title: Differentiation of preosteoblasts using a delivery system with BMPs and bioactive glass microspheres.
abstract: Bone morphogenetic proteins (BMPs) and 45S5 Bioglass microspheres (bioactive GM) can increase the differentiation of osteoblasts. Recombinant human BMP-2 (rhBMP-2) is presently the BMP most frequently used in delivery systems and it has already been used in clinical bone healing studies. We have developed a delivery system that combines a collagen Type I gel, BMP and bioactive GM. Since BMP-9 seems to be more osteogenic than BMP-2, we compared the differentiation of MC3T3-E1 preosteoblasts induced by our delivery system containing either a peptide derived from BMP-9 (pBMP-9), or rhBMP-2, both at 100 ng/mL. After 5 days, alkaline phosphatase staining showed that pBMP-9 induced more differentiation than rhBMP-2 in all experimental conditions. Also, bioactive GM increased this BMP effect. Since preosteoblasts secreted matrix metalloproteinases (MMPs) that can degrade collagen, we then studied the influence of the delivery system on MMPs production. We observed that MMP-2 was the major MMP involved in all experimental conditions. In addition, pBMP-9 with bioactive GM generated less MMP-2 than did rhBMP-2 on days 3 and 5. Thus, a delivery system using collagen Type I gel with pBMP-9 and bioactive GM seems to be a promising system for bone regeneration.
authors.affiliation: Laboratory of Cell-Biomaterial Biohybrid Systems, Université de Sherbrooke, Chemical Engineering Department, 2500, Université Blvd, Sherbrooke, Québec, Canada, J1K 2R1.
authors.forename: E
authors.initials: E
authors.lastname: Bergeron
authors.forename: M E
authors.initials: ME
authors.lastname: Marquis
authors.forename: I
authors.initials: I
authors.lastname: Chrétien
authors.forename: N
authors.initials: N
authors.lastname: Faucheux
mesh_terms: D016475:3T3 Cells; D000818:Animals; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000008:administration & dosage*; D018929:Cell Culture Techniques / Q000379:methods; D002454:Cell Differentiation / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002516:Ceramics; D016503:Drug Delivery Systems / Q000379:methods*; D005898:Glass / Q000737:chemistry*; D055427:Growth Differentiation Factor 2; D055412:Growth Differentiation Factors; D006801:Humans; D008422:Materials Testing; D051379:Mice; D008863:Microspheres; D010006:Osteoblasts / Q000166:cytology* / Q000187:drug effects / Q000502:physiology*; D010012:Osteogenesis / Q000187:drug effects / Q000502:physiology*; D010316:Particle Size; D013499:Surface Properties; D023822:Tissue Engineering / Q000379:methods; D016212:Transforming Growth Factor beta / Q000008:administration & dosage*
chemical_list: C525718:BMP2 protein, human; C525719:Bmp2 protein, mouse; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; C525887:GDF2 protein, human; C526108:Gdf2 protein, mouse; D055427:Growth Differentiation Factor 2; D055412:Growth Differentiation Factors; D016212:Transforming Growth Factor beta; C425330:bioactive glass 45S5