ß-Amyloid Clustering around ASC Fibrils Boosts Its Toxicity in Microglia.
Cell Rep
; 30(11): 3743-3754.e6, 2020 03 17.
Article
em En
| MEDLINE
| ID: mdl-32187546
ABSTRACT
Alzheimer's disease is the world's most common neurodegenerative disorder. It is associated with neuroinflammation involving activation of microglia by ß-amyloid (Aß) deposits. Based on previous studies showing apoptosis-associated speck-like protein containing a CARD (ASC) binding and cross-seeding extracellular Aß, we investigate the propagation of ASC between primary microglia and the effects of ASC-Aß 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-Aß 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 Aß by microglia. Together, these data enable a closer look at the turning point from acute to chronic Aß-related neuroinflammation through formation of ASC-Aß composites.
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Base de dados:
MEDLINE
Assunto principal:
Peptídeos beta-Amiloides
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Microglia
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Proteínas Adaptadoras de Sinalização CARD
Limite:
Animals
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Humans
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article