Individual Amino Acid Supplementation Can Improve Energy Metabolism and Decrease ROS Production in Neuronal Cells...

Area of Science:

• Neuroscience
• Biochemistry
• Cell Biology

Background:

• Parkinson's disease (PD) is linked to alpha-synuclein accumulation and dopaminergic neuron loss.
• Alpha-synuclein overexpression can impair mitochondrial function and increase reactive oxygen species (ROS).

Purpose of the Study:

• To investigate the bioenergetic and oxidative stress consequences of alpha-synuclein overexpression in neuronal cells.
• To explore the potential of metabolite supplementation to counteract alpha-synuclein-induced cellular damage.

Main Methods:

• Stable overexpression of wild-type alpha-synuclein in human neuroblastoma cells (BE(2)-M17).
• Assessment of oxygen consumption, ATP levels, and ROS production.
• Exposure to ROS generators (ferrous sulfate, paraquat) and various metabolite supplements.
• Proteomic analysis to identify cellular adaptations.

Main Results:

• Alpha-synuclein overexpression increased alpha-synuclein multimers but not monomers, decreased oxygen consumption, but did not initially alter ATP or ROS levels.
• Overexpressing cells showed increased sensitivity to oxidative stress, with reduced ATP and increased ROS upon treatment with ferrous sulfate or paraquat.
• Proteomic analysis revealed increased mitochondrial proteins; specific amino acid (L-serine, L-proline, L-aspartate, L-glutamine) supplementation reduced ROS, while diethyl oxaloacetate or L-valine increased ATP.

Conclusions:

• Alpha-synuclein overexpression sensitizes neuronal cells to oxidative stress and impacts cellular bioenergetics.
• Dietary supplementation with specific metabolites may offer a therapeutic strategy to improve energy metabolism and mitigate oxidative damage in Parkinson's disease.