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5 protocols using 41bb percpef710

1

Evaluating SSX2-p103 APL Immunogenicity

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6 week-old HHDII-DR1 mice were immunized subcutaneously with 100 µg of an individual SSX2-p103 APL in complete Freund’s adjuvant (Sigma, F5881). Mice were euthanized seven days later and spleens were processed and analyzed via flow cytometry as described above. For these studies, the following antibodies were used: SSX2-p103 HLA-A2 tetramer-APC (NIH Tetramer Core Facility), CD3-FITC (BD 555274), CD4-BUV395 (BD 563790), CD8-BUV805 (BD 564920), PD1-PECF594 (BD 562523), 41BB-PerCPeF710 (eBioscience 46-1371-82), Live/Dead Ghost dye 780 (Tonbo 13-0865-T100) or corresponding fluorescently labeled IgG controls. Examples of flow gating are shown in Supplementary Figs. S1–S6.
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2

Adoptive Transfer of OT-1 T Cells

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For adoptive transfer of OT-1 T cells into B6 mice, OT-1 splenocytes were harvested as described above. CD8 T cells were isolated using immunomagnetic negative selection (StemCell, Vancouver, Canada; 19853), rinsed and suspended in PBS, and 2 × 106 cells were adoptively transferred into 6–10 wk old, female, B6 mice via intraperitoneal injection. The day following transfer, mice were immunized subcutaneously with an individual SIINFEKL APL (100 µg) in complete Freund’s adjuvant (Sigma, F5881) or vehicle. Mice were euthanized at the times indicated, spleens were collected, processed as described above, and analyzed via flow cytometry using the following antibodies: SIINFEKL H2Kb tetramer-BV421 (NIH Tetramer Core Facility), CD3-FITC (BD 555274), CD4-BUV395 (BD 563790), CD8-BUV805 (BD 564920), LAG3-BV711 (BD 563179), PD1-PECF594 (BD 562523), TIM3-APC (eBioscience 17-5871-82), 41BB-PerCPeF710 (eBioscience 46-1371-82), CTLA4-PE (eBioscience 12-1529-42), CD44-BV786 (BD 563736) and Live/Dead Ghost dye 780 (Tonbo 13-0865-T100) or corresponding fluorescently labeled IgG controls.
Data collected on different days was normalized using rainbow beads (Spherotech, Lake Forest, IL; RFP-30-5A).
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3

Splenocyte Activation and Phenotyping

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Splenocytes were cultured at 2 × 106/mL in RPMI 1640 + l-glutamine, 10% FCS, penicillin/streptomycin (200 U/mL), 1% NaPyr, 1% HEPES, 50 µM β-MeOH, and the designated peptide (2 µg/mL). At the time points indicated, cells were stained with the following antibodies: CD3-FITC (BD 555274), CD4-BUV395 (BD 563790), CD8-BUV805 (BD 564920), LAG3-BV711 (BD 563179), PD1-PECF594 (BD 562523), TIM3-APC (eBioscience 17-5871-82), 41BB-PerCPeF710 (eBioscience 46-1371-82), CTLA4-PE (eBioscience 12-1529-42), Live/Dead Ghost dye 780 (Tonbo 13-0865-T100), or corresponding fluorescently labeled IgG controls. Cells were then fixed for 15 min at 4°C in cytofix (BD Biosciences, San Jose, CA; 554655), and frozen in FCS + 10% DMSO. After all time points were collected, cells from all times were thawed, rinsed and resuspended in PBS + 3% FCS + 1 mM EDTA and analyzed by flow cytometry. All antibodies used were at 1:100 dilutions and stained for 30 min at 4°C in a 1:4 dilution of brilliant stain buffer (BD 563794) in PBS + 3% FCS + 1 mM EDTA.
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CD8+ T Cell Activation Assay

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B cells or dendritic cells (DCs) were enriched from splenocytes of OT-1 or B6 mice inoculated with Flt3 ligand-expressing B16 tumor cells25 (link) using PE-labeled antibodies specific for either CD19 or CD11c (StemCell, Seattle, WA, Cat.# 17,684) as previously described.26 (link) Similarly, CD8 + T cells were isolated using a negative selection CD8 + T-cell isolation kit (StemCell, Cat. # 19,853). After enrichment, each APC subset, and a subset of purified T cells, were cultured as described above with 2 µg/mL SIINFELK or the HLA-A2 sequence from SSX2 (RLQGISPKI) as a nonspecific control peptide. Naïve OT-1 T cells were added to each cell type at a 1:1 ratio and incubated for three days, after which cells were stained and analyzed by flow cytometry with the following panel: CD3-FITC (BD 555,274), CD4-BUV395 (BD 563,790), CD8-BUV805 (BD 564,920), LAG-3-BV711 (BD 563,179), PD1-PECF594 (BD 562,523), TIM3–APC (eBioscience 17-5871-82), CTLA4–PECy7 (Tonbo 60-1522-U100), 41BB–PerCPeF710 (eBioscience 46–1371–82), and Live/Dead Ghost dye 780 (Tonbo, San Diego, CA 13–0865–T100).
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5

Phenotyping Antigen-Specific CD8 T Cells

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Splenocytes were collected from naive OT-1 or immunized HHDII-DR1 mice as described above, cultured with 2 µg/mL (unless otherwise indicated) native SSX2-p103, SIINFEKL APL, a non-specific peptide (negative control), or phorbol 12-myristate 13-acetate (40 ng/mL, PMA, Sigma-Aldrich, St. Louis, MO; P8139) and ionomycin (2.6 µg/mL, Fisher Scientific, Waltham, MA; ICN15507001) as a positive control. After two hours golgistop (0.67µL/mL, BD 554724) was added. Cells were incubated for six additional hours (8 hours total), after which intracellular cytokine staining was performed as per the manufacturer’s protocol (Cytofix/Cytoperm Kit, BD 554714). Antibodies used for cells surface staining were: CD3-FITC (BD 555274), CD4-BUV395 (BD 563790), CD8-BUV805 (BD 564920), LAG3-BV711(BD 563179), PD1-PECF594 (BD 562523), 41BB-PerCPeF710 (eBioscience 46-1371-82). Antibodies used for intracellular staining were: TNFα-PECy7 (BD 557644), IL2-APC (eBioscience 17-7021-82), IFNγ-PE (BD 554412), and Live/Dead Ghost dye 780 (Tonbo 13-0865-T100) or corresponding fluorescently labeled IgG controls. The number of antigen-specific Th1 cells (expressing IL2 and/or TNFα and/or IFNγ) was determined as a percentage of total CD8 T cells via an “OR” Boolean gate (FlowJo software v10.1).
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