Brain lipid peroxidation and changes of trace metals in rats following chronic manganese chloride exposure
Min-Tzu Chen1, Shuenn-Jiun Yiin, Jenn-Yuan Sheu
1Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Taiwan, Republic of China.
Abstract:
The aim of this study was to investigate the effects of chronic, daily, 30-d administration of manganese chloride (MnCl2) to male Sprague-Dawley rats on lipid peroxidation and changes of trace elements (manganese, iron, copper, zinc) in various brain regions. Rats were intraperitoneally injected with MnCl2 (20 mg/kg) once daily for 30 consecutive days. The Mn accumulated in frontal cortex, corpus callosum, hippocampus, striatum, hypothalamus, medulla, cerebellum, and spinal cord. Malondialdehyde, an end product of lipid peroxidation, was markedly decreased in frontal cortex and cerebellum. An increased level of Cu was observed in frontal cortex, medulla, and a cerebellum. A decreased Fe level was found only in cerebellum, and a decreased Zn level was observed in hippocampus and striatum. In a second group of animals, Mn (20 mg/kg/d) and glutathione (GSH, 15 mg/kg/d) were administered ip for 30 d. In CSH-Mn-treated rats, compared to Mn-treated rats, MDA concentrations were significantly reduced in frontal cortex, medulla and cerebellum. The changes of trace elements in rat brain were similar to the Mn-treated group. We suggest that Mn is an atypical antioxidant, as well as not involved in oxidative damage in rat brain. Fe and Cu may play roles in the protective effect of Mn against lipid peroxidation in rat brain.
Insights
Manganese chloride administration in rats showed it acts as an atypical antioxidant, reducing lipid peroxidation in the brain. Iron and copper may contribute to manganese's protective effects against oxidative damage.
Area of Science:
- Neuroscience
- Toxicology
- Biochemistry
Background:
- Chronic exposure to manganese chloride (MnCl2) can impact brain function.
- Understanding the effects of manganese on lipid peroxidation and trace element balance is crucial for neuroprotection.
Purpose of the Study:
- To investigate the effects of chronic manganese chloride administration on lipid peroxidation and trace element levels in rat brain regions.
- To explore the potential role of glutathione in mitigating manganese-induced oxidative stress.
Main Methods:
- Male Sprague-Dawley rats received daily intraperitoneal injections of MnCl2 (20 mg/kg) for 30 days.
- Trace element analysis and malondialdehyde (MDA) levels were measured in various brain regions.
- A separate group received both MnCl2 and glutathione (GSH) to assess GSH's protective effects.
Main Results:
- Manganese accumulated in multiple brain regions, including the frontal cortex, hippocampus, and cerebellum.
- Malondialdehyde levels, an indicator of lipid peroxidation, decreased in the frontal cortex and cerebellum.
- Iron and copper levels showed region-specific changes, with decreased iron in the cerebellum and increased copper in the frontal cortex, medulla, and cerebellum.
- Glutathione co-administration further reduced MDA levels in specific brain areas.
Conclusions:
- Manganese acts as an atypical antioxidant, not directly involved in causing oxidative damage in the rat brain.
- Iron and copper may play a role in manganese's protective effects against lipid peroxidation.
- Further research is warranted to elucidate the precise mechanisms of manganese's antioxidant activity and its interaction with other trace elements.