生物标志物 生物标志物
Talia M Nir1, Sunanda Somu1, Kevin Low1
1Imaging Genetics Center, Mark and Mary Stevens Neuroimaging & Informatics Institute, University of Southern California, Marina del Rey, CA, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 24, 2025
概括
先进的扩散MRI测量显示大脑中的粉样β (Aβ) 与皮质厚度的联系比皮质厚度更强,可能揭示早期阿尔茨海默病的变化. 这些发现表明dMRI提供了对临床前神经病理学更深入的见解.
科学领域:
- 神经成像是一种神经成像.
- 阿尔茨海默氏症疾病研究研究
- 大脑微观结构分析
背景情况:
- 扩散MRI (dMRI) 检测到微妙的大脑微观结构的变化,可能在宏观结构变化之前识别早期阿尔茨海默病 (AD) 病理.
- 皮质灰质 (GM) 在AD早期受到影响;dMRI可能比皮质厚度 (CTh) 更好地捕捉粉样β (Aβ) 效应.
研究的目的:
- 评估Aβ-PET和单皮质dMRI测量在认知正常 (CN) 个体之间的关系.
- 为了比较dMRI发现与与Aβ负载相关的传统CTh测量.
主要方法:
- 在四项AD研究中分析了769名CN参与者的T1w,dMRI和Aβ-PET数据.
- 应用先进的dMRI模型 (NODDI-DTI,MAP-AMURA) 与DTI一起使用.
- 提取区域皮质MRI测量和测试协会与Aβ-PET百叶状物,调整为共变量和tau-PET状态.
主要成果:
- 与三个dMRI测量和CTh相关的Aβ-PET百叶状物.
- 先进的dMRI模型揭示了Aβ和更高的APA (阻碍扩散) 和更低的ODI (神经元分散) 之间的更广泛的关联.
- 较低的ODI被tau阳性调节,表明tau阳性个体的效果更大.
结论:
- 先进的dMRI测量显示,与CTh相比,Aβ负载的相关性更广泛.
- 与Aβ相关的阻碍扩散 (APA,FA) 的增加可能表明早期的细胞变化或炎症.
- 与Aβ相关的减少神经元分散 (ODI) 表明神经退行,特别是在tau阳性个体中,突出显示dMRI对早期AD过程洞察力的潜力.
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