在血液和胰腺之间共享的自我反应的生殖系类似的TCRα链
Peter Linsley1, Maki Nakayama2, Elisa Balmas3
1Benaroya Research Institute at Virginia Mason.
Research square
|October 27, 2023
概括
血液中的人类小岛抗原反应性CD4+T细胞 (IAR T细胞) 透到胰腺,导致1型糖尿病 (T1D) 的进展. 共享的T细胞受体序列将血液IAR T细胞与T1D中的胰腺T细胞联系起来.
科学领域:
- 免疫学 免疫学 免疫学
- 内分泌学 在内分泌学.
- 遗传学 遗传学 是一个
背景情况:
- 自免疫型1型糖尿病 (T1D) 的发病过程涉及人类小岛抗原反应性CD4+记忆T细胞 (IAR T细胞).
- 在T1D进展中IAR T细胞的作用和胰腺透仍然不太清楚.
- 在外周血液中,IAR T细胞是罕见的,这使得它们的研究变得复杂.
研究的目的:
- 来自具有不同T1D状态的捐赠者的IAR T细胞的T细胞受体 (TCR) 的识别和表征.
- 为了研究血源IAR T细胞透到胰腺中的情况.
- 确定IAR T细胞特征与T1D进展阶段之间的关联.
主要方法:
- 单细胞RNA测序和多重激活诱导标记 (AIM) 丰富试验,以识别IAR T细胞中的配对TCRα/β (TRA/TRB) 序列.
- 使用TCR序列作为条形码来量化IAR T细胞透到来自器官捐献者的胰腺组织.
- 分析外周血液和胰腺透T细胞 (PIT) 之间的TCR序列共享和特征 (例如,TRA结,J基因区域,公共TRA链).
主要成果:
- 在外围血液IAR T细胞和胰腺透T细胞 (PIT) 之间检测到广泛的TCR共享 (约34%的独特IAR TCR),具有匹配或单个不匹配的TRA结和J基因区域.
- 与PIT匹配的IAR T细胞表现出公开的TRA链,并增加了用于表位素参与的生殖系编码残留物的使用,这表明交叉反应性.
- 分享的TRA结点和IAR T细胞的血液水平增加与T1D的糖尿病前期和新发病阶段有关.
结论:
- 具有共享TCR特征的自身反应性IAR T细胞透到胰腺,在T1D病变发生过程中发挥重要作用.
- 这些发现涉及T1D发展早期的特定IAR T细胞群.
- 这项研究提供了一种用于跟踪IAR T细胞迁移的新方法,并将其特征与T1D进展联系起来.
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