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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The effect of an rhBMP-2 absorbable collagen sponge-targeted system on bone formation in vivo.
Biomaterials 2009 April
Reparation of bone defects remains a major clinical and economic concern, with more than 3 million bone grafts performed annually only in the United States and the EU. The search for alternatives to autologous bone grafting led to the approval by the FDA of an absorbable collagen carrier combined with rhBMP-2 for the treatment of certain bone diseases and fractures. The present work is focused on the production of a collagen-targeted rhBMP-2 based system to improve bone formation. We produced a modified rhBMP-2 with only an additional collagen-binding decapeptide derived from the von Willebrand factor and tested its affinity to collagen and its ability to induce ectopic bone formation in vivo when implanted in combination with absorbable collagen sponges or hydroxyapatite. The results showed not only that the rhBMP2-CBD had an increased affinity to collagen, but also that this binding was very stable during a prolonged period of time. In vivo experiments demonstrated that this rhBMP2-CBD maintained its osteoinductive activity, being capable of inducing new bone formation even at lower concentrations than native rhBMP-2. These results indicate that the combination of the fusion protein with absorbable collagen may be a suitable and safer alternative to rhBMP-2 for bone repair purposes.
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