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4 protocols using igg2b isotype control

1

Murine Immune Cell Staining Protocol

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Fluorescently labeled antibodies (Abs) to CD3 (145-2C11), CD25 (PC51), CD44 (IM7), CD16/CD32 (2.4G2), CD14 (rmC5-3), CD45R/B220 (RA3-6B2), and IgG2a isotype control were purchased from BD Biosciences (San Jose, CA). Fluorescently labeled Abs to GATA3 (TWAJ) and IgG1 isotype control were purchased from eBioscience (San Diego, CA). Fluorescently labeled Annexin-V, IgG2b isotype control, and 7-AAD viability staining solution were purchased from BioLegend (San Diego, CA). Ghost Dye™ Red 780 was purchased from TONBO Biosciences (San Diego, CA). Recombinant mouse proteins, including IL-2, IL-7, IL-25, TSLP, and IFN-β were from R&D Systems (Minneapolis, MN). Mouse IL-33 and IFN-α2 were from eBioscience, and mouse IFN-γ was from PeproTech (Rocky Hill, NJ). High molecular weight poly (I:C), CpG A (ODN1585), and R848 were from InvivoGen (San Diego, CA). The culture filtrate extract of A. alternata was from Greer Laboratories (Lenoir, NC); the extract contained detectable, but minimal, amounts of endotoxin (i.e., 3 ng endotoxin/mg extract). Anti-IFNAR1 (MAR1-5A3) and isotype-matched control IgG for blocking experiments were purchased from BioXcell (West Lebanon, NH).
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2

Organoid Single-Cell Immunophenotyping

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Organoids were dissociated into single cells following the methods outlined above (see Human Organoid Passaging and Maintenance Culture in EHS Matrix and Enteroid Passaging in HELP Matrices). The cells were centrifuged for 5 min at 500 x g to pellet. The media was then removed from each pellet and the cells were resuspended in FACS buffer (PBS + 1 × 10−3m EDTA (Invitrogen) + 2% v/v FBS (Atlanta Bio) + 1% penicillin/streptomycin (Gibco)) supplemented with fluorophore‐conjugated primary antibodies (BioLegend anti‐human CD44 antibody, BioLegend IgG2B isotype control). Antibody staining was performed for 30 min at 4 °C in the dark. Following staining, the cells were washed twice using FACS buffer and resuspended in 200 µL FACS buffer with DAPI (1:10000, BioLegend) to select for live cells. Flow cytometry was performed on a Beckman Coulter CytoFlex analyzer (Stanford Stem Cell Institute FACS Core). To analyze the data, gates were determined using forward and side scatter with height and width used to identify cell doublets. Subsequently, live DAPI‐negative cells were gated for all marker analyses and population frequency calculations.
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3

Modulating PD-L1 in Islet Xenografts

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To study the role of PD-L1 on islet xenograft survival, islet recipients were given two doses of 100 μl of PBS containing anti-mouse monoclonal anti–PD-L1 antibody (BioXCell, West Lebanon, NH, USA) or IgG2b isotype control (BioLegend, San Diego, CA, USA) at 2.5 mg/kg via intraperitoneal route on days 10 and 20 after transplantation.
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4

Neutrophil Depletion for BSA-NP Study

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To deplete neutrophils, mice were treated with a 400 μg intraperitoneal injection of anti-mouse Ly6G antibody (108454, Biolegend) or IgG2b isotype control (400675, Biolegend) 24 h prior to injection of BSA-NPs. Subsequent 200 μg antibody injections were administered accompanied by BSA-NPs. Animals were euthanized after 16 h to collect peritoneal lavage fluid, ectopic lesions, and eutopic endometrium. Neutrophil depletion was confirmed by flow cytometry as described below.
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