Effect of an injectable 3D scaffold for osteoblast differentiation depends on bead size.
The objective of this study was to evaluate the effect of beta-tricalcium phosphate (beta-TCP) bead size on the behavior of KUSA/A1 mouse osteoblasts when the beta-TCP beads are used as the solid phase of a scaffold in which alginate was used as the gel phase. KUSA/A1 cells were loaded onto a three-dimensional (3D) scaffold fabricated from beta-TCP beads with diameters ranging from 300 to 500 microm (small beads), 500-700 microm (medium beads) and 700-850 microm (large beads); cells were cultured for 3, 7 and 14 days. Scanning electron microscope observations showed that each bead was connected in a network consisting of the alginate gel and KUSA/A1 cellular matrix that was tightly bonded to form a 3D structure. After 3 days, cells in the 3D scaffold with medium beads had a significantly higher alkaline phosphatase activity (ALP) than cells in the other scaffolds. However, by 7 and 14 days in culture there was no significant difference in DNA levels, ALP activity or osteocalcin expression. At 8 weeks, only the composite containing small beads and KUSA/A1 cells had turned completely into bone in vivo. Thus, bead size may influence the success of bone formation in this context.
Hashimoto
Yoshiya
Y
Department of Biomaterials, Osaka Dental University, Osaka, Hirakata, Osaka, Japan. yoshiya@cc.osaka-dent.ac.jp
Adachi
Seita
S
Matsuno
Tomonori
T
Omata
Kazuhiko
K
Yoshitaka
Yamauchi
Y
Ozeki
Yasuyuki
Y
Umezu
Yoshikazu
Y
Satoh
Tazuko
T
Nakamura
Masaaki
M
D000818:Animals; D018786:Bone Substitutes / Q000008:administration & dosage / Q000737:chemistry*; D002130:Calcium Phosphates / Q000008:administration & dosage / Q000737:chemistry*; D002454:Cell Differentiation; D002460:Cell Line; D002478:Cells, Cultured; D048091:Guided Tissue Regeneration / Q000295:instrumentation* / Q000379:methods; D007267:Injections; D008422:Materials Testing; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000502:physiology; D051379:Mice; D008819:Mice, Nude; D010006:Osteoblasts / Q000166:cytology* / Q000502:physiology; D010012:Osteogenesis / Q000502:physiology*; D054457:Tissue Scaffolds
D018786:Bone Substitutes; D002130:Calcium Phosphates; C485817:beta-tricalcium phosphate