BMP-silk composite matrices heal critically sized femoral defects

C. Kirker-Head, V. Karageorgiou, S. Hofmann, R. Fajardo, O. Betz, H.P. Merkle, M. Hilbe, B. Rechenberg, von, J. McCool, L. Abrahamsen, A. Nazarian, E. Cory, M. Curtis, D.L. Kaplan, L. Meinel

Research output: Contribution to journalArticleAcademicpeer-review

126 Citations (Scopus)
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Abstract

Clinical drawbacks of bone grafting prompt the search for alternative bone augmentation technologies such as use of growth and differentiation factors, gene therapy, and cell therapy. Osteopromotive matrices are frequently employed for the local delivery and controlled release of these augmentation agents. Some matrices also provide an osteoconductive scaffold to support new bone growth. In this study, silkworm-derived silk fibroin was evaluated as an osteoconductive matrix for healing critical sized mid-femoral segmental defects in nude rats. Four treatment groups were assessed over eight weeks: silk scaffolds (SS) with recombinant human BMP-2 (rhBMP-2) and human mesenchymal stem cells (HMSC) that had been pre-differentiated along an osteoblastic lineage ex vivo (Group I; pdHMSC/rhBMP-2/SS); SS with rhBMP-2 and undifferentiated HMSCs (Group II; udHMSC/rhBMP-2/SS); SS and rhBMP-2 alone (Group III; rhBMP-2/SS); and empty defects (Group IV). Bi-weekly radiographs revealed a progressive and similar increase in Group I-III mean defect mineralization through post-operative week (POW) 8. Radiographs, dual energy x-ray absorptiometry, and micro-computed tomography confirmed that Groups I-III exhibited similar substantial and significantly (p
Original languageEnglish
Pages (from-to)247-255
Number of pages9
JournalBone
Volume41
Issue number2
DOIs
Publication statusPublished - 2007

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