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Mechanical modulation of cartilage structure and function during embryogenesis in the chick
Borjana Mikic1, Arin Lynn Isenstein, Abhinav Chhabra
1Picker Engineering Program, Smith College, Northampton, MA 01063, USA. bmikic@email.smith.edu
Annals of Biomedical Engineering
|February 18, 2004
Summary
Mechanical loading significantly impacts embryonic cartilage development and composition. Immobilization during embryogenesis compromises cartilage matrix properties, affecting its mechanical behavior.
Area of Science:
- Biomechanical Engineering
- Developmental Biology
- Tissue Engineering
Background:
- Cartilage mechanical behavior is linked to biochemical composition.
- Tissue composition is influenced by mechanical loading.
- Embryonic cartilage structure-function relationships are understudied.
Purpose of the Study:
- Investigate the role of mechanical loading in embryonic cartilage development.
- Elucidate how mechanical loading influences cartilage composition during embryogenesis.
Main Methods:
- Utilized an embryonic chick model.
- Compared tibiofemoral joint cartilage from immobilized vs. control embryos.
- Performed stress-relaxation tests on day 14 cartilage samples.
Main Results:
- Embryonic immobilization altered glycosaminoglycan/DNA and hydroxyproline/DNA levels.
- Most pronounced effects were observed between days 9 and 14.
- Immobilized cartilage exhibited compromised material properties, including a 50% reduction in instantaneous elastic modulus (E(inst)).
Conclusions:
- Mechanical loading is crucial for establishing functional biomechanical properties in developing cartilage.
- Embryonic immobilization negatively impacts cartilage matrix composition and mechanical function.
- Mechanical loading should be considered in in vitro culture for cartilage tissue engineering and repair strategies.