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2 protocols using cd19 car detection reagent biotin

1

Characterization of CAR T-cells and PD1-VHH

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The antibodies against the following markers were used in this study (all anti-human): CD3 APC/Cy7 (Biolegend), CD19 PE (Biolegend), PD-1 (CD279) PE (BD Biosciences) and FITC (Biolegend), PD-L1 (CD274) APC (Biolegend), CD45RA PE (Biolegend), CD62L APC (Biolegend), TIGIT PE/Cy7 (Biolegend). The CAR molecules were detected by staining with CD19 CAR Detection Reagent (Biotin) (Miltenyi Biotec), or FITC-Labeled Human CD19 (Acro Biosystems), for primary staining and streptavidin-APC/Cy7 or FITC (Abcam) for visualization. The PD1-VHH-Fc-PDGFR molecules were detected using goat cross-absorbed anti-human IgG antibody conjugated with DyLight650 (Thermo Fisher Scientific). Flow cytometric analysis was performed using NovoCyte 2060 (ACEA Biosciences) instrument, data were analyzed with FlowJo X10 (FlowJo) and NovoExpress Software (ACEA Biosciences). Jurkat-Lucia™ NFAT and Nalm-6 were transduced with the pLV2 PD-1 and pLV2 PD-L1 lentiviruses, respectively, and positive cells were sorted using SH800 (Sony) instrument.
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2

Multiparameter Flow Cytometry Analysis

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The following fluorophore-conjugated mAbs were used: antihuman CD33 APC (Biolegend), anti-human CD123 PE (Biolegend), anti-human CD19 PE (Biolegend), anti-human IL13Ra2 FITC (R&D Systems), anti-human HER2 APC (R&D Systems), anti-human CD8-PE-Cy7 (BD Biosciences), anti-human CD4-APC-Cy7, anti-human CD107a-PE (BD Biosciences). The CAR molecules were detected by staining with CD19 CAR Detection Reagent (Biotin) (Miltenyi Biotec), FITC-Labeled Human CD19 (Acro Biosystems), goat anti-human IgG antibody conjugated with DyLight650 (Thermo Fisher Scientific) or recombinant protein L conjugated with FITC (Acro Biosystems), and streptavidin-APC/Cy7 (Abcam). The AVs surface proteins were detected as follows: the AVs were incubated with monoclonal antibodies or isotype controls for 30 min at 4 °C. Subsequently, the AVs were washed once with 500 µL PBS and analyzed by flow cytometry. NovoCyte 2060 (ACEA Biosciences) instrument was used for flow cytometry, data were analyzed with FlowJo X10 (FlowJo) and NovoExpress Software (ACEA Biosciences). Cell lines were sorted by SH800 Cell Sorter (Sony).
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