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4 protocols using anti btla pe

1

Murine Splenocyte Cytokine Profiling

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2x106 splenocytes from each sample were plated in a 96-well plate. After centrifugation, cells were resuspended and incubated in culture medium (R10) consisting of RPMI 1640 containing 10% FBS (Mediatech, Herndon, VA), 2mM L-glutamine, 0.01 M HEPES buffer, 100mg/ml gentamicin (Mediatech), and 5×10-5M 2-mercaptoethanol (Sigma-Aldrich, St. Louis, MO). To test intracellular cytokine, cells were stimulated with 30 mg/ml PMA and 400 ng/ml ionomycin in the presence of GolgiStop (BD Pharmingen) for 4 hours at 37°C.
After incubation and stimulation, cells were surface-stained with anti-CD3-PB (BD), anti-CD4-PerCP (BD), anti-CD8-PO (Biolegend), anti-BTLA-PE, anti-2B4-APC, anti-PD-1-APC-Cy7 (all from eBioscience). Then cells were permeabilized using fixation and permeabilization solution (BD). We used anti-IL-2-FITC (BD), anti-TNF-PE-Cy7 (Biolegend) and anti-IFN-γ-Alexa 700 (BD) for intracellular cytokine staining. In some experiments, cells were stained intracellularly for Ki-67 using the Foxp3 staining kit (BD Pharmingen). Samples were analyzed on an LSRII flow cytometer (BD) and data were analyzed using FlowJo software (FlowJo, LLC) and SPADE (Cytobank.org) (see below).
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2

Antigen-Specific T Cell Immune Response

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Groups of mice were sacrificed at the following time points: uninfected (day 0) and post-infection (days 5 and 14). At the indicated time points, spleens were collected from all animals and single cell suspensions were prepared. Cells were stained with anti-CD4-PO (Invitrogen), anti-CD44-FITC and anti-Thy1.1-PerCP (all from BD Pharmingen), anti-CD8-PB, anti-PD-1-FITC, anti-BTLA-PE, and anti-2B4-allophycocyanin (all from eBioscience).
For intracellular cytokine staining, single-cell suspensions of splenocytes were plated in a 96-well plate (1×106 cells per well) in culture medium containing RPMI 1640 containing 10% FBS (Mediatech, Herndon, VA), 2 mM L-glutamine, 0.01 M HEPES buffer, 100 mg/ml gentamicin (Mediatech), and 5×10−5 M 2-mercaptoethanol (Sigma-Aldrich, St. Louis, MO). Cells were incubated for 4 h in 10 nM OVA257-264 (SIINFEKL; Emory University Microchemial Core Facility) and 10 mg/ml brefeldin A (Pharmingen). Following incubation, cells were stained with anti-CD4-PO (Invitrogen), anti-Thy1.1-PerCP (BD Pharmingen), and anti-CD8-PB (eBioscience) and processed using an intracellular staining kit (BD Biosciences) and stained with anti-IFN-γ-Alexa 700 and anti-IL-2-FITC (BD Biosciences). All samples were run on a LSRII flow cytometer (BD Biosciences), and data was analyzed using FlowJo 9.5 Software (Tree Star, San Carlos, CA).
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Analyzing Lymphocyte Responses in LLC Tumor Model

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LLC cells were seeded in 12-well plates at a density of 1×105 cells/well for 24 h and were transfected with IDO1- or GL2-siRNA. After 24 h of transfection, lymphocytes isolated from the spleen of LLC-bearing C57BL/6 mice (33 (link)). Briefly, spleens (~1 cm in length and 30 mm in width) were placed on a 40 µm Falcon Cell Strainer (VWR International, LLC.) and gently squashed with a plunger. The cell suspension was collected to centrifuge at 4°C, 250 g for 5 min, then further isolated using ACK Lysing Buffer (Beijing Solarbio Science & Technology Co., Ltd.) to lyse red blood cells. Lymphocytes were added to the LLC cells at a density of 5×105 cells/well and were cultured at 37°C with 5% CO2 for 48 h. Lymphocytes were subsequently collected and stained with anti-CD4-FITC (cat. no. 553047; 1:200; BD Pharmingen; BD Biosciences), anti-CD8-PE (cat. no. 12-0081-82; 1:200; eBioscience; Thermo Fisher Scientific, Inc.), anti-PD-1-APC (cat. no. 17-9985-82; 1:200; eBioscience; Thermo Fisher Scientific, Inc.) and anti-BTLA-PE (Cat. no. 12-5950-82; 1:200; eBioscience; Thermo Fisher Scientific, Inc.), incubated at 4°C in dark for 30 min, then detected using flow cytometry (BD FACSCanto II; BD Biosciences). The data were analyzed suing FlowJo version 10 software (Becton, Dickinson and Company).
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4

Phenotypic Characterization of Splenic T Cells in Sepsis

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Mice were sacrificed and spleens were harvested 24-hours post CLP. Splenocytes were stained with anti-CD3-Alexa 700 (BD), anti-CD4-PB (BD), anti-CD8-PO and anti-CD44-PerCP (Biolegend). Cells were also surface stained with anti-CD25-FITC (Biolegend), anti-CD69-PE (Biolegend), anti-CD62L-PE Cy7 (BD), and anti-BTLA-PE, anti-2B4-APC, anti-PD-1-APC-Cy7, anti-LAG-3-FITC (all from eBioscience) for phenotypic analysis. An LSR II flow cytometer (BD Biosciences) was used to run all samples. Accucheck Counting Beads (Thermo Fisher Scientific) were added during staining to calculate the absolute number of T cells per spleen. Flow data were analyzed using FlowJo software (FlowJo, LLC) and SPADE (Cytobank.org) (see below).
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