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3 protocols using cd8 buv395 rpa t8

1

Quantifying Cell Surface Antigens by Flow Cytometry

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Samples were processed into single cell suspensions and stained in FACS buffer (PBS + 2% FBS + 0.1% sodium Azide) with antibody for 45 minutes on ice followed by secondary (APC- or PE-conjugated streptavidin) binding for 20 minutes. Antibodies used were CD8-BUV395 (RPA-T8, BD Biosciences), CD4-Bv605 (RPA-T4, BD Biosciences), CD3-APC (SP34–2, BD Biosciences), FGFR4-PE (4FR6D3, BioLegend), CD19-PE (HIB19, Biolegend), PDL1-APC (MIH1, BD Bioscience), and PDL2-Bv421 (MIH18, BD Biosciences). Surface CAR was detected using biotinylated CD19 with Fc-tag (Acro Bio) or biotinylated FGFR4-Fc (Sino Bio). For evaluation of FGFR4 binders identified from phage screening, 500 nmol/L VH or Fab proteins were incubated with cells at 4°C for 30 minutes followed by PE-conjugated anti-human Fc antibody (Miltenyi Biotec, 130–101–576) for 30 minutes at 4°C. Cells were then analyzed by flow cytometry using BD LSR II. Tumor cell surface antigen was quantified using Quanti-Brite beads (BD Biosciences) according to the manufacturer's instructions. Quantibrite beads and corresponding tumor cells stained for FGFR4 antigen were acquired on a BD LSRII and analyzed using GraphPad Prism. Data were analyzed by FlowJo V10.
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2

Quantification of Cell Surface Antigens

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Samples were processed into single cell suspensions and stained in FACS buffer (PBS + 2% FBS + 0.1% sodium Azide) with antibody for 45 minutes on ice followed by secondary (APC- or PE-conjugated streptavidin) binding for 20 minutes. Antibodies used were CD8-BUV395 (RPA-T8, BD Biosciences), CD4-Bv605 (RPA-T4, BD Biosciences), CD3-APC (SP34–2, BD Biosciences), FGFR4-PE (4FR6D3, Biolegend), CD19-PE (HIB19, Biolegend), PDL1-APC (MIH1, BD Bioscience), PDL2-Bv421 (MIH18, BD Biosciences). Surface CAR was detected using biotinylated CD19 with Fc-tag (Acro Bio) or biotinylated FGFR4-Fc (Sino Bio). For evaluation of FGFR4 binders identified from phage screening, 500 nM VH or Fab proteins were incubated with cells at 4 °C for 30 minutes followed by PE conjugated anti-human Fc antibody (Miltenyi Biotec, 130–101-576) for 30 minutes at 4 °C. Cells were then analyzed by flow cytometry using BD LSR II (San Jose, CA). Tumor cell surface antigen was quantified using Quanti-Brite beads (BD Biosciences) according to the manufacturer’s instructions. Quantibrite beads and corresponding tumor cells stained for FGFR4 antigen were acquired on a BD LSRII and analysed using Graphpad Prism. Data were analyzed by FlowJo V10.
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3

Multiparametric flow cytometry analysis of cytotoxic lymphocyte subsets

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Mixed cell suspensions were stained for surface markers with combinations of the following antibodies: CD45-AF700 (HI30, Cat # 304024, BioLegend), CD3-APC/Cy7 (OKT3, Cat # 317342, BioLegend), CD103-BV711 (Ber-ACT8, Cat # 350222, BioLegend), CD4-PE/Cy5.5 (RM4–5, Cat # 350042, eBioscience, San Diego, CA), CD8-BUV395 (RPA-T8, Cat # 563795, BD Biosciences). Following surface staining, cells were fixed and permeabilized with Cytofix/cytoperm kit (BD Biosciences) according to instructions to detect perforin, granzyme A and B cells. Intracellular staining of perforin, granzyme A and B was done using combinations of the following antibodies: anti-human Perforin-PE/Dazzle 594 (dG9, Cat # 308132, BioLegend), Granzyme A-AF647 (CB9, Cat # 507214, BioLegend) and Granzyme B-BV421 (GB11, Cat # 563389, BD Biosciences). Analysis was performed on BioRad ZE5 flow cytometers (Bio-Rad, Hercules, CA) using Everest software, and data analyzed with FlowJo software (Tree Star, Inc. Ashland, OR). Expression of intracellular markers was measured by the percentage of positive cells. The gating strategy used for the expression of intracellular perforin, granzyme A and B analysis can be found in Supplementary Fig. 4.
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