Structural changes in the ageing periosteum using collagen III immuno-staining and chromium labelling as indicators

Area of Science:

• Musculoskeletal biology
• Connective tissue research
• Aging research

Background:

• The periosteum and Sharpey's fibres are crucial at the musculoskeletal interface.
• Age-related changes in these structures may impact tissue function and health.
• The porcine mandible offers a robust model for studying periosteal insertions due to its strength.

Purpose of the Study:

• To compare the periosteal system in young (1-year-old) and older (3-year-old) porcine mandibles.
• To investigate age-related structural and compositional changes in Sharpey's fibres and periosteum.
• To understand the implications of these changes for musculoskeletal health.

Main Methods:

• Undecalcified histology, collagen immunohistochemistry, and mineral histochemistry were employed.
• Polarization, epifluorescence, and laser confocal microscopy were used for examination.
• Chromium labelling with EDX microanalysis facilitated mineral ultrastructure analysis.

Main Results:

• Cortical thickness increased with age, while periosteum thinned and the periosteum:bone ratio decreased.
• Sharpey's fibres became fewer, fragmented, superficial, and shortened with age.
• Calcified particles encroached on periosteal aggregates and Sharpey's fibre bundles in older animals.

Conclusions:

• The periosteum and Sharpey's fibres exhibit significant age-related changes, including hardening and regression.
• These changes involve alterations in fibre architecture, mineralization, and overall structure.
• The findings suggest implications for the functional properties of the musculoskeletal interface in aging individuals.