J Immunol:低剂量IL-2能够激发Treg介导的食物过敏耐受

2016-06-09 佚名 生物谷

胸腺来源的调节性T细胞(Treg)占据整个CD4 T细胞群体的5%-10%。Treg的缺失会引发免疫耐受紊乱、自体免疫以及过敏反应。事实上,过敏反应也是由于FoxP3突变引起的Treg功能异常产生的多种临床表现之一。另外,过敏反应较为严重的人群体内Treg的数量与功能也处于异常状态。此外,在小鼠试验中Treg也被证明能够有效治疗由于过敏原引发的免疫扩大反应。这些证据表明Treg对于过敏反应的耐受具

胸腺来源的调节性T细胞(Treg)占据整个CD4 T细胞群体的5%-10%Treg的缺失会引发免疫耐受紊乱、自体免疫以及过敏反应。事实上,过敏反应也是由于FoxP3突变引起的Treg功能异常产生的多种临床表现之一。另外,过敏反应较为严重的人群体内Treg的数量与功能也处于异常状态。此外,在小鼠试验中Treg也被证明能够有效治疗由于过敏原引发的免疫扩大反应。这些证据表明Treg对于过敏反应的耐受具有重要的作用。

IL-2对于Treg的存活,增殖以及功能的发挥具有重要的作用。此前的研究与临床试验表明IL-2能够有效提高Treg的数量与功能,并抑制器官移植手术后的免疫排斥效应。

为了研究IL-2对于Treg以及过敏反应的作用,来自法国巴黎第一大学的Bertrand Bellier课题组进行了深入研究,相关结果发表在最近一期的《Journal of Immunology》杂志上。

首先,作者对小鼠进行了IL-2的注射处理,5天后,研究者们检测了小鼠脾脏以及肠道淋巴结中Treg的数量与功能。结果显示:经过IL-2处理的小鼠脾脏与肠道淋巴结中的Treg的数量有了明显的提升,另外,这一部分细胞的活化程度相比对照组也有了显著上升。

之后,作者对OVA敏感型小鼠进行上述的处理,5天后再给其饲喂OVA,使其产生口服过敏反应。结果显示,经过IL-2注射处理的小鼠有效避免了OVA特异性的过敏反应。此外,作者在花生过敏小鼠模型中也验证了上述结果。

为了探索这一效应是否来源于Treg。作者在上述处理的基础上通过特异性抗体阻断了Treg的活性。结果显示,这一阻断能够明显抑制IL-2注射产生的免疫耐受。

进一步,作者发现IL-2的注射能够改变小鼠体内Th1/Th2的平衡,使得Th2的免疫反应程度降低。另外,该处理还能够降低嗜酸性与嗜碱性粒细胞的聚集,从而降低过敏反应的严重程度。

最后,作者证明IL-2的注射能够针对过敏反应产生长期的有效保护作用(1一个月)。

原始出处

Benjamin Bonnet, James Vigneron, Be´atrice Levacher, Thomas Vazquez, Fabien Pitoiset, Faustine Brimaud, Guillaume Churlaud, David Klatzmann, and Bertrand Bellier.Low-Dose IL-2 Induces Regulatory T Cell–Mediated Control of Experimental Food Allergy.J immunol.2016

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    2017-05-22 changjiu

    过敏应引起重视

    0

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    2016-06-11 milkshark

    haikwyi,啊

    0

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    2016-06-11 yhy100201
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    2016-06-11 tomyang93

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