Nat Med:体外重建人类血脑屏障,并研究APOE4致病机制

2020-06-14 MedSci原创 MedSci原创

研究人员开发了一个基于诱导多能干细胞的三维模型,在体外重现了人类BBB的解剖和生理特性。

在阿尔茨海默病中,沿脑血管的淀粉样蛋白沉积导致一种被称为脑淀粉样血管病(CAA)的病症,它损害了血脑屏障(BBB)的功能,加速了认知退化。已有的研究显示,载脂蛋白4(APOE4)是CAA最强的危险因素,然而这种遗传易感性的机制尚不清楚。

最近,研究人员开发了一个基于诱导多能干细胞的三维模型,在体外重现了人类BBB的解剖和生理特性。

与CAA相似,在该体外BBB模型中,与APOE3相比,在APOE4中显示出明显更多的淀粉样蛋白积累。组合实验显示,激活T细胞的钙质蛋白-核因子(NFAT)信号和APOE在周围细胞样壁细胞中的失调会诱导APOE4相关的CAA病理。

在人脑中,APOE和NFAT在APOE4携带者的周围细胞中选择性失调。在体外和体内,抑制钙尿素-NFAT信号转导可减少APOE4相关CAA病理的发生。

因此,该研究揭示了APOE4介导的CAA中的细胞周细胞的作用,并强调了钙神经元素-NFAT信号作为CAA和阿尔茨海默病的治疗目标。

 

原始出处:

Joel W. Blanchard et al. Reconstruction of the human blood–brain barrier in vitro reveals a pathogenic mechanism of APOE4 in pericytes, Nature Medicine (2020). 

 

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    2021-03-13 liye789132251
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    2020-06-16 bnjfy
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    2020-06-16 xiongke016
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    2020-06-14 肿肿

    机制研究离临床仍然有距离,不过与临床结合思考,仍然有帮助的,不能仅仅是纯临床思维,转化思维同样重要

    0

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