Micro-computed tomography assessment of bone structure in aging mice

Area of Science:

• Biomedical Engineering
• Comparative Anatomy
• Gerontology

Background:

• High-resolution computed tomography (CT) is crucial for evaluating bone structure.
• Standardized micro-CT (μCT) protocols exist for mouse long bones and vertebrae but not craniofacial bones.
• Understanding age-related bone changes is vital for both physiological and pathological studies.

Purpose of the Study:

• To conduct a morphometric assessment of craniofacial bones in aging mice.
• To compare age-related microarchitectural changes in craniofacial bones with those in long bones.
• To establish whether age and sex influence craniofacial bone microarchitecture.

Main Methods:

• Utilized high-resolution computed tomography (CT) for detailed bone analysis.
• Performed morphometric assessments on craniofacial and long bones from aging mice.
• Analyzed age- and sex-related differences in bone microarchitecture.

Main Results:

• Age-related microarchitectural changes were observed in femur, tibia, vertebra, and basisphenoid bone, more so in females.
• Interparietal bone and mandibular body showed minimal age- and sex-related alterations.
• Mandibular condyle aging effects were more pronounced in males than females.

Conclusions:

• Mouse craniofacial bones exhibit unique responses to aging and sex compared to long bones.
• Intramembranous ossified bones (interparietal, mandibular body) are more resistant to age-related changes.
• Specific craniofacial regions demonstrate distinct sex-dimorphic aging patterns.