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Published on: July 14, 2023
Structural bone allograft combined with genetically engineered mesenchymal stem cells as a novel platform for bone
Chao Xie1, David Reynolds, Hani Awad
1Center for Musculoskeletal Research, University of Rochester, School of Medicine and Dentistry, Rochester, New York 14642, USA.
Tissue Engineering
|May 24, 2007
Summary
Engineered mesenchymal stem cells created a functional pseudo-periosteum on bone allografts, significantly improving bone healing and biomechanical strength. This novel approach enhances bone regeneration and reduces graft resorption for better tissue engineering outcomes.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Orthopedic Surgery
Background:
- Live periosteal cells promote superior bone graft healing compared to devitalized grafts.
- Periosteum is crucial for bone formation, healing, and vascularization in structural bone grafts.
- Developing methods to induce similar healing responses on allografts is essential for bone tissue engineering.
Purpose of the Study:
- To engineer a "live pseudo-periosteum" using genetically modified mesenchymal stem cells (C9) to enhance devitalized bone allograft healing.
- To evaluate the efficacy of C9-coated allografts in a murine femoral defect model.
- To assess the histological, biomechanical, and micro-architectural outcomes of the engineered bone grafts.
Main Methods:
- Seeding a mesenchymal stem cell line (C9) engineered with bone morphogenic protein-2 onto devitalized bone allografts.
- Utilizing a small intestinal submucosa scaffold wrapped around allografts for cell delivery.
- Employing histology, biomechanical testing, and micro-computed tomography for analysis at various time points.
Main Results:
- C9-coated allografts showed early cartilaginous tissue formation and formed a new cortical shell bridging defects by 6-9 weeks.
- Biomechanical testing revealed torsional strength and stiffness equivalent to intact femurs at 6 weeks and superior to live isografts at 9 weeks.
- Micro-CT analysis demonstrated a 2-fold increase in new bone formation and increased polar moment of inertia (pMOI), with slower graft resorption compared to live isografts.
Conclusions:
- Genetically engineered mesenchymal stem cells can create a functional pseudo-periosteum on bone allografts, promoting robust bone regeneration.
- This strategy significantly enhances the biomechanical properties of bone allografts, offering a promising platform for bone tissue engineering.
- The combination of engineered cells and structural allografts represents a novel approach to overcome limitations of current bone grafting techniques.
