title: [Expression of human bone morphogenetic protein 7 gene in adipose-derived stem cells and its effects on osteogenic phenotype].
abstract: OBJECTIVE
  To construct the eukaryotic expression vector of human bone morphogenetic protein 7 (hBMP-7) gene so as to observe its expression in rabbit adipose-derived stem cells (ADSCs) and its effects on osteogenic phenotype.
  
  
  METHODS
  Several healthy 3-month-old Japanese rabbits of clean grade were chosen, female or male and weighing 3-4 kg. ADSCs were isolated and cultured with collagenase digestion, then were detected and identified by CD44, CD49d, and CD106 immunofluorescence staining. The eukaryotic expression vector of hBMP-7 gene (pcDNA3.1-hBMP-7) was constructed, which was transfected into rabbit ADSCs (3rd passage) by Lipofectamine 2000 after identified, then the expression of hBMP-7 in transfected ADSCs was detected. The alkaline phosphatase (ALP) level and the collagen type I expression were detected by intracellular ALP spectrophotometry and immunofluorescence, respectively to assess the effect of hBMP-7 gene on the osteoblastic differentiation of ADSCs.
  
  
  RESULTS
  ADSCs mostly presented fusiform and polygon shape with positive expressions of CD44 and CD49d and negative expression of CD106. The eukaryotic expression vector of pcDNA3.1-hBMP-7 gene was successfully constructed and the expression of hBMP-7 was confirmed in ADSCs by immunohistochemical staining. The intracellular ALP quantitative detection showed that the activity of ALP was significantly higher in pcNDA3.1-hBMP-7 transfected group (experimental group) than in pcDNA3.1 transfected group (control group) at 7, 10, and 14 days after transfection (P < 0.05). The expression of collagen type I was higher in experimental group than in control group at 7 and 14 days after transfection (P < 0.05).
  
  
  CONCLUSIONS
  The eukaryotic expression vector of pcDNA3.1-hBMP-7 gene is successfully constructed, which can express in ADSCs. The expressions of collagen type I and ALP in experimental group are higher than those in control group, which lays a basis for the local gene therapy of skeletal regeneration.
authors.affiliation: Department of Arthroscopy and Sports Medicine, the Second Hospital of Inner Mongolia Medical College, Huhehot Inner Mongolia, 010030, P.R. China. poceidonone@sohu.com
authors.forename: Yizhong
authors.initials: Y
authors.lastname: Ren
authors.forename: Changxu
authors.initials: C
authors.lastname: Han
authors.forename: Yanbo
authors.initials: Y
authors.lastname: Jia
authors.forename: Heping
authors.initials: H
authors.lastname: Yin
authors.forename: Shuwen
authors.initials: S
authors.lastname: Li
mesh_terms: D017667:Adipocytes / Q000166:cytology; D000273:Adipose Tissue / Q000166:cytology; D000818:Animals; D055419:Bone Morphogenetic Protein 7 / Q000096:biosynthesis*; D019485:Bone Morphogenetic Proteins; D002454:Cell Differentiation; D002478:Cells, Cultured; D005260:Female; D005822:Genetic Vectors; D006801:Humans; D008297:Male; D010006:Osteoblasts / Q000166:cytology*; D010012:Osteogenesis; D011817:Rabbits; D013234:Stem Cells / Q000166:cytology* / Q000378:metabolism; D014162:Transfection
chemical_list: C525819:BMP7 protein, human; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins