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A Simple Critical-sized Femoral Defect Model in Mice
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A mouse model for human osteogenesis imperfecta type VI.

Rosalind Bogan1, Ryan C Riddle, Zhu Li

  • 1Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|February 16, 2013
PubMed
Summary

Osteogenesis imperfecta type VI is linked to SERPINF1 gene mutations. A mouse model lacking pigment epithelium-derived factor (PEDF) shows bone abnormalities mirroring human OI type VI.

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Area of Science:

  • Genetics and Molecular Biology
  • Skeletal Biology
  • Biochemistry

Background:

  • Osteogenesis imperfecta type VI (OI type VI) is associated with mutations in the SERPINF1 gene.
  • The SERPINF1 gene encodes pigment epithelium-derived factor (PEDF), a protein with known neurotrophic and antiangiogenic functions.
  • The role of PEDF in skeletal development and bone disorders like OI type VI requires further elucidation.

Purpose of the Study:

  • To characterize the skeletal phenotype of a mouse model with targeted disruption of the Pedf gene.
  • To investigate the function of PEDF in bone biology.
  • To establish a relevant animal model for studying OI type VI.

Main Methods:

  • Generation and analysis of Pedf null mutant mice.
  • Micro-computed tomography (µCT) for bone structural analysis.
  • Quantitative bone histomorphometry and Fourier transform infrared microscopy (FTIR) for bone matrix and mineralization assessment.
  • In vitro studies of osteoblast function from mutant mice.

Main Results:

  • Pedf null mutant mice exhibited reduced trabecular bone volume and accumulation of unmineralized bone matrix in femurs.
  • Mutant bones showed an increased mineral:matrix ratio and increased brittleness compared to controls.
  • In vitro, osteoblasts from Pedf null mice displayed enhanced mineral deposition and an increased mineral:matrix ratio.

Conclusions:

  • Targeted disruption of Pedf in mice results in skeletal abnormalities mirroring human OI type VI.
  • PEDF plays a crucial role in regulating bone mineralization and matrix composition.
  • The Pedf null mouse serves as a valuable model for investigating the pathogenesis and potential treatments for OI type VI.