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6 protocols using anti pd l2

1

Murine Monoclonal Antibodies for Immunodetection

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The following murine mAbs were used for IHC: W6/32 to detect HLA class I antigens (Dianova); bbm.1 to stain for β2m (kindly provided by G. Moldenhauer, German Cancer Research Center, Heidelberg, Germany); anti–HMB-45 (Dako) to detect melanoma cells; anti-CD3 (BD Pharmingen) to stain for T cells.
For flow cytometry, the mouse mAbs were as follows: anti–HLA-ABC-APC (eBiosciences), anti–CD54-PE and anti–HLA-DR-PECy7 (Beckmann Coulter), anti–PD-L1-PE and anti–PD-L2 (Biolegend), anti–B7-H3 (R&D Systems), anti–B7-H4 (eBiosciences); L243 was used for detection of HLA-DR molecules (17 (link)) and HC10 for labelling of β2m-free HLA heavy chains (18 (link), 19 (link)).
The following antibodies were used for Western blot analysis: mouse anti–Melan-A/MART-1 (Zytomed), mouse anti-Tyrosinase and anti-MITF (Santa Cruz Biotechnology), rabbit anti-DCT/TRP2 (kindly provided by V. Hearing, National Cancer Institute, NIH, Bethesda); mouse anti-STAT1, rabbit anti-phospho(p)STAT1, rabbit anti-JAK1, rabbit anti-GAPDH (Cell Signaling Technology); rabbit anti-IRF1 and mouse anti-β2m (Santa Cruz Biotechnology); rabbit anti-β2m (Sigma); mouse anti-TAP1 (NOB-1) and mouse anti-tapasin (TO-3; ref. 20 (link)); mouse mAb HC10 (18 (link), 19 (link)).
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2

Quantifying Murine Peritoneal Macrophages

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Peritoneal exudate cells (PECs) were obtained from naïve or infected mice by injecting 10 mL of ice-cold PBS. For flow cytometry, single cell suspensions of the PECs obtained during the sacrifice were stained with anti-F4/80, anti-PDL2, anti-IL-4Rα, anti-MGL1, and anti-MGL2 antibodies (Biolegend, San Diego, CA), for 30 min at 4°C. The cells were washed twice and analyzed using the FACSCalibur system and Cell Quest software (Becton Dickinson, USA).
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3

Modulation of Immune Ligand Expression

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Modulation of inhibitory and activating ligands was assessed using the following antibodies: mouse anti-MICA and MICB (R&D Systems), mouse anti–MHC class I (clone W6/32), anti-CD155 (R&D Systems) followed by secondary antibodies RPE-conjugated goat anti-mouse IgG (Jackson ImmunoResearch Laboratories). PE-conjugated anti-TRAIL-R1, anti-TRAIL-R2, anti-CD95, anti-CD112 and FITC-conjugated anti-CD48 were purchased from Beckman Coulter. PE-conjugated anti PD-L1 and anti-PD-L2 were purchased from BioLegend. Data were analyzed using the FlowJo software (Flow Jo LLC).
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4

Profiling Macrophage Surface Markers

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BMDMs were suspended in fluorescence-activated cell sorting (FACS) buffer and incubated with Fc block (anti-mouse CD16/32; BioLegend). Cell surface markers were stained with anti-F4/80 (123108 or 123124; BioLegend), anti–PD-L1 (124308; BioLegend), anti–PD-L2 (107214; BioLegend), anti-Trem2 (FAB17291G; R&D) and, for live/dead staining, with LDFA (LIVE/DEAD Fixable Aqua Dead Cell Stain Kit; L34957; Thermo Fisher Scientific). Afterward, the cells were washed, permeabilized with the Foxp3/Transcription Factor Staining Buffer Set (00-5523-00; Thermo Fisher Scientific), blocked with 2% normal mouse serum (Invitrogen), and stained for intracellular Arg1 (17-3697-82; Thermo Fisher Scientific). The cells were washed twice and then resuspended for analysis on a BD LSRFortessa FACS flow cytometer. Gating strategy is shown in fig. S4C. For live/dead staining, APC Annexin V Apoptosis Detection Kit with PI (640932; BioLegend) was used, and the cells were sorted on a BD FACSAria. Data analysis was carried out using FlowJo software.
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5

Multiparameter Flow Cytometry Profiling of Immune Cells

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Antibodies used for flow cytometry were Alexa Fluor488-anti-CD11b, PerCP-eF710/PE/or PE-Dazzel594-anti-HLA DR (clone L243), eF450-anti-HLA DR (clone LN3) PE/Cy7-anti-CD14, APC-anti-CD33, BV510-anti-CD3, BV605-anti-CD19, PerCP-Cy5.5-anti-CD66b, Alexa Fluor700 or PerCP-Cy5.5-anti-IFNγ, APC/Cy7-CD38, PerCP-Cy5.5-anti-CD69, PE-anti-CX3CR1, -anti-B7-H4, -anti-PD-L1, -anti-B7-H3, -anti-PD-L2, -anti-ICOS-L (all from Biolegend, San Diego, CA); FITC- or APCeF780-anti-CD4, Alexa Fluor700- or eF450-anti-CD25, PE-anti-FoxP3 and eF450-anti-IL10 (all from eBioscience); PE-anti- phospho-Zap70(pY292), PE-anti-phospho-Akt(pS473) from BD Biosciences. For neutralization studies, mAb to IL-10, IL-6 or rat IgG isotype (10 μg/mL, Biolegend) and polyclonal goat anti-IL-27 or normal goat IgG control (10 μg/mL R&D Systems) control were used.
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6

Flow Cytometry Analysis of Immune Cells

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Spleen cells and PECs were analyzed by FACS at 2 days and 8 weeks post-infection and from non-infected mice. Cells were analyzed for the expression of different markers and were previously gated from a high forward light scatter (FSC)/high side light scatter (SSC) gate. For the assay, 1 × 106 cells were incubated with anti-CD16/CD32 antibody (Biolegend, San Diego, CA, USA) to block non-specific binding. Next, cells were stained with specific anti-F4/80, anti-PD-L1, anti-PD-L2, anti-MR, anti-CD11b, anti-Ly6C, anti-Ly6G (all from Biolegend), and anti-CCR2 (R&D Systems) and incubated for 30 min at 4 °C. Cells were washed twice with 1 mL of FACS buffer (1% FBS and 0.5% of sodium azide in PBS). Cell analysis was performed using the FACsAria system and FloJo software.
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