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Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
08:34

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis

Published on: June 3, 2016

The orphan nuclear receptor RORalpha restrains adipocyte differentiation through a reduction of C/EBPbeta activity

Nobumichi Ohoka1, Shogo Kato, Yu Takahashi

  • 1Department of Applied Biological Chemistry, The University of Tokyo, Japan.

Molecular Endocrinology (Baltimore, Md.)
|March 28, 2009
PubMed

Insights

Retinoic acid receptor-related orphan receptor alpha (RORalpha) inhibits adipocyte differentiation by blocking key transcription factors. RORalpha negatively regulates adipogenesis through dual mechanisms, impacting C/EBPbeta and PPARgamma activity.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Endocrinology

Background:

  • Retinoic acid receptor-related orphan receptor alpha (RORalpha) is a transcription factor involved in various cellular functions.
  • The precise role of RORalpha in adipocyte differentiation remains incompletely understood.

Purpose of the Study:

  • To elucidate the role and mechanism of RORalpha in regulating adipocyte differentiation.

Main Methods:

  • Investigated the interaction between RORalpha and CCAAT/enhancer-binding protein beta (C/EBPbeta).
  • Assessed the impact of RORalpha on the expression of adipogenic genes like PPARgamma and C/EBPalpha.
  • Analyzed the effect of RORalpha on perilipin gene expression and its promoter activity.
  • Examined the competitive antagonism between RORalpha and peroxisome proliferators-activated receptor gamma (PPARgamma).

Main Results:

  • RORalpha suppresses C/EBPbeta transcriptional activity, inhibiting C/EBPbeta-dependent adipogenesis.
  • RORalpha represses the association of C/EBPbeta with p300 and its recruitment to chromatin.
  • RORalpha antagonizes PPARgamma activity by binding to a suppressive ROR-responsive element in the perilipin promoter, thus inhibiting perilipin induction.
  • RORalpha acts as a negative regulator of adipocyte differentiation through these dual mechanisms.

Conclusions:

  • RORalpha is identified as a novel negative regulator of adipocyte differentiation.
  • RORalpha inhibits adipogenesis by interfering with both C/EBPbeta and PPARgamma signaling pathways.
  • These findings provide new insights into the molecular mechanisms controlling adipocyte development.

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