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3 protocols using anti cd8 pe vio770

1

Analyzing Antigen-Specific T Cell Responses

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Splenocytes from immunized and control mice were isolated after the second immunization. Before staining, splenocytes were grown in RPMI 1640 (EuroClone) containing 10% heat-inactivated fetal bovine serum (FBS) (Life Technologies), 100 U/mL penicillin (EuroClone), 100 U/mL streptomycin (EuroClone), 100 μg/mL glutamine (EuroClone), 0.1 mM non-essential amino acids (EuroClone), 1 mM sodium pyruvate (EuroClone), 50 μM β-mercaptoethanol (EuroClone) and 10 U/mL IL-2 (Miltenyi Biotec). Cells were stimulated for 4 h with 0.25 μM ionomycin and 10 ng/mL phorbol myristate acetate (PMA) and 2 hours with 10 μg/ml brefeldin A. A total of 1.5 × 106 cells were stained in PBS 1X/0.5% bovine serum albumin/2 mM EDTA for 10 min at 4°C with the following antibodies (Miltenyi Biotec): anti-CD3 Vioblue; anti-CD4-APC, anti-CD8-PE-Vio770, anti-CD62L-FITC and anti-CD49d-PE for T cell detection. The cells were then fixed and permealized using the Miltenyi Biotec Inside Stain Kit and intracellularly stained according to the manufacturer’s instructions with IFN-γ-PE or APC (Miltenyi Biotec). The CD8 + CD3+; CD3 + CD4+ cells were gated and then analyzed by flow cytometry for IFN-γ production and for the evaluation of CD62L and CD49d expression. Flow cytometry acquisition was performed on a MACSQuant instrument, and the data were analyzed with the MACSQuantify Software (Miltenyi Biotec).
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2

Quantifying CD4 T Cell Depletion

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To compare infection kinetics and depletion in collagen and suspension cultures, cultures were first treated with collagenase I (100 U, Worthington) for 30 min at 37 °C to yield cell suspensions. Cells were washed in PBS and stained with fixable viability dye 450 (eBioscience, 1:1000 in PBS) for 30 min at 4 °C, were washed in MACS buffer (PBS, 2 mM EDTA, 0.5% inactivated FCS) and subsequently stained with anti-CD8-PE Vio770 (1:100, Miltenyi Biotec, 130-096-556) and anti-CD3-PE (1:100, biolegend, 317308) for 30 min at 4 °C. After washing, cells were fixed in 3% PFA/PBS for 90 min. To detect intracellular p24, cells were permeabilized and stained with anti-p24-FITC (1:100 KC57 Beckmann Coulter, 6604665) in 0.1% Triton-X-100/PBS for 30 min at 4 °C. Cells were washed in MACS buffer and for absolute cell quantification cell counting beads (biolegend) were added prior to analysis with a FACSVerse (BD) and FlowJo software (Tree Star). CD4 T cells were identified as CD3 positive/CD8 negative cells. Relative depletion was calculated by correlating the frequency of CD4 T cells in the respective sample to the frequency of CD4 T cells in T20 controls, which was set to 100%.
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3

Multiparameter Flow Cytometry Assay

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All cells were assessed for viability using a fixable viability dye (ebioscience eFluor506). Flow cytometric analysis of human and murine cells was performed using >50 antibodies and appropriate directly conjugated mouse, rat and hamster isotype controls. The clones . relevant to the majority of work are as follows: mouse anti-CD3-FITC (Miltenyi; REA641) anti-CD8a-PerCP (Miltenyi; 53-6.7) anti-CD28-PE (Miltenyi; 37.51) anti-KLRG1-APC (Miltenyi; 2F1). Human anti-CD3 APC-Cy7 (biolegend; HIT3a) anti-CD8-PE-Vio770 (Miltenyi; REA734) anti-CD28-eFluor450 (ebioscience; CD28.2) anti-KLRG1-AF488 (a generous gift from Professor Hanspeter Pircher, University of Freiburg) anti-CD57-Vioblue (Miltenyi; TB03) anti-CD244-FITC (biolegend; C1.7) anti-CX3CR1-PE (ebioscience; 2A9-1), and anti-IL-10-FITC (ebioscience; BT-10). For intracellular cytokine staining, cells were cultured with PMA (50 ng/ml), ionomycin (500 ng/ml), and monensin (3 µM; all from Sigma) for 4 h at 37C. Cells were stained for cell surface markers, then fixed and permeabilized in Cytofix/Cytoperm (BD) before intracellular detection of cytokines. Cells were acquired using a CyAn ADP (Beckman Coulter) flow cytometer and analysed using Summit software (software version 4.3; Beckman Coulter). Percentages and mean fluorescence intensity (MFI) were calculated against appropriate isotype controls.
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