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2 protocols using cxcr5 pe

1

Immunophenotyping of T Cell Subsets

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PBMCs were separated by a gradient centrifugation procedure on a lymphocyte separation medium (Secoll Separation Media, Mannheim, Germany). After separation, freshly isolated cells were stained with the following fluorophore-conjugated antibodies: CD4 APC-Cy7 (clone: RFT-4g), ICOS PE-Cy7 (clone: ISA-3, eBioscience, ThermoFisher), CXCR5 FITC (CD185, clone: REA303), CXCR3 APC (CD183, clone: REA232), PD-1 PE-Vio 770 (clone: PD-1.3.1.3, Miltenyi Biotec), CD45RA PE-Cy5 (clone: HI100, BioLegend), and CCR6 PE (CD196, clone: 11A9, BD Bioscience).
The freshly isolated thymocytes and the PBMCs obtained at the time of thymectomy were stained with the following fluorochrome-conjugated antibodies: CD4 FITC (clone: RPA-T4, Beckman Coulter), CD8 APC (clone: RPA-T8), CXCR3 eFluor660 (CD183, clone: CEW33D, eBioscience), CCR6 PE (CD196, clone: 11A9), PD-1 PE (CD279, clone: MIH4, BD Bioscience), ICOS PE (clone: C398.4A, BioLegend), and CXCR5 PE (CD185, clone: 51505, R&D Systems). The samples were analyzed on an Attune Flow Cytometry (Thermofisher, USA). Fluorescence minus one control, which contains all flurochromes in a panel except for the target markers measured, was used to identify and to gate the cells.
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2

Comprehensive Immune Cell Phenotyping

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PBMC (1–4×106 cells/tube) were stained with monoclonal antibodies to B cell markers (CD19-AF700, IgM-PerCP-Cy5.5, IgD-PE-Cy7 (Biolegend), CD38-FITC, CD21-PE, CD10-PE-CF594, CD40-APC, CD86-BV421 (BD Pharmingen)) and T cell markers (CD3-AF700, CD4PacBlue (Biolegend), CD8-APC-AF750 (Invitrogen), CD45RA-ECD, CD27-PE-Cy5 (Beckman Coulter), CD27-BV650, CD38-FITC, HLA-DR-PE-Cy7, PD-1-APC, CXCR5-PE (R&D Systems)) for 40 minutes at room temperature. Stained cells were subsequently washed twice and fixed in 1% paraformaldehyde for 10 minutes at 4°C. Data was acquired within 4 hours using a BD LSRII flow cytometer (BD Biosciences – Immunocytometry Systems, San Jose, CA). Data were analyzed using Flow Jo Software (Tree Star Inc., Ashland, OR) with the gating scheme as per Supplemental Figure 1.
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