实验性缺血性中风诱导二次双半球白质退化和长期认知障碍
Ran Liu1, Raymond Berry1, Linshu Wang1
1Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, 3500 Camp Bowie Blvd, Fort Worth, TX, 76107, USA.
Translational stroke research
|March 15, 2024
概括
实验性缺血性中风在老鼠中导致持久的认知缺陷和广泛的白质变性,反映了人类中风的结果. 这个模型有助于研究中风后认知障碍和痴呆症.
科学领域:
- 神经科学是一个神经科学.
- 神经学 神经学
- 脑卒中研究 脑卒中研究
背景情况:
- 临床研究表明,缺血性中风患者的白质退化显著.
- 脑卒中研究在很大程度上忽视了白质损伤及其与中风后认知障碍和痴呆症 (PSCID) 的联系.
- 需要实验模型来研究中风后白质变性.
研究的目的:
- 研究缺血性中风对大鼠运动和认知功能的长期影响.
- 在缺血性中风后使用多模式MRI评估白质变性.
- 建立一种复制人类中风诱导的白质变化和认知缺陷的老鼠模型.
主要方法:
- 在年轻成年大鼠中,通过中脑动脉封闭诱导缺血性中风.
- 使用行为测试 (莫里斯水迷宫,升高加迷宫,开放场地) 来评估运动和认知功能,直至中风后4个月.
- 多模式核磁共振 (T2WI,FLAIR,DWI) 用于评估白质的完整性,包括体和体.
- 组织学分析微质细胞和质体中星球细胞的激活.
主要成果:
- 尽管部分发动机恢复,但老鼠表现出持续的长期认知和情感障碍.
- 核磁共振扫描显示了双边大脑静脉扩大和白质在体和体中的超强度.
- 扩散加权成像显示,体中分数异性质和定量异性质减少,表明白质变性.
- 在中风后的体中观察到微质细胞和天体细胞激活的增加.
- 在白质超强度和脑心室体积之间发现了相关性.
结论:
- 实验性缺血性中风在老鼠中复制了人类中风患者长期认知缺陷和双半球白质变性.
- 这种动物模型对于研究二次白质退化的机制及其在PSCID中的作用非常有价值.
- 这些发现强调了针对白质完整性的重要性,以恢复中风和预防认知衰退.
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