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6 protocols using facsymphony a5 laser analyzer

1

Retinal Immune Cell Profiling by Flow Cytometry

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Eyes were enucleated and stored briefly in HBSS (14,025,076, Gibco, Carlsbad, CA). Eyes were dissected on a microscope to isolate retina alone. The retina was cut into at least four pieces and digested in Liberase TL for one hour at 370C with shaking (200 RPM). Post digestion, retinal cells were treated identically to our previously published flow cytometry procedure [23 ]. Briefly, a single cell suspension was obtained and stained for innate immune cell markers (see Table 2). Samples were run on a FACSymphony A5-Laser Analyzer (Becton Dickinson, CA, USA). Experiments were performed on two separate days and combined.

Flow cytometry antibodies

AntibodyFluorophoreManufacturer, product number
Fc blockBD Biosciences, 553,142
Aqua Live/DeadAmCyanThermoFisher, 65–0866-14
CD45BUV395BD Biosciences, 564,279
CD64PEBD Biosciences, 139,304
CD11bAPC-Cy7BD Biosciences, 557,657
Ly6GPE-CF594BD Biosciences, 562,700
B220PE-CF594BD Biosciences, 562,313
NK1.1PE-CF594BD Biosciences, 562,864
SiglecFPE-CF594BD Biosciences, 562,757
CD4PE-CF594BD Biosciences, 562,314
CD8PE-CF594BD Biosciences, 562,315
Ly6CFITCBD Biosciences, 561,085
Cx3Cr1Alexa Fluor 647Biolegend, 149,004
CD206PE-Cy7Biolegend, 141,720
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2

Isolation and Analysis of Retinal Immune Cells

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Eyes were enucleated directly into HBSS. Eyes were dissected to isolate retina and choroid/RPE/sclera complex. Retina and choroid/RPE/sclera complex were cut into 4 pieces and digested in Liberase TL for 1 hour at 37°C with shaking (200 rpm). After digestion, single-cell suspensions were treated identically to our previously published flow cytometry procedure (22 (link)). The innate immune cell marker antibodies can be found in Table 1. Samples were run on a FACSymphony A5-Laser Analyzer (Becton Dickinson), and data were analyzed using FlowJo version 10 (FlowJo).
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3

Immunophenotyping of Cell Surface Markers

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Approximately 1 × 106 cells were incubated for 15 min with allophycocyanin (APC)-conjugated mouse anti-CD44 (BD Biosciences, 560890) and phycoerythrin ( PE)-conjugated mouse anti-CD24 (BD Biosciences, 560991) according to instructions provided by the manufacturer. Cells were analyzed using a flow cytometer instrument (BD FACSymphony A5-Laser Analyzer) equipped with FACSDiva software.
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4

Murine Lung Cell Characterization

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Mouse lung was digested and single-cell suspensions were prepared as previously described (46 (link)). Cell suspensions underwent red blood cell lysis using Pharm Lyse buffer (BD Biosciences). Live/dead staining was performed in protein-free solution (HBSS) using fixable viability dye eFluor 506 (eBioscience), followed by incubation with FcR-blocking reagent (Miltenyi Biotec). Antibodies utilized for murine cell staining included rat anti–mouse CD45–FITC (BioLegend, 30-F11), rat anti–mouse Ly6C–eFluor450 (eBiosciences, HK1.4), rat anti–mouse I-A/I-E–PerCPCy5.5 (BioLegend, M5/114.15.2), rat anti–mouse CD45–APC (BioLegend, 30-F11), rat anti–mouse Ly6G–Alexa Fluor 700 (BioLegend, 1A8), rat anti–mouse NK1.1–Alexa Fluor 700 (BD, PK136), rat anti–mouse CD11b–APCCy7 (BioLegend, M1/70), rat anti–mouse CD64–PE (BioLegend, X54-5/7.1), rat anti–mouse SiglecF–PECF594 (BD, E50-2440), and rat anti–mouse CD11c–PECy7 (BD, HL3). For neutrophil quantification, 123Count eBeads (Invitrogen) were added. Flow analysis of fixed samples was done on a BD FACSymphony A5-Laser Analyzer at the Northwestern University Robert H. Lurie Comprehensive Cancer Center Flow Cytometry Core facility. Acquired data were analyzed with FlowJo v10.8 (FlowJo).
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5

Comprehensive Immune Cell Profiling

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Single cell suspensions were incubated with blocking CD16/32 antibody (BioLegend #101301) and then Fixable Viability Dye (ThermoFisher Scientific). All staining used 0.5-5x106 cells stained in 100ul 3% FBS in PBS with antibodies at manufacturer’s recommendation unless otherwise specified. Antibodies included CD4(GK1.5), CD8(53–6.7), CD25(A18246A), CD44(IM7), CD62L(MEL-14), CD45(QA17A26), CD45.1(A20), CD45.2(104), CD45RB (C363-16A), IL7Ra(A7R34), CCR7(4B12), TIGIT(1G9), ICOS (C398.4A), and GITR(DTA-1). Surface-directed antibodies were stained for 20 min at 4°C then washed before analysis or intracellular staining. For detection of intracellular proteins, the Foxp3/Transcription Factor Staining Buffer Set (Thermofisher Scientific #00-5523-00) was used. Intracellular Antibodies included FOXP3 (FJK-16s), IFNγ (XMG1.2), IL17A(TC11-18H10.1), GM-CSF(MP1-22E9), IRF8 (V3GYWCH), IRF4(IRF4.3E4), HELIOS (22F6), TCF-1(S33-966). For samples requiring intracellular cytokine staining cells were first incubated for 4 h with 25 ng/mL PMA, 0.5uM ionomycin, and 10 μg/mL monensin. All analysis was performed on a BD LSRFortessa X-20 Analyzer and a BD FACSymphony A5-Laser Analyzer. All cell sorting was performed on BD SORP FACS Aria II or Miltenyi Tyto. All analysis was performed on FlowJo v10 (BD).
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6

Single-cell Analysis of Transplanted Lungs

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Lungs harvested 24 hours following orthotopic lung transplantation were processed to a single-cell suspension and were stained according to a previously described method (69 (link)). Antibodies used for lung staining can be found in Supplemental Table 1. Samples were run on a BD FACSymphony A5-Laser Analyzer at the Northwestern University Robert H. Lurie Comprehensive Cancer Center Flow Cytometry Core Facility and then subsequently analyzed with FlowJo v10.6.2 (FlowJo).
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