在正常衰老和阿尔茨海默病的基础前脑体积的纵向轨迹
Ying Xia1, Paul Maruff2, Vincent Doré3
1The Australian e-Health Research Centre, CSIRO Health and Biosecurity, Brisbane, Queensland, Australia.
Neurobiology of aging
|October 6, 2023
概括
阿尔茨海默病涉及大脑变化,如粉样蛋白β (Aβ) 斑块和基底前脑 (BF) 功能障碍. 这项研究表明,Aβ加速BF和海马体体积损失,特别是在阿尔茨海默氏症早期的特定胆固醇区域.
科学领域:
- 神经科学是一个神经科学.
- 神经学 神经学
- 阿尔茨海默氏症疾病研究研究
背景情况:
- 胆固醇基底前脑 (BF) 功能障碍和粉样蛋白β (Aβ) 沉积是早期阿尔茨海默病 (AD) 的特征.
- 这些早期病理特征之间的确切关联仍然不完全理解.
研究的目的:
- 为了研究Aβ沉积与老年人基础前脑 (BF) 和海马体的纵向体积损失之间的关系.
- 确定Aβ积累是否对BF的子区域产生不同影响,特别是在认知状态的背景下.
主要方法:
- 使用连续磁共振成像 (MRI) 扫描对516名老年人的纵向体积分析.
- 粉样β正子发射断层扫描 (Aβ-PET) 图像成像,以评估Aβ负担.
- 基于基线认知状态 (认知不受损[CU]与认知受损[CI]) 和Aβ状态 (Aβ-与Aβ+) 的组比较.
主要成果:
- 较高的Aβ水平与BF和海马体中加速体积损失显著相关.
- Aβ对BF体积损失的影响在各次区域各不相同.
- 认知障碍的Aβ阳性个体在Ch4p亚区域表现出与认知无障碍的Aβ阳性个体相比,与Aβ相关的体积损失显著增加;在Ch1/Ch2区域没有发现这种差异.
结论:
- 基础前脑 (BF) 在阿尔茨海默病病理学背景下表现出早期和显著的脆弱性.
- 粉样β的积累驱动了BF和海马体中加速的神经退行.
- BF的不同亚区域,特别是Ch4p区域,在早期AD中显示与Aβ负担和认知状态相关的差异性退化模式.
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