Mitophagy Upregulation Occurs Early in the Neurodegenerative Process Mediated by α-Synuclein.
Abstract
Parkinson's disease (PD) is a progressive neurogenerative movement disorder characterized by dopaminergic cell death within the substantia nigra pars compacta (SNpc) due to the aggregation-prone protein α-synuclein. Accumulation of α-synuclein is implicated in mitochondrial dysfunction and disruption of the autophagic turnover of mitochondria, or mitophagy, which is an essential quality control mechanism proposed to preserve mitochondrial fidelity in response to aging and stress. Yet, the precise relationship between α-synuclein accumulation, mitochondrial autophagy, and dopaminergic cell loss remains unresolved. Here, we determine the kinetics of α-synuclein overexpression and mitophagy using the pH-sensitive fluorescent mito-QC reporter. We find that overexpression of mutant A53T α-synuclein in either human SH-SY5Y cells or rat primary cortical neurons induces mitophagy. Moreover, the accumulation of mutant A53T α-synuclein in the SNpc of rats results in mitophagy dysregulation that precedes the onset of dopaminergic neurodegeneration. This study reveals a role for mutant A53T α-synuclein in inducing mitochondrial dysfunction, which may be an early event contributing to neurodegeneration.
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Research summary
The paper investigates the role of α-synuclein in mitochondrial dysfunction and mitophagy, which are processes linked to neurodegeneration and aging. While it addresses mechanisms that could contribute to age-related diseases, it primarily focuses on the pathology of Parkinson's disease rather than directly targeting the root causes of aging or lifespan extension. The findings provide solid insights into the early events of neurodegeneration, but the impact on the broader field of longevity research is limited.
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