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:
影响因子:
--
通讯作者:
Li XC
中科院分区:
文献类型:
--
作者:
Xiao X;Gong W;Demirci G;Liu W;Spoerl S;Chu X;Bishop DK;Turka LA;Li XC
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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DOI:
10.4049/jimmunol.181.4.2855
发表时间:
2008-08-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
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通讯作者:
Riley JL
影响因子:
64.8
作者:
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通讯作者:
Kuchroo, VK
影响因子:
15.3
作者:
Piconese, Silvia;Valzasina, Barbara;Colombo, Mario P.
通讯作者:
Colombo, Mario P.
DOI:
10.1084/jem.20082205
发表时间:
2009-05-11
期刊:
The Journal of experimental medicine
影响因子:
--
作者:
Hirschhorn-Cymerman D;Rizzuto GA;Merghoub T;Cohen AD;Avogadri F;Lesokhin AM;Weinberg AD;Wolchok JD;Houghton AN
通讯作者:
Houghton AN
DOI:
10.4049/jimmunol.182.1.379
发表时间:
2009-01-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
Burrell BE;Lu G;Li XC;Bishop DK
通讯作者:
Bishop DK