title: In-vitro osteogenesis of synovium stem cells induced by controlled release of bisphosphate additives from microspherical mesoporous silica composite.
abstract: In this study, in-vitro osteogenesis was successfully induced in the highly chondrogenic synovium mesenchymal stem cells (SMSCs) by controlled release of a nitrogenous bisphosphonate additive--alendronate (AL) from a mesoporous silica (MS)-hydroxyapatite (HA) composite that was mediated in poly(lactic-co-glycolic acid) (PLGA) microspheres. This microspherical based controlled release system is constructed with three levels of degradable structures: (1) the AL drug was first hybridized with HA nanoparticles; (2) the HA-AL complexes were filled into the mesopores of MS particles by self-assembly in situ; and (3) the HA-AL-laden MS constructs (MSH-AL) were built in the bulk of PLGA microspheres. In comparison with any mono-component construct, the superiority of this multi-component system comes from two aspects of functionalities: (1) significantly greater loading capacity of the extremely hydrophilic drug-AL; and (2) better controlled profile of AL release. Based on this newly developed PLGA/MSH-AL releasing system, as recipients the SMSCs, which usually exhibit exclusively high chondrogenesis, demonstrated a strong osteogenic commitment. The results were verified by alkaline phosphatase (ALP) activity assay, calcium secretion assay, real time PCR and immunohistochemistry analysis. Considering the renewable source and high proliferative profile of SMSCs, the achievement of engineered SMSC osteogenesis with this PLGA/MSH-AL controlled release system would open a new door to major bony reparation and regeneration.
authors.affiliation: School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.
authors.forename: Xuetao
authors.initials: X
authors.lastname: Shi
authors.forename: Yingjun
authors.initials: Y
authors.lastname: Wang
authors.forename: Rohan R
authors.initials: RR
authors.lastname: Varshney
authors.forename: Li
authors.initials: L
authors.lastname: Ren
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang
authors.forename: Dong-An
authors.initials: DA
authors.lastname: Wang
mesh_terms: D019386:Alendronate / Q000008:administration & dosage / Q000494:pharmacology; D000818:Animals; D050071:Bone Density Conservation Agents / Q000008:administration & dosage / Q000494:pharmacology; D002478:Cells, Cultured; D004337:Drug Carriers / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry; D019344:Lactic Acid / Q000737:chemistry; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000187:drug effects; D008863:Microspheres; D010012:Osteogenesis / Q000187:drug effects / Q000502:physiology*; D010712:Phosphatidic Acids / Q000008:administration & dosage / Q000494:pharmacology*; D011100:Polyglycolic Acid / Q000737:chemistry; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011817:Rabbits; D012822:Silicon Dioxide / Q000737:chemistry; D013583:Synovial Membrane / Q000166:cytology*
chemical_list: D050071:Bone Density Conservation Agents; D004337:Drug Carriers; D010712:Phosphatidic Acids; C021632:bisphosphatidic acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D012822:Silicon Dioxide; D017886:Durapatite; D019386:Alendronate