生物标志物 生物标志物
Andrew R Bender1, Pavithran Pattiam Giriprakash1, Zhengshi Yang1
1Cleveland Clinic Lou Ruvo Center for Brain Health, Las Vegas, NV, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 26, 2025
概括
阿尔茨海默病的病理学,由粉样β (Aβ) 表示,改变大脑白质组织. 纤维分散的新型扩散MRI测量显示,与老年人Aβ水平和认知功能有很强的联系.
科学领域:
- 神经成像是一种神经成像.
- 神经科学是一个神经科学.
- 放射学 放射学是一门学科.
背景情况:
- 阿尔茨海默病 (AD) 与大脑微观结构的变化有关,可以通过扩散权重磁共振成像 (dMRI) 检测到.
- 较小,较晚发育的轴突在早期的AD可能是脆弱的,可能通过dMRI指标,如纤维密度 (FD) 和分散度来测量.
- 这项研究调查了粉样β (Aβ) 的升高是否预测非痴呆老年人的FD和纤维分散的变化以及它们与认知的关系.
研究的目的:
- 为了确定粉样β (Aβ) 水平是否与没有痴呆症的老年人白质微观结构的改变相关.
- 评估dMRI衍生纤维密度 (FD) 和纤维分散对Aβ相关神经病理学的敏感性.
- 探索这些微观结构变化与认知表现之间的关系.
主要方法:
- 122名参与者 (认知正常或轻度认知障碍) 接受了多层dMRI和粉样蛋白PET扫描.
- 使用MRtrix3处理的dMRI数据用于量化声向纤维密度 (FD) 和纤维分散.
- 质量无变量分析检查了Aβ (半角体水平),预测FD和分散,控制共变量;结果以家族错误率进行校正.
主要成果:
- 较高的Aβ预测了大脑关键区域 (例如,跨,环膜,海马) 的纤维分散减少,但大脑小区的分散增加.
- 纤维分散与Aβ百叶状物水平有很强的相关性 (r = -0.78,p < .001).
- Aβ积极预测特定白质区域的FD;纤维分散,而不是FD,在多个领域显著预测了认知表现.
结论:
- 粉样β (Aβ) 神经病理与没有痴呆症的成年人白质组织的改变有关.
- 纤维分散是一种新的dMRI测量,与Aβ水平和认知功能密切相关,独立于年龄和性别.
- 纤维密度和分散的组合建模为AD相关的微观结构变化和认知影响提供了互补的见解.
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