Calcium: Alpha-Synuclein Interactions in Alpha-Synucleinopathies

Area of Science:

• Neuroscience
• Biochemistry
• Pathology

Background:

• Alpha-synuclein (α-syn) aggregation is central to Parkinson's disease (PD) and related synucleinopathies.
• Elevated neuronal calcium and oxidative stress are implicated as key triggers for pathological α-syn aggregation.
• Calbindin-D28k, a calcium-buffering protein, has emerged as a potential protective factor against α-syn pathology.

Approach:

• This review synthesizes findings from human tissue studies and mouse models.
• It examines cell culture data on calcium channel activity and α-syn aggregation.
• The interplay between calcium, oxidative stress, and α-syn aggregation is analyzed.

Key Points:

• Neuronal calbindin-D28k expression correlates with the exclusion of α-syn inclusion bodies.
• Transient increases in intracellular free calcium can induce cytoplasmic α-syn aggregation.
• Cooperative effects of elevated intracellular calcium and oxidative stress accelerate α-syn aggregation.

Conclusions:

• The review highlights the critical association between increased neuronal calcium, α-syn aggregation, oxidative stress, and neurotoxicity in PD.
• It underscores the potential of targeting these mechanisms for novel therapeutic strategies in neurodegenerative α-syn diseases.