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Effect of manganese chloride exposure on liver and brain mitochondria function in rats
Surong Zhang1, Zongcan Zhou, Juanling Fu
1Department of Toxicology, School of Public Health, Peking University Health Science Center, Beijing 100083, China. zhangsurong@yahoo.com.cn
Abstract:
Manganese (Mn) is an essential trace element found in many enzymes. As is the case for many essential trace elements, excessive Mn is toxic. Individuals suffering from manganese toxicity exhibit several symptoms, which are similar to those frequently observed in cases of Parkinson's disease. In this investigation, we studied the effect of manganese chloride (7.5, 15.0, and 30.0 mg/kg body weight) on mitochondrial function and attempted to ascertain the mechanism of manganese-induced mitochondrial dysfunction. The production of reactive oxygen species in mitochondria of rat liver and brain was assayed using 2',7'-dichlorofluorescin diacetate, and the activities of respiratory chain enzymes were examined spectrophotometrically. Monoamine oxidase (MAO) activity was assayed by measuring reduction of benzylamine. Manganese and calcium content in mitochondria were determined by atomic absorption spectrophotometry. These results indicate that manganese chloride (MnCl2) can decrease MAO activity and inhibit the respiratory chain. Manganese can accumulate in mitochondria and inhibit efflux of calcium. There is a significant inverse correlation between the amount of superoxide radicals and the specific activities of the mitochondria enzymes. Mitochondrial function was significantly affected in both males and females.
Insights
Excessive manganese (Mn) exposure impairs mitochondrial function by decreasing monoamine oxidase (MAO) activity and inhibiting the respiratory chain, leading to toxicity similar to Parkinson's disease.
Area of Science:
- Biochemistry
- Neuroscience
- Toxicology
Background:
- Manganese (Mn) is an essential trace element, but excessive levels can cause toxicity.
- Manganese toxicity symptoms resemble those of Parkinson's disease.
- Mitochondrial dysfunction is implicated in neurodegenerative disorders.
Purpose of the Study:
- To investigate the effects of manganese chloride on mitochondrial function.
- To elucidate the mechanism of manganese-induced mitochondrial dysfunction.
- To assess the impact on reactive oxygen species production and enzyme activities.
Main Methods:
- Assay of reactive oxygen species production in rat liver and brain mitochondria.
- Spectrophotometric examination of respiratory chain enzyme activities.
- Assay of monoamine oxidase (MAO) activity.
- Atomic absorption spectrophotometry for manganese and calcium content.
- Administration of varying doses of manganese chloride (7.5, 15.0, 30.0 mg/kg).
Main Results:
- Manganese chloride decreased MAO activity and inhibited the respiratory chain.
- Manganese accumulated in mitochondria, inhibiting calcium efflux.
- Increased superoxide radical production correlated inversely with mitochondrial enzyme activities.
- Mitochondrial function was significantly impaired in both male and female rats.
Conclusions:
- Manganese exposure induces mitochondrial dysfunction through inhibition of key enzymes and disruption of calcium homeostasis.
- The findings provide insights into the molecular mechanisms underlying manganese toxicity and its link to Parkinson's-like symptoms.
- Manganese-induced mitochondrial impairment affects both sexes, highlighting a potential widespread health risk.
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