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5 protocols using b220 bv510

1

Multiparameter Flow Cytometry Analysis

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Spleens were mechanically disrupted, single-cell suspensions were generated, and red blood cells were lysed with ammonium chloride TRIS. Cells were resuspended in PBS containing 1% FBS and incubated with indicated antibodies. For analysis of cell surface markers, antibodies against the following molecules were used: B220-PE (RA3–6B2; BioLegend), B220-BV786 (RA3–6B2; BD Biosciences), B220-BV510 (RA3–6B2; BioLegend), CD4-BV711 (GK1.5; BioLegend), CD8 BV421 (53–6.7; BioLegend), CD138-PECy7 (281–2; BioLegend), CD69-BV786 (H1.2F3; BD Biosciences), CD86-PerCPCy5.5 (GL-1; BioLegend). After cell surface staining, the cells were fixed and permeabilized with Cytofix/Cytoperm (BD) (as per manufacturer’s instructions) and stained with Dylight650-E4 anti-Ars/A1 idiotype (produced and conjugated in our laboratory) OR HEL-650 (produced and conjugated in our laboratory) and Alexa Fluor 488-anti-GFP (rabbit polyclonal; Life Technologies). Events were collected on a CyAn ADP (Dako) and subsequent analysis using FlowJo software (Tree Star).
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2

Comprehensive FACS analysis of murine blood

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50 µl of blood was 1:1 diluted in PBS; lymphocytes were separated using 100 µl Lymphocyte Separation Medium 1077 (C-44010, PromoCell, Heidelberg, Germany). Cells were stained for 30 min/4 °C with: CD4-PE/Cy5 (1:1000; 130312), CD8a-PE/Cy7 (1:500; 100722), B220-BV510 (1:300; 103248), Gr-1-PE (1:1000; 108408), CD11b-PerCP/Cy5.5 (1:1000; 101227), F4/80-FITC (1:1000; 123107, all from BioLegend). Filtered samples were acquired on FACSAria Sorp (BD-Biosciences), and data analyzed by FlowJo software (BD-Biosciences).
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3

Tetramer-based Identification of Antigen-specific CD8+ T Cells

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Draining LNs were processed by glass slide maceration 7 days after injection, washed, and suspended in FACS (2% FBS in PBS) buffer containing Tetramer (SIINFEKL)-PE (1:400) (NIH tetramer core facility), CD8 APC-Cy7 (Biolegend clone 53-6.7 1:400) for 1 hr at 37C. Cells were washed and stained for 30 min in CD44 PerCP Cy5.5 (Biolegend clone IM7, 1:400), B220 BV510 (Biolegend clone RA3-6B2, 1:300). Samples were ran on the FACS Canto II flow cytometer (BD).
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4

Multicolor Flow Cytometry of Heart Cells

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Cytofluorimetric analysis was performed as previously described [29 (link),30 (link)]. Briefly, hearts were collected and cut into small pieces with a blade, and then incubated with collagenase type IV for 1 h and 30′ at 37 °C with agitation. The obtained cell suspension was passed through a 70 μm and then a 40 μm cell strainer; the cells were then counted on a hemacytometer, collected by centrifugation at 1200 rpm, and suspended in 200 μL of calcium/magnesium-free PBS (phosphate-buffered saline) with 2% FBS (foetal bovine serum). They were then divided into two tubes for the staining. The cells were then incubated on ice for 30 min with the following antibodies: CD45 PE/Cy7, F4/80 APC, Ly6g PE Fluor 610, CD11b APC/Cy7, CD206 PERCP/Cy5.5 Ly6c BV-510, I-Ab FITC (tube 1) and CD45 PE/Cy7, CD3 PERCP Cy5.5, B220 BV-510, CD4 AF488, and CD8 PE (tube 2), all by Biolegend, (San Diego, CA, USA). Cells were then washed with 3 mL of calcium/magnesium-free PBS and resuspended in 200 μL of calcium/magnesium-free PBS with 2% FBS. Samples were acquired with a CyAn ADP (Agilent DAKO, Santa Clara, CA, USA), and acquired data were analysed using FlowJo software version 10.1.
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5

Multiparameter Flow Cytometry Profiling

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After resuspension of mechanically dissociated cells in fluorescence-activated cell sorting (FACS) buffer (pH = 7.4, 0.1M PBS, 1 mM EDTA, 1% BSA), the cells underwent staining with conjugated antibodies/dyes. Conjugated antibodies were diluted 1:200 in FACS buffer, and the following antibodies and dyes were used: Ghost UV450 (Tonbo Biosciences, Catalog #: 13-0868-T500) to visualize live/dead cells; The copyright holder for this preprint this version posted October 9, 2020. ; https://doi.org/10.1101/2020.10.08.331801 doi: bioRxiv preprint (Biolegend, Catalog #: 100721); CD4 BUV496 to visualize T helper cells (BD Bioscience, Catalog #: 564667); B220 BV510 to visualize B cells (Biolegend, Catalog #: 103247); and PDL-1 PE-Cy7 to visualize the tolerogenic ligand PDL-1 (Biolegend, Catalog #: 124313). After staining for 30 minutes at 4ºC, cells were washed three times in FACS buffer and processed using a BD LSR II. For the CD45 IV timing experiments, cells were processed with Cytek's 3-laser Northern Lights.
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