title: Enhancing the osteoinductive properties of hydroxyapatite by the addition of human mesenchymal stem cells, and recombinant human osteogenic protein-1 (BMP-7) in vitro.
abstract: Hydroxyapatite (HA) has been widely used as a bone graft substitute. In this study, we investigated whether the addition of osteogenic protein-1 (OP-1) further enhanced the weak osteoinductive properties of hydroxyapatite when loaded with human mesenchymal stem cells (h-MSCs). Over a 14 day period, cell proliferation in both groups was assessed qualitatively using SEM and quantitatively using alamar blue assay. Cell differentiation was also evaluated by measurement of ALP activity, which was expressed against total DNA. HA/MSC loaded with OP-1 demonstrated a statistically significant increase (p<0.001) in cell proliferation at all time points in comparison to unloaded samples. ALP activity per DNA was also significantly enhanced (p<0.001) in loaded samples when compared to unloaded controls. SEM demonstrated increased cellular attachment and proliferation into HA pores at all time points in the loaded samples. Our study suggests that the osteoinductive potential of HA can be improved in vitro by the combined incorporation of MSCs and OP-1.
authors.affiliation: Department of Biomaterial and Biomimetics, Guy's, King's and St. Thomas' Dental Institute, University of London, London SE1 1UL, UK. etsiridis@doctors.org.uk
authors.forename: Eleftherios
authors.initials: E
authors.lastname: Tsiridis
authors.forename: Amit
authors.initials: A
authors.lastname: Bhalla
authors.forename: Zubier
authors.initials: Z
authors.lastname: Ali
authors.forename: Neelam
authors.initials: N
authors.lastname: Gurav
authors.forename: Manolis
authors.initials: M
authors.lastname: Heliotis
authors.forename: Sanjukta
authors.initials: S
authors.lastname: Deb
authors.forename: Lucy
authors.initials: L
authors.lastname: DiSilvio
mesh_terms: D000328:Adult; D001672:Biocompatible Materials / Q000494:pharmacology*; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins / Q000502:physiology*; D001861:Bone Regeneration / Q000502:physiology*; D002454:Cell Differentiation; D049109:Cell Proliferation; D017886:Durapatite / Q000494:pharmacology*; D006801:Humans; D008297:Male; D059630:Mesenchymal Stem Cells; D010006:Osteoblasts / Q000502:physiology; D023822:Tissue Engineering / Q000379:methods
chemical_list: C525819:BMP7 protein, human; D001672:Biocompatible Materials; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins; D017886:Durapatite