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Updated: Aug 29, 2026
Histological Examination of Mitochondrial Morphology in a Parkinson's Disease Model
Published on: June 23, 2023
alpha-Synuclein selectively increases manganese-induced viability loss in SK-N-MC neuroblastoma cells expressing the
Christian Pifl1, Maya Khorchide, Alexandra Kattinger
1Brain Research Institute, University of Vienna, Spitalgasse 4, A-1090 Vienna, Austria. christian.pifl@univie.ac.at
Abstract:
The established or potentially toxic agents implicated in the nigral cell death in Parkinson's disease, dopamine, 1-methyl-4-phenylpyridinium (MPP(+)), iron, and manganese, were examined as to their effects on the viability of cells overexpressing alpha-synuclein. SK-N-MC neuroblastoma cells stably expressing the human dopamine transporter were transfected with human alpha-synuclein and cell clones with and without alpha-synuclein immunoreactivity were obtained. Cells were exposed for 24-72 h to 1-10 microM dopamine, 0.1-3 microM MPP(+), 0.1-1 mM FeCl(2) or 30-300 microM MnCl(2) added to the culture medium. There was no difference between cells expressing alpha-synuclein and control cells after exposure to dopamine, MPP(+) or FeCl(2). However, MnCl(2) resulted in a significantly stronger decreased viability of cells overexpressing alpha-synuclein after 72 h. These findings suggest that manganese may co-operate with alpha-synuclein in triggering neuronal cell death such as seen in manganese parkinsonism. The relevance of our observations for the pathoetiology of Parkinson's disease proper remains to be determined.
Insights
Manganese exposure significantly reduced the viability of cells overexpressing alpha-synuclein, suggesting a role in neurodegeneration. This finding may inform research into Parkinson's disease and manganese parkinsonism.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Parkinson's disease involves nigral cell death.
- Dopamine, MPP(+), iron, and manganese are implicated toxins.
- Alpha-synuclein is a key protein in Parkinson's disease pathology.
Purpose of the Study:
- To investigate the combined effects of toxic agents and alpha-synuclein overexpression on neuronal cell viability.
- To determine if manganese exacerbates alpha-synuclein-induced toxicity.
Main Methods:
- SK-N-MC neuroblastoma cells expressing the human dopamine transporter were used.
- Cells were transfected with human alpha-synuclein.
- Cell clones with and without alpha-synuclein were exposed to dopamine, MPP(+), iron (FeCl2), or manganese (MnCl2).
- Cell viability was assessed after 24-72 hours.
Main Results:
- Dopamine, MPP(+), and FeCl2 did not alter cell viability differently between alpha-synuclein expressing and control cells.
- MnCl2 exposure significantly decreased the viability of cells overexpressing alpha-synuclein after 72 hours.
- No significant difference was observed for iron exposure.
Conclusions:
- Manganese may cooperate with alpha-synuclein to induce neuronal cell death.
- Findings suggest a potential mechanism contributing to manganese parkinsonism.
- Further research is needed to clarify the relevance for Parkinson's disease proper.
