title: The ionic products of bioactive glass particle dissolution enhance periodontal ligament fibroblast osteocalcin expression and enhance early mineralized tissue development.
abstract: This study resulted in enhanced collagen type 1 and osteocalcin expression in human periodontal ligament fibroblasts (hPDLF) when exposed to bioactive glass conditioned media that subsequently may promote early mineralized tissue development. Commercial Bioglass™ (45S5) and experimental bioactive coating glass (6P53-b), were used to make a glass conditioned media (GCM) for comparison to control medium. ICP-MS analysis showed increased concentrations of Ca(2+), PO(4) (3-), Si(4+), and Na(+), for 45S5 GCM and Mg(2+), K(+), Ca(2+), PO(4)(3-), Si(4+), and Na(+) for 6P53-b GCM (relative to control medium). Differentiating hPDLF cultures exposed to 45S5 and 6P53-b GCM showed enhanced expression of collagen type 1 (Col1α1, Col1α2), osteocalcin, and alkaline phosphatase gene expression. These GCM also enhanced osteocalcin protein expression. After 16 d of culture, 45S5 and 6P53-b GCM treated cells showed regions of deep red Alizarin staining, indicating increased Ca within their respective extracellular matrices (ECM), while control-treated cells did not exhibit these features. SEM analysis showed more developed ECM in GCM treated cultures, indicated by multiple tissue layering and abundant collagen fiber bundle formation, while control treated cells did not exhibit these features. SEM analysis showed polygonal structures suggestive of CaP in 45S5 GCM treated cultures. These results indicate the osteogenic potential of bioactive coating glass in periodontal bone defect filling applications.
authors.affiliation: Division of Biomaterials and Bioengineering, University of California, San Francisco, California 94143-0758, USA. venu.varanasi@ucsf.edu
authors.forename: Venu G
authors.initials: VG
authors.lastname: Varanasi
authors.forename: Jeremy B
authors.initials: JB
authors.lastname: Owyoung
authors.forename: Eduardo
authors.initials: E
authors.lastname: Saiz
authors.forename: Sally J
authors.initials: SJ
authors.lastname: Marshall
authors.forename: Grayson W
authors.initials: GW
authors.lastname: Marshall
authors.forename: Peter M
authors.initials: PM
authors.lastname: Loomer
mesh_terms: D000469:Alkaline Phosphatase / Q000235:genetics / Q000378:metabolism; D001672:Biocompatible Materials / Q000494:pharmacology*; D024042:Collagen Type I / Q000235:genetics / Q000378:metabolism; D024043:Collagen Type II / Q000235:genetics / Q000378:metabolism; D017077:Culture Media, Conditioned / Q000494:pharmacology; D005347:Fibroblasts / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D005786:Gene Expression Regulation / Q000187:drug effects; D005898:Glass / Q000737:chemistry*; D006801:Humans; D007477:Ions; D008903:Minerals / Q000378:metabolism*; D015675:Osteocalcin / Q000235:genetics / Q000378:metabolism*; D010513:Periodontal Ligament / Q000166:cytology*; D013194:Staining and Labeling
chemical_list: D001672:Biocompatible Materials; D024042:Collagen Type I; D024043:Collagen Type II; D017077:Culture Media, Conditioned; D007477:Ions; D008903:Minerals; D015675:Osteocalcin; D000469:Alkaline Phosphatase