JAHA:颈动脉钙化导致的动脉僵硬扰乱脑血流调节并导致认知缺陷

2019-05-06 xing.T 网络

这些研究结果表明,颈动脉僵硬会改变脑微循环,并增加与认知障碍相关的血脑屏障通透性。因此,动脉硬度应被视为保护大脑和预防认知功能障碍的相关目标。

动脉僵硬度与认知能力下降和痴呆有关;然而,它影响大脑的确切机制仍不清楚。近日,血管疾病领域权威杂志JAHA上发表了一篇研究文章,研究人员使用基于颈动脉钙化的小鼠模型,探究了可能由于动脉僵硬而导致脑退化的机制。

在颈动脉钙化后2周,通过放射自显影确定的颈动脉硬度减弱了包括周围/内嗅皮质、海马和丘脑在内的几个脑区的静息脑血流量(P<0.05)。通过激光多普勒血流仪测定颈动脉钙化损害脑自动调节和减少脑血流对神经元活动和乙酰胆碱的反应(P<0.05和P<0.01)。

颈动脉僵硬度在3周时显著影响空间记忆(P<0.05),但在2周时未显著影响空间记忆,表明脑血管损伤先于认知功能障碍。与内皮细胞缺陷一致,颈动脉僵硬导致海马血脑屏障通透性增加(P<0.01)。该区域还表现出含有胶原蛋白IV的血管数量减少(P<0.01),躯体感觉皮层也是如此(P<0.05)。没有脑微出血的证据。颈动脉僵硬度不影响小鼠淀粉样蛋白-β(Aβ)或tau磷酸化的产生,尽管它导致额叶皮质中Aβ40/Aβ42比例的适度增加(P<0.01)。

这些研究结果表明,颈动脉僵硬会改变脑微循环,并增加与认知障碍相关的血脑屏障通透性。因此,动脉硬度应被视为保护大脑和预防认知功能障碍的相关目标。 

原始出处:

Gervais Muhire.et al.Arterial Stiffness Due to Carotid Calcification Disrupts Cerebral Blood Flow Regulation and Leads to Cognitive Deficits.JAHA.2019.https://www.ahajournals.org/doi/full/10.1161/JAHA.118.011630

本文系梅斯医学(MedSci)原创编译整理,转载需授权!

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    2019-05-08 zhaohui6731
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