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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Covalent interaction of 3,3'-dichlorobenzidine with hepatic lipids. Enzymic basis and stability of the adducts.

Administration of a single oral dose (20 mg/kg) of [U-14C]3,3'-dichlorobenzidine to rats resulted in the in vivo covalent binding of the compound to hepatic lipids. More than 70% of the lipid-3,3'-dichlorobenzidine adducts were accounted for in microsomes. Loss of the lipid-bound 3,3'-dichlorobenzidine residues from either total liver or endoplasmic reticulum occurred in at least two phases--an initial fast phase and a terminal slow phase. In vitro studies with hepatic microsomes in the presence of antibodies to specific P450 isozymes and chemical inhibitors to determine the enzymes that activate 3,3'-dichlorobenzidine to the lipid-binding derivative(s) implicated cytochrome P450d. The 3,3'-dichlorobenzidine-bound microsomal lipids were not mutagenic to Salmonella TA98 in the Ames test. The results suggest that adduct formation between 3,3'-dichlorobenzidine and membrane lipids may provide a measure of 3,3'-dichlorobenzidine activation. It is speculated that covalent interaction of the compound with membrane lipids may modify cellular processes, leading to either enhancement or attenuation of carcinogenesis by the chemical.[1]

References

  1. Covalent interaction of 3,3'-dichlorobenzidine with hepatic lipids. Enzymic basis and stability of the adducts. Iba, M.M., Lang, B., Thomas, P.E., Ghosal, A. Biochem. Pharmacol. (1990) [Pubmed]
 
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