title: [Autologous regulatory T cells can suppress the proliferation of lymphoma cell line in vitro].
abstract: This study was aimed to investigate the suppressive effect of regulatory T (Treg) cells on the T cell lymphoma EL4 cell line and to explore its mechanism. C57BL/6 Mouse Treg cells were isolated by MACS (magnetic cell sorting). The purity and the expression of Foxp3 were detected by flow cytometry. The suppressive effect of sorted Treg cells on EL4 cells was detected by MTT assay. The secretion of TGF-beta1 and IL-10 was examined by enzyme-linked immunosorbent assay (ELISA). The results showed that CD4(+)CD25(+) T cells could be successfully isolated by MACS with the purity reaching 91.6% and the expression level of Foxp3 was 78.9%. The ratio of viable cells was more than 95%. Regulatory T cells could suppress the proliferation of EL4 cells effectively in the presence of antigen presenting cells (APCs). And the suppressive effect was most significant at 1:1 ratio. In addition, the suppression still existed without APCs. TGF-beta1 and IL-10 could not be detected by ELISA. It is concluded that the Treg cells can suppress T lymphoma cell in vitro. The suppressive effect of Treg cells works in dose-dependent manner, but not in cytokine-dependent manner. The mechanism of this suppression may take effect through cell-cell contact.
authors: Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Lymphoma, Beijing, China.
authors: Zhi-Tao
authors: ZT
authors: Ying
authors: Jun
authors: J
authors: Guo
authors: Jun
authors: J
authors: Ren
authors: Yan
authors: Y
authors: Kong
authors: Zhi-Hong
authors: ZH
authors: Yuan
authors: Xi-Juan
authors: XJ
authors: Liu
authors: Chen
authors: C
authors: Zhang
authors: Wen
authors: W
authors: Zheng
authors: Yu-Qin
authors: YQ
authors: Song
authors: Yun-Tao
authors: YT
authors: Zhang
authors: Jun
authors: J
authors: Zhu
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D002469:Cell Separation; D005434:Flow Cytometry; D051858:Forkhead Transcription Factors / Q000378:metabolism; D016753:Interleukin-10 / Q000378:metabolism; D008223:Lymphoma / Q000378:metabolism / Q000473:pathology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D053773:Transforming Growth Factor beta1 / Q000378:metabolism
chemical_list: D051858:Forkhead Transcription Factors; C498833:Foxp3 protein, mouse; D053773:Transforming Growth Factor beta1; D016753:Interleukin-10