Alpha-synuclein at the intracellular and the extracellular side: functional and dysfunctional implications

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Alpha-synuclein (α-syn) is a neuronal protein crucial for synaptic function.
• Misfolding and aggregation of α-syn cause synucleinopathies like Parkinson's disease (PD), forming Lewy bodies (LB).
• Proteostasis stress and oligomeric α-syn species are implicated in cytotoxicity.

Purpose of the Study:

• To review the multifaceted roles of α-syn in neuronal biology.
• To explore the mechanisms by which α-syn contributes to neurodegeneration.
• To discuss hypotheses linking α-syn to disease pathogenesis.

Main Methods:

• Literature review of α-synuclein biology.
• Analysis of studies on α-syn aggregation and cytotoxicity.
• Examination of α-syn's interaction with cellular pathways.

Main Results:

• Oligomeric α-syn species are associated with cytotoxicity.
• α-syn disrupts membrane permeability, mitochondrial function, and autophagy.
• Genetic mutations in α-syn are linked to autosomal dominant PD.

Conclusions:

• α-syn plays a complex role in neuronal function and dysfunction.
• Interference with signaling pathways, mitochondrial integrity, and proteostasis are key mechanisms of α-syn toxicity.
• Understanding α-syn biology is critical for developing therapies for synucleinopathies.