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4 protocols using anti cd45ra apc cy7 hi100

1

Phenotyping CMV-specific T Cells

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Cryopreserved PBMCs were stained with cell trace violet (CTV; Thermo Fisher) (20 minutes, RT), and then stimulated with 1 μg/mL epitope peptide (NLVPMVATV; JPT Peptide Technologies) for 6 days at 37°C in 500 μL of 10% fetal bovine serum/RPMI 1640 medium (WELGENE). Cells were labeled with HLA-A∗0201-restricted CMVpp65 pentamer (HLA-A2∗0201: CMVpp56495, ProImmune). Next, surface molecule staining, dead cell staining, fixation, permeabilization, and intracellular molecule staining were performed using the following antibodies: anti-CD3-BV510 (HIT3a), anti-CD8-Percp-Cy5.5 (SK1; BD Biosciences), anti-CD19-PE-eFluor610 (HIB19), anti-CD14-PE-eFluor610 (61D3), anti-Ki-67-PE-Cy7 (20Raj1; Thermo Fisher), anti-CD45RA-APC-Cy7 (HI100), and anti-CCR7-BV785 (G043H7; BioLegend), and a Foxp3 Staining Buffer Set. Data were collected using an LSR II instrument.
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2

CMVpp65-Specific T Cell Activation Assay

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Cryopreserved PBMCs were labeled with HLA-A∗0201-restricted CMVpp65 pentamer (10 minutes, RT) and then stimulated with 1 μg/mL epitope peptide (NLVPMVATV) (4 hours, 37°C) in 200 μL/well of 10% fetal bovine serum/RPMI 1640 medium in 96-well round-bottom plates. Next, the cells were stained with interferon gamma and tumor necrosis factor (TNF) catch reagents (Miltenyi Biotec) (55 minutes, 37°C) on a rotator, and then with FITC-labeled anti-IFN-γ and PE-labeled anti-TNF detection reagents (Miltenyi Biotec) (10 minutes, 4°C). Next, cells were relabeled with pentamer (10 minutes, RT), and stained with anti-CD3-BV510 (HIT3a), anti-CD8-BV711 (SK1; BD Biosciences), anti-CD45RA-APC-Cy7 (HI100), and anti-CCR7-BV785 (G043H7; BioLegend). Data were collected using an LSR II instrument.
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3

Comprehensive T Cell Phenotyping

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T cells collected from duplicate wells were combined and stained with appropriate antibody conjugates for 30 minutes at 4°C, then washed and resuspended in 30 nM DAPI prepared in PBS. Cell populations were subsequently analyzed by flow cytometry (BD LSR II).
Antibody conjugates, Alexa Flour 647–anti-CD8 (RPA-T8), PE/Cy7–anti-CD4 (OKT4), Alexa Flour 700–anti-CD25 (BC96), FITC–anti-CD38 (HIT2), PE–anti–PD-1 (EH12.2h7), PerCP-Cy5.5–anti–LAG-3 (11C3C65), Dazzle–anti-CD27 (0323), and APC/Cy7–anti-CD45RA (HI100), and appropriate isotype controls were purchased from BioLegend. DAPI was bought from Thermo Fisher Scientific.
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4

Antigen-specific CD4+ T cell isolation

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Fresh PBMCs (10–20 × 106 cells, final concentration 10 × 106 cells/ml) were stimulated for 3 h at 37°C with 0.6 nmol/ml PepTivator C. albicans MP65 (pool of 15-amino-acid-length peptides with 11 amino acid overlap, Miltenyi Biotec) in RPMI + 5% human serum in the presence of 1 μg/ml anti-CD40 (HB14, Miltenyi Biotec). After stimulation, the PBMCs were labeled with PE-conjugated anti-CD154 (5C8, Miltenyi Biotec) and enriched with anti-PE magnetic beads (Miltenyi Biotec) (41 (link)). After enrichment, the cells were stained with PerCP-Cy5.5 anti-CD4 (RPA-T4, Biolegend), AlexaFluor700 anti-CD3 (SK7, Biolegend), and APC-Cy7 anti-CD45RA (HI100, Biolegend), and the antigen-specific T cells were gated as CD3+CD4+CD45RACD154+ single live cells for single cell sorting.
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