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Long X, Cheng Q, Liang H, Zhao J, Wang J, Wang W, Tomlinson S, Chen L, Atkinson C, Zhang B, Chen X, Zhu P. Memory CD4 + T cells are suppressed by CD8 + regulatory T cells in vitro and in vivo. Am J Transl Res 2017; 9:63-78. [PMID: 28123634 PMCID: PMC5250704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Accepted: 12/29/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Acute graft rejection mediated by alloreactive memory CD4+ T cells is a major obstacle to transplantation tolerance. It has been reported that CD8+ T regulatory cells (Tregs) have the ability to induce graft tolerance by restraining the function of activated CD4+ T cells, but not including memory T cells. The aim of this study is to elucidate the effect of CD8+ Tregs on alloreactive memory CD4+ T cells. METHODS We detected Qa-1 expression and performed proliferative assay on memory CD4+ T cells. All memory CD4+ T cells were purified from mice receiving skin allografts. We performed inhibitory and cytotoxic assays on CD8+ Tregs, which were isolated from a T cell vaccination mouse model, and IL-2, IL-4, IL-10 and IFN-γ levels were measured in co-culture supernatants by ELISA. To confirm CD8+ Tregs inhibition of memory CD4+ T cells in-vivo, we utilized a murine model of cardiac allograft transplantation. RESULTS Memory CD4+ T cells mediated acute allograft rejection, and CD8+ Tregs suppressed the proliferation of memory CD4+ T cells. In vitro, memory CD4+ T cells were inhibited and lysed by CD8+ Tregs. There was a positive correlation between IFN-γ levels, and cell lysis rate induced by CD8+ Tregs. In-vivo studies demonstrated CD8+ Tregs prolonged graft survival times, by inhibiting CD4+ memory T cells, through a Qa-1-peptide-TCR pathway. CONCLUSIONS CD8+ Tregs inhibit CD4+ memory T cell-mediated acute murine cardiac allograft rejection, and further prolong graft survival times. These results provide new insights into immune regulation of organ rejection.
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Affiliation(s)
- Xin Long
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Qi Cheng
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Huifang Liang
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Jianping Zhao
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Jian Wang
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Wei Wang
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Stephen Tomlinson
- Department of Microbiology and Immunology, Medical University of South CarolinaCharleston, SC 29466, USA
| | - Lin Chen
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Carl Atkinson
- Department of Microbiology and Immunology, Medical University of South CarolinaCharleston, SC 29466, USA
| | - Bixiang Zhang
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Xiaoping Chen
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
| | - Peng Zhu
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and TechnologyWuhan 430030, China
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Lee JJ, Ryu JS, Jeong HJ, Kim MK, Wee WR. In VitroImmunomodulatory Effects of Human Corneal Stromal Cells on Human Th17 Cells. Ocul Immunol Inflamm 2014; 23:194-204. [DOI: 10.3109/09273948.2014.891754] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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