持续免疫年轻人可能会在老年宿主中患上自身免疫性疾病
Cornelia M Weyand1,2,3,4, Jörg J Goronzy5,6,7
1Department of Medicine, Mayo Clinic Alix School of Medicine, Rochester, MN, USA. cweyand@stanford.edu.
Nature aging
|August 14, 2025
概括
矛盾的是,老龄化增加了自身免疫疾病的风险,因为它维持了免疫能力,而不是削弱了它. 老化宿主中的这种"免疫青春"助长了巨细胞动脉炎等疾病,挑战了对免疫衰老的传统观点.
科学领域:
- 免疫学 免疫学 免疫学
- 老年学是一门学科.
- 这是一种自身免疫力.
背景情况:
- 免疫反应可以防止感染和癌症,但随着年龄的增长,自身免疫疾病的风险会增加.
- 许多自身免疫性疾病,包括巨细胞动脉炎,在晚年发病率达到峰值.
- 老龄化传统上被视为导致免疫力下降,但自身免疫力上升.
研究的目的:
- 调查老龄化是否会使个人产生自身免疫.
- 探索持续免疫能力在自身免疫性疾病进展中的作用.
- 重新评估免疫衰老的概念作为对自身免疫的保护机制.
主要方法:
- 讨论和综合现有关于免疫反应在衰老和自身免疫的研究.
- 专注于自身免疫性血管炎巨细胞动脉炎作为一种模式疾病.
- 对干状记忆CD4+T细胞 (T_SCM) 和抗原呈现细胞在疾病发病过程中的作用的分析.
主要成果:
- 巨细胞动脉炎的疾病进展是由不适合年龄的免疫能力驱动的.
- 在病变附近的干状记忆CD4+T细胞 (T_SCM) 提供了致病性T细胞的持续来源.
- 由于抗原呈现细胞缺乏抑制性连接体和新抗原,导致周围耐受性受损,促进自身免疫力.
结论:
- 持续的免疫能力 ("免疫年轻") 在衰老中可能是有害的,导致自身免疫.
- 免疫衰老可能是一个有益的适应,平衡自我和非自我抗原反应.
- 这挑战了免疫衰退仅仅解释了与年龄相关的疾病的概念,突出了免疫衰老的悖论.
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