title: Osteoblast viability and differentiation with Me2SO as cryoprotectant compared to osteoblasts from fresh human iliac cancellous bone.
abstract: The aim of this study was to compare the viability of human osteoblasts cryopreserved with Me2SO to that of fresh human iliac cancellous bone using cell culture techniques. Osteoblasts were obtained by spontaneous outgrowth of human iliac cancellous bone specimens in experiment I. In experiment II, human iliac cancellous bone was frozen with 10% Me2SO at -80 degrees C for 2 weeks and osteoblasts grew spontaneously after thawing at 37 degrees C by removing Me2SO with sucrose. The cells were grown in culture flasks containing DMEM as a culture medium, supplemented with 10% fetal calf serum. They were kept at 37 degrees C in a humidified atmosphere of 95% air and 5% CO2. Cells from the second passage were plated at a density of 5 times 10(3) cells/cm2 in 24-well plates. For detection of viability and differentiation, WST-1 assay, determination of alkaline phosphatase activity, concentration of procollagen I peptide, concentration of osteocalcin, and indirect immunofluorescence for osteopontin, collagen type I, integrin beta1, and fibronectin were applied. Experiments were conducted at four stages of confluence (days 4, 7, 14, and 21 after plating the cells). Based on the results of this study, we conclude that osteoblast-like cells survived cryopreservation and synthesized a range of markers that were consistent with this cell type.
authors.affiliation: Department of Craniomaxillofacial and Plastic Surgery, University of Cologne, Kerpener Strasse 62, 50931 Cologne, Germany. t.reuther@uni-koeln.de
authors.forename: Tobias
authors.initials: T
authors.lastname: Reuther
authors.forename: Danyel
authors.initials: D
authors.lastname: Rohmann
authors.forename: Martin
authors.initials: M
authors.lastname: Scheer
authors.forename: Alexander C
authors.initials: AC
authors.lastname: Kübler
mesh_terms: D000328:Adult; D000469:Alkaline Phosphatase / Q000378:metabolism; D002454:Cell Differentiation; D049109:Cell Proliferation; D002470:Cell Survival; D002478:Cells, Cultured; D024042:Collagen Type I / Q000378:metabolism; D015925:Cryopreservation / Q000379:methods*; D003451:Cryoprotective Agents; D004121:Dimethyl Sulfoxide; D019084:Fluorescent Antibody Technique, Indirect; D006801:Humans; D007085:Ilium / Q000166:cytology; D066298:In Vitro Techniques; D008875:Middle Aged; D010006:Osteoblasts / Q000166:cytology* / Q000378:metabolism; D015675:Osteocalcin / Q000378:metabolism
chemical_list: D024042:Collagen Type I; D003451:Cryoprotective Agents; D015675:Osteocalcin; D000469:Alkaline Phosphatase; D004121:Dimethyl Sulfoxide