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2 protocols using biotin anti mouse cd19

1

Quantification of Tumor-Derived Exosome Uptake

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8–10 week old C57BL/6 mice were injected i.v. with LLC exosomes (10μg, in 100μl PBS) every 3 days for 2 weeks. Mice were fasted for 12 hours prior to intraperitoneal injection with 18FDG. One hour after injection, the mice were euthanized, lungs were harvested and measured on a Biodex Atomlab 500 for radioactivity. Lung tissue was enzymatically digested (collagenase (5g/L), Hyaluronidase (0.4g/L), DNAse I (0.15g/L)) for 20 minutes with rotation at 37°C. Following digestion, RBC’s were lysed using ACK. Cells were stained with primary Biotin anti-mouse CD19 (Biolegend,115504), secondary Streptavidin MicroBeads (Miltenyl Biotec,130-048-101), CD8a (Ly-2) MicroBeads (Miltenyl Biotec,130-049-401), CD4 (L3T4) (Miltenyl Biotec,130-049-201) for 15 minutes. Cells were then magnetically separated on an autoMACS Pro separator (Miltenyl Biotec) using the positive selection protocol. The negative fraction was then collected and read on a Biodex Atomlab 500 for radioactivity. Cells were then resuspended in Trizol and saved in the −80°C for RT-PCR.
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2

Isolation and Activation of Regulatory T Cells

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Mice at age between 7 to 10 weeks were sacrificed and the spleens were isolated. After red blood cell lysis, cells were incubated with biotin anti-mouse CD8α (100,704, BioLegend), biotin anti-mouse I-A/I-E (107,604, BioLegend), biotin anti-mouse NK1.1 (108,704, BioLegend), biotin anti-mouse/human B220 (103,204, BioLegend), biotin anti-mouse CD49b (103,522, BioLegend), biotin anti-mouse CD19 (115,504, BioLegend), biotin anti-mouse/human CD11b (101,204, BioLegend), and biotin anti-mouse CD11c (117,304, BioLegend). Antibody-bound cells were then negatively selected by using MagnaBind™ Streptavidin (21,344, Thermo Fisher Scientific). Subsequently, Biotin anti-mouse CD25 (102,004, BioLegend) and MojoSort™ streptavidin nanobeads (480,016, BioLegend) were used for positive selection. The cells were purified by magnetic separation using LS Columns (130–042-401, Miltenyi Biotec) according to the manufacturer’s instructions.
The isolated cells were activated with plate-bound anti-CD3ε (145-2C11; 5 μg/ml) and soluble anti-CD28 (37.51; 2 μg/ml). For tTreg culture, mouse recombinant IL-2 (50 ng/ml), human recombinant TGF-β1 (5 ng/ml), XMG1.2 (10 μg/ml), and 11B11 (10 μg/ml) were added to the cell culture medium. All cytokines for differentiation were purchased from eBioscience.
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