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The protective effects of glutathione against methylmercury cytotoxicity
L Kromidas1, L D Trombetta, I S Jamall
1Toxicology Program, College of Pharmacy, St. John's University, Jamaica, NY 11439.
Abstract:
Mouse neuroblastoma cells exposed to 2.5 and 5.0 microM methylmercury for 24 h appeared rounded with the loss of processes. Immunohistochemical staining directed against beta-tubulin revealed severe alterations in microtubular architecture. Non-membrane-bound condensation product was visualized ultrastructurally in the treated cells and appeared similar to what was seen histochemically. Reduced and oxidized glutathione levels suggest that methylmercury may manifest its deleterious effects via oxidation of tubulin sulfhydryls, and by alterations due to peroxidative injury. Cells exposed to methylmercury showed a decrease in glutathione peroxidase activity. Simultaneous administration of 10 mM glutathione with 2.5 and 5.0 microM methylmercury dramatically prevented cell injury.
Insights
Methylmercury damages mouse neuroblastoma cells by disrupting microtubule structure and causing oxidative stress. Supplementing with glutathione effectively protected cells from these toxic effects.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Methylmercury (MeHg) is a potent neurotoxin.
- Cellular mechanisms underlying MeHg toxicity are not fully understood.
- Microtubules are crucial for neuronal structure and function.
Purpose of the Study:
- To investigate the effects of methylmercury on mouse neuroblastoma cells.
- To elucidate the role of glutathione in mitigating methylmercury-induced cellular damage.
Main Methods:
- Exposure of mouse neuroblastoma cells to varying concentrations of methylmercury.
- Immunohistochemical staining for beta-tubulin to assess microtubular architecture.
- Ultrastructural analysis to visualize cellular changes.
- Measurement of reduced and oxidized glutathione levels.
- Assessment of glutathione peroxidase activity.
Main Results:
- Methylmercury exposure caused cell rounding and loss of processes.
- Severe alterations in microtubular architecture were observed.
- Non-membrane-bound condensation products formed in treated cells.
- Methylmercury exposure decreased glutathione peroxidase activity.
- Simultaneous administration of glutathione prevented methylmercury-induced cell injury.
Conclusions:
- Methylmercury induces neurotoxicity through microtubule disruption and oxidative stress.
- Glutathione plays a protective role against methylmercury toxicity.
- Glutathione may counteract methylmercury's effects by preventing tubulin sulfhydryl oxidation.