Reconstruction of the human blood-brain barrier in vitro reveals a pathogenic mechanism of APOE4 in pericytes.

Reconstruction of the human blood-brain barrier in vitro reveals a pathogenic mechanism of APOE4 in pericytes.
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DOI:
10.1038/s41591-020-0886-4
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发表时间:
2020-06
期刊:
影响因子:
82.9
通讯作者:
Tsai LH
Tsai LH
中科院分区:
医学1区
文献类型:
--
作者:
Blanchard JW;Bula M;Davila-Velderrain J;Akay LA;Zhu L;Frank A;Victor MB;Bonner JM;Mathys H;Lin YT;Ko T;Bennett DA;Cam HP;Kellis M;Tsai LH

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In Alzheimer’s disease (AD), amyloid deposits along the brain vasculature leading to a condition known as cerebral amyloid angiopathy (CAA), which impairs blood-brain barrier (BBB) function and accelerates cognitive degeneration. APOE4 is the strongest risk factor for CAA, yet the mechanisms underlying this genetic susceptibility are unknown. Here, we developed an iPSC-based 3D model that recapitulates anatomical and physiological properties of the human BBB in vitro. Similar to CAA, our in vitro BBB displayed significantly more amyloid accumulation in APOE4 compared to APOE3. Combinatorial experiments revealed that dysregulation of Calcineurin/NFAT-signaling and APOE in pericyte-like mural cells induces APOE4-associated CAA pathology. In the human brain, we identify APOE and NFAT are selectively dysregulated in pericytes of APOE4-carriers, and that inhibiting calcineurin/NFAT-signaling reduces APOE4-associated CAA pathology in vitro and in vivo. Our study reveals the role of pericytes in APOE4-mediated CAA and highlights calcineurin/NFAT-signaling as a therapeutic target in CAA and AD.
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