自免疫相关的T细胞受体识别HLA-B*27结合
Xinbo Yang1,2, Lee I Garner3,4, Ivan V Zvyagin5,6
1Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA, USA.
人类白细胞抗原B*27 (HLA-B*27) 与炎症性疾病有关. 研究人员确定了对自我和微生物反应的T细胞受体,这表明在疾病发病过程中具有双重作用.
科学领域:
- 免疫学
- 遗传学
- 分子生物学
背景情况:
- 人类白细胞抗原B*27 (HLA-B*27) 与炎症性疾病如缩性脊髓炎 (AS) 和急性前膜炎 (AAU) 有着强烈的关联.
- HLA-B*27对疾病发病的确切机制尚不清楚.
- 一个潜在的机制涉及病原性向CD8+T细胞的呈现.
研究的目的:
- 研究T细胞受体 (TCR) 在HLA-B*27相关炎症疾病中的作用.
- 确定激活疾病相关TCR的特定.
- 在HLA-B*27的背景下阐明TCR交叉反应的结构基础.
主要方法:
- 从患有AS和AAU的患者中分离了与疾病相关的BV9-CDR3β基因的孤儿TCR.
- 对受影响组织的TCR链配对 (AV21) 和克隆扩张的分析.
- 使用HLA-B*27:05酵母显示库来选激活.
- 对TCR--MHC相互作用的结构分析.
主要成果:
- 在AS和AAU患者中发现了具有特定BV9- CDR3β动机和AV21链对的TCR,并进行了克隆扩张.
- 这些TCR是由HLA-B*27:05呈现的自我和微生物激活的.
- 结构分析显示这些具有共同的结合基因,该基因激活BV9-CDR3βTCRs,解释了交叉反应性.
结论:
- 这些发现支持一种假设,即微生物和自我抗原都对HLA-B*27相关的炎症性疾病的发病有所贡献.
- 由共享的基因驱动的TCR交叉反应是疾病发展的关键因素.
- 这项研究提供了有关HLA-B*27相关条件的分子机制的见解.
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