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5 protocols using anti pe and anti apc microbeads

1

Detecting Insulin-Specific CD4+ T Cells

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Insulin-specific CD4+ T cells were detected using insB10-23r3:I-Ag7 tetramer reagent and dual color staining with magnetic enrichment as described [24 (link), 25 (link)]. Briefly, single cell suspensions were incubated for one hour at room temperature with 10 nM of tetramers conjugated to phycoerythrin (PE) and allophycocyanin (APC) in medium containing Fc receptor block (2.4G2) and 0.05% sodium azide. Spleen and non-draining lymph node samples were subjected to magnetic enrichment following a 30 minute incubation with both anti-PE and anti-APC microbeads at 4°C (Miltenyi Biotec). Single cell suspensions from the pancreas were isolated using collagenase P digestion (Roche) and discontinuous Percoll gradients (44%/67%) [24 (link), 25 (link)]. Following tetramer staining, single cell suspensions from pancreas and pancreatic lymph node were subjected to surface staining for flow cytometric analysis.
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2

Detecting Insulin-Specific CD4+ T Cells

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Insulin-specific CD4+ T cells were detected using insB10-23r3:I-Ag7 tetramer reagent and dual color staining with magnetic enrichment as described [24 (link), 25 (link)]. Briefly, single cell suspensions were incubated for one hour at room temperature with 10 nM of tetramers conjugated to phycoerythrin (PE) and allophycocyanin (APC) in medium containing Fc receptor block (2.4G2) and 0.05% sodium azide. Spleen and non-draining lymph node samples were subjected to magnetic enrichment following a 30 minute incubation with both anti-PE and anti-APC microbeads at 4°C (Miltenyi Biotec). Single cell suspensions from the pancreas were isolated using collagenase P digestion (Roche) and discontinuous Percoll gradients (44%/67%) [24 (link), 25 (link)]. Following tetramer staining, single cell suspensions from pancreas and pancreatic lymph node were subjected to surface staining for flow cytometric analysis.
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3

Tetramer-Based Enrichment of Antigen-Specific T Cells

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PBMCs (2.4–10 × 106) were stained with WT HLA-A2S269–277-PE and variant HLA-A2S269–277-APC tetramers at room temperature for 1 h in MACS buffer (PBS with 0.5% BSA and 2 mM EDTA). Cells were then incubated with anti-PE and anti-APC microbeads (Miltenyi Biotec), and tetramer+ cells were enriched using magnetic separation (9 (link)). Lymphocytes were stained with anti-CD71-BV421 (#562995), anti-CD4-BV650 (#563875), anti-CD27-BV711 (#563167), anti-CD38-BV786 (#563964), anti-CCR7-AF700 (#561143), anti-CD14-APC-H7 (#560180), anti-CD19-APC-H7 (#560177), anti-CD45RA-FITC (#555488), anti-CD8-PerCP-Cy5.5 (#565310), anti-CD95-PE-CF594 (#562395), anti-PD1-PE-Cy7 (#561272) (BD Biosciences), anti-CD3-BV510 (#317332), anti-HLA-DR-BV605 (#307640) (BioLegend), and LIVE/DEAD near-infrared stain (#L10119, Invitrogen) for 30 min, fixed with 1% PFA before acquiring data on an LSRII Fortessa (BD Bioscience). FCS files were analyzed using FlowJo v10 software.
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4

Tet-labeled Cell Enrichment Protocol

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Tet–labeled cells were enriched using anti-PE and anti-APC microbeads and magnetized columns (Miltenyi Biotech) as described previously (33 (link)). For details, see SI Appendix.
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5

Quantifying MCMV-specific CD8+ T Cells

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To determine the endogenous naive precursor frequency of MCMV-specific CD8+ T cell populations in C57BL/6 and BALB/c mice, enrichment assays of antigen-specific CD8+ T cells were performed as described [42 (link)]. In short, single cell suspensions were generated from pooled spleen and lymph nodes (mesenteric, inguinal, cervical, axillary, and brachial) of individual mice. Cells were stained with PE and APC-labelled MHC class I tetramers for 0.5 h at RT, then washed, labelled with anti-PE and anti-APC microbeads (Miltenyi Biotec), and passed over a magnetized LS column (Miltenyi Biotec). The tetramer-enriched fractions were stained with fluorochrome labelled Abs against CD3 (clone 500A2), CD4 (clone L3T4), CD8 (clone 53–6.7) for 30 min at 4°C, and subsequently analysed. Samples were acquired with the LSRFortessa cytometer (BD Biosciences).
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