title: [Experimental study of the isolation, culture and in chondrogenic differentiation of human bone mesenchymal stem cell].
abstract: OBJECTIVE
  To study the isolation of human bone marrow mesenchymal stem cells (MSCs) and in vitro differentiation into chondrocytes as potential seed cell for condyle cartilage tissue engineering.
  
  
  METHODS
  Human MSCs were isolated by percoll solution from normal human bone marrow sample and cultured in flasks. Specific cell surface markers were identified by flow-cytometry. After the cells were treated with inductive medium containing insulin, transferrin, pyruvate, dexathemesone and TGF-beta for 7 - 14 days, microscopic, histological and immuno-histo-chemical studies were performed for chondrogenic phenotype identification.
  
  
  RESULTS
  Primary cultures of human MSCs express CD29 and CD44 positively and meanly, but CD34, CD45 and HLA-DR negatively. After 14 days of induction, the cells were positively stained by safranin O. Immunohistochemical analysis proved strong type II collagen expression.
  
  
  CONCLUSIONS
  Percoll helps to generate a better isolation of MSCs from human bone marrow aspirates with a purity more above 95%. The isolated MSCs can be expanded and induced in vitro to differentiate into chondrocytes by inductive medium.
authors.affiliation: Tissue Engineering Research Center, Institute of Basic Medical Science, Academy of Military Medical Sciences, Beijing 100850, China.
authors.forename: Xi-min
authors.initials: XM
authors.lastname: Guo
authors.forename: Chang-yong
authors.initials: CY
authors.lastname: Wang
authors.forename: Yong-hong
authors.initials: YH
authors.lastname: Wang
authors.forename: Cui-mi
authors.initials: CM
authors.lastname: Duan
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhao
authors.forename: Da-ming
authors.initials: DM
authors.lastname: Sun
mesh_terms: D001854:Bone Marrow Cells / Q000166:cytology*; D002358:Cartilage, Articular / Q000737:chemistry / Q000166:cytology; D018929:Cell Culture Techniques / Q000379:methods; D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D019902:Chondrocytes / Q000737:chemistry / Q000166:cytology*; D024043:Collagen Type II / Q000032:analysis; D003907:Dexamethasone / Q000494:pharmacology; D006801:Humans; D007150:Immunohistochemistry; D007328:Insulin / Q000494:pharmacology; D008648:Mesoderm / Q000166:cytology*; D011773:Pyruvates / Q000494:pharmacology; D013234:Stem Cells / Q000166:cytology*; D023822:Tissue Engineering / Q000379:methods; D014168:Transferrin / Q000494:pharmacology; D016212:Transforming Growth Factor beta / Q000494:pharmacology
chemical_list: D024043:Collagen Type II; D007328:Insulin; D011773:Pyruvates; D014168:Transferrin; D016212:Transforming Growth Factor beta; D003907:Dexamethasone