Activated microglia mitigate Aß-associated tau seeding and spreading.
J Exp Med
; 218(8)2021 08 02.
Article
em En
| MEDLINE
| ID: mdl-34100905
ABSTRACT
In Alzheimer's disease (AD) models, AD risk variants in the microglial-expressed TREM2 gene decrease Aß plaque-associated microgliosis and increase neuritic dystrophy as well as plaque-associated seeding and spreading of tau aggregates. Whether this Aß-enhanced tau seeding/spreading is due to loss of microglial function or a toxic gain of function in TREM2-deficient microglia is unclear. Depletion of microglia in mice with established brain amyloid has no effect on amyloid but results in less spine and neuronal loss. Microglial repopulation in aged mice improved cognitive and neuronal deficits. In the context of AD pathology, we asked whether microglial removal and repopulation decreased Aß-driven tau seeding and spreading. We show that both TREM2KO and microglial ablation dramatically enhance tau seeding and spreading around plaques. Interestingly, although repopulated microglia clustered around plaques, they had a reduction in disease-associated microglia (DAM) gene expression and elevated tau seeding/spreading. Together, these data suggest that TREM2-dependent activation of the DAM phenotype is essential in delaying Aß-induced pathological tau propagation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Peptídeos beta-Amiloides
/
Proteínas tau
/
Microglia
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
J Exp Med
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Macau