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Effects of Wnt signaling on brown adipocyte differentiation and metabolism mediated by PGC-1alpha

Sona Kang1, Laszlo Bajnok, Kenneth A Longo

  • 1Department of Molecular and Integrative Physiology, University of Michigan Medical School, 1301 E. Catherine Rd., Ann Arbor, MI 48109-0622, USA.

Molecular and Cellular Biology
|February 3, 2005
PubMed

Insights

Canonical Wnt signaling activation inhibits brown adipogenesis and promotes white adipocyte conversion. This pathway regulates brown adipose tissue development and metabolism, impacting UCP1 and PGC-1alpha expression.

Area of Science:

  • Cell Biology
  • Metabolic Regulation
  • Adipocyte Differentiation

Background:

  • Canonical Wnt signaling plays a role in cell differentiation.
  • Brown adipogenesis is crucial for thermogenesis and energy expenditure.
  • Transcription factors like PPARgamma, C/EBPalpha, and PGC-1alpha are key regulators of adipogenesis.

Purpose of the Study:

  • To investigate the role of Wnt signaling in brown adipogenesis and adipocyte function.
  • To elucidate the molecular mechanisms by which Wnt signaling affects brown adipose tissue (BAT) development.
  • To determine if Wnt signaling influences the conversion of brown to white adipocytes.

Main Methods:

  • In vitro cell culture experiments with enforced gene expression.
  • Analysis of adipogenic markers (PPARgamma, C/EBPalpha, FABP4, UCP1) and PGC-1alpha.
  • Generation and analysis of UCP1-Wnt10b transgenic mouse models.
  • Assessment of interscapular brown adipose tissue in response to cold challenge and genetic obesity.

Main Results:

  • Wnt signaling activation impedes brown adipogenesis by inhibiting PPARgamma and C/EBPalpha induction.
  • Enforced PGC-1alpha expression is necessary for UCP1 activation in Wnt-expressing cells.
  • Wnt10b expression in vivo blocks BAT development and UCP1 expression, leading to brown-to-white adipocyte conversion.
  • Wnt signaling suppresses UCP1 via PGC-1alpha repression in mature brown adipocytes.
  • Reciprocal expression of Wnt10b with UCP1 and PGC-1alpha observed in cold-challenged or obese mice.

Conclusions:

  • Canonical Wnt signaling activation early in differentiation blocks brown adipogenesis.
  • Activation of Wnt signaling in mature brown adipocytes promotes their conversion to white adipocytes.
  • Wnt signaling is a critical regulator of brown adipocyte metabolism and tissue identity.

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