title: Flow perfusion culture of human mesenchymal stem cells on silicate-substituted tricalcium phosphate scaffolds.
abstract: Autologous bone grafts are currently the gold standard for treatment of large bone defects, but their availability is limited due to donor site morbidity. Different substitutes have been suggested to replace these grafts, and this study presents a bone tissue engineered alternative using silicate-substituted tricalcium phosphate (Si-TCP) scaffolds seeded with human bone marrow-derived mesenchymal stem cells (hMSC). The cells were seeded onto the scaffolds and cultured either statically or in a perfusion bioreactor for up to 21 days and assessed for osteogenic differentiation by alkaline phosphatase activity assays and by quantitative real-time RT-PCR on bone markers. During culture, cells from the flow cultured constructs demonstrated improved proliferation and osteogenic differentiation verified by a more pronounced expression of several bone markers, e.g. alkaline phosphatase, osteopontin, Runx2, bone sialoprotein II, and bone morphogenetic protein 2. Cells and matrix were distributed homogeneously throughout the entire scaffold in flow culture, whereas only a peripheral layer was obtained after static culture. A viable and homogenous ex vivo bone construct with superior osteogenic properties was produced in dynamic culture and may provide a replacement for autologous grafts.
authors: Orthopaedic Research Laboratory, Laboratory for Molecular Orthopaedics, Aarhus University Hospital, Norrebrogade 44, Building 1A, 8000 Aarhus C, Denmark. l_bjerre@hotmail.com
authors: Lea
authors: L
authors: Bjerre
authors: Cody E
authors: CE
authors: Bünger
authors: Moustapha
authors: M
authors: Kassem
authors: Tina
authors: T
authors: Mygind
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D015415:Biomarkers; D019149:Bioreactors; D002130:Calcium Phosphates / Q000737:chemistry*; D002454:Cell Differentiation / Q000502:physiology*; D049109:Cell Proliferation; D002478:Cells, Cultured; D050659:Core Binding Factor Alpha 1 Subunit / Q000378:metabolism; D006801:Humans; D058574:Integrin-Binding Sialoprotein; D059630:Mesenchymal Stem Cells / Q000166:cytology / Q000502:physiology*; D008855:Microscopy, Electron, Scanning; D010012:Osteogenesis / Q000502:physiology; D053495:Osteopontin / Q000378:metabolism; D010477:Perfusion; D012795:Sialoglycoproteins / Q000378:metabolism; D017640:Silicates / Q000737:chemistry*; D013997:Time Factors; D023822:Tissue Engineering / Q000295:instrumentation / Q000379:methods; D054457:Tissue Scaffolds / Q000737:chemistry*; D014057:Tomography, X-Ray Computed
chemical_list: D015415:Biomarkers; D002130:Calcium Phosphates; D050659:Core Binding Factor Alpha 1 Subunit; C546871:IBSP protein, human; D058574:Integrin-Binding Sialoprotein; C493709:RUNX2 protein, human; D012795:Sialoglycoproteins; D017640:Silicates; D053495:Osteopontin; D000469:Alkaline Phosphatase; C018392:tricalcium phosphate