title: Comparison of osteoblast responses to hydroxyapatite and hydroxyapatite/soluble calcium phosphate composites.
abstract: Hydroxyapatite/soluble calcium phosphate composites (HAp/SCaP) are novel HAp-based materials with enhanced solubility that have been developed by annealing HAp in a vacuum. This study compared the effects of HAp and HAp/SCaP on osteoblast proliferation, differentiation, and mineralization using an MC3T3-E1 cell culture system. MC3T3-E1 cells were cultured on HAp or HAp/SCaP, and the number of attached cells and their morphology were examined. The influence of the extract from HAp/SCaP on osteoblast differentiation was determined by the measurement of alkaline phosphatase activity and reverse transcriptase-polymerase chain reaction analysis of the expression of osteoblastic markers. In addition, mineralization was evaluated by the staining of calcium deposits with Alizarin red. Attachment of a greater number of cells exhibiting no degeneration in their morphology was observed on HAp/SCaP compared with HAp after incubation for 7 days or more. Culturing cells with the extract from HAp/SCaP resulted in promotion of alkaline phosphatase activity, the expression of type I collagen, and bone-like tissue formation. The results of the present study indicate that HAp/SCaP shows greater ability in osteogenesis than HAp by increasing collagen synthesis and calcification of the extracellular matrix.
authors.affiliation: Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Korenori
authors.initials: K
authors.lastname: Ogata
authors.forename: Satoshi
authors.initials: S
authors.lastname: Imazato
authors.forename: Atsushi
authors.initials: A
authors.lastname: Ehara
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Ebisu
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Kinomoto
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Nakano
authors.forename: Yukichi
authors.initials: Y
authors.lastname: Umakoshi
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D002113:Calcification, Physiologic / Q000187:drug effects; D002130:Calcium Phosphates / Q000737:chemistry / Q000494:pharmacology*; D002448:Cell Adhesion / Q000187:drug effects; D002454:Cell Differentiation / Q000187:drug effects; D002457:Cell Extracts / Q000494:pharmacology; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D024042:Collagen Type I / Q000235:genetics; D017886:Durapatite / Q000737:chemistry / Q000494:pharmacology*; D005786:Gene Expression Regulation / Q000187:drug effects; D051379:Mice; D008855:Microscopy, Electron, Scanning; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects* / Q000648:ultrastructure; D010012:Osteogenesis / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012995:Solubility
chemical_list: D015415:Biomarkers; D002130:Calcium Phosphates; D002457:Cell Extracts; D024042:Collagen Type I; D012333:RNA, Messenger; D017886:Durapatite; C020243:calcium phosphate; D000469:Alkaline Phosphatase