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2 protocols using ifn γ fitc clone 4 s b3

1

TRAP-stimulated CD4+ and CD8+ T cell Assay

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Frozen PBMC samples were thawed and rested for 6 hours at 37 °C in media containing 10U/ml of Benzonase (Novagen). Cells were then stimulated for a total of 16 hours with a single pool of TRAP peptides at 2 μg/ml final concentration, anti-CD28 APC (clone CD28.2, eBioscience), anti-CD49d (clone 9F10, eBioscience), anti-CD107a PECy5 (clone eBioH4.A3, eBioscience), Golgi-Stop and Golgi-Plug (BD Bioscience). Surface staining with CD95-bi (clone DX2, eBioscience) av-qDot565 (Invitrogen), CD4-APC H7 (clone L200, BD Bioscience), CD14 PE-Cy7 (clone M5E2, BioLegend), CD20 PE-Cy7 (clone 2H7, BioLegend) and live-dead Aqua was followed by fixation in 10% neutral buffered formalin (Sigma), prior to intracellular staining for CD3-PE (clone SP34–2, BD Bioscience), CD8 APC-H7 (clone RPA-T8, eBioscience) and IFN-γ FITC (clone 4 S.B3, BioLegend) in Perm-Wash Buffer (BD). All flow cytometry data were analysed using FlowJo (TreeStar) with cells gated based on size, doublet negative, CD3+ CD14/CD20, and either CD4+CD8 or CD4CD8+.
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2

PBMC Cytotoxicity Assay with IL-12/IL-18 Stimulation

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PBMCs from patients (n=69) and healthy controls (n = 4) were cocultured with K562 target cells at a 2:1 ratio for 4 hours in the presence of CD107a. Golgi Plug/Stop was added after 1 hour 26 (link). Intracellular cytokine-production was measured by IFN-γ and TNF-α. The following antibodies were used: CD107a-AF700 (clone H4A3, BD), Fixable Viability dye eF780 (eBioscience), CD56-PE (Beckman Coulter), the same antibodies as above for CD3, CD14, CD19, IFN-γ-FITC (clone 4S.B3, Biolegend), and TNFα-AF647 (clone Mab11, Biolegend). Recombinant human IL-12 (10ng/mL) and recombinant human IL-18 (100 ng/mL), both from R&D, were added to one well of PBMCs and incubated overnight for maximal cytokine stimulation. Where stated, patient samples were cultured in media containing the IL-15 superagonist ALT803 (1 nM) overnight prior to degranulation assays.
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