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Control of Bone Growth by Fibroblast Growth Factors
1Division of Pediatric Endocrinology, University of Maryland School of Medicine, Baltimore, MD 21202, USA.
Trends in Endocrinology and Metabolism: TEM
|May 14, 1999
Summary
Fibroblast growth factors (FGFs) regulate bone growth. FGF-2 impacts growth plate chondrocytes and ossification, with effects varying by dose and administration method.
Area of Science:
- Skeletal biology and growth plate development.
Background:
- Fibroblast growth factors (FGFs) and their receptors (FGFRs) are known negative regulators of longitudinal bone growth.
- Mutations in FGFR3 are linked to skeletal dysplasias (impairing growth) or overgrowth conditions.
Purpose of the Study:
- To investigate the dual role of FGF-2 in regulating bone growth, considering dose-dependent and localized effects.
- To elucidate the mechanisms by which FGF-2 influences chondrogenesis and ossification within the growth plate.
Main Methods:
- Systemic administration of FGF-2 to mice at varying doses.
- Organ culture of growth plates with FGF-2 treatment.
- Assessment of chondrocyte proliferation, hypertrophy, and cartilage matrix synthesis.
- Evaluation of growth plate ossification rates.
Main Results:
- Low systemic doses of FGF-2 stimulated bone growth in mice.
- High systemic doses of FGF-2 inhibited bone growth.
- In vitro, FGF-2 decreased chondrocyte proliferation, hypertrophy, and matrix synthesis.
- Local FGF-2 infusion accelerated growth plate ossification.
Conclusions:
- FGF-2 exhibits a dose-dependent effect on longitudinal bone growth.
- FGF-2 plays a complex role in regulating both chondrogenesis and ossification processes within the growth plate.
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