Selective elimination of autoreactive T cells in vivo by the regulatory T cells.

Selective elimination of autoreactive T cells in vivo by the regulatory T cells.
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DOI:
10.1016/j.clim.2008.08.014
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发表时间:
2009-01
期刊:
Clinical immunology (Orlando, Fla.)
影响因子:
--
通讯作者:
Liu Y
Liu Y
中科院分区:
其他
文献类型:
--
作者:
Chang X;Zheng P;Liu Y

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调节性T细胞(Treg)如何控制自身反应性T细胞尚未在具有正常T细胞库的动物中进行分析。使用内源性病毒超抗原(VSAg)作为主要的自身抗原和FoxP3的Scurfy突变的小鼠,我们在这里表明,Treg缺陷导致自身反应性T细胞的优先积累。有趣的是,在Scurfy小鼠中,VSAg反应性T细胞的增殖并不比非VSAg反应性T细胞的增殖更活跃,这表明优先积累不是由于优先增殖。相反,VSAg反应性T细胞在WT宿主中消失,尽管它们优先增殖。重要的是,当过继转移到新生的Scurfy小鼠中时,Treg选择性地杀死自身反应性T细胞,而不影响它们的增殖。选择性消除是由于自身反应性T细胞对Treg介导的杀伤的易感性增加。
How regulatory T cells (Treg) control autoreactive T cells has not been analyzed in animals with a normal T cell repertoire. Using endogenous viral superantigens (VSAg) as the primary self antigens and mice with the Scurfy mutation of FoxP3, we show here that the Treg defect causes preferential accumulation of autoreactive T cells. Interestingly, in the Scurfy mice, the proliferation of VSAg-reactive T cells was no more vigorous than that of non-VSAg-reactive T cells, which indicated that the preferential accumulation is not due to preferential proliferation. In contrast, VSAg-reactive T cells disappears in WT host despite their preferential proliferation. Importantly, when adoptively transferred into the newborn Scurfy mice, the Treg selectively kill autoreactive T cells without affecting their proliferation. The selective elimination is due to increased susceptibility of autoreactive T cells to Treg-mediated killing.
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