血管蛋白信号是阿尔茨海默病中粉样蛋白驱动的血管功能障碍的中心轴
bioRxiv : the preprint server for biology
|September 5, 2025
概括
阿尔茨海默病 (AD) 血管功能障碍源于基因表达的变化,而不是细胞数量的变化,在轻微的认知障碍早期影响大脑内皮细胞和光滑肌肉细胞. 血管蛋白信号失调是阿尔茨海默病进展的关键因素.
科学领域:
- 神经科学
- 基因组学
- 血管生物学
背景情况:
- 神经血管单位对大脑健康至关重要, 其功能障碍与阿尔茨海默病 (AD) 有关.
- 人们对阿尔茨海默氏病的血管细胞功能障碍缺乏详细的,细胞类型的理解.
研究的目的:
- 在阿尔茨海默病进展过程中创建人类大脑血管系统的综合性转录图集.
- 识别AD期间血管功能障碍所涉及的细胞类型和分子通路.
主要方法:
- 对101名患者进行了血管隔离和核提取测序 (VINE-seq).
- 进行了超过842,646个副细胞和血管核的转录组分析.
主要成果:
- 阿尔茨海默病的血管功能障碍是由脑内皮细胞 (BEC) 和光滑肌细胞 (SMC) 的转录变化驱动的,而不是细胞比例的改变.
- 这些分子特征在轻度认知障碍 (MCI) 阶段很早就显现出来.
- 对于粉样β (Aβ) 和tau病理,观察到不同的血管反应,其中Aβ主要影响BEC和SMC,而tau影响质细胞.
- 失调的血管蛋白信号传递,特别是ANGPT2和ANGPT1,被确定为AD中逐渐改变的关键途径.
结论:
- 这项研究为了解阿尔茨海默病的早期和病理特异性血管功能障碍提供了基础资源.
- 血管变化是阿尔茨海默病变的早期事件,在MCI阶段可检测到.
- 向血管蛋白信号通路可能为阿尔茨海默病提供治疗途径.
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