Regulation of cAMP Responsive Element Binding Protein 3-Like 1 (Creb3l1) Expression by Orphan Nuclear Receptor Nr4a1

Michael P Greenwood, Mingkwan Greenwood, Benjamin T Gillard, R Chitra Devi, David Murphy

Research output: Contribution to journalArticle (Academic Journal)

2 Citations (Scopus)
247 Downloads (Pure)

Abstract

Cyclic AMP (cAMP) inducible transcription factor cAMP responsive element binding protein 3 like 1 (Creb3l1) is strongly activated in the hypothalamus in response to hyperosmotic cues such as dehydration (DH). We have recently shown that Creb3l1 expression is upregulated by cAMP pathwaysin vitro, however the exact mechanisms are not known. Here we show that increasing Creb3l1 transcription by raising cAMP levels in mouse pituitary AtT20 cells automatically initiates cleavage of Creb3l1, leading to a greater abundance of the transcriptionally active N-terminal portion. Inhibiting protein synthesis indicated thatde novoprotein synthesis of an intermediary transcription factor was required for Creb3l1 induction. Strategic mining of our microarray data from dehydrated rodent hypothalamus revealed four candidates, reduced to two by analysis of acute hyperosmotic-induced transcriptional activation profiles in the hypothalamus, and one, orphan nuclear receptor Nr4a1, by direct shRNA mediated silencing in AtT20 cells. We show that activation of Creb3l1 transcription by Nr4a1 involves interaction with a single NBRE site in the promoter region. The ability to activate Creb3l1 transcription by this pathwayin vitrois dictated by the level of methylation of a CpG island within the proximal promoter/5'UTR of this gene. We thus identify a novel cAMP-Nr4a1-Creb3l1 transcriptional pathway in AtT20 cells and also, our evidence would suggest, in the hypothalamus.

Original languageEnglish
Article number413
Number of pages16
JournalFrontiers in Molecular Neuroscience
Volume10
DOIs
Publication statusPublished - 12 Dec 2017

Keywords

  • methylation
  • hypothalamus
  • transcriptional activation
  • transcription factor
  • cAMP
  • vasopressin

Fingerprint Dive into the research topics of 'Regulation of cAMP Responsive Element Binding Protein 3-Like 1 (Creb3l1) Expression by Orphan Nuclear Receptor Nr4a1'. Together they form a unique fingerprint.

  • Cite this