IFN-gamma triggered STAT1-PKB/AKT signalling pathway influences the function of alloantigen reactive regulatory T cells.

IFN-gamma triggered STAT1-PKB/AKT signalling pathway influences the function of alloantigen reactive regulatory T cells.
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DOI:
10.1111/j.1600-6143.2009.02858.x
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发表时间:
2010-01
期刊:
American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons
影响因子:
--
通讯作者:
Wood KJ
Wood KJ
中科院分区:
其他
文献类型:
--
作者:
Wei B;Baker S;Wieckiewicz J;Wood KJ

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CD4+CD25+Foxp3+调节性T细胞(Treg)在诱导和维持外周耐受中发挥关键作用。体内对同种抗原耐受的小鼠体内的 Tregs 快速、瞬时产生 IFN-γ 已被证明对其调节功能至关重要。这种 IFN-γ 有可能影响与 Tregs 相同的局部微环境中存在的细胞的功能,包括 Tregs 本身。在这里,我们研究了 Tregs 产生的 IFN-γ 触发同种抗原反应性 Tregs 本身信号通路从而影响其体内功能的机制。我们发现,同种异体抗原反应性 Tregs 中 IFN-γ 的产生和 STAT1 的激活增加,而 STAT1 依赖性 PKB/AKT 的激活下调。此外,STAT1 的激活在 IFN-γ 受体缺陷以及 IFN-γ 缺陷的 Tregs 中被阻断,表明同种抗原反应性 Tregs 产生的 IFN-γ 可能以自分泌方式诱导 STAT1 激活。重要的是,STAT1 缺陷的 Tregs 无法控制体内同种异体移植排斥反应。总的来说,这些发现表明 IFN-γ 诱导的 STAT1-PKB/AKT 信号通路在上调同种异体抗原反应性 Tregs 控制体内移植物排斥的能力方面发挥着关键作用。
CD4+CD25+Foxp3+ regulatory T cells (Tregs) play a key role in the induction and maintenance of peripheral tolerance. Rapid and transient production of IFN-γ by Tregs from mice tolerized to alloantigen in vivo has been shown to be critical for their regulatory function. This IFN-γ has the potential to affect the function of cells present in the same local microenvironment as the Tregs, including the Tregs themselves. Here we investigated the mechanism by which IFN-γ produced by Tregs triggered signaling pathways in alloantigen reactive Tregs themselves thereby influencing their function in vivo. We show that IFN-γ production and STAT1 activation was increased, while STAT1-dependent PKB/AKT activation was downregulated in alloantigen reactive Tregs. Further, the activation of STAT1 was blocked in IFN-γ receptor deficient as well as IFN-γ–deficient Tregs, suggesting that IFN-γ produced by the alloantigen reactive Tregs might act in an autocrine manner to induce STAT1 activation. Importantly, STAT1-deficient Tregs failed to control allograft rejection in vivo. Overall, these findings suggest that the IFN-γ–induced STAT1-PKB/AKT signaling pathway plays a key role in upregulating the ability of alloantigen reactive Tregs to control graft rejection in vivo.
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