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2 protocols using cd25 percp cy5 5 pc61

1

Phenotypic Analysis of Activated T Cells

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Single cell suspension of splenocytes, lymph node cells, or thymocytes were made, and these were stained with antibodies CD3-APC (OKT-3, BD Biosciences), CD4-V450 (RM4-5, eBioscience), CD8-V500 (RPA-T8, BD Biosciences company), Vβ8-PE (F23.1, BD Biosciences) KI-67-PerCp-Cy5.5 (BD56, BD biosciences), CD25-PerCp-Cy5.5 (PC61.5, Ebioscience), IFN-γ-FITC (XMG1.2, BD biosciences), CD44-APC (IM7, ebioscience), CD62L-FITC (MEL-14, BD biosciences) or FoxP3-eFluor450 (FJK-16s, ebioscience) and incubated for 30 min at 4°C. Cells were washed three times with PBS containing 2% FCS. Cells were acquired on the FACS Canto II (BD) and analyzed with FlowJo 7 (Tree Star). For cell activation experiments, splenocytes from transgenic mice or littermates were cultured (1 × 105 cells/well) for 24 h in the presence of 20 μg/ml mB29b, in which the last 4 h was in the presence of 1 μg/ml Brefeldin A.
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2

Multiparametric Flow Cytometry of Thymocyte Subsets

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Flow cytometric analysis was performed as described recently [54] . Cell suspensions isolated from thymi were labeled directly with the following fluorochrome-conjugated antimouse antibodies purchased from either BioLegend, BD Biosciences, or eBioscience: CD4-BV605 (RM4-5), CD8α-APC (53-6.7), CD25-PerCP-Cy5.5 (PC61.5), and human CD2-BV421 (RPA-2.10). Detection of active caspase 3/7 was accomplished using CellEvent™ Caspase-3/7 Red Detection Reagent (ThermoFisher Scientific). Sorted CD4SP Rag1 GFP+ thymocytes were stained with CD5-PerCP-Cy5.5 (53-7.3 ) and Nur77-PE (12.14) antibody (both from eBiosciences). Exclusion of dead cells was done by using the LIVE/DEAD™ Fixable Blue stain kit (Invitrogen). Cells were acquired on LSR Fortessa™ flow cytometer (BD Biosciences), and data were analyzed with FlowJo software (BD Biosciences).
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