人类大脑中的神经元微观结构变化与神经认知衰老有关
Kavita Singh1, Stephanie Barsoum1, Kurt G Schilling2
1Multiscale Imaging and Integrative Biophysics Unit, National Institute on Aging, NIH, Baltimore, Maryland, USA.
Aging cell
|April 25, 2024
概括
大脑灰质 (GM) 的微观变化是衰老认知衰退的早期指标,可以通过扩散MRI检测到. 这些微观结构的改变,而不是可见的缩,与认知表现相关,为早期诊断提供了潜力.
科学领域:
- 神经成像是一种神经成像.
- 衰老研究研究 衰老研究
- 神经科学是一个神经科学.
背景情况:
- 与年龄相关的灰质 (GM) 变化与阿尔茨海默氏症等疾病的认知衰退有关.
- 目前的MRI研究主要集中在宏观的转基因变化上,缺少早期的微妙变化.
- 像皮层厚度这样的形态指标对缩前的变化不敏感.
研究的目的:
- 为了研究扩散MRI作为一种工具,用于检测老化大脑的早期微观结构变化GM.
- 评估这些微观结构变化与认知/行为缺陷之间的关联.
- 探索微观结构变化是否先于宏观缩和认知衰退.
主要方法:
- 使用了人类连接体项目-衰老队列 (N=707,年龄36-90岁).
- 应用了平均明显扩散传播器模型来量化微观结构参数.
- 收集了全面的认知和行为测试成绩.
主要成果:
- 宏观和微观结构的转基因特征都与年龄有很强的相关性.
- 微观结构变化表明细胞形态,密度,细胞外体积和膜透性的改变.
- 在宏观的GM体积和神经行为性能之间没有发现相关性.
- 皮层和皮层下微观结构的改变与神经行为表现有显著的关联.
结论:
- 转基因中的微观结构变化先于宏观变化,并与认知衰退有关.
- 增加的微观结构异质性和减少的神经元分散可能作为神经认知表现的早期标志物.
- 扩散MRI提供了敏感的标记,用于识别衰老和功能衰退的机制.
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