NATURE:阿尔兹海默危险基因APOE4破坏血脑屏障

2020-04-30 MedSci原创 MedSci原创

血管对痴呆症和阿尔茨海默氏症的贡献越来越多地被认可。最近的研究表明,血脑屏障(BBB)的损坏是人类认知功能障碍的早期生物标志物,包括阿尔茨海默氏症的早期临床阶段。

血管对痴呆症和阿尔茨海默氏症的贡献越来越多地被认可。最近的研究表明,血脑屏障(BBB)的损坏是人类认知功能障碍的早期生物标志物,包括阿尔茨海默氏症的早期临床阶段。

脂蛋白E(APOE4)的E4变体是阿尔茨海默氏症的主要易感基,其能够导致BBB的加速分解和脑毛细血管周围细胞的变性,而脑毛细血管周围细胞可以维持BBB的完整性。

然而,目前我们还不清楚,APOE4的脑血管效应是否导致了认知功能障碍。

最近,研究人员发现,与没有APOE4(ε3/ε3)的个体不同,携带APOE4(ε3/ε4或ε4/ε4等位基因)的个体海马和内侧颞叶的BBB存在损坏。这一现象在认知功能未受损的APOE4携带者中就十分明显,而在认知障碍的携带者中变得严重,且其与淀粉样蛋白-β或tau病变无关。

在APOE4携带者中,脑脊液中的高基线水平的BBB包膜细胞损伤生物标志物,可溶性PDGFRβ,可以预测未来的认知能力下降,即使在控制淀粉样蛋白-β和tau状态后也可以,这与在脑脊液中的BBB-降解环状蛋白A-矩阵金属蛋白酶-9途径19的活性增加相关。

因此,该研究结果表明,BBB的损坏参与APOE4相关的认知能力下降,并独立于阿尔茨海默氏症的病理,这可能是APOE4携带者的潜在治疗靶标。

 

原始出处:

Axel Montagne et al. APOE4 leads to blood–brain barrier dysfunction predicting cognitive decline. NATURE, 2020. 

 

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    2020-06-21 liye789132251
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    2020-05-02 bnjfy
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    2020-05-02 xiongke016

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