Levels of Foxp3 in regulatory T cells reflect their functional status in transplantation.

Levels of Foxp3 in regulatory T cells reflect their functional status in transplantation.
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DOI:
10.4049/jimmunol.182.1.148
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发表时间:
2009-01-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Dana R
Dana R
中科院分区:
其他
文献类型:
--
作者:
Chauhan SK;Saban DR;Lee HK;Dana R

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表达Foxp3的CD4+CD25+调节性T细胞(TCR4)已显示在移植的临床和动物模型中预防同种异体移植物排斥。然而,Foxp3在调节Treg功能中的作用,以及Treg在移植中诱导同种异体移植物耐受的动力学和作用机制仍然没有完全理解。因此,我们在原位角膜移植的小鼠模型中研究了Tglutamine的动力学和功能,原位角膜移植是世界上最常见的组织移植形式。在这里,使用体外功能测定和体内Treg过继转移测定,我们表明,比Treg频率更相关的是它们的Foxp3表达水平,这与TGFAP通过产生调节性细胞因子和抑制效应T细胞活化来预防同种异体移植排斥反应的潜力直接相关。此外,我们的数据清楚地表明,TdR主要抑制区域引流淋巴结中同种免疫的诱导,而不是抑制外周免疫应答的效应相。这些发现为移植中Treg动力学提供了新的见解,这对于设计调节Treg功能的治疗策略以及优化基于Treg的细胞疗法用于临床转化至关重要。
Foxp3 expressing CD4+CD25+ regulatory T cells (Tregs) have been shown to prevent allograft rejection in clinical and animal models of transplantation. However, the role of Foxp3 in regulating Treg function, and the kinetics and mechanism of action of Tregs in inducing allograft tolerance in transplantation, are still not fully understood. Thus, we investigated the kinetics and function of Tregs in a mouse model of orthotopic corneal transplantation, the most common form of tissue grafting worldwide. Here using in-vitro functional assays and in-vivo Treg adoptive transfer assays, we show that far more relevant than Treg frequency is their level of Foxp3 expression, which is directly associated with the potential of Tregs to prevent allograft rejection by producing regulatory cytokines and suppressing effector T cell activation. In addition, our data clearly demonstrate that Tregs primarily suppress the induction of alloimmunity in regional draining lymph nodes, rather than suppressing the effector phase of the immune response in the periphery. These findings provide new insights on Treg dynamics in transplantation which are crucial for designing therapeutic strategies to modulate Treg function, and to optimize Treg-based cell therapies for clinical translation.
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