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Osteopenia, decreased bone formation and impaired osteoblast development in Sox4 heterozygous mice

Lise Sofie Haug Nissen-Meyer1, Rune Jemtland, Vigdis T Gautvik

  • 1Department of Biochemistry, Institute of Basic Medical Sciences, University of Oslo, N-0317 Oslo, Norway.

Journal of Cell Science
|July 27, 2007
PubMed

Insights

The transcription factor Sox4 is crucial for bone formation. Sox4 deficiency in mice leads to reduced bone mass and impaired osteoblast function, highlighting its role in skeletal development.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Skeletal Biology

Background:

  • The transcription factor Sox4 is essential for embryonic development.
  • Sox4 is present in the embryonic growth plate, but its role in bone metabolism is unclear.

Purpose of the Study:

  • To investigate the function of the transcription factor Sox4 in bone modeling and remodeling.

Main Methods:

  • Analysis of Sox4(+/-) mice using dual-energy X-ray absorptiometry and microcomputed tomography.
  • Histomorphometry, biomechanical testing, and primary osteoblast cultures.
  • Gene expression analysis and siRNA-mediated Sox4 silencing.

Main Results:

  • Sox4(+/-) mice showed significantly lower bone mass, reduced bone thickness, and impaired biomechanical properties compared to wild-type (WT) mice.
  • Bone formation rate was markedly reduced in Sox4(+/-) mice.
  • Osteoblasts from Sox4(+/-) mice exhibited inhibited proliferation, differentiation, and mineralization, with reduced osterix (Osx) and osteocalcin (OCN) mRNA expression.

Conclusions:

  • Sox4 plays a critical role in regulating bone formation, acting upstream of Osx.
  • Sox4 deficiency impairs osteoblast function and bone microarchitecture without affecting osteoclasts.

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