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Vulnerability of mitochondrial complex I in PC12 cells exposed to manganese
P Galvani1, P Fumagalli, A Santagostino
1Dipartimento di Scienze dell' Ambiente e del Territorio, Facoltà di Scienze, Università degli Studi di Milano, Italy.
Abstract:
The present findings provide experimental evidence for the hypothesis that an impairment of mitochondrial function may be involved in manganese neurotoxicity. Specifically, the treatment of dopaminergic neuronal-derived cell line (PC12) with MnCl2 produced a significant inhibition of some mitochondrial complexes of the respiratory chain, while in the glial-derived cell line (C6) this effect was not observed. In PC12 the decrease in complex I activity was more pronounce than in other mitochondrial complexes. However treatment of cells with ZnSO4 exerted no significant variations in enzymatic activities. A direct exposure of mitochondrial fraction to MnCl2 reduced enzymatic activities of mitochondria in both cell lines adding further support to the proposed theory that the different sensitivity of the cells to manganese may be explained by a difference in uptake or intracellular storage. These data indicate that manganese neurotoxicity could be the result of a direct effect just on complex I activity or due to a secondary effect of oxidative stress induced by an excess of this transition metal.
Insights
Manganese (MnCl2) impairs mitochondrial function in neuronal cells (PC12), but not glial cells (C6), suggesting a role in manganese neurotoxicity. This damage may stem from direct effects on mitochondrial complex I or oxidative stress.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Mitochondrial dysfunction is increasingly implicated in neurodegenerative diseases.
- Manganese is an essential trace element, but excessive exposure can lead to neurotoxicity.
Purpose of the Study:
- To investigate the role of mitochondrial dysfunction in manganese neurotoxicity.
- To compare the effects of manganese on mitochondrial function in neuronal and glial cell lines.
Main Methods:
- PC12 (dopaminergic neuronal) and C6 (glial) cell lines were treated with manganese chloride (MnCl2).
- Mitochondrial respiratory chain complex activities were measured.
- Mitochondrial fractions were directly exposed to MnCl2.
Main Results:
- MnCl2 significantly inhibited mitochondrial respiratory chain complexes in PC12 cells, particularly complex I.
- No significant inhibition was observed in C6 cells.
- Direct exposure of mitochondrial fractions to MnCl2 reduced enzymatic activities in both cell lines.
Conclusions:
- Manganese neurotoxicity may involve impaired mitochondrial function, especially in neuronal cells.
- Differential sensitivity between cell types could be due to variations in manganese uptake or storage.
- Manganese toxicity may result from direct complex I inhibition or secondary oxidative stress.