创伤性脑损伤改变了与年龄相关的线粒体变化的轨迹
Janna L Harris1,2, Xiaowan Wang1, Sarah K Christian1
1University of Kansas Alzheimer's Disease Research Center, Kansas City, KS, USA.
Journal of Alzheimer's disease : JAD
|February 2, 2024
概括
创伤性脑损伤 (TBI) 在小鼠中加速了与年龄相关的线粒体变化,这可能解释了TBI和阿尔茨海默病 (AD) 之间的联系. 这种补偿反应可能会增加大脑在以后的生活中对线粒体功能的需求.
科学领域:
- 神经科学是一个神经科学.
- 线粒体生物学 线粒体生物学
- 创伤性脑损伤研究研究
背景情况:
- 流行病学研究表明,创伤性脑损伤 (TBI) 和阿尔茨海默氏病 (AD) 之间存在联系.
- 调解这种关联的潜在机制仍在调查中.
- 线粒体功能障碍与阿尔茨海默病的发病有关.
研究的目的:
- 调查TBI是否加速与年龄相关的线粒体变化.
- 为了确定这些加速的线粒体变化是否调解TBI-AD关联.
- 探索线粒体DNA拷贝数 (mtDNAcn) 和TBI后呼吸链酶活性的作用.
主要方法:
- 对年轻成年C57BL/6J和tau转基因rTg4510小鼠进行控制的皮层冲击 (CCI) 或假伤害.
- 在受伤后的不同时间点评估行为缺陷,病变大小,呼吸链酶活动和mtDNAcn.
- 在受伤后转基因小鼠的大脑中量化mtDNAcn和纠负担.
主要成果:
- 在非转基因小鼠中,CCI诱导过渡性行为缺陷.
- 蛋白质正常化的呼吸链酶活动基本没有变化,尽管随着时间的推移,复杂I活性在皮质皮层下降.
- 海马体mtDNAcn随着年龄的增长而增加,特别是在缩性海马体,TBI增强了与年龄相关的增加.
结论:
- 衰老会增加大脑mtDNAcn作为对线粒体功能的补偿机制,这种反应被TBI增强.
- 在生命的后期,TBI可能需要更大的补偿性线粒体功能.
- 改变与年龄相关的线粒体变化的轨迹可能是TBI影响阿尔茨海默病风险的机制.
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