Abstract
Collagen-hydroxyapatite (HA) scaffolds for the non-viral delivery of a plasmid encoding the osteoinductive protein bone morphogenetic protein (BMP)-7 were developed. The collagen-HA was obtained by the combination of calcium phosphate cement in a collagen template. The effect on cell behavior of increasing amounts of HA in the scaffolds was evaluated. Collagen-HA scaffolds containing 13, 23 or 83 wt% HA were prepared. Cell proliferation was reduced in the 83% HA scaffold after 1 day compared to 13 and 23% HA, but by 14 days the number of cells in 83% HA considerably increased. Alkaline phosphatase (ALP) activity was 8 times higher for the 83% HA scaffolds. BMP-7 plasmid was incorporated into the 83% HA scaffold. The transfection was low, although significant levels of BMP7 were expressed, associated with an increase in cell proliferation.
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Acknowledgments
This work was supported by the Spanish Ministry of Science and Education through project MAT2006-11516 and by the U.S. Department of Veterans Affairs, Veterans Health Administration, Rehabilitation Research and Development Service. The technical assistance of Alix Weaver greatly appreciated. The authors are grateful to Stryker Biotech, Hopkinton, MA for supplying the BMP-7 plasmid.
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Paper selected for publication from the 23rd European Conference on Biomaterials, Tampere, Finland, September 2010.
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Perez, R.A., Ginebra, M.P. & Spector, M. Cell response to collagen-calcium phosphate cement scaffolds investigated for nonviral gene delivery. J Mater Sci: Mater Med 22, 887–897 (2011). https://doi.org/10.1007/s10856-011-4308-5
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DOI: https://doi.org/10.1007/s10856-011-4308-5