与年龄相关的氧化应激和淋巴结筋细胞中的线粒体功能障碍限制了外围T细胞的恒温维护和功能
Sandip Ashok Sonar1,2, Ruchika Bhat1,2, Heather L Thompson1,2
1Department of Immunobiology, University of Arizona College of Medicine-Tucson, Tucson, Arizona, USA.
Aging cell
|May 21, 2025
概括
衰老会损害淋巴结 (LN) 功能,原因是线粒体功能障碍和 stromal 细胞中的氧化应激. 在老年小鼠中,抗氧化剂治疗恢复了免疫细胞的数量和功能,突出了潜在的治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 衰老的研究研究.
- 细胞生物学 细胞生物学
背景情况:
- 淋巴结 (LN) 对于免疫反应和维持幼稚淋巴细胞至关重要.
- 衰老会损害LN功能,影响免疫反应,但潜在的机制尚不清楚.
- 众所周知,与年龄相关的LN stromal细胞的退行性变化会影响免疫功能.
研究的目的:
- 为了研究LN stromal细胞中与年龄相关的缺陷的性质.
- 确定线粒体功能障碍和氧化应激在LNS老化中的作用.
- 评估抗氧化剂干预措施在老年人中恢复LN功能的潜力.
主要方法:
- 从年轻和老小鼠中分离的LN stromal细胞 (FRC,LEC,BEC) 中分析线粒体功能 (ROS,潜力,质量).
- 在实验室中评估LN stromal细胞对T细胞存活的支持.
- 在体内给老年小鼠服用抗氧化剂 (NAC,线粒氨酸,乌罗氨酸A).
- 在接受NAC.治疗的老年小鼠中,对抗原特异性CD8+T细胞接种后反应的评估.
主要成果:
- 衰老导致线粒体ROS增加,线粒体潜力减少,并在所有主要的LN stromal细胞子集中增加线粒体质量.
- 旧的LN stromal细胞在体外显示T细胞存活支持受损,这被抗氧化剂所拯救.
- 在FRC中,线粒体功能障碍在感染或疫苗接种期间被观察到体内.
- 在老年小鼠体内进行NAC治疗,恢复了CD8+T细胞数量和大酶B的产生,达到年轻成年人所见的水平.
结论:
- 与年龄相关的淋巴结 stromal 细胞功能障碍的特征是线粒体功能障碍和氧化应激.
- 用抗氧化剂准线粒体功能障碍和氧化应激可以恢复老年人的免疫反应.
- 这些发现表明,增强老年人的免疫力是一种有希望的治疗策略.
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