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Updated: May 24, 2026

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

Mdm2 controls CREB-dependent transactivation and initiation of adipocyte differentiation

P Hallenborg1, S Feddersen, S Francoz

  • 1Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark.

Cell Death and Differentiation
|March 6, 2012
PubMed

Insights

Murine double minute 2 (Mdm2) plays a novel role in initiating fat cell differentiation, independent of its known function with p53. Mdm2 facilitates gene expression crucial for adipogenesis, suggesting a role in cell fate determination.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The E3 ubiquitin ligase murine double minute 2 (Mdm2) is primarily known for regulating the stability of the p53 tumor suppressor.
  • The p53-independent functions of Mdm2, particularly in cellular differentiation, remain largely unexplored.

Purpose of the Study:

  • To investigate the novel role of Mdm2 in cellular differentiation, specifically adipogenesis.
  • To elucidate the molecular mechanisms underlying Mdm2's function in the initiation of adipocyte differentiation, independent of p53.

Main Methods:

  • Investigated Mdm2's role in cAMP-mediated adipocyte differentiation.
  • Analyzed the recruitment of CREB coactivator Crtc2/TORC2 to the C/EBPδ promoter.
  • Utilized the C2C12 myoblast cell line to assess Mdm2's effect on adipogenesis.

Main Results:

  • Mdm2 is essential for the cAMP-induced expression of CCAAT/enhancer-binding protein δ (C/EBPδ).
  • Mdm2 facilitates the recruitment of the CREB coactivator, CREB-regulated transcription coactivator (Crtc2)/TORC2, to the c/ebpδ promoter.
  • Mdm2 promotes adipogenesis in C2C12 cells, indicating a p53-independent function.

Conclusions:

  • Mdm2 plays a critical, p53-independent role in initiating adipocyte differentiation.
  • Mdm2 regulates CREB-dependent transactivation during adipogenesis by influencing coactivator recruitment.
  • Mdm2 may function as a key regulator in cell fate determination, specifically in adipogenesis.

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