生物标志物 生物标志物
Maria Sevilla-García1,2, Federico Ramírez2,3, Fernando Maestú2,3,4
1Technical University of Madrid, Madrid, Madrid, Spain.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 25, 2025
概括
大脑结构随着年龄的增长而变化,即使在健康的个体中也是如此. 关键的解剖学测量和扩散指标,如分数异构 (FA) 的下降,而轴向扩散率 (AD) 和辐射扩散率 (RD) 的增加,表明衰老.
科学领域:
- 神经成像是一种神经成像.
- 老年学是一门学科.
- 大脑解剖学 大脑解剖学
背景情况:
- 健康衰老涉及大脑的结构和功能变化,影响认知.
- 区分正常衰老和神经退行对于健康策略至关重要.
- 大脑的可塑性是衰老期间认知功能的一个关键因素.
研究的目的:
- 为了研究大脑解剖学和结构连接的与年龄相关的变化.
- 为了将特定的MRI衍生的指标与健康成年人的时间年龄相关联.
主要方法:
- 分析了278名年龄在50-82岁之间的健康成年人的MRI数据.
- 使用FreeSurfer提取的皮质和皮质下大脑测量 (例如,海马体积,灰质体积,皮质厚度).
- 使用扩散张力成像 (DTI) 度量 (FA,NoS,AD,RD) 通过MRtrix3.3评估结构连接.
主要成果:
- 在所有解剖学大脑测量中观察到与年龄相关的显著下降.
- 分数异构性 (FA) 随着年龄的增长显著下降.
- 轴扩散率 (AD) 和辐射扩散率 (RD) 随着年龄的增长而显著增加.
结论:
- 老化的大脑经历了显著的解剖和结构变化,即使没有病理.
- 这些发现突出了与健康衰老相关的规范性大脑变化.
- 了解这些变化对于开发有针对性的衰老干预措施至关重要.
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