T cell responses to mycobacterial catalase-peroxidase profile a pathogenic antigen in systemic sarcoidosis.

T cell responses to mycobacterial catalase-peroxidase profile a pathogenic antigen in systemic sarcoidosis.
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DOI:
10.4049/jimmunol.181.12.8784
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发表时间:
2008-12-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Moller DR
Moller DR
中科院分区:
其他
文献类型:
--
作者:
Chen ES;Wahlström J;Song Z;Willett MH;Wikén M;Yung RC;West EE;McDyer JF;Zhang Y;Eklund A;Grunewald J;Moller DR

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结节病是一种全身性肉芽肿性疾病,与局部上皮样肉芽肿、CD 4 + T细胞和Th 1细胞因子相关。驱动肉芽肿性炎症的组织抗原尚不确定。在这项研究中,我们使用IFN-γ-ELISPOT检测和流式细胞术来评估来自两个中心的结节病患者的肺和血液T细胞对候选致病性Ag,结核分枝杆菌过氧化氢酶-过氧化物酶(mKatG)的反应。尽管患者的表型、遗传和预后特征存在差异,但我们报告称,在这些队列中,对mKatG的T细胞反应非常相似,与非结核致敏的健康对照组相比,结节病患者血液中mKatG反应性、IFN-γ表达性T细胞的频率更高,并且(在一个子集中)比对纯化蛋白衍生物反应性T细胞的数量更多。在结节病中,mKatG-反应性CD 4 + Th 1细胞优先在肺中积聚,表明了区室化反应。患有或不患有Löfgren综合征的患者具有相似的mKatG特异性IFN-γ表达血液T细胞频率。在慢性活动性结节病中发现了循环mKatG反应性T细胞,但在非活动性疾病患者中没有发现。总之,这些结果表明,结节病中对mKatG的T细胞应答符合致病性Ag的预期特征,支持针对该疾病的免疫学方法。
Sarcoidosis is a systemic granulomatous disease associated with local epithelioid granulomas, CD4+ T cells, and Th1 cytokines. The tissue Ags that drive this granulomatous inflammation are uncertain. In this study, we used IFN-γ-ELISPOT assays and flow cytometry to assess lung and blood T cell responses to the candidate pathogenic Ag, Mycobacterium tuberculosis catalase-perox-idase (mKatG) in patients with sarcoidosis from two centers. Despite differences in patient phenotypic, genetic, and prognostic characteristics, we report that T cell responses to mKatG were remarkably similar in these cohorts, with higher frequencies of mKatG-reactive, IFN-γ-expressing T cells in the blood of sarcoidosis patients compared with nontuberculosis sensitized healthy controls, and (in a subset) in greater numbers than T cells reactive to purified protein derivative. In sarcoidosis, mKatG-reactive CD4+ Th1 cells preferentially accumulated in the lung, indicating a compartmentalized response. Patients with or without Löfgren syndrome had similar frequencies of mKatG specific IFN-γ-expressing blood T cells. Circulating mKatG-reactive T cells were found in chronic active sarcoidosis but not in patients with inactive disease. Together, these results demonstrate that T cell responses to mKatG in sarcoidosis fit a profile expected for a pathogenic Ag, supporting an immunotherapeutic approach to this disease.
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