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6 protocols using hla dr bv605

1

Comprehensive Cytokine and T-cell Profiling

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Antibodies for intracellular cytokine staining included: anti-CD3-AF700, CD4-PcPCy5.5, CD8-PECF594, IFNg-FITC, CD14-V500, CD19-V500, TNFα-APC, CD38-PECy7, HLADR-BV605 (BD Biosciences); PD-1-PE, IL-2-BV421 (BioLegend); Live-Dead-AquaViD (LifeTechnologies).
The T regulatory cell/activation panel included: anti-CD3-AF700, CD25-PE, HLA-DR-FITC (BD); CD4-PETxR, CD8-APC AF750, Live-Dead-AquaViD (LifeTechnologies); CD39-PECy7, FOXP3-APC (eBioscience); CD127- PE Cy5.5 (Beckman Coulter); CD38- BV421 (BioLegend).
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2

Blocking Cytokines and Checkpoint Inhibitors in T-cell Assays

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Cells were thawed, washed and reconstituted in AIM V serum-free medium (Life Technologies, Oslo, Norway) containing 0.1% human serum albumin. After an overnight rest, cells were pulse-labelled with carboxyfluorescein diacetate succinimidyl ester (CFSE, Life Technologies) at a concentration of 2 μM for 5 minutes. The following blocking antibodies were added to parallel culture wells at a final concentration of 10 μg/mL: anti-IL-10 (R&D Systems, MN, USA; clone 23738), anti-TGF-β (R&D; clone 1D11), anti-PD-L1 (eBioscience, CA, USA; clone MIH1), and anti-HVEM (R&D; clone 94801).
After a 30 minute incubation, cultures were stimulated with either Gag or Env 15-mer overlapping peptide panels (NIH AIDS Research and Reference Reagent Program, MD, USA) at a final concentration of 2 μg/mL/peptide. Staphylococcal Enterotoxin B (SEB, Sigma-Aldrich, MO, USA) at a final concentration of 0.5 μg/mL was used as a positive control.
Cells were cultured at 37°C in 5% CO2 for 5 days, harvested, and stained with the following fluorochrome-conjugated antibodies: CD3 V450, CD8 APC-H7, HLA-DR BV605, CD45RA APC (all BD) and CD25 PE (Biolegend). 7-aminoactinomycin D (7-AAD, BD) was added for dead cell exclusion. Flow cytometry data were acquired on a BD FACS Canto II with BD Diva 6.1 software, and analyzed in FlowJo X (FlowJo LLC, OR, USA).
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3

Multiparametric Flow Cytometry Analysis

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Cells were surface stained, fixed, and refrigerated at 4°C overnight, followed by flow cytometry using the BD LSRII instrument according to manufacturer’s protocols (BD Biosciences, Carlsbad, CA, USA). An 11-color flow panel of cross-reactive antibodies was used: CD3 Alexa700, CD4 BD-V500, CD8 BD-V450, CD20 FITC, CCR5 PE, CXCR4 PE-CF594, CCR7 PE-Cy7, CD45RA PE-Cy5, CD14 APC, CD69 APC-H7, and HLA-DR BV605 (BD Biosciences). Samples were analyzed using FlowJo (TreeStar Inc, Ashland, OR, USA), and results graphed using GraphPad Prism 5 (Graphpad Software Inc, La Jolla, CA, USA).
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4

Multiparametric Flow Cytometry of T-Cell Subsets

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Cells were first stained with CD3-FITC, CD4-PE, CD8-APC-Cy7, CD45RA PE-Cy7, CD45RO-APC, CCR7-BV510, HLA-DR-BV605, and TCRγδ-BV421 (BD Biosciences). For intracellular staining with IFNγ-PE-Cy7, TNF-AL700, IL-2-BV421, and IL-17-BV510, cells were fixed and permeabilized using the BD Biosciences Cytofix/Cytoperm Kit. Data were acquired on BD LSRFortessa® (50,000 events), and cell frequencies, as well as median fluorescence intensity (MFI), were measured using FlowJo 10 software (Tree Star Inc.). Supernatants of PBMC cultures were collected and stored at -20°C for cytokine assays. Concentrations of IFNγ and IL-10 were measured by ELISA (R&D Systems) according to the manufacturer’s instructions.
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5

Analyzing Cytokine Secretion in EV-Treated PBMCs

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PBMC were cultured in RPMI supplemented with 10% FBS, 1% antibiotic antimycotic solution and 1% glutamine (Merck) for 16h in the presence of BD GolgiPlug™ Protein Transport Inhibitor (BD Biosciences). When indicated, PBMC were treated with HuCCT-1-derived EVs at a PBMC:EVs ratio of 1:50 for 16 h. After incubation, 5 × 105 PBMC were harvested and stained with anti-human CD14 BB700, CD3 BV421, HLA-DR BV605 and CD16 APC-H7 mAbs (all from BD Biosciences) for 30 min at 4 °C. Cells were subsequently fixed with BD Cytofix/Cytoperm (BD Biosciences) and permeabilized with the BD Perm/Wash buffer (BD Biosciences) in the presence of anti-human MIP-1α FITC, IL-1α PE and IL-8 BV510 mAbs according to the manufacturer’s instructions. FACSCelesta (BD Biosciences) instrument and Kaluza™ software (Beckman Coulter) were used for data acquisition and analysis.
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6

Profiling Antigen-Presenting Cells in Murine Spleen

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Spleens were finely minced and passed through a 70-μM nylon cell strainer (Becton Dickinson, Franklin Lakes, NJ). Spleen cells were collected in RPMI 1640 (Life Technologies, Paisley, Scotland) supplemented with 10% preselected fetal calf serum (FCS), 2 mM l-glutamine (both from Hyclone, Logan, UT), 100 U/mL penicillin, 100 mg/mL streptomycin (both from Life Technologies), and 5 × 10–5 M β-mercaptoethanol (Sigma-Aldrich). Single-cell suspensions were cleared of erythrocytes by hemolysis using a hypotonic buffer (pH 7.2) composed of 0.15 M ammonium chloride, 10 mM potassium bicarbonate (both from Merck, Darmstadt, Germany), and 0.1 mM ethylene-diaminetetraacetic acid (Life Technologies).
To evaluate the composition of APCs, splenocytes were stained for CD3e PerCP-eFluor 710 (clone 17A2, Thermo Fisher Scientific), CD19 FITC (clone 1D3, BD Biosciences), CD11c APC (HL3, BD Biosciences), CD11b PE-Cy7 (clone M1/70, Thermo Fisher Scientific) and HLA-DR BV605 (clone G46-6, BD Biosciences) and analyzed using a BD FACS Aria III (BD Biosciences) and FlowJo software (Version 10.8.1; BD Biosciences). Nonspecific binding through Fc gamma receptors was blocked by a mixture of anti-CD16 and anti-CD32 antibodies (Fc Block; BD Biosciences).
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