Regulation of glucocorticoid receptor expression: Evidence for transcriptional and posttranslational mechanisms

Yu Dong, Lorenz Poellinger, Jan-Ake Gustafsson, Sam Okret

Research output: Contribution to journalArticle

264 Scopus citations

Abstract

The mechanism of ligand-induced (homologous) down-regulation of the glucocorticoid receptor (GR) has been studied. Dexamethasone caused a down-regulation of the levels of GR mRNA and protein both in hepatoma tissue culture cells and rat liver in vivo. The decrease in the level of rat liver GR mRNA was due to a reduced transcription rate of the GR gene, as assessed by nuclear run-on transcription experiments. The half-life of GR mRNA in hepatoma tissue culture cells was determined to be approximately 4.5 h and was unaffected by dexamethasone. In addition to the transcriptional regulation of GR gene expression, a dexamethasone-dependent posttranslational modification in the rate of GR protein turnover was observed. In the absence of dexamethasone, GR protein half life was approximately 25 h whereas it decreased to approximately 11 h in the presence of hormone. Down-regulation of GR protein occurred with a 6- to 24-h delay as compared to the decline in GR mRNA. This is most likely due to the differences in half-lives of GR mRNA and protein, respectively. Our results suggest that autoregulation of GR by its cognate ligand is complex and occurs at both transcriptional and posttranslational levels.

Original languageEnglish (US)
Pages (from-to)1256-1264
Number of pages9
JournalMolecular Endocrinology
Volume2
Issue number12
DOIs
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Molecular Biology
  • Endocrinology

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