Journal
MOLECULAR AND CELLULAR ENDOCRINOLOGY
Volume 275, Issue 1-2, Pages 13-29Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mce.2007.07.003
Keywords
glucocorticoid receptor; crosstalk; transcription; trans-repression; AP-1; NF-kappa B
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Glucocorticoids (GCs) regulate cell fate by altering gene expression via the glucocorticoid receptor (GR). Ligand-bound GR can activate the transcription of genes carrying the specific GR binding sequence, the glucocorticoid response element (GRE). In addition, GR can modulate, positively or negatively, directly or indirectly, the activity of other transcription factors (TFs), a process referred to as crosstalk. In the indirect crosstalk, GR interferes with transduction pathways upstream of other TFs. In the direct crosstalk, GR and other TFs modulate each other's activity when bound to the promoters of their target genes. The multiplicity of molecular actions exerted by TFs, particularly the GR, is not only fascinating in terms of molecular structure, it also implies that the TFs participate in a wide range of regulatory processes, broader than anticipated. This review focuses on the molecular mechanisms involved in the crosstalk, on both current ideas and unresolved questions, and discusses the possible significance of the crosstalk for the physiologic and therapeutic actions of GCs. (c) 2007 Elsevier Ireland Ltd. All rights reserved.
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