New insights on OX40 in the control of T cell immunity and immune tolerance in vivo.

New insights on OX40 in the control of T cell immunity and immune tolerance in vivo.
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DOI:
10.4049/jimmunol.1101373
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发表时间:
2012-01-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Li XC
Li XC
中科院分区:
其他
文献类型:
--
作者:
Xiao X;Gong W;Demirci G;Liu W;Spoerl S;Chu X;Bishop DK;Turka LA;Li XC

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OX40是一种T细胞共刺激分子,属于TNFR超家族。在缺乏免疫激活的情况下,OX40可通过Foxp3+ Tregs选择性表达,而不能通过静息的常规T细胞表达。OX40在Treg稳态和功能中的确切作用尚未完全确定。在这里,我们证明了OX40在naïve小鼠体内的作用诱导Foxp3+ treg的初始扩增,但扩增的treg抑制功能较差,并表现出衰竭的特征。我们还发现OX40能够激活treg中的Akt和Stat5通路,导致treg的短暂增殖和Foxp3表达水平的降低。这在naïve小鼠中造成了IL-2相对缺乏的状态,进一步影响Tregs。这种耗尽的Treg表型可以通过外源性IL-2来阻止,因为OX40和IL-2激动剂都能在体内进一步扩大Treg。重要的是,OX40和IL-2激动剂扩增的Tregs是有效的抑制细胞,在心脏移植模型中,它们促进异体移植物的长期存活。我们的数据揭示了OX40在促进免疫耐受中的新作用,可能具有重要的临床意义。
OX40 is a T cell costimulatory molecule that belongs to the TNFR superfamily. In the absence of immune activation, OX40 is selectively expressed by Foxp3+ Tregs, but not by resting conventional T cells. The exact role of OX40 in Treg homeostasis and function remains incompletely defined. Here, we demonstrate that OX40 engagement in vivo in naïve mice induces initial expansion of Foxp3+ Tregs, but the expanded Tregs have poor suppressive function and exhibit features of exhaustion. We also show that OX40 enables the activation of the Akt and Stat5 pathways in Tregs, resulting in transient proliferation of Tregs and reduced levels of Foxp3 expression. This creates a state of relative IL-2 deficiency in naïve mice that further impacts Tregs. This exhausted Treg phenotype can be prevented by exogenous IL-2, as both OX40 and IL-2 agonists drive further expansion of Tregs in vivo. Importantly, Tregs expanded by both OX40 and IL-2 agonists are potent suppressor cells, and in a heart transplant model, they promote long-term allograft survival. Our data uncover a novel role for OX40 in promoting immune tolerance and may have important clinical implications.
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