Lysosomal Dysfunction and α-Synuclein Aggregation in Parkinson's Disease: Diagnostic Links

Area of Science:

• Neuroscience
• Biochemistry
• Genetics

Background:

• Lysosomal impairment is increasingly recognized in Parkinson's disease (PD) pathophysiology.
• Genetic links between lysosomal storage disorders and PD suggest shared risk factors and mechanisms.
• The autophagy-lysosomal system's role in protein hydrolysis suggests lysosomal dysfunction contributes to alpha-synuclein aggregation in PD.

Purpose of the Study:

• To review evidence linking lysosomal dysfunction and alpha-synuclein aggregation in PD.
• To explore the potential of lysosomal proteins as diagnostic biomarkers for PD.

Main Methods:

• Review of existing literature on lysosomal function, PD pathophysiology, and alpha-synuclein.
• Analysis of studies investigating lysosomal enzyme levels in PD patients' brain tissue and cerebrospinal fluid (CSF).

Main Results:

• Reduced glucocerebrosidase and cathepsin levels are observed in PD brains.
• Altered lysosomal enzyme activities are detected in the CSF of PD patients, but alone, they do not reliably discriminate PD from controls.
• Lysosomal proteins in CSF may offer insights into PD, but require combination with other markers for accurate diagnosis.

Conclusions:

• Lysosomal dysfunction is closely linked to alpha-synuclein aggregation in PD.
• CSF lysosomal proteins show potential as biomarkers, but further research is needed.
• Combining CSF lysosomal markers with other pathological indicators may improve PD diagnosis and monitoring of disease progression.