Fluoride affects bone repair differently in mice models with distinct bone densities

Area of Science:

• Biochemistry
• Genetics
• Histology

Background:

• Bone density can influence biological responses to environmental factors like fluoride.
• Understanding fluoride's effects on bone is crucial for public health.
• Genetic variations may affect individual susceptibility to fluoride toxicity.

Purpose of the Study:

• To investigate the influence of bone density on fluoride's biological effects.
• To compare the effects of fluoride on bone neoformation in different mouse strains.
• To determine if a genetic component influences susceptibility to fluoride's impact on bone metabolism.

Main Methods:

• Two mouse strains (C57BL/6J and C3H/HeJ) were used, with 32 mice per strain.
• Mice received either 0 ppm (control) or 50 ppm fluoride in food and water for up to 28 days.
• Histological and histomorphometric analyses of incisor and maxilla samples were performed at 7, 14, 21, and 28 days.

Main Results:

• Bone neoformation was observed in all groups, characterized by bone islets replacing connective tissue.
• This bone formation was more pronounced in the C57BL/6J strain compared to C3H/HeJ.
• Histomorphometric analysis confirmed increased new bone tissue in C57BL/6J and a decrease in C3H/HeJ mice.

Conclusions:

• Fluoride exhibits differential effects on bone metabolism, influenced by genetic factors.
• The C57BL/6J strain showed a greater response to fluoride-induced bone neoformation.
• Results confirm a genetic basis for susceptibility to fluoride's effects on bone.