β-Amyloid Clustering around ASC Fibrils Boosts Its Toxicity in Microglia.

β-Amyloid Clustering around ASC Fibrils Boosts Its Toxicity in Microglia.
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DOI:
10.1016/j.celrep.2020.02.025
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发表时间:
2020-03-17
期刊:
影响因子:
8.8
通讯作者:
Heneka MT
Heneka MT
中科院分区:
生物学1区
文献类型:
--
作者:
Friker LL;Scheiblich H;Hochheiser IV;Brinkschulte R;Riedel D;Latz E;Geyer M;Heneka MT

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阿尔茨海默病是世界上最常见的神经退行性疾病。它与神经炎症有关,涉及由β-淀粉样蛋白(Aβ)沉积激活的小胶质细胞。在以往研究的基础上,结合和交叉种植细胞外Aβ,我们研究了A C在原代小胶质细胞之间的增殖以及A C-Aβ复合体对小胶质细胞炎症小体和功能的影响。事实上,嗜酸性细胞释放的ASC可以功能性地构建在邻近的小胶质细胞点状受体蛋白(NLRP3)炎症体中。与单纯应用蛋白质相比,暴露于Asc-Aβ复合体会放大致炎反应,导致嗜酸性细胞死亡,释放具有功能的Asc,并诱导前馈刺激的恶性循环。聚集在ASC纤维周围也影响了小胶质细胞对Aβ的清除。总而言之,这些数据使我们能够更仔细地观察通过形成β-Aβ复合体而从急性到慢性A-A相关神经炎的转折点。Friker等人。研究原代小胶质细胞对外源性Asc和Asc-Aβ复合材料的反应。他们发现了一个恶性循环,涉及在ASC存在的情况下放大的NLRP3炎症体活性和减少的Aβ清除,这可能在阿尔茨海默病的进展中发挥关键作用。
Alzheimer’s disease is the world’s most common neurodegenerative disorder. It is associated with neuroinflammation involving activation of microglia by β-amyloid (Aβ) deposits. Based on previous studies showing apoptosis-associated speck-like protein containing a CARD (ASC) binding and cross-seeding extracellular Aβ, we investigate the propagation of ASC between primary microglia and the effects of ASC-Aβ composites on microglial inflammasomes and function. Indeed, ASC released by a pyroptotic cell can be functionally built into the neighboring microglia NOD-like receptor protein (NLRP3) inflammasome. Compared with protein-only application, exposure to ASC-Aβ composites amplifies the proinflammatory response, resulting in pyroptotic cell death, setting free functional ASC and inducing a feedforward stimulating vicious cycle. Clustering around ASC fibrils also compromises clearance of Aβ by microglia. Together, these data enable a closer look at the turning point from acute to chronic Aβ-related neuroinflammation through formation of ASC-Aβ composites. Friker et al. investigate the reaction of primary microglia to exogenous ASC and ASC-Aβ composites. They uncover a vicious circle involving amplified NLRP3 inflammasome activity and reduced Aβ clearance in the presence of ASC that might play a key role in Alzheimer’s disease progression.
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