对神经激活的脑血流反应在具有β-粉样蛋白积累的认知正常男性中减少
Mark Bitsch Vestergaard1, Aftab Bakhtiari2,3, Merete Osler4,5
1Functional Imaging Unit, Department of Clinical Physiology and Nuclear Medicine, Copenhagen University Hospital Rigshospitalet, Valdemar Hansens Vej 1-23, Glostrup, 2600, Denmark. Mark.bitsch.vestergaard@regionh.dk.
Alzheimer's research & therapy
|January 4, 2025
概括
在认知正常的个体中,β-粉样蛋白 (Aβ) 的积累与神经元激活期间大脑血流 (CBF) 反应的减少有关. 这表明早期的大脑血管功能障碍可能会在阿尔茨海默氏症 (AD) 中发生神经退行.
科学领域:
- 神经科学是一个神经科学.
- 医疗成像医学成像
- 心血管科学 心血管科学
背景情况:
- 阿尔茨海默病 (AD) 的特点是大脑中β-粉样蛋白 (Aβ) 的积累.
- 甲β可能会损害脑血管功能,导致AD的发病.
- 这项研究调查了在正常认知过程中Aβ和脑血流 (CBF) 反应之间的联系.
研究的目的:
- 为了检查Aβ积累是否与认知正常受试者对视觉神经元激活的CBF反应减少相关.
- 探索Aβ负担与脑血管功能之间的关联.
主要方法:
- 64名认知正常的受试者接受了动脉旋转标记 (ASL) 和BOLDMRI的 ΔCBFVis.Act测量.
- 阳离子发射断层扫描 (PET) 使用[C]匹兹堡化合物-B (PiB) 评估了Aβ,[F]氧糖 (FDG) 评估了葡萄糖代谢.
- 结构性MRI测量了皮质厚度.
主要成果:
- 在激活的大脑区域Aβ积累 (PiB SUVr) 和ΔCBFVis.Act之间发现了显著的负相关性 (r = -0.30,p = 0.025).
- 在ΔCBFVis.Act和葡萄糖代谢 (FDG SUVr) 或皮质厚度之间没有观察到相关性.
- 休息CBF没有显示与PiBSUVr在检查区域的相关性.
结论:
- Aβ积累与大脑血管功能受损有关,由CBF对神经元激活的反应减少证明.
- 这种脑血管功能障碍发生在皮层稀释或低代谢的独立性.
- 由Aβ诱导的血管功能障碍可能是AD等神经退行性疾病发展的早期病理事件.
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