Glucocorticoid repression of the mouse gonadotropin-releasing hormone gene is mediated by promoter elements that are recognized by heteromeric complexes containing glucocorticoid receptor

Uma R. Chandran, Barbara Attardi, Robert Friedman, Zhou Wen Zheng, James L. Roberts, Donald B. DeFranco

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

We have identified two regions of the mouse gonadotropin-releasing hormone (GnRH) promoter, one between -237 and -201 (distal element) and the other between -184 and -150 (proximal element), which are required for glucocorticoid repression in transiently transfected GT1-7 cells. These sequences show no similarity to known positive or negative glucocorticoid response elements (nGREs) and do not function when placed upstream of heterologous viral promoters. The glucocorticoid receptor (GR) does not bind directly to the distal or proximal promoter elements but may participate in glucocorticoid repression of GnRH gene transcription by virtue of its association within multiprotein complexes at these nGREs. Electrophoretic mobility shift assays with GT1-7 nuclear extract demonstrate the presence of GR-containing protein complexes on GnRH nGREs. One protein that co-occupies the distal nGRE in vitro along with GR is the POU domain transcription factor Oct-1. Thus, the tethering of GR to the GnRH distal nGRE, by virtue of a direct or indirect association with DNA-bound Oct-1, could play a role in hormone-dependent transcriptional repression of the GnRH gene. In contrast, Oct-1 does not appear to be a component of the GR-containing protein complex that is bound to the proximal nGRE.

Original languageEnglish (US)
Pages (from-to)20412-20420
Number of pages9
JournalJournal of Biological Chemistry
Volume271
Issue number34
DOIs
Publication statusPublished - Sep 5 1996

    Fingerprint

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this