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2 protocols using cd3e antibody

1

Dextran Sulfate Sodium Induced Colitis Assay

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Dextran sulfate sodium (DSS, MW 36000-50000) was obtained from MP Biomedicals (CA, USA). The myeloperoxidase (MPO) assay kit was obtained from Jiancheng Bioengineering Institute (Nanjing, China). Zonula occludens protein 1 (ZO-1) and Occludin antibodies were obtained from Affinity (Liyang, China). FITC anti-CD4, PE anti-Foxp3, and PE anti-IL-17A antibodies were obtained from Biolegend (CA, USA). CD3e antibody, APC anti-CD25 antibody, Foxp3/transcription factor staining buffer set and IC fixation buffer were obtained from eBioscience™ (CA, USA). CD16/CD32 antibody was obtained from BD Biosciences (CA, USA). STAT3 and phospho-STAT3 (p-STAT3) antibodies were obtained from Cell Signaling Technology (MA, USA). The QuantiCyto® Mouse TNF-α enzyme-linked immunosorbent assay (ELISA) kit was obtained from NeoBioscience (Shenzhen, China).
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2

Suppressive Effects of iMDSCs on CD4+ T Cell Proliferation

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The CD3e antibody (5 μg/ml, eBioscience) was coated in 96-well plates at 100 μl per well. CD4+ T cells were isolated from normal mouse spleens using a mouse CD4+ T-cell isolation kit (Miltenyi, Germany). The sorted CD4+ T cells were stained with 1 μM 5, 6-carboxycein diacetate succinimidyl ester (CFSE, Invitrogen). Next, the CD28 antibody (5 μg/ml, eBioscience) was then added. Different ratios of CD4+ T cells (1 × 105/well) and sorted iMDSCs were co-cultured in 96-well plates for 72h. After co-culture, anti-CD4-APC and 7-AAD (eBioscience) were used to stain the cells, and the degree of CFSE decay in 7-AAD-CD4+ T cells was determined by flow cytometry. In the meantime, the proliferation index (PI) of CD4+ T cells was calculated as the ratio of the percentage of cells co-cultured with iMDSCs to cells co-cultured without iMDSCs, multiplied by 100 %.
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