由心房引起的神经认知和血管功能障碍是通过线粒体氧化应激减缓来避免的
Pavithran Guttipatti1, Ruiping Ji1, Najla Saadallah1
1Division of Cardiology, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA.
JCI insight
|October 7, 2025
概括
心房动 (AF) 通过血管变化引起认知衰退,而不是中风. 一个新的小鼠模型显示,AF会损害大脑功能和血液流动,但线粒体催化酶可以阻止它.
科学领域:
- 心血管研究研究心血管研究
- 神经科学是一个神经科学.
- 线粒体生物学 线粒体生物学
背景情况:
- 心房动 (AF) 与认知能力下降有关,但机制尚不清楚.
- 现有的动物模型没有完全复制AF诱导的认知功能障碍,没有脑梗塞.
- 一个具有心脏特异性通道突变的双重转基因小鼠模型 (DTG-AF) 已被开发用于长时间的AF发作.
研究的目的:
- 建立和描述一种新的AF小鼠模型,在没有脑梗塞的情况下表现出认知功能障碍.
- 为了研究AF相关认知障碍背后的血管和线粒体机制.
- 评估线粒体催化酶 (mCAT) 在缓解AF诱导的大脑功能障碍方面的治疗潜力.
主要方法:
- 使用了一种DTG-AF小鼠模型,具有自发的,长时间的AF发作.
- 通过触摸屏测试来评估视觉学习和认知灵活性的认知功能.
- 分析了中腔和脑动脉功能,肌体基质,壁壁厚度,延展性和线粒体形态.
- 使用激光光斑对比成像测量脑输液.
- 研究了mCAT表达对血管功能, perfusion 和认知的影响.
主要成果:
- DTG-AF小鼠表现出认知缺陷,包括视觉学习和认知灵活性受损,没有脑梗塞.
- AF诱导了中腔动脉 (肌体质的损失,增加厚度/延展性) 和大脑血管动脉 (增加厚度,线粒体扩大) 的显著血管变化.
- DTG-AF小鼠表现出减少的大脑输液和线粒体功能障碍.
- mCAT表达阻止了血管功能障碍,恢复了大脑输液,并改善了认知灵活性.
结论:
- AF通过血管结构和功能变化诱导认知功能障碍,从而损害大脑自身调节,导致大脑压力增加.
- 线粒体功能障碍和氧化压力在AF相关的血管和认知障碍中起着关键作用.
- 使用mCAT准线粒体的活性氧物种 (ROS) 提供了一种潜在的治疗策略,以预防AF相关的认知衰退.
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