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Biomimetic composite coating on rapid prototyped scaffolds for bone tissue engineering.
M Tarik Arafat1, Christopher X F Lam, Andrew K Ekaputra
1Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore.
Acta Biomaterialia
|September 21, 2010
Summary
This study enhanced poly(ε-caprolactone)/tri-calcium phosphate (PCL/TCP) scaffolds with a biomimetic carbonated hydroxyapatite-gelatin coating. The composite coating significantly improved cell proliferation and osteogenic differentiation for bone tissue engineering applications.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Biomedical Engineering
Background:
- Rapid prototyping enables fabrication of complex scaffolds for bone regeneration.
- Poly(ε-caprolactone)/tri-calcium phosphate (PCL/TCP) scaffolds offer a promising base material.
- Enhancing scaffold surface properties is crucial for improved cell interaction and bone formation.
Purpose of the Study:
- To improve the functional performance of rapid prototyped PCL/TCP scaffolds for bone tissue engineering.
- To develop a biomimetic composite coating using carbonated hydroxyapatite (CHA) and gelatin.
- To evaluate the effect of the CHA-gelatin coating on scaffold structure, mechanical properties, and cellular response.
Main Methods:
- Fabrication of PCL/TCP scaffolds using screw extrusion system (SES).
- Biomimetic co-precipitation of CHA-gelatin composite coating.
- Characterization using SEM, XPS, FTIR, and mechanical testing.
- In vitro evaluation with porcine bone marrow stromal cells (BMSCs) assessing proliferation and osteogenic differentiation via RT-PCR and Western blot.
Main Results:
- The CHA-gelatin coating did not negatively impact scaffold mechanical properties.
- SEM and confocal microscopy revealed uniform cell distribution and extracellular matrix accumulation.
- BMSC proliferation was significantly higher on CHA-gelatin coated scaffolds compared to uncoated or CHA-only coated scaffolds.
- CHA-gelatin composite coating maximally stimulated BMSC osteogenic differentiation.
Conclusions:
- Biomimetic CHA-gelatin composite coating effectively enhances PCL/TCP scaffolds for bone tissue engineering.
- The enhanced scaffolds promote superior cell proliferation and osteogenic differentiation.
- These findings highlight the potential of CHA-gelatin coated PCL/TCP scaffolds in regenerative medicine.
