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4 protocols using cd8α apc cy7

1

Multiparameter Flow Cytometry of Immune Cells

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Prior to flow cytometry, cells were washed in staining buffer (0.05% (w/v) BSA, 2 mM EDTA in 1× PBS) and treated with FcR blocking reagent (Miltenyi Biotec) for 10 min. Subsequently, In vitro differentiated single cell clones and Dox-pDC were stained with the following antibodies for 30 min at 4°C: CD11c-APC, MHC-I-FITC, MHC-II-PE, SiglecH-PE, CD86-PE-Cy7, CD289 (TLR9)-FITC, CD11b-V500, B220-PerCP, CD8α-APC-Cy7 (all BD Biosciences) and CD9-FITC (Thermo Fisher). T lymphocytes were stained with the following antibodies: CD3-FITC, CD4-V500, CD8α-APC-Cy7, CD44-APC and IFNγ-APC-Cy7 (all BD Biosciences); CD62L-PerCP-Cy5.5 and RORγt-PerCP-ef710 (all Thermo Fisher Scientific). Flow cytometry was performed using LSRII and FlowJo analysis software (V10; FlowJo, Ashland, USA).
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2

Engraftment Evaluation of Human HSPCs

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Human HSPC engraftment in NSG recipients was evaluated by peripheral blood (PB) lymphocyte typing using seven-color LSR II SORP flow cytometry 30 days after transplantation. Briefly, whole blood from NSG recipients was collected in heparinized tubes, and aliquots of 100 μl were stained with human-specific CD45 PE-Cy7, along with a combination of the following human mAb (BD Biosciences): CD8α APC-Cy7, CD4 Alexa 700, αβTCR PE, γδTCR PE, CD56 APC, CD19 APC, CD11c Alexa 700, HLA-DR PerCP and CD33 FITC. Tissue typing of PB lymphocyte, spleen and BM was performed 180 days after transplantation.
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3

Isolation and Sorting of Immune Cells

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Splenocytes were prepared from 12-week mice, erythrocytes were removed by incubation in lysis buffer (1:9 v/v 0.17M Tris: 0.16 M ammonium chloride) for 5 min and enriched splenocytes were resuspended in 2% FBS and 1 mM EDTA in Hank’s Balanced Salt Solution. For isolation of tumour lineages, dissected gp130F/F gastric tumours were chopped into ~3–4mm3 pieces and disaggregated non-enzymatically by incubation in dissociation buffer (5% FBS, 1 mM dithiothreitol, 1 mM EDTA in PBS) for 1 h at 37 °C with agitation. Digested tissue pieces were passed through a 70-μm strainer, and the cells were resuspended in 2% FBS and 2 mM EDTA in Hank’s Balanced Salt Solution. Splenocytes and gastric tumour cells were stained with CD11c-APC (1:500), CD8α-APC-Cy7 (1:500), CD45R/B221-FITC (1:500), CD11b-PE (1:500), Gr-1 (Ly6-G/C)-PerCP-Cy5.5 (1:300) (all from BD Biosciences) and NK1.1-brilliant violet 421 (1:300) E-cadherin-PE (1:300) (from BioLegend, San Diego, CA, USA). Cells were sorted (at low pressure with a 100-μm nozzle) on a MoFlo sorter (Beckman-Coulter, Brea, CA, USA). Cells were not cultured in the period between isolation and sorting.
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4

Enrichment and Characterization of Splenic APCs

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Spleens were perfused with collagenase D (1 mg/ml) and DNAse I (0.1 mg/ml), cut into small pieces and incubated at 37°C for 45 min. Cell preparations were filtered using 100‐μM cell strainers, and APC populations were enriched using magnetic depletion of B, NK, and T cells (Miltenyi). For experiments that focused only on cDC, cDC were enriched using CD11c‐positive selection (Miltenyi). Cell suspensions were labeled with the following antibodies: CD3‐APC (145‐2C11, 1/300 eBioscience), CD19‐APC (ID3, 1/300 Biolegend), NK1.1‐APC (PK136, 1/300 BD Pharmingen), B220‐BV510 (RA3‐6B2, 1/500, BD Horizon), CD11b PE‐CF594 (M1/70, 1/3000 BD Horizon), CD11c PE‐Cy7 (HL3, 1/400 BD Pharmingen), Ly6C‐PerCP‐Cy5.5 (AL‐21, 1/1000 BD Pharmingen), CD64 BV421 (X54‐5/7.1, 1/300 Biolegend), CD8α APC‐Cy7 (53‐6.7, 1/200 BD Pharmingen), or XCR1‐PE (REA707, 1/100 Miltenyi). Cells were sorted on a BD AriaSorp (BD Biosciences) with purity routinely higher than 95%. Expression of MHC II was assessed in a separate mix since the anti‐I‐Ab AF700 (M5/114, 1/500 BD Pharmingen) is a blocking antibody. For experiments with Karma mice in which cDC1 are Tomato+, CD11b‐PerCP‐Cy5 (M1/70, 1/200 BD Pharmingen) was used. All flow cytometry samples were run on a Fortessa (BD Biosciences) and analyzed using FlowJo software.
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