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Bioabsorbable polymer scaffolds for tissue engineering capable of sustained growth factor delivery
M H Sheridan1, L D Shea, M C Peters
1Department of Biological & Materials Sciences, University of Michigan, Ann Arbor, MI 48109-1078, USA.
Summary
A novel gas foaming technique creates biodegradable polymer scaffolds for tissue engineering. This method enables controlled release of angiogenic factors, promoting new blood vessel growth in engineered tissues.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Regenerative Medicine
Background:
- Biodegradable polymer matrices are crucial for tissue engineering, requiring structural integrity and vascularization support.
- Controlled delivery of angiogenic factors from these matrices can enhance engineered tissue vascularization.
Purpose of the Study:
- To develop a solvent-free, mild fabrication method for creating porous, biodegradable polymer matrices.
- To incorporate and control the release of angiogenic factors for improved tissue vascularization.
Main Methods:
- A gas foaming technique using CO2 was employed to fabricate 3D porous matrices from poly(lactide-co-glycolide) (PLG) copolymers.
- Processing parameters like gas type, polymer composition, and molecular weight were optimized.
- Angiogenic factors were incorporated during fabrication, and their release and bioactivity were assessed.
Main Results:
- CO2 gas foaming successfully produced highly porous (up to 95%) and structurally intact PLG matrices without organic solvents or high temperatures.
- Matrix porosity and mechanical properties were tunable by adjusting PLG composition and molecular weight.
- Incorporated angiogenic factors demonstrated controlled release and retained over 90% bioactivity.
Conclusions:
- A promising system for fabricating 3D biodegradable polymer matrices for controlled angiogenic factor delivery was developed.
- The gas foaming method offers a mild and effective approach for creating scaffolds that support tissue vascularization.