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6 protocols using sa bv605

1

Splenic and Germinal Center B Cell Isolation

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Splenic B cells used for HTGTS-Rep-seq were purified from unimmunized 5 to 8-wk-old mice by MACS® Microbeads according to the manufacturer’s protocol. In brief, spleens were dissected out from unimmunized mice, prepared into single-cell suspensions, and stained with anti-B220 Microbeads for 20 min at 4 °C. The splenic B cells were collected using the LS column and MACS™ Separator. GC B cells used for Rep-SHM-seq were purified from 8 to 12-wk-old mice after eOD-GT8 60mer immunization. GC B cells were sorted for the phenotype B220+ (BV711: BioLegend 103255), CD95+ (PE-Cy7: eBioscience 557653) and GL7+ (PE: BioLegend 144607). CD4-binding site-specific GC B cells for single-cell RT-PCR were further selected for the phenotype eOD-GT8 Fc+ and ∆eOD-GT8 Fc. The eOD-GT8 Fc was conjugated with Alexa Fluor 647 fluorescence (Thermo Fisher Scientific A30009). The ∆eOD-GT8 Fc was conjugated with Biotin (Thermo Fisher Scientific A30010) and then stained with SA-BV605 (BioLegend 405229).
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2

Multicolor Flow Cytometry Panel

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Flow cytometry and cell sorting were completed on a FACS CantoII or FACS Aria Fusion instrument (BD) and analyzed using FlowJo analysis software (Tree Star). Staining was performed at 4ºC in the presence of Fc block (2.4G2) in magnetic-activated cell-sorting (MACS) buffer (PBS + .5% BSA + 2mM EDTA). The following antibodies were used; from BD Biosciences: CD117 (2B8), CD135 (A2F10.1), Ly6C (AL-21), MHCI (AF6–88.5), CD4 (RM4–5), CD8α (53–6.7), CD8β (53–5.8), CD11b (M1/70), B220 (RA3–6B2), CD64 (X54–5/7.1), CD19 (1D3), CD95 (Jo2), CD3 (145–2C11), CD45 (30-F11); from Tonbo Biosciences: MHCII (M5/114.15.2), CD44 (IM7), CD45.1 (A20), CD45.2 (104), CD11c (N418); from Biolegend: SA-BV605, SA-711, CCR7 (4B12), CD103 (2E7), XCR1 (ZET), CD115 (AFS98), Ter119 (Ter-119), Ly6G (1A8), TCRβ (H57–597), CD3 (145–2C11), CD8 (53–6.7), CD4 (RMA4–5), CD44 (IM7), CD40 (1C10), CD16/32 (93); from eBiosciences: TCRVα2 (B20.1), CD45.1 (A20), CD90.1 (HIS51), CD90.2 (53–2.1), F4/80 (BM8); from Invitrogen: CD172α (P84), CD45 (30F11); from Millipore/sigma: rabbit anti-ovalbumin (AB1225).
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3

Multiparametric Profiling of T Cell Subsets

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eFluor660-anti–IL-21, Alexa Fluor 488–anti–IL-10, PerCP-Cy5.5-anti–IFN-γ, FITC-anti-CD45RA, PE-anti-ICOS, and anti-Tbet, and biotin–PD-1 were from eBioscience. Alexa Fluor 488–anti-GATA3, Alexa Fluor 647–anti-CXCR5, anti-pSTAT4, anti-pSTAT5, anti-pSTAT6, APC-anti-CD10, APC-Cy7-anti-CD4, BV605-anti-IgG, BV421-CD40L, BV711-anti–IL-2, PE-anti-pSTAT1, anti-RORγt, and Bcl-6, PE-Cy7-anti-CD25, and anti-CD27, PerCP-Cy5.5-anti-CD127, anti-pSTAT3, and anti-Tbet, SA-PerCpCy5.5, and IFN-γ were obtained from BD. Pacific Blue–anti-CD20 and SA-BV605 were purchased from BioLegend. Recombinant human IL-12 was purchased from R&D Systems. TGF-β, IL-1β, IL-6, IL-21, and IL-23 were obtained from PeproTech. PGE2 was purchased from Sigma-Aldrich. Human IL-4 and IL-10 were provided by R. de Waal Malefyt (DNAX Research Institute, Palo Alto, CA).
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4

Multi-Parameter Flow Cytometry Protocol

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eFluor660-anti-IL-21, PerCP-Cy5.5-anti-IFNγ, FITC-anti-CD45RA, biotin-PD-1 were from eBiosciences. Alexa647-anti-CXCR5 and anti-pSTAT1, APC-anti-CD10, APC-Cy7-anti-CD4, BV605-anti-IgG, PE-anti-pSTAT3 and anti-CCR6, Pe-Cy7-anti-CD25 and anti-CD27, PerCpCy5.5-anti-CD127, biotin-anti-IgA, SA-PerCpCy5.5, and recombinant IFNγ were from Becton Dickinson. BV421-anti-CXCR3, Pacific Blue-anti-CD20 and SA-BV605 were from Biolegend.
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5

UV-Mediated Peptide Exchange for MHC Multimers

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Soluble biotinylated Class-I MHC monomers containing a UV-cleavable peptide in their binding groove were produced in-house according to published protocols77 (link)
,78 (link) and stored at −80°C. The UV-dependent peptide exchange (25 μg/mL UV-monomer and 50 μg/mL peptide diluted in PBS) was performed at a wavelength of 366 nm for 1 h at 4°C. 24 h after UV-exchange, the following streptavidin-tagged fluorochromes were added at optimized ratios to the pMonomer solution: SA-PE (Invitrogen), SA-APC (Invitrogen), SA-BV421 (Biolegend), SA-BV605 (Biolegend), SA-PE-Cy7 (Biolegend), SA-PE-CF594 (BD Biosciences), SA-PE-Cy5 (BD Biosciences), SA-APC-R700 (BD Biosciences), SA-BB790-P (BD Biosciences; prototype kindly provided by Bob Balderas). To block unoccupied binding sites, D-biotin (20 μM; Avidity) was added 24 h after multimerization. Plates were stored in the dark at 4°C until use.
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6

Multicolor Flow Cytometry Panel

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Flow cytometry and cell sorting were completed on a FACS CantoII or FACS Aria Fusion instrument (BD) and analyzed using FlowJo analysis software (Tree Star). Staining was performed at 4ºC in the presence of Fc block (2.4G2) in magnetic-activated cell-sorting (MACS) buffer (PBS + .5% BSA + 2mM EDTA). The following antibodies were used; from BD Biosciences: CD117 (2B8), CD135 (A2F10.1), Ly6C (AL-21), MHCI (AF6–88.5), CD4 (RM4–5), CD8α (53–6.7), CD8β (53–5.8), CD11b (M1/70), B220 (RA3–6B2), CD64 (X54–5/7.1), CD19 (1D3), CD95 (Jo2), CD3 (145–2C11), CD45 (30-F11); from Tonbo Biosciences: MHCII (M5/114.15.2), CD44 (IM7), CD45.1 (A20), CD45.2 (104), CD11c (N418); from Biolegend: SA-BV605, SA-711, CCR7 (4B12), CD103 (2E7), XCR1 (ZET), CD115 (AFS98), Ter119 (Ter-119), Ly6G (1A8), TCRβ (H57–597), CD3 (145–2C11), CD8 (53–6.7), CD4 (RMA4–5), CD44 (IM7), CD40 (1C10), CD16/32 (93); from eBiosciences: TCRVα2 (B20.1), CD45.1 (A20), CD90.1 (HIS51), CD90.2 (53–2.1), F4/80 (BM8); from Invitrogen: CD172α (P84), CD45 (30F11); from Millipore/sigma: rabbit anti-ovalbumin (AB1225).
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