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E47 modulates hepatic glucocorticoid action.

M Charlotte Hemmer1, Michael Wierer2, Kristina Schachtrup3

  • 1Molecular Endocrinology, Helmholtz Diabetes Center (HMGU) and German Center for Diabetes Research (DZD), IDO, Ingolstädter Landstr. 1, 85764, Neuherberg, Munich, Germany.

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|January 20, 2019
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This summary is machine-generated.

Glucocorticoids (GCs) cause side effects by activating metabolic genes. The E47 protein is crucial for this process, as its absence prevents GC-induced hyperglycemia and fatty liver, offering a new therapeutic target.

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Area of Science:

  • Endocrinology and Metabolism
  • Molecular Biology
  • Genetics

Background:

  • Glucocorticoids (GCs) are potent drugs with significant clinical utility.
  • However, their use is limited by severe metabolic side effects like hyperglycemia, hyperlipidemia, and obesity.
  • These adverse effects are linked to Glucocorticoid Receptor (GR) activation of metabolic genes.

Purpose of the Study:

  • To investigate the role of the bHLH factor E47 in modulating Glucocorticoid Receptor (GR) target genes.
  • To determine if E47 is essential for GC-induced metabolic dysregulation in the liver.
  • To explore the molecular mechanisms by which E47 influences GR activity.

Main Methods:

  • Utilized mouse genetics to study the function of E47 in hepatic metabolism.
  • Analyzed the impact of E47 loss on GC-induced hyperglycemia and hepatic steatosis.
  • Performed chromatin co-occupancy studies to examine E47 and GR binding sites.
  • Investigated the recruitment of GR and coregulators to chromatin in the presence and absence of E47.

Main Results:

  • E47 was identified as a key modulator of GR target genes involved in metabolic regulation.
  • Loss of E47 in mice prevented the development of hyperglycemia and hepatic steatosis in response to GCs.
  • E47 and GR were found to co-occupy metabolic gene promoters and enhancers.
  • E47 is required for the efficient recruitment of GR and Mediator complex to chromatin.

Conclusions:

  • E47 plays a critical role in GR-mediated regulation of hepatic glucose and lipid metabolism.
  • Targeting the interaction between E47 and GR could lead to novel therapies for GC-induced side effects.
  • Understanding this molecular interplay offers a potential strategy to develop safer GC-based treatments.