2,3,7,8-Tetrachlorodibenzo-p-dioxin inhibition of 17β-estradiol-induced increases in rat uterine epidermal growth factor receptor binding activity and gene expression

B. Astroff, C. Rowlands, R. Dickerson, S. Safe

Research output: Contribution to journalArticle

82 Scopus citations

Abstract

Treatment of immature female Sprague-Dawley rats with 17β-estradiol (5 μg/animal) resulted in an increase in uterine epidermal growth factor (EGF) receptor binding activity. Moreover, in a separate study it was also shown that 17β-estradiol increased steady-state levels of rat uterine EGF receptor mRNA as determined by Northern analysis. In contrast, 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) caused a dose-response decrease in constitutive rat uterine EGF receptor binding activity and this was paralleled by a decrease in steady-state levels of uterine EGF receptor mRNA. Cotreatment of the animals with both TCDD (16 nmol/kg) and 17β-estradiol (5 μg/rat) gave results which showed that TCDD significantly inhibited the estrogen-induced increases in rat uterine EGF receptor binding activity and EGF receptor mRNA levels. These results further extend the range of antiestrogenic properties of TCDD and suggest that the inhibition of growth factor expression may play a role in the growth-inhibiting properties of TCDD in estrogen-responsive tissues or cells.

Original languageEnglish (US)
Pages (from-to)247-252
Number of pages6
JournalMolecular and cellular endocrinology
Volume72
Issue number3
DOIs
StatePublished - Sep 10 1990

Keywords

  • 2,3,7,8-Ttetrachlorodibenzo-p-dioxin
  • Epidermal growth factor receptor binding
  • Gene expression

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Endocrinology

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