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Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
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Multiple channels with interconnected pores in a bioceramic scaffold promote bone tissue formation
Xuesong Wang1, Ziyan Nie1, Jia Chang2
1Department of Ocean and Mechanical Engineering, College of Engineering and Computer Science, Florida Atlantic University, Boca Raton, FL, 33431, USA.
Scientific Reports
|October 15, 2021
Summary
Creating interconnected multiple channels in beta-tricalcium phosphate (β-TCP) scaffolds significantly enhances bone regeneration. This cell- and growth factor-free approach improves vascularization and bone matrix deposition for critical-size bone defects.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Orthopedic Surgery
Background:
- Porous scaffolds often face challenges with nutrient/blood supply, limiting bone formation.
- Existing methods using cells or growth factors can be complex and costly.
Purpose of the Study:
- To investigate the efficacy of an interconnected multiple-channeled beta-tricalcium phosphate (β-TCP) scaffold for bone regeneration.
- To evaluate a cell- and growth factor-free approach for inducing bone formation in critical-size defects.
Main Methods:
- Developed β-TCP scaffolds with interconnected multiple channels.
- Conducted in vitro studies with human bone marrow mesenchymal stem cells to assess cell behavior and gene expression.
- Performed in vivo implantation in critical-size bone defects to evaluate bone formation and vascularization.
Main Results:
- Multiple channels promoted human bone marrow mesenchymal stem cell attachment, proliferation, alkaline phosphatase activity, and osteogenic gene expression.
- Enhanced expression of mechanosensing markers (focal adhesion kinase, filamentous actin, Yes-associated protein-1) was observed.
- In vivo, multiple-channeled scaffolds showed increased bone formation, collagen type I, bone sialoprotein, osteocalcin expression, mineral deposition, and vasculature structures compared to non-channeled scaffolds.
Conclusions:
- Interconnected multiple channels in β-TCP scaffolds are a promising strategy for enhancing bone tissue regeneration.
- This approach effectively overcomes limitations of nutrient transport and blood supply in bone defect healing.
- The cell- and growth factor-free method offers a simplified yet effective solution for critical-size bone defects.
