title: [Effects of secretive bone morphogenetic protein 2 induced by gene transfection on the biological changes of NIH3T3 cells].
abstract: BACKGROUND
  Bone morphogenetic proteins (BMPs), which belong to the transforming growth factor beta superfamily, are powerful regulators of cartilage and bone formation. This study investigated the biological changes of NIH3T3 cells incubated with secretive BMP2 that was induced by gene transfection through transwell.
  
  
  METHODS
  Eukaryonic expression vector (pcDNA3.1-B2) was transfered into NIH3T3 cells with Sofast, a positive compound transfection agent. The positive cell clones were selected with G418. The cytoplasmic and extracellular expressions of BMP2 were determined by immunohistochemical stain and enzyme-linked immunosorbent assay. NIH3T3 cells were co-cultured with hBMP2 gene transfecting cells through transwell, and the ultrastructure, alkaline phosphatase activity and the expression of osteocalcin (the marker of osteogenetic differentiation) changes were observed.
  
  
  RESULTS
  There were cytoplasmic and extracellular expressions of BMP2 in transfecting NIH3T3 cells. The ultrastructural changes, the high activity of alkaline phosphatase and the positive stain of osteocalcin suggested the osteogenetic differentiation tendency of NIH3T3 cells co-cultured with transfecting NIH3T3 cells.
  
  
  CONCLUSIONS
  Secretive BMP2 that is induced by gene transfection could promote the osteogenetic differentiation of fibroblast cells.
authors.affiliation: Department of Periodontology, Stomatological College, Nanjing Medical University, Nanjing 210029, China. wbsun@njmu.edu.cn
authors.forename: Wei-bin
authors.initials: WB
authors.lastname: Sun
authors.forename: Juan
authors.initials: J
authors.lastname: Wang
authors.forename: Chun
authors.initials: C
authors.lastname: Lu
authors.forename: Gui-xia
authors.initials: GX
authors.lastname: Tang
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins / Q000032:analysis / Q000235:genetics*; D002454:Cell Differentiation; D004797:Enzyme-Linked Immunosorbent Assay; D005347:Fibroblasts / Q000166:cytology; D007150:Immunohistochemistry; D051379:Mice; D046529:Microscopy, Electron, Transmission; D041681:NIH 3T3 Cells; D015675:Osteocalcin / Q000032:analysis; D010012:Osteogenesis; D014162:Transfection; D016212:Transforming Growth Factor beta / Q000032:analysis / Q000235:genetics*
chemical_list: C525719:Bmp2 protein, mouse; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D016212:Transforming Growth Factor beta; D015675:Osteocalcin; D000469:Alkaline Phosphatase