title: Influence of cell culture medium composition on in vitro dissolution behavior of a fluoride-containing bioactive glass.
abstract: Bioactive glasses are used clinically for bone regeneration, and their bioactivity and cell compatibility are often characterized in vitro, using physiologically relevant test solutions. The aim of this study was to show the influence of varying medium characteristics (pH, composition, presence of proteins) on glass dissolution and apatite formation. The dissolution behavior of a fluoride-containing bioactive glass (BG) was investigated over a period of one week in Eagle's Minimal Essential Medium with Earle's Salts (MEM), supplemented with either, (a) acetate buffer, (b) 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) buffer, (c) HEPES + carbonate, or (d) HEPES + carbonate + fetal bovine serum. Results show pronounced differences in pH, ion release, and apatite formation over 1 week: Despite its acidic pH (pH 5.8 after BG immersion, as compared to pH 7.4-8.3 for HEPES-containing media), apatite formation was fastest in acetate buffered (HEPES-free) MEM. Presence of carbonate resulted in formation of calcite (calcium carbonate). Presence of serum proteins, on the other hand, delayed apatite formation significantly. These results confirm that the composition and properties of a tissue culture medium are important factors during in vitro experiments and need to be taken into consideration when interpreting results from dissolution or cell culture studies.
authors.affiliation: School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS, United Kingdom; Department of Biomaterials, Sahlgrenska Academy at University of Gothenburg, Box 412, SE-405 30, Göteborg, Sweden.
authors.forename: Furqan A
authors.initials: FA
authors.lastname: Shah
authors.forename: Delia S
authors.initials: DS
authors.lastname: Brauer
authors.forename: Rory M
authors.initials: RM
authors.lastname: Wilson
authors.forename: Robert G
authors.initials: RG
authors.lastname: Hill
authors.forename: Karin A
authors.initials: KA
authors.lastname: Hing
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D003470:Culture Media / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012995:Solubility
chemical_list: D001672:Biocompatible Materials; D003470:Culture Media; D005459:Fluorides
keywords: bioactive glass; bioactivity; cell culture medium; fluoride; in vitro