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Adipose MDM2 regulates systemic insulin sensitivity.

Philip Hallenborg1, Benjamin Anderschou Holbech Jensen2, Even Fjære3

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Mice lacking MDM2, a regulator of tumor suppressor p53, in fat tissue developed obesity and glucose intolerance. This was linked to altered fatty acid metabolism and impaired adipocyte function, highlighting a new MDM2 role in metabolic balance.

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Area of Science:

  • Metabolic research
  • Molecular biology
  • Endocrinology

Background:

  • Obesity and type II diabetes are closely linked, necessitating a better understanding of adipocyte (fat cell) function.
  • The tumor suppressor p53 and its regulator MDM2 play roles in adipocyte biology.

Purpose of the Study:

  • To investigate the role of MDM2 in adipose tissue and its impact on metabolic health.
  • To explore the molecular mechanisms by which MDM2 influences adipocyte function.

Main Methods:

  • Generated mice haploinsufficient for MDM2 in adipose tissue.
  • Assessed metabolic parameters including obesity, glucose tolerance, and hepatic steatosis.
  • Measured circulating fatty acids and gene expression (Scd1, Ffar4) in adipose tissue.
  • Utilized in vitro differentiated adipocytes with perturbed MDM2 expression.
  • Investigated the localization of transcriptional cofactors MORC2 and LIPIN1.

Main Results:

  • Mice haploinsufficient for MDM2 in adipose tissue exhibited obesity, glucose intolerance, and hepatic steatosis.
  • These mice showed reduced circulating palmitoleic acid and impaired expression of Scd1 and Ffar4 in visceral adipose tissue.
  • Perturbed MDM2 expression in vitro adipocytes also led to decreased Scd and Ffar4 expression.
  • Lowered MDM2 levels caused nuclear exclusion of MORC2 and LIPIN1, potentially impairing LIPIN1-mediated PPARγ coactivation.

Conclusions:

  • MDM2 plays a critical role in maintaining adipocyte function and metabolic homeostasis.
  • A novel interplay between MDM2, MORC2, and LIPIN1 is identified in regulating adipocyte function.
  • These findings offer new insights into the molecular mechanisms underlying obesity and type II diabetes.