Immunohistochemical Study of ASC Expression and Distribution in the Hippocampus of an Aged Murine Model of Alzheimer's Disease.
Int J Mol Sci
; 22(16)2021 Aug 13.
Article
em En
| MEDLINE
| ID: mdl-34445402
ABSTRACT
Neuroinflammation is involved in the pathogenesis of neurodegenerative diseases such as Alzheimer's disease (AD), and is notably dependent on age. One important inflammatory pathway exerted by innate immune cells of the nervous system in response to danger signals is mediated by inflammasomes (IF) and leads to the generation of potent pro-inflammatory cytokines. The protein "apoptosis-associated speck-like protein containing a caspase recruitment domain" (ASC) modulates IF activation but has also other functions which are crucial in AD. We intended to characterize immunohistochemically ASC and pattern recognition receptors (PRR) of IF in the hippocampus (HP) of the transgenic mouse model Tg2576 (APP), in which amyloid-beta (Aß) pathology is directly dependent on age. We show in old-aged APP a significant amount of ASC in microglia and astrocytes associated withAß plaques, in the absence of PRR described by others in glial cells. In addition, APP developed foci with clusters of extracellular ASC granules not spatiallyrelated to Aß plaques, which density correlated with the advanced age of mice and AD development. Clusters were associated withspecific astrocytes characterized by their enlarged ring-shaped process terminals, ASC content, and frequent perivascular location. Their possible implication in ASC clearance and propagation of inflammation is discussed.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Precursor de Proteína beta-Amiloide
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Proteínas Adaptadoras de Sinalização CARD
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Doença de Alzheimer
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Hipocampo
Limite:
Animals
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Humans
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Male
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article