Title: The bioactivation of 1,2-dibromoethane in rat hepatocytes: deuterium isotope effect.

Authors: White, R D; Petry, T W; Sipes, I G

Published In Chem Biol Interact, (1984 Apr)

Abstract: The metabolism and genotoxicity of 1,2-dibromoethane (EDB) and its deuterium substituted analog ( d4EDB ) were studied in isolated rat hepatocytes. There was a marked isotope effect on the metabolism of EDB by hepatocytes. This was due to decreased microsomal oxidation of d4EDB . Cytosolic metabolism of EDB, as measured by bromide ion release, was unaffected by deuterium substitution. The genotoxicity of the two analogs was assessed by assaying for the presence of EDB induced single-strand breaks in DNA. As measured by the alkaline elution technique, both compounds caused DNA single-strand breaks when incubated at a concentration of 0.1 mM with hepatocytes. No difference in the degree of DNA damage could be demonstrated between hepatocytes incubated with EDB or d4EDB . These data suggest that the GSH transferase mediated metabolism of EDB is responsible for the genotoxic effects of EDB observed in hepatocytes.

PubMed ID: 6373030

MeSH Terms: Animals; Bromides/metabolism; Cytochrome P-450 Enzyme System/metabolism; Cytosol/enzymology; DNA/antagonists & inhibitors*; Deuterium*; Ethylene Dibromide/metabolism*; Ethylene Dibromide/toxicity; Glutathione Transferase/metabolism; Hydrocarbons, Brominated/metabolism*; Liver/metabolism*; Male; Microsomes, Liver/enzymology*; Mixed Function Oxygenases/metabolism; Rats; Rats, Inbred Strains