Molecular mechanisms for bromotrichloromethane cytotoxicity in isolated rat hepatocytes
Xenobiotica, ISSN: 0049-8254, Vol: 20, Issue: 9, Page: 933-943
1990
- 11Citations
- 2Captures
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Metrics Details
- Citations11
- Citation Indexes11
- 11
- CrossRef6
- Captures2
- Readers2
Article Description
1. Bromotrichloromethane added to isolated rat hepatocytes resulted in increased cell death as determined by trypan blue uptake. Toxicity increased in a concentration-dependent fashion between 2.0-5.0 M bromotrichloromethane. 2. Lipid peroxidation (malondialdehyde) increased in a time-dependent fashion but in contrast to toxicity reached a maximum level at 2.0mM bromotrichloromethane. 3. Hypoxia increased the toxicity of bromotrichloromethane three-fold but only decreased the amount of lipid peroxidation to a small degree. 4. In spite of this poor correlation between toxicity and lipid peroxidation, the antioxidant butylated hydroxyanisole and the iron chelator desferal protected the cells from toxicity under both aerobic and hypoxic conditions and prevented lipid peroxidation. 5. During treatment with bromotrichloromethane, cellular glutathione levels slowly decreased and oxidized glutathione appeared in the media. The addition of cystine to the incubation media prevented the formation of extracellular oxidized glutathione, indicating that cellular glutathione had leaked from the cell during treatment and was oxidized in the incubation media. Although this suggested that glutathione does not play a protective role against bromotrichloromethane toxicity, diethyl maleate-pretreatment of the cells to decrease glutathione levels markedly increased bromotrichloromethane toxicity. 6. The addition of ascorbic acid to the incubation media increased bromotrichloromethane toxicity. This was attributed to the reductive activation of bromotrichloromethane in an iron and oxygen-dependent reaction. 7. It was concluded that peroxidation of essential phospholipids contributes to bromotrichloromethane-induced hepatocyte cytotoxicity. © 1990 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.
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