For flow cytometry, the following fluorochrome-conjugated monoclonal antibodies were used: from BD Biosciences, HLA-DR-allophycocyanin (APC) (clone G46-6), CD8-PB (clone RPA-T8), IL-10-phycoerythrin (PE) (clone JES5-16E3), CD86-fluorescein isothiocyanate (FITC) (clone FUN-1), CD80-PE (clone L307.4), CD83-APC (clone HB15e), CD274-FITC (clone MIH1), CD252-PE (clone iK-1), CD275-PE (clone 2D3/B7-H2), CD273-PE (clone, MIH18), CD25-FITC (clone M-A251), CD127-BV421 (clone HIL-7RM21), CD279-APC (clone M1H4), IFN-γ-FITC (clone 4S.B3), IL-4-PE (clone MP4-25D2); from eBioscience: FoxP3-APC (clone 236A/E7), IL-2-APC (clone MQ1-17H12), IL-17A-PE (clone eBio64cap17), IL-17A-FITC (clone eBio64DEC1); from Beckman Coulter: CD40-PE (clone MAB89); from BioLegend: CD4-PerCP (clone SK3); and from Miltenyi Biotec, TNF-α-APC (clone cA2).
Cell viability was detected using the fixable viability dye eFluor 506 (eBioscience).