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4 protocols using cd19 pe cy7 sj25c1

1

Comprehensive B Cell Immunophenotyping

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Absolute counts of blood CD4 and CD8 T cells, CD16+/56+ natural killer cells, and CD19+ B cells were obtained with a diagnostic lyse-no-wash protocol. Eight-color flow cytometric analysis was performed as described previously to detect transitional, naive mature, six memory B cell subsets, plasmablasts and CD21lowCD38dim cells (S1 Fig) on a 3-laser FACS LSRII with standardized configuration according to Euroflow protocols (BD Biosciences, San Jose, CA) [23 (link)]. Detailed analysis of B cell subsets was performed with IgM-HorV450 (G20-127; BD), IgD-biotin (IA6-2), IgG-PE (G18-145), CD19-PE-Cy7 (SJ25C1), CD19-PerCP-Cy5.5 (SJ25C1), CD21-PE-Cy7 (B-ly4), CD27-PerCP-Cy5.5 (L128), CD27-APC (L128), CD38-APC-H7 (HB7; all from BD Biosciences, San Jose, CA, USA) and IgA-FITC (IS11-8E10; Miltenyi-Biotec GmbH, Germany) [24 (link)]. Biotinylated antibodies were visualized with streptavidin-Pac.Orange (Invitrogen).
Naive mature and natural effector B cells were high-speed cell sorted to greater than 95% purity on a FACSAria I (BD Biosciences), as described previously [25 (link)].
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2

Purification and Characterization of B Cells

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A total of 100,000 purified B cells were stained with antibodies against CD14-PacB (M5E2), CD3-PacB (UCHT1) and CD19 PE-Cy7 (SJ25C1) (all from BD Biosciences, San Jose, CA, USA) for 15 minutes at 4 °C. Afterward, 4′,6-diamidino-2-phenylindole (DAPI) was added to the stained cells (dead cell staining) and analyzed by FC using a FACSCanto II flow cytometer (BD Biosciences). Data were evaluated using FlowJo software (version 7; Tree Star, Ashland, OR, USA). The total B cell (CD3CD14DAPICD19+) purity was 98.5 ± 2.2 % in almost all samples (mean ± standard deviation), with the exception of two cases with 8.2 % and 5.6 % non–B cells (CD3+ cells, CD14+ cells or cell debris). These two samples were outliers but did not show any results substantially different from the remaining samples. Additional analyses also did not show any relationship between cytokine levels in the supernatants of TNF-α, IL-6 or IL-10 and the frequency of non-B cells of these samples, including any relationship of the impact of epratuzumab and the frequency of non-B cells after purification (data not shown).
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Comprehensive Immunophenotyping of Bone Marrow

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For immunophenotyping, BM cells were treated with RBC Lysis Buffer (BioLegend, San Diego, CA, USA) and stained with the following monoclonal antibodies: anti-human CD45-Allophycocyanin (Clone: HI30), CD34-phycoerythrin (PE; 581), CD19-PEcy7 (SJ25C1; BD Biosciences, San Jose, CA, USA), hCD33-PerCPcy5.5 (P67.6), and anti-mouse CD45-Brilliant Violet 605 (30-F11; BioLegend) [24 ]. 4′,6-diamidino-2-phenylindole (DAPI) was used to identify dead cell. All flow cytometric analyses were performed with BD LSR Fortessa (BD Biosciences) and FlowJo software (Tree Star, Ashland, OR, USA). In singlet population of live cells, the percentage of human CD45+ cells was calculated as [% hCD45+/(% hCD45+ + % mCD45+) x 100] and gating for percentages of human CD34+, CD19+ and CD33+ were performed on the human CD45+ population.
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4

Longitudinal Immune Profiling in Humanized Mice

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Immunophenotyping was performed on peripheral blood samples collected longitudinally and at the study endpoint on whole blood and on mononuclear cells isolated from the tissues of humanized mice. Prior to antibody incubation, Ig-binding sites were blocked. The fluorochrome-conjugated antibodies included CD45-V500 (HI30, BD Biosciences, San Jose, USA), CD3-APC-R700 (UCHT1, BD Biosciences, San Jose, USA), CD4-APC-H7 (RPA-T4, BD Biosciences, San Jose, USA), CD8-FITC (SK1, BD Biosciences, San Jose, USA), CD19-PE-Cy7 (SJ25C1, BD Biosciences, San Jose, USA), CD27-PE (M-T271, BD Biosciences, San Jose, USA), CD38-APC (HB7, BD Biosciences, San Jose, USA), CD45RA-Pacific Blue (F8-11-13, Bio-Rad, Hercules, USA), HLA-DR-PerCP (L243, BD Biosciences, San Jose, USA), mouse IgG1k-APC (MOPC-21, BD Biosciences, San Jose, USA), mouse IgG1k- Pacific Blue (MOPC-21, BD Biosciences, San Jose, USA), mouse IgG1k-PE (MOPC-21, BD Biosciences, San Jose, USA) and mouse IgG2ak-PerCP (X39, BD Biosciences, San Jose, USA). After antibody incubation, blood samples were lysed with t 1× BD FACS lysing solution (BD Biosciences, San Jose, USA). Samples were then analyzed on a BD LSRFortessa instrument (BD Biosciences, San Jose, USA).
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