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PRDM16: the interconvertible adipo-myocyte switch.

Gema Frühbeck1, Pilar Sesma, María A Burrell

  • 1Department of Endocrinology and Metabolic Research Laboratory, Clínica Universitaria, University of Navarra, Pamplona, Spain. gfruhbeck@unav.es

Trends in Cell Biology
|March 17, 2009
PubMed
Summary

Positive regulatory domain containing 16 (PRDM16) dictates brown adipocyte development from skeletal myoblast precursors. Loss of PRDM16 does not yield white adipocytes, revealing its role in a bidirectional cell fate switch.

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Area of Science:

  • Cell biology
  • Developmental biology
  • Metabolism

Background:

  • Brown and white adipocytes, though functionally distinct, were thought to originate from identical precursor cells.
  • The specific molecular mechanisms governing the divergent differentiation pathways of these cell types remain incompletely understood.

Purpose of the Study:

  • To investigate the role of the transcriptional regulator positive regulatory domain containing 16 (PRDM16) in adipocyte differentiation.
  • To elucidate the cell fate determination between brown adipocytes and skeletal myoblasts.

Main Methods:

  • Utilizing genetic manipulation to control PRDM16 expression in progenitor cells.
  • Analyzing the differentiation potential of precursor cells with altered PRDM16 levels.

Main Results:

  • Overexpression of PRDM16 in myoblast-like progenitors promotes brown adipocyte development.
  • Absence of PRDM16 in these precursors does not result in white adipocyte differentiation, indicating a specific role beyond general adipogenesis.
  • PRDM16 acts as a key determinant for switching cell fate between skeletal myoblasts and brown adipocytes.

Conclusions:

  • PRDM16 is a critical regulator controlling a bidirectional cell fate decision.
  • This switch governs the differentiation of specific progenitor cells towards either skeletal muscle or brown adipose tissue lineages.