Polychlorinated biphenyl (PCB) congeners as 2,3,7,8-TCDD antagonists: Teratogenicity studies

L. Biegel, L. Howie, S. Safe

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Administration of 2,3,7,8-TCDD (20 μg/kg) to female C57BL/6 mice gave >60% cleft palate in the litters. Previous studies have shown that cotreatment of the pregnant mice with 2,3,7,8-TCDD (20 μg/kg) and Aroclor 1254 (750 μmol/kg) resulted in complete protection of the animals from cleft palate. In contrast, a lower dose of Aroclor 1254 (250 μmol/kg) was a less effective 2,3,7,8-TCDD antagonist. Several PCB congeners, including 2,2′,5,5′-tetrachlorobiphenyl and 2,2′,4,4′,5,5′-hexachlorobiphenyl, which exhibit some Ah receptor binding activity were investigated as 2,3,7,8-TCDD antagonists in the in vivo teratogenicity assay system. Both PCB congeners significantly protected the mice from 2,3,7,8-TCDD-mediated cleft palate. The significance of these results and their mechanistic implications will be discussed.

Original languageEnglish (US)
Pages (from-to)955-958
Number of pages4
Issue number1-6
StatePublished - 1989


  • 2,3,7,8-TCDD
  • PCB antagonists
  • teratogenicity

ASJC Scopus subject areas

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


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