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An alginate-based hybrid system for growth factor delivery in the functional repair of large bone defects

Kolambkar, Yash M. , Dupont, Kenneth M. , Boerckel, Joel D. , Huebsch, Nathaniel , Mooney, David J. , Hutmacher, Dietmar W., & Guldberg, Robert E. (2011) An alginate-based hybrid system for growth factor delivery in the functional repair of large bone defects. Biomaterials, 32(1), pp. 65-74.

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Abstract

The treatment of challenging fractures and large osseous defects presents a formidable problem for orthopaedic surgeons. Tissue engineering/regenerative medicine approaches seek to solve this problem by delivering osteogenic signals within scaffolding biomaterials. In this study, we introduce a hybrid growth factor delivery system that consists of an electrospun nanofiber mesh tube for guiding bone regeneration combined with peptide-modified alginate hydrogel injected inside the tube for sustained growth factor release. We tested the ability of this system to deliver recombinant bone morphogenetic protein-2 (rhBMP-2) for the repair of critically-sized segmental bone defects in a rat model. Longitudinal [mu]-CT analysis and torsional testing provided quantitative assessment of bone regeneration. Our results indicate that the hybrid delivery system resulted in consistent bony bridging of the challenging bone defects. However, in the absence of rhBMP-2, the use of nanofiber mesh tube and alginate did not result in substantial bone formation. Perforations in the nanofiber mesh accelerated the rhBMP-2 mediated bone repair, and resulted in functional restoration of the regenerated bone. [mu]-CT based angiography indicated that perforations did not significantly affect the revascularization of defects, suggesting that some other interaction with the tissue surrounding the defect such as improved infiltration of osteoprogenitor cells contributed to the observed differences in repair. Overall, our results indicate that the hybrid alginate/nanofiber mesh system is a promising growth factor delivery strategy for the repair of challenging bone injuries.

Impact and interest:

78 citations in Scopus
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68 citations in Web of Science®

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ID Code: 37829
Item Type: Journal Article
Keywords: Bone regeneration , Scaffold , Drug delivery , Bone morphogenetic protein , Nanofiber mesh , Alginate
DOI: 10.1016/j.biomaterials.2010.08.074
ISSN: 0142-9612
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomaterials (090301)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2010 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Biomaterials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Biomaterials, [VOL 32, ISSUE 1, (2011)] DOI: 10.1016/j.biomaterials.2010.08.074
Deposited On: 12 Oct 2010 09:29
Last Modified: 23 Oct 2013 13:53

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