Proteolytic α-Synuclein Cleavage in Health and Disease

Area of Science:

• Neuroscience
• Biochemistry
• Pathology

Background:

• Alpha-synuclein aggregation in Lewy bodies is a hallmark of Parkinson's disease.
• Mechanisms driving alpha-synuclein aggregation, including oxidative stress and post-translational modifications, are not fully understood.
• Proteolytic cleavage generates alpha-synuclein fragments with altered properties.

Purpose of the Study:

• To review current knowledge on the proteolytic cleavage of alpha-synuclein by specific proteases.
• To explore the role of these enzymes in both healthy and diseased states.
• To investigate potential shared mechanisms in pathogenic protein aggregation across neurodegenerative diseases.

Main Methods:

• Literature review focusing on proteases like neurosin, calpain-1, cathepsin D, and matrix metalloproteinase-3.
• Analysis of studies investigating alpha-synuclein cleavage and its consequences.
• Examination of research on pathogenic protein processing in Alzheimer's disease.

Main Results:

• Specific proteases (neurosin, calpain-1, cathepsin D, MMP-3) cleave alpha-synuclein.
• This cleavage produces various fragments with incompletely understood functions.
• These enzymes also process pathogenic proteins in Alzheimer's disease.

Conclusions:

• Proteolytic processing is a key factor influencing alpha-synuclein pathology.
• Understanding these enzymatic activities offers insights into Parkinson's disease.
• Cross-disease mechanisms in protein aggregation may exist, particularly between Parkinson's and Alzheimer's diseases.