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Hypodynamia Alters Bone Quality and Trabecular Microarchitecture
Eric Aguado1,2, Guillaume Mabilleau2, Eric Goyenvalle1,2
1ONIRIS, Ecole Nationale Vétérinaire, route de Gachet, 44307, Nantes Cedex 3, France.
Calcified Tissue International
|February 5, 2017
Summary
Reduced physical activity in chickens significantly decreased bone mass and impaired bone quality. This study highlights confined chickens as a valuable model for understanding hypodynamia-induced bone loss and osteoporosis risk.
Area of Science:
- Bone biology and biomechanics
- Animal models for osteoporosis research
- Effects of physical inactivity on skeletal health
Background:
- Hypodynamia (reduced physical activity) is a risk factor for osteoporosis, leading to bone loss.
- The impact of hypodynamia on bone quality, beyond mass, is not fully understood.
- The hypodynamic chicken model offers potential for studying disuse-induced bone alterations.
Purpose of the Study:
- To investigate the effects of hypodynamia on bone mass, microarchitecture, and quality in chickens.
- To evaluate the suitability of confined chickens as a model for hypodynamic bone disease.
- To analyze changes in bone mineralization and collagen characteristics.
Main Methods:
- Comparison of femurs from freely moving (FREE) and confined (HYPO) chickens using microcomputed tomography (microCT) and nanoindentation.
- Fourier Transform Infrared Microspectroscopy (FTIR) to assess mineralization and collagen.
- Quantitative backscattered electron imaging (qBEI) for mineral matrix analysis.
Main Results:
- Confined chickens (HYPO group) exhibited significantly altered trabecular bone volume and microarchitecture.
- FTIR revealed a reduced mineral-to-matrix ratio, increased carbonate content, and higher crystallinity in the HYPO group, indicating poorer mineral quality.
- Collagen maturity was significantly reduced in the HYPO group, with decreased crosslinking.
- Reduced biomechanical properties were observed at the tissue level in confined chickens.
Conclusions:
- Confined chickens serve as a novel model for studying hypodynamia-induced bone changes without surgical intervention.
- Hypodynamia in chickens leads to decreased bone mass and compromised bone matrix quality, characterized by reduced mineralization and collagen crosslinking.
- This model is valuable for investigating the mechanisms underlying disuse-induced osteoporosis.
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