Nuclear alpha-synuclein accelerates cell senescence and neurodegeneration.
Immun Ageing
; 21(1): 47, 2024 Jul 12.
Article
in En
| MEDLINE
| ID: mdl-38997709
ABSTRACT
BACKGROUND:
The progression of Parkinson's disease (PD) is related to ageing. The accumulation of nuclear alpha-synuclein (α-syn) may accelerate the occurrence of neurodegenerative diseases, but its role in PD remains poorly understood.METHODS:
In the present study, α-syn expression was specifically targeted to the nucleus by constructing an adeno-associated virus (AAV) vector in which a nuclear localization sequence (NLS) was added to the α-syn coding sequence. Virus-mediated gene transfer, behavioural tests, RNA-Seq, immunohistochemistry, western blotting, and quantitative real-time PCR were then performed.RESULTS:
In vivo experiments using a mouse model showed that nuclear α-syn increased the severity of the PD-like phenotype, including the loss of dopaminergic neurons concomitant with motor impairment and the formation of α-syn inclusions. These nuclear inclusions contained α-syn species of high molecular weights and induced strong transcriptional dysregulation, especially induced high expression of p21 and senescence-associated secretory phenotype (SASP)-related genes. In addition, the transcriptional alterations induced by nuclear α-syn were associated with gliosis, inflammation, oxidative and DNA damage, and lysosomal dysfunction, and they eventually accelerated neuronal loss and neurodegeneration.CONCLUSIONS:
Our results suggest that nuclear α-syn plays a crucial role in PD pathogenesis.
Full text:
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Immun Ageing
Year:
2024
Document type:
Article
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