Journal of Biomedical Materials Research - Part A
Journal of Biomedical Materials Research - Part A
5 years ago

Superior bone-inducing potential of rhBMP9 compared to rhBMP2

Yufeng Zhang, Benoit Schaller, Nikola Saulacic, Richard J. Miron, Mustafa Abd El Raouf, Eizaburo Kobayashi, Masako Fujioka-Kobayashi
Recombinant human bone morphogenic protein (rhBMP) 9 has recently been reported to have more osteopromotive potential in vitro when compared to rhBMP2. The aim of the present study was to investigate the bone-inducing potential of rhBMP2 and rhBMP9. We compared rhBMP2, rhBMP7 and rhBMP9 at 5 different concentrations and showed convincingly that rhBMP9 possesses much greater potential for osteoblast differentiation even at 20 times lower concentrations in vitro. We further show that Noggin, an inhibitor for rhBMP2-induced osteogenesis, did not alter rhBMP9-induced osteogenesis. Thereafter, we show for the first time that rhBMP9 loaded onto atelo-collagen membranes is osteoinductive and has greater potential to form ectopic bone formation when compared to rhBMP2 even at 4 times lower doses. Similarly new bone formation of rhBMP2 and 9 when loaded on deproteinized bovine bone mineral (DBBM) was investigated in a rabbit calvarial defect. At 8 weeks, both rhBMP2 and rhBMP9 induced significantly higher new bone formation when compared to DBBM alone samples. Interestingly, once again 4 times lower dose of rhBMP9 group induced comparable or even higher levels of new bone height and new bone area when compared to the rhBMP2 group. The present study revealed that 1) rhBMP9 is capable of inducing ectopic new bone formation in vivo and 2) up to 4 times lower doses of rhBMP9 may be utilized to regenerate same-size bone defects when compared to rhBMP2. This article is protected by copyright. All rights reserved.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/jbm.a.36359

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