Alpha-synuclein-associated changes in PINK1-PRKN-mediated mitophagy are disease context dependent

Area of Science:

• Neuroscience
• Cell Biology
• Biochemistry

Background:

• Alpha-synuclein (αsyn) aggregates are hallmarks of neurodegenerative diseases like Parkinson's.
• Mitochondrial dysfunction and impaired autophagy are implicated in αsyn deposition, forming a potential vicious cycle.
• The PINK1-PRKN pathway tags damaged mitochondria for degradation via mitophagy.

Purpose of the Study:

• To investigate the interaction between αsyn and the PINK1-PRKN mitophagy pathway.
• To explore the role of αsyn in modulating mitochondrial quality control mechanisms.
• To assess the potential of pS65-Ub as a biomarker for synucleinopathies.

Main Methods:

• Utilized cell models, αsyn transgenic mice, and human postmortem brain tissue.
• Examined the effects of αsyn accumulation on PRKN levels and pS65-Ub signaling.
• Employed CRISPR/Cas9 gene editing and induced autophagy via starvation.

Main Results:

• Disease-associated αsyn multiplications led to PRKN accumulation, which was reversible by autophagy activation or αsyn knockout.
• Elevated PRKN enhanced the pS65-Ub response following mitochondrial damage.
• Increased pS65-Ub signals were observed in αsyn-overexpressing mouse brains and human synucleinopathy brains, correlating with Lewy body pathology.

Conclusions:

• αsyn interacts with the PINK1-PRKN pathway, influencing mitophagy.
• pS65-Ub may serve as a biomarker to differentiate synucleinopathies, particularly Lewy body diseases.
• Targeting pS65-Ub could be a therapeutic strategy for αsyn-related neurodegenerative disorders.