Alpha-Synuclein Preserves Mitochondrial Fusion and Function in Neuronal Cells

Area of Science:

• Neuroscience
• Cell Biology
• Mitochondrial Biology

Background:

• Mitochondrial dysregulation is linked to Parkinson's disease (PD).
• Alpha-synuclein (α-syn) aggregation is a hallmark of PD and may impact mitochondrial function.
• The precise role of α-syn in mitochondrial homeostasis is not fully understood.

Purpose of the Study:

• To investigate the role of α-syn in mitochondrial function and morphology.
• To analyze the impact of α-syn deficiency on mitochondrial-ER interactions.

Main Methods:

• Primary cortical neurons from α-syn null and wild-type mice were used.
• Mitochondrial respiration was measured using Seahorse XFe24.
• Morphology was assessed via Airyscan superresolution microscopy and Transmission Electron Microscopy (TEM).
• Protein expression related to mitochondrial dynamics was analyzed by real-time PCR and western blot.

Main Results:

• Neurons lacking α-syn exhibited reduced respiration capacity.
• Fragmented mitochondria and altered expression of mitochondrial dynamics proteins were observed in α-syn null neurons.
• Impaired physical interaction between mitochondria and endoplasmic reticulum (ER) was noted, with decreased mitochondria-ER contacts (MERCs) and increased MERC length.

Conclusions:

• Alpha-synuclein (α-syn) plays a physiological role in maintaining mitochondrial function and morphology.
• α-syn is important for proper mitochondria-ER interactions.
• Understanding the α-syn/mitochondria interplay is critical for PD and Lewy body disorder research.