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CD155-Transducing Signaling through TIGIT Plays an Important Role in Transmission of Tolerant State and Suppression Capacity.

Immunohorizons. 2018 Nov 16;2(10):338-348
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摘要


The precise mechanism of how the regulatory T cell population elicits and maintains tolerant state in activated T cells is poorly understood. To address this issue, we established an in vitro coculture system using mouse T cells and showed that tolerant state is serially passed from preinduced-tolerant T cells into new TCR-stimulated T cells across generations in a dendritic cell-independent manner. In this successive induction process of tolerant state, TIGIT was found to play an important role: TIGIT expression on induced-tolerant T cells was promoted in stimulated T cells cocultured with the tolerant cells. In addition, these stimulated T cells in the coculture also expressed high B lymphocyte-induced maturation protein 1 accompanied by IL-2 suppression. Because CD155, a partner of TIGIT, is known to transduce signaling inside by trans-interaction with its ligands, these phenotypical changes in TCR-stimulated naive T cells were reproduced when naive T cells were double cross-linked by CD3 and CD155. These results indicate that TIGIT enhanced on tolerant T cells may function as a ligand of its paired receptor CD155 to transduce signaling into its expressing naive T cells to accelerate new TIGIT expressions as well as IL-2 suppression via B lymphocyte-induced maturation protein 1 enhancement. In consideration of these results, we propose a novel process in which tolerant state in T cell population is maintained by successive generation of new tolerant T cells from naive T cells as one of the regulating mechanisms in immune responses.

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