AKT1 has dual actions on the glucocorticoid receptor by cooperating with 14-3-3

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Abstract

Glucocorticoids are important therapeutic compounds for acute lymphoblastic leukemia (ALL). AKT1 or the protein kinase B is frequently activated in ALL, and contributes to the development of glucocorticoid resistance. We examined impact of AKT1 on glucocorticoid receptor (GR)-induced transcriptional activity in cooperation with phospho-serine/threonine-binding protein 14-3-3. AKT1 has two distinct actions on GR transcriptional activity, one through segregation of GR in the cytoplasm by phosphorylating GR at Ser-134 and subsequent association of 14-3-3, and the other through direct modulation of GR transcriptional activity in the nucleus. For the latter, AKT1 and 14-3-3 are attracted to DNA-bound GR, accompanied by AKT1-dependent p300 phosphorylation, H3S10 phosphorylation and H3K14 acetylation at the DNA site. These two actions of AKT1 regulate distinct sets of glucocorticoid-responsive genes. Our results suggest that specific inhibition of the AKT1/14-3-3 activity on the cytoplasmic retention of GR may be a promising target for treating glucocorticoid resistance observed in ALL.

Original languageEnglish
Pages (from-to)431-443
Number of pages13
JournalMolecular and Cellular Endocrinology
Volume439
DOIs
Publication statusPublished - 5 Jan 2017

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Keywords

  • Histone modification
  • Nuclear translocation
  • Phosphorylation
  • Protein-protein interaction
  • Transcriptomics

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Endocrinology

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