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3 protocols using fitc anti mouse cd25

1

Quantitative Analysis of Regulatory T Cells

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For evaluating the frequency of Treg cells, splenocytes were first surface stained with PE anti-mouse CD4 (Biolegend) and FITC anti-mouse CD25 (Biolegend). After permeabilization with Foxp3 buffer set (BD Biosciences), cells were incubated with PerCP/Cy5.5 anti-mouse Foxp3 for intracellular staining. Finally, Data were acquired and analyzed with FACSCalibur flow and flowJo software (Version 10).
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2

Single-cell Spleen Immune Profiling

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To acquire single-cell suspension, the mouse spleen was minced through a 40µm nylon cell strainer, and we used the Tris-NH4Cl lysis buffer (0.017 M Tris-HCl, 0.144 M NH4Cl) to deplete the red blood cells. Then the spleen cells were harvested and divided into two tubes, and 100μL blood was dripped into a tube for testing. One tube of the sample was incubated with the antibody FITC anti-mouse CD3, APC anti-mouse CD4, PerCP anti-mouse CD8, PE anti-mouse CD28, and the other tube of cells were incubated with APC anti-mouse CD4, FITC anti-mouse CD25, and PerCP anti-mouse CD19 (BioLegend) at room temperature for 30 min in the dark before being washed and resuspended in 0.5 mL of PBS and quantified by flow cytometry (BD Calibur™, USA).
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3

Murine Submandibular Lymph Node Isolation

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Submandibular lymph nodes were extracted from BALB/c mice after euthanasia. Lymph node tissues were treated with 2 mg/mL collagenase (Sigma C0130) for 1 hr at 37°C and triturated with a pipet tip. Cell suspensions were filtered through a 70 um mesh, resuspended in FACS buffer (PBS, 5% FBS, 0.05% sodium azide), and counted by hemocytometer. 106 cells from each sample were aliquoted into V-bottom 96-well plates for subsequent staining. FC-receptors were blocked using TruStain fcX (101319, Biolegend, San Diego, CA), according to the manufacturer’s protocol. The following conjugated primary antibodies from Biolegend were used for cell surface staining: APC anti-mouse CD3e (100311), FITC anti-mouse CD25 (101907), FITC anti-mouse CD45 (103107), APC anti-mouse Ly-6G/Ly-6C (108411), PE anti-mouse F4/80 (123109). The following conjugated primary antibodies from Tonbo Biosciences (San Diego, CA) were used for cell surface staining: PE anti-mouse CD4 (50-0042), APC anti-mouse CD8a (20-1886). Cells were immunolabeled, washed, and analyzed with a SH800S Cell Sorter (Sony Biotechnology Inc., San Jose, CA).
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