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Bone fibrillogenesis and mineralization: quantitative analysis and implications for tissue elasticity
Jenny Vuong1, Christian Hellmich
1Institute for Mechanics of Materials and Structures, Vienna University of Technology (TU Wien), A-1040 Wien (Vienna), Austria. jenny.vuong@tuwien.ac.at
Journal of Theoretical Biology
|August 13, 2011
Summary
Bone composition follows a unique bilinear relationship between organic and mineral content, impacting mass density and elasticity across species and ages. This finding offers insights into bone growth, transformation, and tissue engineering strategies.
Area of Science:
- Biomaterials Science
- Bone Biology
- Biophysics
Background:
- Bone exhibits diverse chemical compositions across species, organs, and ages.
- Understanding extracellular bone matrix composition is crucial for comprehending bone's mechanical properties.
Purpose of the Study:
- To analyze long-term bone composition data to identify underlying relationships.
- To establish universal laws governing bone mass density, elasticity, and composition.
- To inform tissue engineering strategies by understanding bone's natural formation and transformation processes.
Main Methods:
- Analysis of extensive bone composition data (over 80 years) from drying, demineralization, and deorganification tests.
- Extraction of chemical concentrations for hydroxyapatite, water, and organic material (collagen).
- Application of micromechanical models to derive mass density-elasticity relationships.
Main Results:
- A unique bilinear relationship exists between organic and mineral concentrations in bone across different species, organs, and age groups.
- During growth, mineral concentration increases linearly with organic concentration (fibrillogenesis).
- In adulthood, increased mineral concentration correlates with decreased organic concentration.
- Universal mass density-concentration and mass density-elasticity relationships were identified for the extracellular bone matrix.
Conclusions:
- The identified bilinear relationship and derived laws reflect the intricate interplay of bone cells (osteoblasts, osteoclasts, osteocytes) in matrix formation and remodeling.
- These findings provide a quantitative understanding of bone's chemical genesis and transformation.
- The established rules have significant implications for improving tissue engineering strategies, particularly in translating bone's growth and mineralization characteristics to achieve tissue-specific elastic properties.
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