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Fluorosis: a new model and new insights
J D Bartlett1, S E Dwyer, E Beniash
1Department of Biomineralization, The Forsyth Institute, Boston, MA 02115, USA.
Journal of Dental Research
|August 20, 2005
Summary
Zebrafish teeth exposed to excess fluoride show surface damage and increased organic content. This study suggests reduced Alk8 signaling and increased cell death may cause dental fluorosis.
Area of Science:
- Biomineralization
- Developmental Biology
- Toxicology
Background:
- Fluoride prevents dental caries but excessive exposure causes fluorosis.
- The precise mechanism of fluoride-induced dental fluorosis is not fully understood.
- Zebrafish offer a unique model for studying continuous tooth development and fluoride effects.
Purpose of the Study:
- To investigate the utility of zebrafish as a model organism for dental fluorosis research.
- To elucidate the effects of excessive fluoride exposure on zebrafish tooth structure and molecular pathways.
Main Methods:
- Scanning electron microscopy (SEM) to analyze tooth surface morphology.
- Fourier-transform infrared spectroscopy (FTIR) to assess tooth composition.
- Analysis of signaling molecule expression (Alk8) and cell apoptosis.
Main Results:
- Fluoride-treated zebrafish teeth exhibited pitted and rough enameloid surfaces.
- FTIR analysis revealed significantly higher organic content in fluoride-exposed teeth.
- Decreased Alk8 expression and increased cell apoptosis were observed in fluoride-treated teeth.
Conclusions:
- Zebrafish serve as a viable model for studying dental fluorosis.
- Excessive fluoride exposure alters zebrafish tooth enameloid structure and composition.
- Reduced Alk8 signaling and increased apoptosis are potential contributors to the fluorotic phenotype in zebrafish.