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Pref-1 regulates mesenchymal cell commitment and differentiation through Sox9.

Yuhui Wang1, Hei Sook Sul

  • 1Department of Nutritional Science and Toxicology, University of California, Berkeley, Berkeley, CA 94720, USA.

Cell Metabolism
|March 4, 2009
PubMed
Summary
This summary is machine-generated.

Pref-1 protein inhibits fat cell development by increasing Sox9 expression. This mechanism directs mesenchymal stem cells toward cartilage while blocking bone and fat cell differentiation.

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Area of Science:

  • Cell biology
  • Developmental biology
  • Molecular signaling

Background:

  • Pref-1 (also known as DLK1) is a transmembrane protein known to inhibit adipogenesis.
  • The precise molecular targets and functions of Pref-1 in mesenchymal stem cell differentiation remain unclear.

Purpose of the Study:

  • To elucidate the role of Pref-1 in mesenchymal cell lineage commitment and differentiation.
  • To identify the molecular targets through which Pref-1 exerts its effects on adipogenesis, chondrogenesis, and osteogenesis.

Main Methods:

  • Investigated the expression of Sox9 during adipocyte differentiation.
  • Examined the effect of Pref-1 on Sox9 expression and its binding to C/EBP promoter regions.
  • Utilized Pref-1 null and transgenic mouse models to study in vivo differentiation.
  • Assessed Pref-1's impact on chondrogenic and osteogenic differentiation of mesenchymal cells.

Main Results:

  • Sox9 downregulation is essential for adipocyte differentiation.
  • Pref-1 upregulates Sox9 expression, thereby inhibiting adipocyte differentiation.
  • Sox9 directly suppresses the promoter activity of C/EBPbeta and C/EBPdelta.
  • Pref-1 promotes chondrogenesis but inhibits chondrocyte maturation and osteoblast differentiation by inducing Sox9.

Conclusions:

  • Sox9 is a key molecular target of Pref-1 in mesenchymal stem cell differentiation.
  • Pref-1 directs multipotent mesenchymal cells towards the chondrogenic lineage.
  • Pref-1 inhibits differentiation into adipocytes, osteoblasts, and mature chondrocytes via Sox9 induction.