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3 protocols using αcd3 145 2c11

1

T Cell Activation and Lineage Polarization

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Purified T cells were stimulated with plate-bound 5 µg/ml αCD3 (145-2C11; BioLegend) and 5 µg/ml αCD28 (37.51; Tonbo), polarized to the indicated lineages, and harvested at the designated time points. Cells were washed twice with PBS and lysed with RIPA buffer. Protein concentrations were quantified using the Bradford Assay, and equal amounts of protein were resolved on 4–12% Bis-Tris Plus gels (Thermo Fisher Scientific), transferred to PVDF membrane (EMD Millipore), and blotted for BCAP (1 µg/ml; 501813; R&D Systems) or H3 histone (1:3,000; Cell Signaling). Blots were then probed with appropriate secondary antibodies conjugated to fluorophores (IRDye 800CW goat anti–mouse, IRDye 680RD goat anti–rabbit), and membranes were imaged using LI-COR Odyssey CLx.
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2

T Cell Lineage Specification Protocols

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For polarizations using plate-bound αCD3 + αCD28, tissue culture plates were coated with 5 µg/ml αCD3 (145-2C11; BioLegend) and 5 µg/ml αCD28 (37.51; Tonbo), incubated at 37°C for 4 h, and washed three times immediately before use. For differentiation to Th17 cells, naive CD4+CD62LhighCD44low T cells were incubated with IL-6 (20 ng/ml; Peprotech), hTGF-β (5 ng/ml; Peprotech), αIL-4 (10 µg/ml; 11B11; BioLegend), and αIFN-γ (10 µg/ml; XMG1.2; BioLegend), with or without IL-1β (2–10 ng/ml; Peprotech). For differentiation to Th1 cells, naive CD4+CD62LhighCD44low T cells were incubated with IL-12 (10 ng/ml; Peprotech), IL-2 (50 U/ml; eBioscience), and αIL-4 (10 µg/ml; 11B11; BioLegend), with or without IL-18 (0.3–3 ng/ml; Gibco). Th2 cell differentiation was achieved by incubating naive CD4+CD62LhighCD44low T cells with IL-4 (4 ng/ml; Peprotech), IL-2 (50 U/ml; eBioscience), and αIFN-γ (10 µg/ml; XMG1.2; BioLegend).
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3

Isolation and Activation of Murine T-cells and Dendritic Cells

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Total leukocytes were isolated from LN and spleen from 8 to 12 week old mice as previously described [85 (link)]. CD4+ T-cells were isolated from the pooled cell suspensions using an EasySep™ Mouse CD4+ T Cell Isolation Kit from Stemcell Technologies (Vancouver, Canada) following the manufacturer’s instructions. Foxp3+ Treg induction protocols were as previously described [52 (link)]. Polyclonal T-cell activation was performed as previously described [87 (link)], pre-coating plates with 10 μg/ml αCD3 (145–2C11, Biolegend) in PBS overnight at 4°C. Coated plates were washed and cells were plated with 1 μg/ml soluble αCD28 antibody (37.51, Biolegend). Bone marrow-derived dendritic cells (BMDC) were generated as previously described [86 (link)]. DCs were activated overnight with 1 ug/ml LPS (Sigma) along with OVA peptide 323–339 (Invivogen) for antigen specific activation. For polyclonal activation via APC, BMDC Fc receptors were pre-loaded with 2.5 ug/ml αCD23 (Biolegend) and .5 ug/ml αCD28 (Biolegend) for two hours before culturing with target CD4+ T-cells. Antigen processing assays were performed according to manufacturer’s protocol for DQ-OVA (Thermo Fisher Scientific). A phagocytosis assay using these cells in conjunction with pHrodo-labelled particles was performed as previously described [86 (link)].
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