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Fluoride effects on bone formation and mineralization are influenced by genetics
1Orthopaedic Research Laboratory, Cliniques Universitaires Saint-Luc, Catholic University of Louvain, Brussels, Belgium.
Bone
|August 30, 2008
Summary
Genetic factors influence bone response to fluoride exposure. While fluoride increased osteoid formation and crystal width, it did not significantly alter bone microarchitecture or microhardness across mouse strains.
Area of Science:
- Bone biology
- Skeletal physiology
- Fluoride toxicology
Background:
- Genetic variations influence individual responses to fluoride exposure.
- Different mouse strains exhibit varying susceptibility to dental fluorosis.
- Previous studies noted altered bone mechanical properties with increasing fluoride doses.
Purpose of the Study:
- To evaluate the structural and material properties of bone in response to varying fluoride doses.
- To elucidate the mechanisms behind observed changes in bone mechanical properties.
- To investigate the effects of fluoride on bone formation, microarchitecture, mineralization, and microhardness in genetically distinct mouse strains.
Main Methods:
- Assessed bone formation via static histomorphometry.
- Quantified bone microarchitecture using microcomputed tomography and strut analysis.
- Evaluated bone mineralization using backscattered electron imaging and powder X-ray diffraction.
- Measured microhardness of vertebral and femur bone.
Main Results:
- Fluoride exposure did not significantly alter bone microarchitecture in any mouse strain.
- Increased osteoid formation was observed at the highest fluoride dose across all strains.
- Fluoride led to decreased mineralization heterogeneity in trabecular bone of the SWR/J strain.
- Increased crystal width correlated with higher fluoride doses, while microhardness remained unaffected.
Conclusions:
- Fluoride exposure does not significantly impact bone microarchitecture.
- Increased osteoid and altered crystal width suggest fluoride delays new bone mineralization.
- Genetic differences, like smaller crystallites in resistant strains, may indicate stronger organic/inorganic interfaces influencing bone strength.
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