII AF700 (M5/114·15·2), CD64 AF647 (X54‐5/7·1), MerTK FITC (2B10C42) and CD206 PerCP‐Cy5·5 (C068C2) for 30 min at 4°C. Ly6G BUV395 (1A8) and CD103 BUV805 (M290) were obtained from BD Bioscience. Dead cells were excluded using Fixable Viability Dye eFluor 506 (Thermo Fisher). Flow cytometry was performed using a Fortessa (BDBiosciences) and analysed using FlowJo V10.
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4

Tumor Immune Cell Profiling

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Tumors were harvested, weighed, and processed to obtain single-cell suspensions. In brief, tumor tissues were dissociated and digested with 250 µg/mL of Liberase (Roche) and incubated for 30 min at 37 °C, while shaking at 105 rpm for proper digestion. Fetal bovine serum was then added to stop the reaction, and samples were filtered and washed with PBS + 2% FBS. The cell count per sample was performed, then samples were stained using fluorochrome-conjugated antibodies from BioLegend including: CD45 Pacific blue, cat# 103126; CD4 BV605, cat# 100451; CD8 PE, cat# 100707; CD49b APC, cat# 108910; Foxp3 Alexa488, cat# 126406; TIGIT PE-Cy7, cat# 142108; Gr1 BV510, cat# 108437; CD11b APC-fire750, cat# 101262; F4/80 Alexa700, cat# 123130; CD206 PercpCy5.5, cat# 141716. In alternate panels, a set of other antibodies was also used including: CD4 FITC, cat# 100406; CD8 PErcpCy5.5, cat# 100734; Gr1 APC, cat# 108412; CD11c BV510, cat# 117337; and PVR (CD155) PE, cat# 132206. Samples were run on the Attune flow cytometer, and data were analyzed using Flow-Jo 10 software.
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5

Polarization of THP1 and Mouse Myeloid Cells

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THP1 cells were pretreated with 50 ng/mL PMA (Sigma) for 48 hours, then stimulated with macrophage M2 polarization inducers IL4 and IL13 (both at 40 ng/mL, Peprotech) for 48 hours. THP1 or whole blood cells from mice were resuspended in Stain Buffer (BD, 554656) for 15 minutes. The THP1 cells were stained with CD11b-APC (BD, 550019), CD64-FITC (BD, 555527), CD86-FITC (BD, 557343), and CD206-FITC (BD, 551135). The whole blood cells were stained with Ly6C-PE/Cy7 (BioLegend, 128017), Ly6G-APC (BioLegend, 127613), CD11b-FITC (BioLegend, 101205), CD86-PE (BioLegend, 105106), and CD206-PerCP/Cy5.5 (BioLegend, 141716). The cells were detected on a CytoFLEX (Beckman Coulter). The results were analyzed by FlowJo v10.0.
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6

Immune Cell Profiling in Irradiated Mice

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Female C57BL/6J mice aged 12 weeks were purchased from Charles River Laboratories (Saint-Germain-Nuelles, France). The mice were immobilised through anaesthesia (2% isoflurane) and locally irradiated at the thorax using a Varian Tube NDI 226 (X-ray machine; 250 Kev, tube current: 15 mA, beam filter: 0.2 mm Cu), with a dose rate of 1.08 Gy•min -1 . A single dose of 16 Gy was locally administered to the whole thorax.
Flow cytometry and fluorescence-activated cell sorting F4/80-FITC (eBioscience, Paris, France), Gr1-PE (eBioscience), CD11c-PE-Cy7 (Biolegend, Ozyme, Montigny-le-Bretonneux, France), and CD11b-APC-Cy7 (Biolegend) were used to identify neutrophils (Gr1 high (Ly6G + Ly6C -)), monocytes (Gr1 + (Ly6G -Ly6C + )), AMs (CD11c + CD11b -F4/80 + ) [14] and IMs (Gr1 -CD11b + CD11c -/+ F4/80 + ) [15] . Gr1 -mononuclear phagocytes (MPs) were identified as Gr1 - CD11b + CD11c + F4/80 -. Icam1-Pacific blue (Biolegend) was used to identify M1-polarised macrophages and CD206-PerCpCy5.5 (Biolegend), to identify M2-polarised macrophages. CD115-PE (eBioscience) was used to examine CSF1R expression in AMs and IMs. The samples were analysed using FlowJo 10.0.7 (FlowJo, Ashland, OR, USA). IMs and AMs were sorted using fluorescence-activated cell sorting and transferred in the culture medium.
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