Characterization of zinc-releasing three-dimensional bioactive glass scaffolds and their effect on human adipose stem cell proliferation and osteogenic differentiation.
While the addition of zinc ions to bioactive ceramics has been shown to enhance the proliferation and osteogenic differentiation of osteoblast-like cells, contradictory results have been found. Therefore, the effect of zinc-releasing ceramics on cell proliferation and differentiation into osteogenic lineages requires further clarification. The aim of this study was to evaluate the effects of zinc addition on the degradation profile of three-dimensional bioactive glass scaffold, and on the proliferation and osteogenesis of human adipose stem cells (hASCs) in these scaffolds. Bioactive glass scaffolds containing Na(2)O, K(2)O, MgO, CaO, B(2)O(3), TiO(2), P(2)O(5) and SiO(2) were prepared. The degradation was evaluated by weight loss measurement, scanning electron microscopy and elemental analysis. The degradation profile of bioactive glass was shown to slow down with the addition of zinc. Qualitative live/dead staining showed that zinc addition to bioactive glass inhibits cell spreading and proliferation of hASCs. However, zinc addition had no significant effect on DNA content, alkaline phosphatase activity and osteopontin concentration of hASCs when measured quantitatively. Our results suggest that the possible stimulatory effect of addition of zinc on hASC proliferation and osteogenesis was not detected because addition of zinc slowed down the degradation rate of the studied bioactive glass scaffolds.
Regea Institute for Regenerative Medicine, University of Tampere, Biokatu 12, 33520 Tampere, Finland. suvi.haimi@regea.fi
Suvi
S
Haimi
Giada
G
Gorianc
Loredana
L
Moimas
Bettina
B
Lindroos
Heini
H
Huhtala
Sari
S
Räty
Hannu
H
Kuokkanen
George K
GK
Sándor
Chiara
C
Schmid
Susanna
S
Miettinen
Riitta
R
Suuronen
D017667:Adipocytes / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D018786:Bone Substitutes / Q000737:chemistry*; D018929:Cell Culture Techniques / Q000379:methods; D002454:Cell Differentiation / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D005260:Female; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D010006:Osteoblasts / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D010012:Osteogenesis / Q000502:physiology*; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000502:physiology; D023822:Tissue Engineering / Q000379:methods; D015032:Zinc / Q000737:chemistry / Q000494:pharmacology*
D018786:Bone Substitutes; D015032:Zinc