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Published on: September 28, 2019
α-Synuclein amino terminus regulates mitochondrial membrane permeability
Jiamei Shen1, Tingting Du1, Xue Wang1
1Center for Parkinson׳s Disease, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Diseases of the Ministry of Education, Department of Neurobiology Capital Medical University, Beijing 100069, China.
The N terminus of alpha-synuclein (α-Syn/N) triggers mitochondrial dysfunction and cell death in Parkinson's disease models. Inhibiting the adenine nucleotide translocator partially reversed these toxic effects.
Area of Science:
- Neuroscience
- Mitochondrial Biology
- Neurodegenerative Diseases
Background:
- Parkinson's disease (PD) involves mitochondrial dysfunction and protein aggregation.
- The role of the alpha-synuclein (α-Syn) N-terminus in mitochondrial function is unclear.
- Mitochondrial dysfunction is a key factor in PD pathogenesis.
Purpose of the Study:
- To functionally characterize the α-Syn N-terminal domain.
- To investigate the effect of α-Syn/N on mitochondrial membrane permeability.
- To explore the role of α-Syn in PD neurodegeneration.
Main Methods:
- Overexpression of α-Syn/N and α-Syn/delN constructs in dopaminergic cells and neurons.
- Assessment of cell viability, reactive oxygen species levels, and mitochondrial morphology.
- Analysis of mitochondrial membrane potential, cardiolipin content, and protein interactions (VDAC, ANT).
- Pharmacological inhibition of adenine nucleotide translocator (ANT) using bongkrekic acid (BKA).
Main Results:
- α-Syn/N overexpression reduced cell viability and increased reactive oxygen species.
- α-Syn/N altered mitochondrial morphology and decreased mitochondrial membrane potential.
- Activation of mitochondrial permeability transition pores (mPTP) was observed, linked to ANT and VDAC interaction.
- BKA treatment partially reversed cell death and reduced α-Syn/N interaction with ANT and VDAC.
Conclusions:
- The α-Syn N-terminus is critical for regulating mitochondrial membrane permeability.
- α-Syn interaction with ANT promotes mPTP activation and contributes to neurotoxicity in PD.
- Targeting ANT may offer a therapeutic strategy for PD.
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