Stroke:Aβ和Tau在脑小血管疾病和皮质微梗死之间的关系

2021-02-13 MedSci原创 MedSci原创

阿尔茨海默病(AD)是最常见的痴呆病因,是人口老龄化面临的一个最重的问题。

阿尔茨海默病(AD)是最常见的痴呆病因,是人口老龄化面临的一个最重的问题。据《国际阿尔茨海默病报告》显示,2015年全球有4700万AD患者,预计到2050年将增加到1.31亿人。

AD的神经病理特征是高度磷酸化的tau蛋白在神经元中沉积缠绕形成神经纤维缠结(NFTs),以及淀粉样蛋白β(Aβ)的聚集。高度磷酸化的tau蛋白也普遍存在于神经元中,这与神经斑块内的神经元密切相关。虽然这些病理改变在AD的整个临床阶段的积累已成共识,但最新的研究发现,无认知障碍的老年脑中也可观察到上述病理变化。

目前,降低痴呆的长期策略主要是尽早识别疾病危险因素并对疾病过程进行干预,从而推迟疾病的发生。文献证据表明,遗传、社会心理、血管和生活方式等危险因素共同对痴呆及AD的发生起作用。其中,最广为接受的就是伴有血管病变的痴呆发展。越来越多的证据也进一步证实了血管病变如何导致认知障碍的过程:1)血管病变可能与AD病理的发病机制有关,2)血管疾病与痴呆的相关性,3)血管危险因素易使个体发生血管性痴呆和AD的发病。

与此同时,大家也越来越认识到因大脑血管病变引起的皮层微梗死对整体大脑健康、认知和阿尔茨海默病的重要性。大脑小血管病变与微梗死相关,并经常与阿尔茨海默病共存;然而,tau蛋白在多大程度上调控了微血管的发病机制,目前尚不完全清楚。

为此,来自美国拉什大学医学中心的研究团队对小血管病变、动脉硬化和脑淀粉样血管病变与tau缠结负担程度不同的人群皮质微梗死之间的关系进行了探讨。相关结果发表在最新的《卒中》(Stroke)杂志上。

研究人员对1489名来自3个临床病理中心的老年人(平均死亡年龄89岁,67%为女性),进行了尸检。利用免疫组化鉴定了8个脑区的皮质tau缠结负担,并由此对脑血管病情况进行半定量分级,并评估是否存在皮质微梗死。

结果显示,17%的老年人存在皮质微梗死,36%的老年人存在中重度脑淀粉样血管病病理表现,34%的老年人存在动脉硬化。使用logistic回归模型分析,确定了tau蛋白沉积与脑小血管病的相互作用,说明Aβ和tau蛋白沉积负担较重的情况下,动脉硬化与皮质微梗死的关联性更强。

同时,分析显示,脑淀粉样血管病也出现了交互作用,提示Aβ较高和tau缠结负担较高的情况下,脑淀粉样血管病和皮质微梗塞之间的关联更加密切。

该研究结果表明,Aβ或Tau蛋白沉积负担较重的情况下,小血管病变往往预示着微血管组织损伤较重。这也从侧面显示了神经退行性和脑血管病变机制之间的潜在联系。

 

参考文献:

Kapasi A, et al. Aβ (Amyloid Beta) and Tau Tangle Pathology Modifies the Association Between Small Vessel Disease and Cortical Microinfarcts. Stroke. 2021 Feb 11:STROKEAHA120031073. doi: 10.1161/STROKEAHA.120.031073.

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    2021-02-15 hb2008ye
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    2021-02-15 膀胱癌
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    2021-02-13 Dr.neuro

    脑小血管病相关血管性痴呆可防可治,值得重视#痴呆#

    0