Osteoblast response to bioactive glasses in vitro correlates with inorganic phosphate content

S. Lossdörfer, Z. Schwartz, C. H. Lohmann, D. C. Greenspan, D. M. Ranly, B. D. Boyan

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


Inorganic phosphate (Pi) is a physiological regulator of osteoblasts and chondrocytes, suggesting that phosphate may contribute to the biological response of these cells to bioactive glasses like Bioglass® 45S5, which is composed of 45% SiO2, 24.5% CaO, 24.5% Na2O, and 6% P 2O5. We investigated the effect of varying the Pi content of bioactive glass disks (0%, 3%, 6% and 12% P2O5) using human osteoblast-like MG63 cells as the model. Cell number on 6% Pi disks was comparable to cultures on tissue culture plastic, but was reduced at higher and lower Pi concentrations. Alkaline phosphatase specific activity of isolated cells and cell layer lysates, as well as PGE2, TGF-β 1 and NO levels in conditioned media, were elevated in cultures grown on bioactive glass and varied with the Pi content. The greatest effects were observed in cultures grown on disks with the lowest Pi concentrations. Thus, growth on the bioactive glasses enhances cell function in comparison with tissue culture plastic and lower Pi content favors osteoblast differentiation.

Original languageEnglish (US)
Pages (from-to)2547-2555
Number of pages9
Issue number13
StatePublished - Jun 2004


  • Bioactive glass
  • Bioglass®
  • Differentiation
  • In vitro
  • Inorganic phosphate
  • Local factor production
  • MG63 osteoblast-like cells
  • Proliferation

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Ceramics and Composites
  • Biomaterials
  • Mechanics of Materials


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