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:
影响因子:
--
通讯作者:
Wood KJ
中科院分区:
文献类型:
--
作者:
Wei B;Baker S;Wieckiewicz J;Wood KJ
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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