It has been reported that bone morphogenetic protein (BMP)-9 has potent osteoinductive properties among the BMP family by adenovirus-transfection experiments. We very recently reported that absorbable collagen sponge (ACS) as a carrier for recombinant human (rh) BMP-9, compared with chitosan sponge, was suitable for inducing bone healing/regeneration by BMP-9 in a rat calvarial defect model. The aim of this study was to evaluate different doses of rhBMP-9/ACS on new bone formation in rat critical size calvarial defects.
Materials and methods
Bilateral calvarial defects (n = 32) were surgically created in 16 wistar rats and randomly filled with one of the following materials: (1) absorbable collagen sponge (ACS) alone; (2) 1 μg-rhBMP-9/ACS (L-rhBMP-9/ACS); (3) 5 μg-rhBMP-9/ACS (H-rhBMP-9/ACS); and (4) blank defects (control). The animals were sacrificed 8 weeks postsurgery for radiographic and histomorphometric analyses.
Bone volume and defect closure were statistically higher in the rhBMP-9/ACS-implanted (L-rhBMP-9/ACS and H-rhBMP-9/ACS) groups when compared with ACS-alone group (p < 0.05). Furthermore, defects filled with H-rhBMP-9/ACS showed the highest levels of newly formed bone area (NBA) and NBA/total defect area among all groups. No significant differences in any of the radiographic and histometric parameters could be observed between both concentrations of rhBMP-9.
Within the limits of this study, it can be concluded that rhBMP-9/ACS-induced bone formation can be reached with as little as 1 μg/site in rat critical size calvarial defects.
RhBMP-9 could be a potential therapeutic growth factor for future bone regenerative procedures.
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Conflict of interest
The authors declare no conflicts of interests.
This study was supported by Grants-in-Aid for Scientific Research (B) (no. 24792147) and (C) (no. 26462972) from the Japan Society for the Promotion of Science (JSPS).
All animal experimental protocols and procedures were approved by the Ethical Committee of the Animal Research Center of Kagoshima University, Japan (D14022).
Informed consent was not required in this study.
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Nakamura, T., Shirakata, Y., Shinohara, Y. et al. Osteogenic potential of recombinant human bone morphogenetic protein-9/absorbable collagen sponge (rhBMP-9/ACS) in rat critical size calvarial defects. Clin Oral Invest 21, 1659–1665 (2017). https://doi.org/10.1007/s00784-016-1963-4
- Growth factor
- Bone morphogenetic protein-9
- Bone formation