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A Chick Embryo in-Vitro Model of Knee Morphogenesis
Edward K Rodriguez1, Jeeva Munasinghe1
1Orthopedic Trauma Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA.
The Archives of Bone and Joint Surgery
|May 21, 2016
Summary
Mechanical loading of chick embryo knee joints in vitro promotes joint differentiation and glycosaminoglycan production. However, this in vitro model shows less growth than intact embryos, highlighting its utility for studying mechanical loading effects.
Area of Science:
- Developmental biology
- Biomechanics
- Tissue engineering
Background:
- Joint morphogenesis is influenced by mechanical forces.
- An in vitro model is needed to study these effects.
Purpose of the Study:
- To develop and validate an in vitro model of chick embryo knee joint morphogenesis.
- To assess the impact of mechanical loading on joint development.
Main Methods:
- Developed an in vitro system for controlled flexion-extension of chick embryonic knee joints.
- Assessed joint morphogenesis using histology and micro MRI.
- Quantified glycosaminoglycan (GAG) concentration using delayed gadolinium-enhanced MRI of cartilage (dGEMRIC).
Main Results:
- Loaded limb cultures showed increased GAG production compared to unloaded cultures.
- Higher T1 values in loaded specimens indicate greater GAG concentration.
- In vitro loaded limbs did not achieve the same level of growth or differentiation as in vivo controls.
Conclusions:
- Isolated chick limb cultures under mechanical load are viable and promote joint differentiation.
- The in vitro model demonstrates the positive effect of mechanical loading on GAG production.
- The model's limitations include reduced absolute growth compared to intact embryos.
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