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6 protocols using cd23 b3b4

1

Mouse Spleen Cell Isolation Protocol

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Eight-week-old C57BL/6 mice were used for analysis. Cells from total spleen were dispersed by mechanical force. Resulting single-cell suspension was filtered through a 70-mm nylon mesh. Red blood cells were lysed using Ammonium-Chloride-Potassium lysing buffer (Lonza) at 1 ml per spleen for an incubation of 1 min on ice. In all subsequent steps, cells were incubated in 1× PBS containing 1% bovine serum albumin at 4°C and processed similar to the human cells as described above with the following exceptions. Fc block was anti-mouse (BD Biosciences). Primary antibody panel was as follows: CD3 (145–2C11, BD Biosciences), CD19 (1D3, BD Biosciences), CD11b (M1/70, BD Biosciences), CD21 (7G6, BD Biosciences), CD45R (RA3–6B2, Invitrogen), IgM (II/41, BD Biosciences), CD23 (B3B4, BioLegend), IgD (11026C.2a, BioLegend), and CD93 (AA4–1, BD Biosciences). A subset of experiments required the addition of CD39 (DUHA59) and CD73 (TY/118, BioLegend) to this panel.
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2

Multiparametric Flow Cytometry Analysis

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Cell suspensions from mouse liver, BM (one femur and tibia), spleen, thymus, mesenteric lymph nodes, and peritoneal cavity were processed as previously described (47 (link)), and data were acquired on a FACSCanto10c (BD) and analyzed with FlowJo Software (Tree Star).
The following anti-mouse antibodies were used: B220 (RA3-6B2, BioLegend), BAFFR (7H22-E16,BD), BP-1 (6C3, BioLegend), CD3e (145-2C11, eBioscience), CD4 (GK1.5, eBioscience), CD5 (53-7.3, BioLegend), CD8 (53-6.7, BioLegend), CD9 (MZ3, BioLegend), CD11b (M1/70, eBioscience), CD19 (6D5, 1D3, BioLegend), CD21/CD35 (7E9, BioLegend), CD23 (B3B4, BioLegend), CD24 (M1/69, BioLegend), CD25 (PC61, Biolgend), CD43 (S7, BioLegend), CD44 (IM7, BioLegend), CD45.1 (A20, BioLegend), CD45.2 (104, BioLegend), CD69 (H1.2F3, BioLegend), CD80 (16-10A1, BioLegend), CD86 (GL1, BioLegend), CD93 (AA4.1, BioLegend), DAPI (BIOTIUM), Gr-1 (RB6-8C5, eBioscience), IgDa (AMS-9.1, BioLegend), IgD (11-26c, BioLegend), IgMa (DS-1, MA-69, BioLegend), IgM (Il/41, RMM-1, BioLegend), TCRγδ (GL3, BioLegend), Live dead dye (Zombie Aqua Dye, BioLegend), Live dead dye (Zombie NIR, BioLegend), pERK (4B11B69, BD), pPLCγ2 (K86-1161, BD), Lin28b (AP1485C, ABGENT), and anti-rabbit IgG (BioLegend).
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3

Multiparametric Flow Cytometry of Mouse B Cells

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Single-cell suspensions were stained with mAb against mouse B220 (RA3-6B2; BD Pharmingen; 1 : 200), IgM (331.12; 1 : 800), IgD (1126 C; 1 : 800), Gr-1 (RB6-8C5; 1 : 800), CD21 (7G6; 1 : 2000), CD23 (B3B4; Biolegend; 1 : 200), IgG1 (X56; BD Pharmingen; 1 : 300), IgG3 (pooled antisera; Southern Biotech; 1 : 250), CD138 (281-2; BD Pharmingen; 1 : 600), FcgR (2.4G2; 1 : 10), BAFF-R (7H22-E16; BD Biosciences; 1 : 100), CD40 (11-0402-86; eBioscience; 1 : 200) and CD98 (RL388; Biolegend; 1 :500). Cells were analyzed on FACSCanto flow cytometers and cell sorting was carried out using FACSDiVa or Aria flow cytometers (BD Biosciences). Intracellular staining for BCL6 (7D1) was performed using the FoxP3 staining buffer set (eBiosciences). All Abs were produced in-house unless otherwise indicated. Antigen-specific B cells were identified by binding NP coupled to phycoerythrin.
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4

Multiparameter Flow Cytometry Staining

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The following mAbs against mouse IgG1 (A85-1), IgG2b (RMG2b1), IgG2ab (5.7), IgG3 (R40-82), IgMb (AF6-78), CD38 (90), CD45R/B220 (RA3-6B2), CD95/Fas (Jo2), CD35 (8C12), CD11b (M1/70), CD11c (HL3), and CD8 (53-6.7) were purchased from BD Biosciences. Antimouse CD45.1 (A20), CD45.2 (104), CD3e (eBio500A2) were obtained from eBioscience. The mAbs against murine CD93/C1qR (AA4.1), CD21/35 (7E9), and CD23 (B3B4) were obtained from BioLegend, and anti-mouse BAFFR (9B9) was purchased from AdipoGen Life Sciences. Streptavidin (SA)-PE, -BV421, and -BUV395 were purchased from BD Biosciences. Purified antimouse CD16/32 (2.4G2) and HyHEL9 mAbs were sourced from the University of California, San Francisco Hybridoma Core, and the latter was conjugated to Alexa Fluor 647 using the Alexa Fluor 647 Protein Labeling Kit (Invitrogen) according to the manufacturer’s instructions. Purified anti-CD38 was conjugated to Pacific Orange Antibody Labeling Kit (Invitrogen) according to the manufacturer’s instructions. Staining for BrdU incorporation was performed using the FITC BrdU Flow kit (BD Biosciences) according to the manufacturer’s instructions.
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5

Comprehensive Immune Cell Profiling

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Single cells were resuspended in PBS, 2% FBS, and stained with fluorochrome-conjugated or biotinylated antibodies against B220 (RA3-6B2), IgD (11-26c-2a), IgM (R6-60.2), CD1d (K253), CD24 (M1/69), CD4 (GK1.5), CD8 (53-6.7), CD11c (HL3), CD11b (M1/70), CD19 (1D3), Notch-2 (16F11), CD93 (AA4.1), BP-1 (6C3), CD21/35 (4E3), CD23 (B3B4), CD43 (S7), and ADAM10 (all from Biolegend, BD Pharmingen, Thermo Fisher Scientific or R&D Systems). Biotin-labeled antibodies were visualized with fluorochrome-conjugated streptavidin (Thermo Fisher Scientific). LIVE/DEAD® Fixable Aqua Dead Cell Stain Kit (Thermo Fisher Scientific) was used in all experiments to exclude dead cells. Compensation was performed using CompBeads (BD Biosciences) and ArC™ Amine Reactive Compensation Bead individually stained with each fluorochrome. Compensation matrices were calculated with FACSdiva software. Data acquisitions were done on FACSCanto II (BD) flow cytometer and analyzed with FlowJo software version 9 (Treestar).
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6

Single-cell Flow Cytometry Analysis of Immune Cell Subsets

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A single-cell suspension was prepared using the Tumor Dissociation Kit according to the manufacturer's protocol (Miltenyi Biotec, Bergisch Gladbach, Germany). Cells were further treated by Ammonium-Chloride-Potassium (ACK) Lysing Buffer, and lysates were analyzed by the FACSCanto II (BD Bioscience, USA).
Antibodies used in FACS analysis were as follows: B220 (RA3-6B2), TCRβ (H57-597), CD21/CD35 (7E9), and CD23 (B3B4) from Biolegend; IgM (R6-60.2) from BD Biosciences. Single-cell suspensions from the bone marrow and the spleen were blocked with 10 µg/ml of anti-mouse CD16/CD32 (2.4G2; BD Biosciences) and then stained with fluorochrome-conjugated antibodies along with 7-aminoactinomycin D (7-AAD; Sigma) to exclude dead cells. Data were acquired on a FACSCanto II (BD Biosciences) and analyzed with BD FACSDiva software (BD Biosciences).
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