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Structure, ingredient, and function-based biomimetic scaffolds for accelerated healing of tendon-bone interface
YuHan Dong1, JiangFeng Li2, Qiang Jiang1
1College of Pharmacy, Chongqing Medical University, Chongqing, 400016, China.
Journal of Orthopaedic Translation
|August 26, 2024
Summary
A novel biomimetic scaffold effectively promotes tendon-bone healing by mimicking natural tissue structure and composition. This hierarchical scaffold enhances regeneration and shows potential for clinical applications in tendon-bone repair.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Tendon-bone interface (TBI) repair is challenging due to its complex hierarchical structure, gradient composition, and function.
- Existing repair methods are often slow and ineffective.
- A biomimetic scaffold is needed to address these challenges.
Purpose of the Study:
- To fabricate a novel hierarchical scaffold mimicking the structure, composition, and function of the natural TBI.
- To evaluate the scaffold's ability to promote gradient differentiation of cells.
- To assess the efficacy of the scaffold in promoting tendon-bone healing in an animal model.
Main Methods:
- Fabricated a tri-layered scaffold using poly-lactic-co-glycolic-acid, nano-hydroxyapatite, BMP2-gelatin, sodium alginate, type I collagen, and TGF-β3.
- Oriented L-poly-lactic-acid fibers to simulate tendon structure.
- Characterized scaffold properties including morphology, kinetics, degradation, and mechanical strength.
- Evaluated gradient differentiation of bone marrow mesenchymal stem cells (BMSCs) and tenocytes.
- Implanted BMSCs-seeded scaffolds into a rat Achilles tendon defect model and assessed healing outcomes.
Main Results:
- The hierarchical scaffold exhibited gradual composition and mechanical properties matching TBI characteristics.
- The scaffold demonstrated gradient differentiation inductivity by providing a suitable microenvironment for cells.
- Scaffolds seeded with BMSCs significantly accelerated healing in rat Achilles tendon defects.
- Histological and biomechanical assessments confirmed enhanced tendon-bone healing quality.
Conclusions:
- Hierarchical scaffolds simulating TBI effectively promote regeneration and enhance healing quality.
- The developed scaffold offers a promising microenvironment for tendon-bone healing.
- This biomimetic scaffold holds significant potential for clinical applications in TBI repair.
