Nuclear alpha-synuclein accelerates cell senescence and neurodegeneration

Area of Science:

• Neuroscience
• Molecular Biology
• Aging Research

Background:

• Parkinson's disease (PD) progression is linked to aging.
• The role of nuclear alpha-synuclein (α-syn) in PD pathogenesis is unclear.
• Nuclear α-syn accumulation may accelerate neurodegenerative diseases.

Purpose of the Study:

• To investigate the role of nuclear α-syn in Parkinson's disease.
• To determine if nuclear α-syn exacerbates PD-like phenotypes.

Main Methods:

• Constructed an adeno-associated virus (AAV) vector to target α-syn expression to the nucleus.
• Utilized virus-mediated gene transfer in a mouse model.
• Performed behavioral tests, RNA-Seq, immunohistochemistry, Western blotting, and qPCR.

Main Results:

• Nuclear α-syn increased PD-like phenotype severity, including dopaminergic neuron loss and motor impairment.
• Nuclear α-syn inclusions contained high molecular weight species and induced transcriptional dysregulation (p21, SASP genes).
• Transcriptional changes correlated with gliosis, inflammation, oxidative/DNA damage, lysosomal dysfunction, accelerating neurodegeneration.

Conclusions:

• Nuclear α-syn plays a critical role in Parkinson's disease pathogenesis.
• Nuclear α-syn exacerbates neuroinflammation and cellular damage pathways.
• Targeting nuclear α-syn may offer therapeutic potential for PD.