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3 protocols using pd l1 mih5

1

Multiparametric flow cytometry for immune cells

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Samples were blocked with 2% normal mouse serum. Fixable yellow (L34959, Invitrogen, Carlsbad, CA, USA) or 7AAD (Cat 00699350, eBioscience, Waltham, MA, USA) was used to stain live/dead cells. Anti-mouse antibodies used were CD3 (17A2, eBioscience), CD4 (GK1.5, BioLegend, San Diego, CA, USA), TCR Vα2 (KB5-C20, BD Pharmingen), CD8a (53-6.7, BioLegend), CD44 (IM7, Biolegend), CD62L (MEL-14, eBioscience), H-2Db (KH95, BD Pharmingen), H-2Kb (AF6–88.5, BD Pharmingen), PD-L1 (MIH5, eBioscience). Anti-human antibodies used were HLA ABC (W6/32, Biolegend), PD-L1 (29E.283, Biolegend), anti-mouse IgG2a K Isotype (Biolegend), and anti-mouse IgG2b K (Biolegend).
Fluorescence was measured on BD LSR Fortessa X-20 or BD FACSVerse flow cytometer (BD Biosciences, North Ryde, NSW, Australia) and data analyzed using the FlowJo, LLC software (BD Biosciences, Franklin Lakes, NJ, USA).
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2

Phenotypic Characterization of Immune Cells

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The individual performing FACS analysis was not blinded to genotype. Anti-mouse Abs CD4 (GK1.5, BD Pharmingen, Franklin Lakes, NJ, USA) and CD8 (53-6.7, BD Pharmingen) were used for the proliferation assay. Anti-mouse CD19 (1D3, BD Pharmingen), CD1d (1B1, BD Pharmingen), CD5 (53-7.3, BD Pharmingen), CD28 (37.51, BD Pharmingen), CD152 (CTLA-4, UC10-4B9), ICOS (C398-4A, BD Pharmingen), PD-L1 (MIH5, eBioscience), and PD-L2 (TY25, eBioscience) were used for this study. Single-cell suspensions were washed with staining medium (PBS containing 0.1% NaN3 and 2% FCS). After incubation with mAb and washing with staining buffer, propidium iodide (PI) was added to identify dead cells. FACS data acquisition was performed on a FACSCalibur flow cytometer (BD Biosciences, San Jose, CA, USA) and data were analyzed using isotype control Abs to set quadrants before calculating the percentage of positive cells, using FCS Express (De Novo Software, Los Angeles, CA, USA).
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3

Characterization of Immune Cell Phenotypes

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The cell surfaces was stained with antibodies at 4°C for 30 min. Specific antibodies against CD11b (M1/70), F4/80 (BM8), CD206 (MMR), PD-1 (J43) and PD-L1 (MIH5) were purchased from eBioscience (San Diego, CA). The samples were washed using PBS and fixed with 4% paraformaldehyde. The samples were analyzed using FACSCantoⅡTM flow cytometer (BD Biosciences, San Jose, CA). The data were analyzed using FlowJo software (Tree Star, Ashland, OR). Cell apoptosis was measured using a double staining with FITC-labeled Annexin V/Propidium Iodide (PI) Apoptosis Detection Kit (BD Biosciences) according to the manufacturer’s instruction. The apoptosis levels were examined by flow cytometry. For reactive oxygen species (ROS) measurement, the cells were pretreated with 10 mM NAC (Sigma-Aldrich, St. Louis, MO) for 24 h. Then, 10 μM DCF-DA (Sigma-Aldrich) was added to the cells for 30 min at 37°C, and DCF fluorescence was measured by flow cytometry.
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