期刊
CELL DEATH & DISEASE
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/cddis.2016.348
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资金
- National Natural Science Foundation of China [81130058, 81430034, 91542123, 81401336]
- National Basic Research Program of China (973 Program) [2013CB944900]
- Research Fund for the Doctoral Program of Higher Education of China [RFDP 20133402110015]
Understanding the mechanisms that lead to autoimmunity is critical for defining potential therapeutic pathways. In this regard there have been considerable efforts in investigating the interacting roles of TGF-beta and IL-2 on the function regulatory T cells. We have taken advantage of dnTGF-beta RII II2ra(-/-)(abbreviated as II2ra(-/-)Tg) mouse model, which allows a direct mechanistic approach to define the relative roles of TGF-beta and IL-2 on Treg development. II2ra(-/-)Tg mice spontaneously developed multi-organ autoimmune diseases with expansion of pathogenic T cells and enhanced germinal center response at 3-4 weeks of age. Importantly, peripheral Treg cells from II2ra(-/-)Tg mice demonstrated an activated Th1-like stable phenotype and normal in vitro suppressive function, while thymus Treg increased but manifested decreased suppressive function. Interestingly, neither thymus nor peripheral Treg cells of II2ra(-/-)Tg mice contained Neuropilin-1(+) or PD-1(hi) phenotype, resulting in defective follicular regulatory T (Tfr) cell development. Such defective Tfr development led to elevated follicular T helper cells, enhanced germinal center responses and increased plasma cell infiltration. These data demonstrate an important synergetic role of TGF-beta and IL-2 in the generation, activation and stability of Treg cells, as well as their subsequent development into Tfr cells.
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