在一个衰老队列研究中,在中西部阿米什人中减少了体质T细胞受体序列多样性概况的证据
medRxiv : the preprint server for health sciences
|February 6, 2026
概括
晚期阿尔茨海默病 (LOAD) 涉及自适应性免疫系统. 在LOAD和轻度认知障碍 (MCI) 患者中观察到T细胞受体 (TCR) 多样性的减少,特别是在与升高的p-tau181水平相关时.
科学领域:
- 神经免疫学 神经免疫学
- 老年医学 老年医学
- 遗传学 遗传学 是一个
背景情况:
- 晚期阿尔茨海默病 (LOAD) 是老年人常见的痴呆症,其特征是粉样蛋白β斑块和神经纤维状结.
- 虽然LOAD的确切原因尚不清楚,但新出现的证据表明适应性免疫系统的作用.
研究的目的:
- 调查T细胞受体 (TCR) 序列多样性和人类白细胞抗原 (HLA) 基因与中西部阿米什队伍的认知状态相关.
- 探索免疫标记物和LOAD病原体之间的潜在关联.
主要方法:
- 从72名中西部阿米什参与者的基因组DNA中对TCRβ链进行免疫测序,跨越认知频谱 (LOAD,MCI,CINAD,认知不受影响).
- 对TCR序列多样性指标和HLA等位基因频率的分析.
- 参与者的子集中的TCR多样性与血生物标志物 (p-tau181) 的相关性.
主要成果:
- 通过辛普森克隆度测量的TCR序列多样性,在LOAD+MCI参与者中低于非LOAD参与者,尽管不独立于年龄.
- 在LOAD+MCI中,特定的HLA等位基因 (HLA-A*03:01,HLA-DRB1) 代表性不足,但经过调整后,关联失去了意义.
- 在具有可用的血数据的LOAD+MCI参与者中,增加的p-tau181显著与降低的TCR序列多样性相关,而不依赖年龄.
结论:
- 在这个样本中观察到TCR多样性和认知状态之间的关联支持了适应性免疫系统在LOAD中的参与.
- TCR序列的多样性可以作为LOAD的潜在生物标志物,特别是当与其他病理标志物 (如p-tau181.1) 一起考虑时.
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