Reversal of airway hyperresponsiveness by induction of airway mucosal CD4+CD25+ regulatory T cells.

Reversal of airway hyperresponsiveness by induction of airway mucosal CD4+CD25+ regulatory T cells.
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DOI:
10.1084/jem.20060155
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发表时间:
2006-11-27
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Holt PG
Holt PG
中科院分区:
其他
文献类型:
--
作者:
Strickland DH;Stumbles PA;Zosky GR;Subrata LS;Thomas JA;Turner DJ;Sly PD;Holt PG

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特应性哮喘的一个重要特征是T细胞驱动的晚期反应,包括短暂的支气管收缩,随后发生气道高反应性(AHR)。我们最近使用一种独特的大鼠哮喘模型表明,致敏大鼠中空气变应原诱导的气道粘膜T细胞活化反应的发生和持续时间是由气道粘膜树突状细胞(AMDC)功能成熟的动力学决定的,AMDC由与CD 4 + T辅助记忆细胞的同源相互作用介导。下面的研究将这些调查扩展到慢性空气过敏原暴露。我们证明,在致敏大鼠慢性暴露于过敏原气溶胶期间,预防随后的T细胞活化周期和由此产生的AHR是由CD 4 + CD 25 + Foxp 3 + LAG 3 + CTLA+ CD 45 RC + T细胞介导的,这些T细胞在暴露开始后24小时内出现在气道粘膜和局部淋巴结中,并抑制随后的Th介导的AMDC功能上调。这些细胞在体内和离体测定系统中都表现出有效的调节性T(T reg)细胞活性。保护性T reg活性的维持完全依赖于持续的过敏原刺激,因为暴露的中断导致T reg活性的减弱和对空气过敏原暴露的敏感性的重新出现,表现为AMDC/T细胞上调和T辅助细胞2细胞因子表达、气道嗜酸性粒细胞增多和AHR的复苏。
An important feature of atopic asthma is the T cell–driven late phase reaction involving transient bronchoconstriction followed by development of airways hyperresponsiveness (AHR). Using a unique rat asthma model we recently showed that the onset and duration of the aeroallergen-induced airway mucosal T cell activation response in sensitized rats is determined by the kinetics of functional maturation of resident airway mucosal dendritic cells (AMDCs) mediated by cognate interactions with CD4+ T helper memory cells. The study below extends these investigations to chronic aeroallergen exposure. We demonstrate that prevention of ensuing cycles of T cell activation and resultant AHR during chronic exposure of sensitized rats to allergen aerosols is mediated by CD4+CD25+Foxp3+LAG3+ CTLA+CD45RC+ T cells which appear in the airway mucosa and regional lymph nodes within 24 h of initiation of exposure, and inhibit subsequent Th-mediated upregulation of AMDC functions. These cells exhibit potent regulatory T (T reg) cell activity in both in vivo and ex vivo assay systems. The maintenance of protective T reg activity is absolutely dependent on continuing allergen stimulation, as interruption of exposure leads to waning of T reg activity and reemergence of sensitivity to aeroallergen exposure manifesting as AMDC/T cell upregulation and resurgence of T helper 2 cytokine expression, airways eosinophilia, and AHR.
CD4+ CD25+调节T细胞体内转移后气道炎症和过度反应性的分辨率取决于白介素10。
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