Restricted accessResearch articleFirst published online 2012-11
Composite membranes of poly(lactic acid) with zinc-added bioactive glass as a guiding matrix for osteogenic differentiation of bone marrow mesenchymal stem cells
This study aims to produce a degradable and bone-bioactive membrane for guiding bone regeneration by combining a degradable polymer, poly(lactic acid) (PLA), with a bioactive inorganic zinc-containing bioactive glass (ZnBG). The in vitro osteogenic development of rat bone marrow mesenchymal stem cells (rBMSCs) upon different membrane substrates (pure PLA control, PLA–BG, and PLA–ZnBG) was investigated in terms of bone cell phenotype syntheses and mineralization. Results showed significantly stimulated production of alkaline phosphatase and osteocalcin at days 14 and 21 in the membranes containing BG and ZnBG, with more in the samples containing ZnBG. The addition of ZnBG in PLA allowed the rBMSCs to express a high level of bone sialoprotein as confirmed by immunostaining. Cellular mineralization of the secreted extracellular matrix showed a significantly higher Ca level on the BG- and ZnBG-added membrane than on the PLA, and the more so in the ZnBG-added one. Based on the in vitro assessments using rBMSCs, the ZnBG-added PLA is considered to be of potential use in guiding active bone regeneration within the periodontal pocket.
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