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Covalent binding of hexachlorobutadiene metabolites to renal and hepatic mitochondrial DNA

D Schrenk1, W Dekant

  • 1Institut für Toxikologie, Universität-Würzburg, FRG.

Carcinogenesis
|June 1, 1989
PubMed

Insights

Hexachlorobutadiene (HCBD) metabolites bind to mouse DNA, particularly mitochondrial DNA in the kidney. This DNA binding suggests genotoxic mechanisms may initiate HCBD-induced kidney cancer.

Area of Science:

  • Toxicology
  • Molecular Biology
  • Carcinogenesis

Background:

  • Hexachlorobutadiene (HCBD) is an industrial chemical with known toxicity.
  • Understanding the molecular mechanisms of HCBD toxicity is crucial for risk assessment.

Purpose of the Study:

  • To investigate the covalent binding of [14C]hexachlorobutadiene (HCBD) metabolites to nuclear DNA (nDNA) and mitochondrial DNA (mtDNA) in mouse liver and kidney.
  • To explore the potential genotoxic mechanisms underlying HCBD-induced nephrocarcinogenesis.

Main Methods:

  • Administration of a single oral dose of [14C]HCBD (30 mg/kg) to mice.
  • Quantification of radioactivity in isolated nDNA and mtDNA from liver and kidney.
  • Enzymatic hydrolysis and HPLC fractionation of mtDNA to identify bound metabolites.

Main Results:

  • Low binding of HCBD metabolites to kidney nDNA (CBI = 27), with minimal binding to liver nDNA.
  • Significant binding of HCBD metabolites to liver mtDNA (CBI = 500) and kidney mtDNA (CBI = 7500).
  • Identification of three radioactive compounds in kidney mtDNA, suggesting altered DNA bases.

Conclusions:

  • HCBD metabolites exhibit significant covalent binding to mtDNA in mouse liver and kidney.
  • The observed DNA binding in vivo supports the hypothesis that genotoxic mechanisms are involved in HCBD nephrocarcinogenesis.

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