跨越血脑屏障的水交换速率与正常衰老中的认知表现之间的联系的区域差异
Valentinos Zachariou1, Colleen Pappas2, Christopher E Bauer2
1Department of Neuroscience, College of Medicine, University of Kentucky, Lexington, KY, USA. vzachari@uky.edu.
GeroScience
|September 15, 2023
概括
老龄化改变了血脑屏障 (BBB),影响了认知. 这项研究揭示了BBB水交换如何与老年人认知功能和大脑健康相关的区域差异.
科学领域:
- 神经成像是一种神经成像.
- 老年学是指老年学的学科.
- 认知神经科学 认知神经科学
背景情况:
- 血脑屏障 (BBB) 显示了与年龄相关的功能变化,可能导致认知能力下降.
- 通过MRI测量BBB的水交换率 (k w),可能反映了这些与年龄相关的变化.
- 以前的研究表明,k w 和认知之间存在矛盾的关联.
研究的目的:
- 为了研究BBB水交换 (k w) 和不同大脑区域的认知表现之间的关联的方向.
- 探索脑血管健康的k w ,认知和MRI标志物之间的关系.
- 了解BBB功能在衰老中的区域生理基础.
主要方法:
- 47名健康的老年人 (61-84岁) 接受了扩散准备的动脉旋转标记MRI,以测量整个大脑的K w .
- 使用MRI量化脑血管反应 (CVR) 和白质超强度 (WMH) 的体积.
- 参与者完成了评估执行功能 (EF) 和情节性记忆 (MEM) 的神经心理测试.
- 基于voxel的线性回归分析了k w ,认知分数,CVR和WMH体积之间的关联.
主要成果:
- 前端对称的k w与认知表现正相关,独立于CVR和WMH.
- 基底 k w 与认知表现和CVR负相关.
- 基底 k w 与区域周周结膜WMH体积正相关.
结论:
- BBB水交换 (k w ) 显示了与老年人的认知有区域依赖的关联.
- 新皮层区域的积极关联可能反映了与认知有关的保存的BBB功能.
- 皮下区域的负相关性可能表明与认知衰退和脑血管损伤相关的BBB功能障碍.
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