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Combinatorial Synthesis of and High-throughput Protein Release from Polymer Film and Nanoparticle Libraries
Published on: September 6, 2012
Identification of osteoconductive and biodegradable polymers from a combinatorial polymer library
Darren M Brey1, Cindy Chung, Kurt D Hankenson
1Department of Bioengineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Journal of Biomedical Materials Research. Part A
|March 4, 2010
Summary
Researchers developed biodegradable poly(beta-amino ester)s (PBAEs) for tissue repair. A specific PBAE scaffold, A6, promoted mineralized tissue formation when combined with bone morphogenetic protein-2 (BMP-2), showing potential for bone regeneration.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Tissue Engineering
Background:
- Combinatorial polymer synthesis enables rapid development of materials for biomedical applications.
- Biodegradable and photopolymerizable poly(beta-amino ester)s (PBAEs) offer tunable properties for diverse uses.
- Scaffolding materials are crucial for mineralized tissue repair, requiring specific physical and biological characteristics.
Purpose of the Study:
- To screen a library of poly(beta-amino ester)s (PBAEs) for suitable bone scaffolding materials.
- To evaluate the osteoconductive and osteoinductive potential of the most promising PBAE candidate.
- To assess the in vivo performance of PBAE scaffolds in promoting mineralized tissue formation.
Main Methods:
- A library of photopolymerizable and biodegradable PBAEs was synthesized and characterized.
- Candidate materials were screened for physical properties, cell viability, and osteoconductivity.
- The lead candidate, A6, was fabricated into 3D porous scaffolds.
- Scaffolds were implanted subcutaneously, intramuscularly, and in cranial defects, with and without bone morphogenetic protein-2 (BMP-2).
- Mineralized tissue formation was assessed using radiography, micro-computed tomography, and histology.
Main Results:
- The PBAE library provided materials with tunable degradation and mechanical properties.
- Scaffold A6 demonstrated good biocompatibility with a mild inflammatory response upon subcutaneous implantation.
- In vivo implantation showed significant mineralized tissue formation in the presence of BMP-2, both intramuscularly and in cranial defects.
- Scaffolds without BMP-2 exhibited minimal mineralized tissue formation, highlighting the role of the growth factor.
Conclusions:
- A systematic process was established to identify optimal scaffolding materials from combinatorial polymer libraries.
- Poly(beta-amino ester) (PBAE) scaffold A6 is a promising candidate for mineralized tissue repair.
- The combination of PBAE scaffolds with BMP-2 can induce osteoconductive and osteoinductive effects for enhanced bone regeneration.
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