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Related Experiment Videos

Factors regulating mandibular condylar growth.

A B M Rabie1, U Hägg

  • 1Department of Orthodontics, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Hong Kong SAR, China. rabie@hkusua.hku.hk

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|November 2, 2002
PubMed
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This study identifies key molecular factors, including Sox 9 and vascular endothelial growth factor (VEGF), that regulate condylar growth. Their expression patterns correlate with bone formation during endochondral ossification.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Developmental Biology

Background:

  • Factors regulating mandibular condylar growth remain largely unidentified.
  • Understanding these factors is crucial for addressing growth abnormalities.

Purpose of the Study:

  • To identify molecular factors regulating condylar growth.
  • To correlate the expression of Sox 9, vascular endothelial growth factor (VEGF), and type X collagen with bone formation.

Main Methods:

  • Immunostaining was used to detect protein expression of Sox 9 and VEGF.
  • Type X collagen expression was analyzed at both mRNA and protein levels.
  • 115 Sprague-Dawley rats (35 days old) were utilized.

Main Results:

Related Experiment Videos

  • Sox 9 was expressed in proliferative cells and chondrocytes.
  • Type X collagen expression by hypertrophic chondrocytes preceded endochondral ossification.
  • VEGF expression peaked before maximal bone formation, indicating its role in vascularization.

Conclusions:

  • Condylar growth is orchestrated by a sequence of molecular events.
  • Sox 9, type X collagen, and VEGF are key molecules involved in condylar development.
  • These findings provide insights into the molecular mechanisms of endochondral bone formation.