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4 protocols using igd apc

1

Comprehensive B Cell Immunophenotyping

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Flow cytometric analysis was performed on BD® LSR II Flow Cytometer (Marshallscientific, USA), and data were analyzed with FlowJo10.0 software (Treestar, Ashland, OR, USA). Anti- mouse B220-FITC (103205, Biolegend, USA), CD43-PE-Cy7 (143210, Biolegend, USA), CD24-PE (101807, Biolegend, USA), CD19-PE-Cy7 (552854, BD, USA), CD19-BV421 (115520, Biolegend, USA), CD19-PE (115508, Biolegend, USA), CD69-FITC (104506, Biolegend, USA), CD5-PE (100608, Biolegend, USA), CD86-APC (105011, Biolegend, USA), CD95-PE (152608, Biolegend, USA), BP-1-Alexa Fluor 647 (108312, Biolegend, USA), IgD-APC (405714, Biolegend, USA), IgM-PE (406507, Biolegend, USA), and corresponding isotype control antibodies were purchased from Biolegend. Antibodies were listed in Supplementary Table 3.
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2

Profiling Memory B Cells from Vaccination

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To quantify and profile memory B cells from vaccination, single‐cell suspensions were prepared from inguinal lymph nodes, as previously described.32 Cells were stained with Zombie live/dead (Biolegend, San Diego, CA, USA), FcR‐blocked (anti‐CD16/CD32, BD Bioscience, Franklin Lakes, NJ, USA) and stained with a cocktail containing anti‐mouse B220‐PECy7, CD38‐PE, IgD‐APC, CD95 (Fas)‐BV605, IgM‐FITC, IgG‐APCCy7 (all Biolegend), for 30 min on ice in FACS buffer (PBS, 1% FBS, 0.5% NaN3). Cells were finally fixed with 100 µL of 4% PFA for 20 min on ice. B memory cells were defined as B220+ CD38+/− Faslow IgD IgM+ or IgG+. Samples were acquired by flow cytometry on a FACS Attune (Invitrogen) and analysed with FlowJo software (BD). Representative FACS plots are shown in Supplementary figure 2a.
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Isolation and Characterization of Murine Bone Marrow B Cells

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Bone marrow was obtained from the mouse tibia and femur as previously demonstrated [12 (link)]. Briefly, each degloved leg was cleaned with a razor to remove all muscle tissue. The bone marrow was flushed with 10 mL RPMI 1640 1× media (Mediatech) supplemented with 5% heat-inactivated defined fetal bovine serum (FBS) (Hyclone), 2 mM L-glutamine, and 1% penicillin/streptomycin and placed into 20 mL of the same media. Once the bone marrow was filtered and the red blood cells lysed, 0.5 × 106 cells were transferred to each well of a 96 well plate. The bone marrow was stained for 10 minutes on ice with FcR Block (Miltenyi Biotec) followed by 20 minutes with an antibody cocktail containing B220-FITC (Miltenyi Biotec), CD19-PerCP/Cy5.5 (Biolegend), IgM-PE (Southern Biotech), IgD-APC (Biolegend) and CD21-APC/Cy7 (Biolegend) in 1× PBS supplemented with 0.1% BSA. Dead cells were stained with Sytox Blue (Invitrogen).
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4

Splenic B Cell Subset Isolation

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Spleens were mechanically disrupted and red blood cells were osmotically lysed to generate a single cell suspension [13 (link)]. B220+ B cells were purified from splenocytes with a negative selection microbead kit obtained from Miltenyi Biotec. 0.5 × 106 splenic B cells were transferred to a 96 well plate and stained for 20 minutes on ice with a combination of B220-FITC (Miltenyi Biotec), IgM-PE (Southern Biotech), IgD-APC (Biolegend), CD19-PerCP/Cy5.5 (Biolegend), CD40-PerCP/Cy5.5 (Biolegend), CD21-APC/Cy7 (Biolegend), and MHC class II-PE (Bio X Cell) in 1× PBS supplemented with 0.1% BSA. The splenic B cell subsets analyzed were IgM+IgDloCD21lo, IgM+IgDhiCD21lo, IgM+IgDhiCD21hi, and IgM+IgDloCD21hi [12 (link), 19 (link)].
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