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2 protocols using apc cy7 anti mouse cd8a

1

Multiparametric Flow Cytometry Analysis of Immune Cell Subsets

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Flow cytometry was used to characterize the peripheral blood mononuclear cells (PBMCs) and splenocytes. Peripheral blood was collected via retro-orbital bleeding. Splenocytes were collected from spleens that were homogenized by grinding between glass slides. The cells were stained with the following antibodies conjugated to fluorophores: Alexa Fluor 700- anti-mouse CD4 (BD Biosciences, San Jose, CA, United States), PE-Cy5- anti-mouse CD25 (eBioscience, San Diego, CA, United States), PE-CF594- anti-mouse Foxp3 (BD Biosciences), PE- anti-mouse CTLA-4 (eBioscience), FITC-anti-mouse Helios (Biolegend, San Diego, CA, United States), PE-anti-mouse CD11b (BD Biosciences), APC-Cy7 anti-mouse CD8a (BD Biosciences), and Alexa Fluor 700-anti-mouse B220 (eBioscience). The cells were fixed and permeabilized before staining with the eBioscience Foxp3/transcription factor staining buffer set. Flow cytometry was performed on a LSRII flow cytometer (BD Biosciences) and data were analyzed using FlowJo software (FlowJo LLC, Ashland, OR, United States). Gating strategy is included in the Supplementary Figure 1.
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2

Immunohistochemistry, Western Blot, and Flow Cytometry Analyses of PD-L1 in Osteosarcoma

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Antibodies for immunohistochemistry were anti‐PD‐L1 (10084‐MB55; Sino Biological), anti‐Ki‐67 (ab16667; Abcam). Antibodies for western blot analyses were anti‐PD‐L1 (ab213524; Abcam), anti‐phospho‐STAT3 (9145; Cell Signaling Technology), anti‐STAT3 (9139; Cell Signaling Technology), and anti‐GAPDH (5174; Cell Signaling Technology). Antibodies for flow cytometry were APC‐anti‐human PD‐L1 (563741; BD Biosciences), BV421‐anti‐mouse PD‐L1 (564716; BD Biosciences), APC‐anti‐human CD3 (555342; BD Biosciences), PE‐anti‐human CD8 (561949; BD Biosciences), APC‐anti‐mouse CD3 (553059; BD Biosciences), PE‐anti‐mouse CD4 (557308; BD Biosciences), APC‐CY7‐anti‐mouse CD8a (561967; BD Biosciences), PE‐CY7‐anti‐mouse CD8a (561097; BD Biosciences). Lymphoprep density gradient centrifugation was purchased from Axis‐Shield (1114546; Axis‐Shield). Neutralizing Abs were anti‐human PD‐L1 neutralizing Ab (16‐5983‐82; eBioscience) and anti‐mouse PD‐L1 neutralizing Ab (16‐5982‐85; eBioscience). STATTIC was purchased from Selleck (S7024). Human recombinant TSP1 (3074‐TH‐050; R&D Systems), mouse recombinant TSP1 (7859‐TH‐050; R&D Systems), human IFN‐γ (C005; Novoprotein), human IL‐6 (C009; Novoprotein), and IL‐10 (CX04; Novoprotein) were used to stimulate osteosarcoma cells.
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