6-Methyl-1,3,8-trichlorodibenzofuran (MCDF) as a 2,3,7,8-TCDD antagonist in C57BL/6 mice

R. Bannister, D. Davis, L. Biegel, B. Astroff, S. Safe

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


MCDF exhibits moderate affinity for the Ah receptor in both mice and rats; however, it is only a weak Ah receptor agonist in both species. In contrast, to previous studies in rats, MCDF was a relatively poor antagonist of TCDD-induced monooxygenase activities in mice, and over a dose range of 10-500 μmol/kg, significant inhibition was observed only at a dose of 50 μol/kg. These dose-response interactive studies in C57BL/6 mice showed that MCDF significantly antagonized the TCDD-mediated induction of hepatic microsomal aryl hydrocarbon hydroxylase (AHH), 14% inhibition, and ethoxyresorufin-O-deethylase (EROD), 17% inhibition. MCDF was also a weak agonist for teratogenicity (cleft palate) and immunotoxicity (inhibition of the plaque-forming cell response to sheep erythrocytes) in C57BL/6 mice. Cotreatment of mice with an effective dose of 2,3,7,8-TCDD (ED70-100) and a subeffective dose of MCDF demonstrated that MCDF significantly antagonized 2,3,7,8-TCDD-induced teratogenicity and immunotoxicity in the mice.

Original languageEnglish (US)
Pages (from-to)949-953
Number of pages5
Issue number1-6
StatePublished - 1989


  • 2,3,7,8-TCDD antagonist
  • C57BL/6 mice
  • MCDF

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis


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