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Effects of fibronectin on hydroxyapatite formation
D Couchourel1, C Escoffier, R Rohanizadeh
1Laboratoire de Recherche sur les Matériaux d'Intérêt Biologique, UPRES EA 2159, Faculté de Chirurgie Dentaire, Nantes, France.
Journal of Inorganic Biochemistry
|May 20, 1999
Summary
Fibronectin, a protein found during bone mineralization, shows varied effects in vitro. It can inhibit or stimulate calcium phosphate crystal formation depending on its interaction with surfaces, suggesting a complex role in bone development.
Area of Science:
- Biochemistry
- Biomineralization
- Bone Biology
Background:
- Noncollagenous matrix proteins are increasingly recognized for their role in initiating bone mineralization in vivo.
- Fibronectin is present during early mineralization phases and may contribute to this process in bone tissues.
Purpose of the Study:
- To investigate the mineralization potential of fibronectin in vitro.
- To understand how fibronectin influences calcium phosphate crystal formation.
Main Methods:
- An agarose gel precipitation system was used to test fibronectin's effect on mineralization.
- A metastable calcium phosphate solution was employed to assess fibronectin's interaction with crystal formation.
Main Results:
- Fibronectin inhibited calcium phosphate crystal precipitation in solution.
- Fibronectin had no apparent effect in gel precipitation systems.
- Fibronectin stimulated apatite crystal formation when seeded on apatite powder in gel.
Conclusions:
- In vitro results suggest fibronectin's role in mineralization is context-dependent.
- Free fibronectin may inhibit crystal growth, while surface-bound fibronectin could activate mineralization in bone environments and ectopic mineralization sites.