Promoter-dependent synergy between glucocorticoid receptor and Stat5 in the activation of β-casein gene transcription

Judith Lechner, Thomas Welte, Jürgen K. Tomasi, Patrick Bruno, Carol Cairns, Jan Åke Gustafsson, Wolfgang Doppler

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

Steroid hormone receptors and Stat factors comprise two distinct families of inducible transcription factors. Activation of a member of each family, namely the glucocorticoid receptor by glucocorticoids and Stat5 by prolactin, is required for the efficient induction of the expression of milk protein genes in the mammary epithelium. We have studied the mode of interaction between Stat5 and the glucocorticoid receptor in the activation of β-casein gene transcription. The functional role of potential half- palindromic glucocorticoid receptor-binding sites mapped previously in the promoter region was investigated. β-Casein gene promotor chloramphenicol acetyltransferase constructs containing mutations and deletions in these sites were tested for their responsiveness to the synergistic effect of prolactin and dexamethasone employing COS-7 cells or HC11 mammary epithelial cells. Synergism depended on promoter regions containing intact binding sites for the glucocorticoid receptor and Stat5. The carboxyl-terminal transactivation domains of Stat5a and Stat5b were not required for this synergism. Our results suggest that in lactogenic hormone response elements glucocorticoid receptor molecules bound to nonclassical half-palindromic sites gain competence as transcriptional activators by the interaction with Stat5 molecules binding to vicinal sites.

Original languageEnglish (US)
Pages (from-to)20954-20960
Number of pages7
JournalJournal of Biological Chemistry
Volume272
Issue number33
DOIs
StatePublished - Aug 15 1997

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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