title: Culture & differentiation of mesenchymal stem cell into osteoblast on degradable biomedical composite scaffold: In vitro study.
abstract: OBJECTIVE
  There is a significant bone tissue loss in patients from diseases and traumatic injury. The current autograft transplantation gold standard treatment has drawbacks, namely donor site morbidity and limited supply. The field of tissue engineering has emerged with a goal to provide alternative sources for transplantations to bridge this gap between the need and lack of bone graft. The aim of this study was to prepare biocomposite scaffolds based on chitosan (CHT), polycaprolactone (PCL) and hydroxyapatite (HAP) by freeze drying method and to assess the role of scaffolds in spatial organization, proliferation, and osteogenic differentiation of human mesenchymal stem cells (hMSCs) in vitro, in order to achieve bone graft substitutes with improved physical-chemical and biological properties.
  
  
  METHODS
  Pure chitosan (100CHT) and composites (40CHT/HAP, 30CHT/HAP/PCL and 25CHT/HAP/PCL scaffolds containing 40, 30, 25 parts per hundred resin (phr) filler, respectively) in acetic acid were freeze dried and the porous foams were studied for physicochemical and in vitro biological properties.
  
  
  RESULTS
  Scanning electron microscope (SEM) images of the scaffolds showed porous microstructure (20-300 μm) with uniform pore distribution in all compositions. Materials were tested under compressive load in wet condition (using phosphate buffered saline at pH 7.4). The in vitro studies showed that all the scaffold compositions supported mesenchymal stem cell attachment, proliferation and differentiation as visible from SEM images, [3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium bromide] (MTT) assay, alkaline phosphatase (ALP) assay and quantitative reverse transcription (qRT)-PCR.
  
  
  CONCLUSIONS
  Scaffold composition 25CHT/HAP/PCL showed better biomechanical and osteoinductive properties as evident by mechanical test and alkaline phosphatase activity and osteoblast specific gene expression studies. This study suggests that this novel degradable 3D composite may have great potential to be used as scaffold in bone tissue engineering.
authors.forename: Krishan G
authors.initials: KG
authors.lastname: Jain
authors.affiliation: Stem Cell Facility, All India Institute of Medical Sciences, New Delhi, India.
authors.forename: Sujata
authors.initials: S
authors.lastname: Mohanty
authors.forename: Alok R
authors.initials: AR
authors.lastname: Ray
authors.forename: Rajesh
authors.initials: R
authors.lastname: Malhotra
authors.forename: Balram
authors.initials: B
authors.lastname: Airan
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D002454:Cell Differentiation; D002478:Cells, Cultured; D048271:Chitosan; D017886:Durapatite; D006801:Humans; D066298:In Vitro Techniques; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000201:enzymology; D008855:Microscopy, Electron, Scanning; D010006:Osteoblasts / Q000166:cytology*; D011091:Polyesters; D054457:Tissue Scaffolds
chemical_list: D011091:Polyesters; C016240:polycaprolactone; D048271:Chitosan; D017886:Durapatite; D000469:Alkaline Phosphatase
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