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在老年人中,海马子的微观结构的纵向非线性变化

Ghina Zia¹, Syed Salman Shahid¹, Ho-Ching Yang¹

¹Indiana Alzheimer's Disease Research Center, Indiana University School of Medicine, Indianapolis, IN, USA; Center for Neuroimaging, Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA.

Neurobiology of aging

|August 2, 2025

概括

老化的大脑在海马体中显示微观结构变化,特别是在Cornus Ammonis区域. 先进的MRI显示扩散增加和神经元密度下降,与年龄和基线指标相关.

科学领域:

神经科学是一个神经科学.
放射学放射学是一门学科.
老年学是一门学科.

背景情况:

人类大脑衰老与神经退行性疾病有关,但潜在的机制尚不清楚.
与年龄相关的神经认知衰退需要理解大脑的微观结构变化.
海马很容易受到早期阿尔茨海默病 (AD) 病理的影响.

研究的目的:

用扩散MRI (dMRI) 来研究海马体子领域与年龄相关的微观结构差异.
量化在特定海马子场内扩散指标的纵向变化.
将这些变化与年龄和基线微观结构性质联系起来.

主要方法:

对37名认知正常的老年人 (平均年龄为70.6岁) 的长度研究.
在MRI扫描上使用了灰色物质特定的多隔间扩散模型 (皮质-NODDI).
在海马子场 (CA1-3,CA4DG, subiculum) 中获得的导向分散指数 (ODI) 和神经元密度指数 (NDI).
对性别,教育,APOE ε4和基线体积进行调整的线性回归分析.

主要成果:

海马的CA1-3和 subiculum亚场显示,随着时间的推移,体积显著下降.
在CA4DG.中观察到ODI变化率的增加.
在CA1-3和CA4DG中发现NDI变化率下降.
在CA1-3中ODI变化率与参与者的年龄和基线ODI相关.

结论:

康努亚蒙尼斯 (CA) 地区对与年龄相关的微观结构变化高度敏感.
衰老与CA子领域中微结构分散 (ODI) 的增加和神经元密度 (NDI) 的降低有关.
这些与年龄相关的变化取决于个体的初始微观结构状态和年龄.

关键词:

衰老的衰老衰老的衰老扩散式核磁共振成像 (MRI)河马的子场河马子场纵向的纵向的纵向的微观结构的微观结构

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