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6 protocols using live dead near ir viability dye

1

Quantification of Tumor-Infiltrating Fibroblasts

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Tumors were excised on day 20 post-inoculation and processed on GentleMACS Octo Dissociators using Mouse Tumor Dissociation Kits (both from Miltenyi Biotec, San Diego, CA, USA). Resulting single-cell suspensions were stained with LIVE/DEAD-Near IR viability dye (Thermo Fisher, Carlsbad, CA, USA) and Brilliant Violet 650-conjugated anti-mouse CD45 antibody (BioLegend, San Diego, CA, USA) according to manufacturer’s recommendations. Data were acquired on a Novocyte flow cytometer and analyzed using NovoExpress software (ACEA Biosciences, San Diego, CA, USA). GFP-expressing 3T3HAS3 fibroblasts were gated as live CD45- GFP+ cells and quantified as a percentage of the CD45- population (non-hematopoietic cells). For analyses of CD44 expression and HA binding of MDA-MB-468 shCD44 855 cells, cultured cells were dissociated with Accutase (BD Biosciences, San Jose, CA, USA) and stained with anti-mouse/human CD44 antibody IM7-phycoerythrin (eBioscience, San Diego, CA, USA) or sequential incubation with biotinylated HA [57 (link)] and streptavidin–phycoerythrin (SA–PE, R&D Systems, Minneapolis, MN, USA). CD44 expression and cell-associated HA levels in 3T3HAS3 CD44 KO cells were evaluated with the Alexa Fluor 488 anti-mouse/human CD44 antibody IM7 (BioLegend, San Diego, CA, USA) or sequential incubation with HTI-601 and SA–PE.
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2

Activation Kinetics of CD4+ T Cells

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Stably transduced (eGFP+) and internal control mock-transduced (eGFP-) cells were activated with irradiated autologous APCs at 1:1 in the presence of 2μg/mL anti-CD3 and 1μg/mL anti-CD28. The cultures were harvested at 0h, 4h, 24h, 48h, 72h, and 144h and stained with Live/Dead Near-IR viability dye (ThermoFisher). Next, the cells were washed into 2% FCS in PBS and labelled with CD278 (C398.4A, BioLegend), CD69 (FN50, BioLegend), CD4 (RPA-T4, BioLegend), CD226 (11A8, BioLegend), CD25 (BC96, BioLegend), CD279 (EH12.2H7, eBiosciences), CTLA4 (L3D10, BioLegend). The cells then were fixed in 1% formaldehyde in PBS. Data was acquired on an LSRFortessa (BD Biosciences) and was analyzed using FlowJo software (Flowjo LLC). Live lymphocytes from CD4+ T cell cultures were gated by forward and side scatter morphology, followed by viability dye exclusion before extracting surface marker expression. Fluorescence minus-one (FMO) controls were used to set gates for marker positivity.
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3

Anti-CD3 Stimulated Calcium Flux

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Stably transduced Tconv or Treg, and their mock-transduced internal control cells, were labeled with 2.5μg/mL FuraRed calcium responsive dye (ThermoFisher) in 1% BSA/HBSS at 37°C for 10 minutes, followed by labeling with Live/Dead Near IR viability dye (ThermoFisher). Cells were then resuspended in HBSS (with Ca2+) containing 10μg/mL goat anti-mouse IgG F(ab’)2 crosslinking antibody (Jackson ImmunoResearch). Next, cells were warmed to 37°C, and fluorescence at 605 nm by a 405 nm laser and at 660 nm by a 532 nm laser was collected on a LSRFortessa (BD Biosciences) to indicate high and low calcium, respectively (Supplemental Figure 3AC). After recording 30 seconds of basal fluorescence, anti-human CD3 (OKT3) was added at 1μg/mL, and fluorescence was acquired for two minutes. FlowJo software (FlowJo LLC) was used to analyze the mean fluorescence intensity (MFI) kinetics of FuraRed for the high and low [Ca2+] channels after first gating on live cells by forward and side scatter morphology and viability dye exclusion. The percent change from mock in fluxed calcium was calculated as the percent difference between curves of the mock and transduced cells (Supplemental Figure 3DG).
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4

Isolation and Characterization of Porcine Thymic NKT Cells

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Approximately 1 g of thymus tissue was collected from one male and
one female mix-breed pig at 22 weeks of age that were slaughtered at the
University of Florida’s Animal Sciences Department. Single cell
suspensions were generated using glass homogenizers, after which mononuclear
cells were isolated using Ficoll-Paque PREMIUM (GE Healthcare). Some cells
were set aside for scRNA-seq of total thymocytes. The remaining cells were
stained with Live/Dead Near-IR viability dye (Invitrogen) and a
phycoerythrin (PE)-conjugated alpha-galactosylceramide (aGC) analog
PBS57-loaded mouse CD1d (mCD1d) tetramer (National Institutes of Health
Tetramer Core Facility). Cell suspensions were subsequently incubated with
magnetically labeled anti-PE MicroBeads (Miltenyi Biotec), washed, and
loaded onto an LS column (Miltenyi Biotec). After washing, the labeled cells
were eluted and loaded onto an MS column for further enrichment. An equal
number of cells from both pigs were combined and sorted for live mCD1d
tetramer positive cells using a Sony SH800 Cell Sorter (Sony Biotechnology).
Aliquots from the sorted cells were co-stained with allophycocyanin
(APC)-conjugated PBS57-loaded or unloaded mCD1d tetramers to validate their
specificity for the CD1d tetramer-PBS57 antigen complex by FACS. The
thymocyte samples were stained with Live/Dead Near-IR viability dye and FACS
sorted for live cells.
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5

Isolation and Characterization of Porcine Thymic NKT Cells

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Approximately 1 g of thymus tissue was collected from one male and
one female mix-breed pig at 22 weeks of age that were slaughtered at the
University of Florida’s Animal Sciences Department. Single cell
suspensions were generated using glass homogenizers, after which mononuclear
cells were isolated using Ficoll-Paque PREMIUM (GE Healthcare). Some cells
were set aside for scRNA-seq of total thymocytes. The remaining cells were
stained with Live/Dead Near-IR viability dye (Invitrogen) and a
phycoerythrin (PE)-conjugated alpha-galactosylceramide (aGC) analog
PBS57-loaded mouse CD1d (mCD1d) tetramer (National Institutes of Health
Tetramer Core Facility). Cell suspensions were subsequently incubated with
magnetically labeled anti-PE MicroBeads (Miltenyi Biotec), washed, and
loaded onto an LS column (Miltenyi Biotec). After washing, the labeled cells
were eluted and loaded onto an MS column for further enrichment. An equal
number of cells from both pigs were combined and sorted for live mCD1d
tetramer positive cells using a Sony SH800 Cell Sorter (Sony Biotechnology).
Aliquots from the sorted cells were co-stained with allophycocyanin
(APC)-conjugated PBS57-loaded or unloaded mCD1d tetramers to validate their
specificity for the CD1d tetramer-PBS57 antigen complex by FACS. The
thymocyte samples were stained with Live/Dead Near-IR viability dye and FACS
sorted for live cells.
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6

SIV Env Antibody Binding Assay

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CEM.NKR-CCR5-sLTR-Luc cells were infected with vif-deleted SIVmac239, with or without Env mutations and pseudotyped with VSV G by spinoculation at 1200 g for 1 hour in the presence of 40 μg/ml Polybrene. Antibody binding to Env was evaluated by staining the cells 3 days post-infection. The cells were treated with Live/Dead NEAR IR viability dye (Invitrogen), washed in staining buffer (PBS with 1% FBS), and then incubated on ice for 30 minutes with 10 μg/ml of Env-specific antibody or a 1:32 dilution of SIV+ plasma pool from chronically infected rhesus macaques used in other studies. A dengue virus-specific antibody (DEN3) was used as a negative control. An AF647-conjugated goat anti-human F(ab′)2 (Jackson Immunoresearch) and PE-Cy7-conjugated anti-CD4 (Clone OKT4, Biolegend) were used for subsequent staining on ice. For intracellular p27 staining, cells were fixed in PBS with 2% paraformaldehyde, washed in staining buffer, and stained with FITC-conjugated anti-SIV Gag antibody (clone 552F12) in Perm/Fix Medium B (Invitrogen). After washing, the cells were fixed in PBS with 2% paraformaldehyde and analyzed using a BD FACS Symphony flow cytometer. Antibody binding to Env was assessed by Env staining on the surface of SIV-infected (CD4lowGag+) cells.
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