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Title: Novel PCL-based honeycomb scaffolds as drug delivery systems for rhBMP-2
Authors: Rai, B.
Teoh, S.H. 
Hutmacher, D.W. 
Cao, T. 
Ho, K.H. 
Keywords: BMP
Bone tissue engineering
Drug delivery
Issue Date: Jun-2005
Citation: Rai, B., Teoh, S.H., Hutmacher, D.W., Cao, T., Ho, K.H. (2005-06). Novel PCL-based honeycomb scaffolds as drug delivery systems for rhBMP-2. Biomaterials 26 (17) : 3739-3748. ScholarBank@NUS Repository.
Abstract: This study investigated a novel drug delivery system (DDS), consisting of polycaprolactone (PCL) or polycaprolactone 20% tricalcium phosphate (PCL-TCP) biodegradable scaffolds, fibrin Tisseel sealant and recombinant bone morphogenetic protein-2 (rhBMP-2) for bone regeneration. PCL and PCL-TCP-fibrin composites displayed a loading efficiency of 70% and 43%, respectively. Fluorescence and scanning electron microscopy revealed sparse clumps of rhBMP-2 particles, non-uniformly distributed on the rods' surface of PCL-fibrin composites. In contrast, individual rhBMP-2 particles were evident and uniformly distributed on the rods' surface of the PCL-TCP-fibrin composites. PCL-fibrin composites loaded with 10 and 20 μg/ml rhBMP-2 demonstrated a triphasic release profile as quantified by an enzyme-linked immunosorbent assay (ELISA). This consisted of burst releases at 2 h, and days 7 and 16. A biphasic release profile was observed for PCL-TCP-fibrin composites loaded with 10 μg/ml rhBMP-2, consisting of burst releases at 2 h and day 14. PCL-TCP-fibrin composites loaded with 20 μg/ml rhBMP-2 showed a tri-phasic release profile, consisting of burst releases at 2 h, and days 10 and 21. We conclude that the addition of TCP caused a delay in rhBMP-2 release. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and alkaline phosphatase assay verified the stability and bioactivity of eluted rhBMP-2 at all time points. © 2004 Elsevier Ltd. All rights reserved.
Source Title: Biomaterials
ISSN: 01429612
DOI: 10.1016/j.biomaterials.2004.09.052
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