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Alpha-Synuclein Toxicity on Protein Quality Control, Mitochondria and Endoplasmic Reticulum
Thaiany Quevedo Melo1,2, Sjef J C V M Copray2, Merari F R Ferrari3
1Departamento de Genética e Biologia Evolutiva, Instituto de Biociencias, Universidade de Sao Paulo, Rua do Matao, 277, Cidade Universitaria, 05508-090, Sao Paulo, SP, Brazil.
Neurochemical Research
|October 30, 2018
Summary
Parkinson's disease involves toxic alpha-synuclein protein aggregates that damage cellular organelles. This review explores how alpha-synuclein toxicity drives mitochondrial, ER, and autophagy dysfunction, leading to neurodegeneration.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Parkinson's disease (PD) is pathologically defined by insoluble protein aggregates, primarily alpha-synuclein.
- Alpha-synuclein toxicity is linked to increased reactive oxygen species (ROS) in aging brains and PD.
- Dysfunction of mitochondria, endoplasmic reticulum (ER), autophagy, and intracellular trafficking are implicated in PD pathogenesis.
Purpose of the Study:
- To review the role of alpha-synuclein as a cellular stressor in Parkinson's disease.
- To elucidate the mechanisms by which alpha-synuclein impairs key cellular organelles and dynamics.
- To connect alpha-synuclein-induced cellular stress to dopaminergic neuron loss and PD pathogenesis.
Main Methods:
- Literature review focusing on cellular mechanisms in Parkinson's disease.
- Analysis of studies investigating alpha-synuclein aggregation and toxicity.
- Examination of research on organelle dysfunction (mitochondria, ER, autophagy) in PD models.
Main Results:
- Alpha-synuclein aggregation contributes to oxidative stress and ROS elevation.
- Oxidative stress promotes protein oligomerization and aggregation, creating a damaging cycle.
- Alpha-synuclein impairs mitochondrial function, ER homeostasis, and autophagic clearance.
- These cellular insults disrupt intracellular trafficking and dynamics.
Conclusions:
- Alpha-synuclein dysfunction acts as a significant cellular stressor in Parkinson's disease.
- Impaired organelles and cellular dynamics contribute to a vicious cycle of damage.
- This cascade ultimately leads to dopaminergic neuron depletion and the characteristic pathology of PD.
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