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Lipid peroxidation and cellular damage in extrahepatic tissues of bromobenzene-intoxicated mice
Abstract:
The mechanisms of bromobenzene toxicity in extrahepatic tissues of mice were studied. Kidney, lung, heart and brain were examined. As observed in this as well as in a previous report for the liver, bromobenzene intoxication caused a progressive decrease in the glutathione content of all the tissues examined. Cellular damage (as assessed by both biochemical determinations and histologic observations) appeared after 6 hours in the case of the kidney and the heart and after 15 hours in the case of the lung. Lipid peroxidation (as assessed by the tissue content of malonic dialdehyde, a parameter correlating with both the diene conjugation absorption and the amount of carbonyl functions in cellular phospholipids) was found to occur at the same times at which cellular damage was observed or even before. As in the case of bromobenzene-induced liver injury, when the individual values for cell damage obtained at 15-20 hours were plotted against the corresponding glutathione contents, a severe cellular damage was generally observed when the glutathione levels reached a threshold value (3.0-0.5 nmol/mg protein). Such a glutathione threshold was also observed for the onset of lipid peroxidation. Glutathione depletion and lipid peroxidation are therefore general phenomena occurring not only in the liver but in all the tissues as a consequence of bromobenzene poisoning. The possibility that lipid peroxidation is the cause of bromobenzene-induced damage to liver and extrahepatic tissues is discussed.
Insights
Bromobenzene toxicity causes glutathione depletion and lipid peroxidation in mouse kidneys, lungs, heart, and brain. These processes, linked to cellular damage, occur across multiple organs following bromobenzene poisoning.
Area of Science:
- Toxicology
- Biochemistry
- Pathology
Background:
- Bromobenzene is a known hepatotoxin.
- Previous studies focused on bromobenzene's liver toxicity.
- Extrahepatic tissue toxicity mechanisms remain less understood.
Purpose of the Study:
- To investigate the mechanisms of bromobenzene toxicity in extrahepatic tissues.
- To assess cellular damage and biochemical changes in kidney, lung, heart, and brain.
- To determine the role of glutathione depletion and lipid peroxidation in extrahepatic toxicity.
Main Methods:
- Mice were administered bromobenzene.
- Glutathione content was measured in kidney, lung, heart, and brain.
- Cellular damage was assessed via biochemical and histological methods.
- Lipid peroxidation was evaluated by measuring malonic dialdehyde levels.
Main Results:
- Bromobenzene intoxication progressively decreased glutathione levels in all examined tissues.
- Cellular damage was observed in kidneys and heart at 6 hours, and in lungs at 15 hours.
- Lipid peroxidation occurred concurrently with or before cellular damage.
- A glutathione threshold (3.0-0.5 nmol/mg protein) correlated with severe cellular damage and lipid peroxidation onset.
Conclusions:
- Glutathione depletion and lipid peroxidation are general mechanisms of bromobenzene toxicity, affecting both liver and extrahepatic tissues.
- Lipid peroxidation may be a causative factor in bromobenzene-induced cellular damage in multiple organs.
- These findings highlight the systemic nature of bromobenzene toxicity.