生物标志物 生物标志物
Sasha Hakhu1, Sydney Y Schaefer1, Scott C Beeman1
1Arizona State University, Tempe, AZ, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 26, 2025
概括
粉样蛋白沉积与大脑微观结构变化和认知衰退有关,即使在无症状个体中也是如此. 神经质密度指数 (NDI) 部分调解了这种关系,突出了早期的神经退行.
科学领域:
- 神经成像是一种神经成像.
- 神经退行发生神经退行.
- 阿尔茨海默氏症疾病研究研究
背景情况:
- 之前的研究将粉样蛋白沉积和微观结构性大脑变化 (神经质密度指数 - NDI) 与阿尔茨海默病 (AD) 联系起来.
- 在认知不受损的个体中,粉样蛋白和NDI之间的关系尚不清楚.
- 这项研究调查了粉样蛋白对无症状老年人NDI和认知的影响.
研究的目的:
- 在认知不受损的个体中调查粉样蛋白沉积和神经元退化 (较低的NDI) 之间的联系.
- 确定NDI是否调解了粉样蛋白水平和全球认知之间的关系.
- 专注于关键的大脑区域:脑内皮层和状圈.
主要方法:
- 来自ADNI3数据库的65名认知不受损的老年人的分析.
- 先进的扩散MRI (dMRI) 来获得NDI;PET成像用于粉样蛋白水平.
- 相关性和调解分析评估了粉样蛋白,NDI和全球认知 (MoCA),并进行了统计纠正.
主要成果:
- 在内腔皮层 (EC) 和状回形 (FG) 中发现了粉样蛋白和NDI之间的显著负相关性.
- 左侧EC:r=-0.304,左侧FG:r=-0.344,右侧EC:r=-0.350,右侧FG:r=-0.421.
- NDI在左侧EC和FG中部分调解了粉样蛋白和认知之间的关系.
结论:
- 左侧EC和FG中的粉样蛋白沉积与无症状个体的微观结构退化和认知衰退有关.
- 较高的粉样蛋白水平与较大的神经退行和较低的认知分数相关,甚至在症状出现之前.
- NDI发挥了部分调解作用,强调了它在早期AD相关变化中的重要性.
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