在多发性硬化症中,HLA-DR15分子共同形成自动反应性T细胞谱
Jian Wang1, Ivan Jelcic1, Lena Mühlenbruch2
1Neuroimmunology and MS Research, Neurology Clinic, University Hospital Zurich, University of Zurich, Zurich 8091, Switzerland.
Cell
|October 22, 2020
概括
这种HLA-DR15类型是多发性硬化症 (MS) 的主要风险因素,形成自主反应性T细胞. 这项研究揭示了HLA-DR15异构体如何呈现自我和外来抗原,从而导致MS的发病.
科学领域:
- 免疫学
- 神经免疫学
- 遗传学
背景情况:
- HLA-DR15是多发性硬化症 (MS) 的主要遗传风险因素.
- HLA-DR15对多发性硬化症的致病作用的确切机制尚不完全理解.
- 自主反应的CD4+T细胞和作为抗原呈现细胞的B细胞与MS有关.
研究的目的:
- 描述HLA-DR15异形DR2a和DR2b的免疫.
- 研究HLA-DR15在MS中对自身反应性T细胞呈现自我和异性抗原中的作用.
主要方法:
- 从原始人类B细胞,单细胞,胸腺和多发性硬化脑组织中分析免疫.
- 自主反应的CD4+T细胞克隆的特征.
- 来自HLA-DR分子 (HLA-DR-SPs) 的自我的识别.
主要成果:
- 包括DR2a和DR2b在内的HLA-DR分子中的自我在B细胞和胸膜抗原呈现细胞中大量存在.
- 自主反应的CD4+T细胞克隆与HLA-DR-SP交叉反应.
- 这些T细胞克隆还识别了来自爱斯坦-巴尔病毒和阿克曼西亚菌的,以及DR2a和DR2b所呈现的自身抗原.
结论:
- 这两种HLA-DR15异形 (DR2a和DR2b) 都有助于塑造多发性硬化症患者的自身反应性T细胞谱.
- HLA-DR15既是一种抗原呈现结构,又是一种表位源.
- 通过HLA-DR15向自身反应性T细胞呈现共享的外来和自身抗原是MS发病的一个关键机制.
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