Abstract
Osteoinductive capacity of demineralized bone matrix (DBM) is sometimes insufficient or shows high variability between different batches of DBM. Here, we tried to improve its osteoinductive activity by alkali-urea or trypsin treatment but this strategy was unsuccessful. Then, we tested the enrichment of DBM with a bone protein extract (BPE) containing osteogenic growth factors comparing two sources: cortical bone powder and DBM. The osteoinductive capacity (alkaline phosphatase activity) of the obtained BPEs was evaluated in vitro in C2C12 cells. Specific protein levels present in the different BPE was determined by enzyme-linked immunosorbent assay or by a multiplex assay. BPE from cortical bone powder showed a lack of osteoinductive effect, in agreement with the low content on osteoinductive factors. In contrast, BPE from DBM showed osteoinductive activity but also high variability among donors. Thus, we decided to enrich DBM with BPE obtained from a pool of DBM from different donors. Following this strategy, we achieved increased osteoinductive activity and lower variability among donors. In conclusion, the use of a BPE obtained from a pool of demineralized bone to enrich DBM could be used to increase its osteoinductive effect and normalize the differences between donors.
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Acknowledgements
This work was supported by the by the Instituto de Salud Carlos III, Ministerio de Economía y Competividad and ESF European Social Fund (Fondos FSE) (PI13/00372 and MS16/00124), the Programa Campus de Excelencia Internacional del Ministerio de Educación Cultura y Deporte (contract to M.M.), the Conselleria d’Educació, Cultura i Universitats del Govern de les Illes Balears (PD/018/2014).
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Ramis, J.M., Calvo, J., Matas, A. et al. Enhanced osteoinductive capacity and decreased variability by enrichment of demineralized bone matrix with a bone protein extract. J Mater Sci: Mater Med 29, 103 (2018). https://doi.org/10.1007/s10856-018-6115-8
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DOI: https://doi.org/10.1007/s10856-018-6115-8