title: Accelerated osteoblast mineralization on a conductive substrate by multiple electrical stimulation.
abstract: One of the major benefits of a conductive PPy-based substrate is that the mediated electrical stimulation (ES) can be a stimulating factor to promote tissue regeneration. We cultured osteoblast-like Saos-2 cells on a conductive substrate made of biodegradable polylactide (95 wt%) and electrically conducting polypyrrole bioactivated with heparin (PPy/HE) (5 wt%). Using multi-well electrical cell culture plates, the effect of multiple ESs on osteoblast mineralization was investigated at various culture times. As ascertained by ARS, CPC and XPS analyses, the ES was able to promote osteoblast adhesion and growth, resulting in significantly higher calcium and phosphate content in the mineral deposition of the electrically stimulated membranes. Morphology, Ca/P ratio and crystalline structure demonstrated that the minerals on the conductive substrate surface were similar to those found on typical hydroxyapatite. ES also significantly upregulated the expression of the osteoblast-specific markers ALP, BMP2, Runx2 and OC. ES through a synthetic conductive polymer substrate therefore represents a vital option to promote bone regeneration.
authors.affiliation: Département de chirurgie, Faculté de médecine, Université Laval, Centre de recherche de l'Hôpital Saint-François d'Assise, CHUQ, Québec, QC, Canada.
authors.forename: Shiyun
authors.initials: S
authors.lastname: Meng
authors.forename: Ze
authors.initials: Z
authors.lastname: Zhang
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Rouabhia
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D055396:Bone Morphogenetic Protein 2 / Q000235:genetics; D001842:Bone and Bones / Q000166:cytology* / Q000378:metabolism*; D045744:Cell Line, Tumor; D050659:Core Binding Factor Alpha 1 Subunit / Q000235:genetics; D004558:Electric Stimulation / Q000379:methods*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D010006:Osteoblasts / Q000166:cytology* / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: C525718:BMP2 protein, human; D001672:Biocompatible Materials; D055396:Bone Morphogenetic Protein 2; D050659:Core Binding Factor Alpha 1 Subunit; C493709:RUNX2 protein, human