title: [An experimental study of tissue engineered autologous cartilage by using an injectable polymer].
abstract: OBJECTIVE
  To investigate the proper cell density of tissue engineered autologous cartilage to indicate the clinical application.
  
  
  METHODS
  The chondrocytes, isolated from mini swines' ears, were mixed with an injectable biocompatible matrix(Pluronic F127) to make the cell suspensions with the densities of 10,20, 30,40,50,60,70 x 10(6)/ml. The chondrocyte-polymer complex was injected into the subcutaneous tissue of the swines' abdomens. Each specimen was harvested and evaluated with body-mass, histological examination, and glycosaminoglycan content and type II collagen tests after 6 weeks in vivo.
  
  
  RESULTS
  The histological examination had showed that the neo-cartilage was solid, homogenous cartilage when using 50 million chondrocytess/cc for 6 weeks. The samples with the 10 and 30 million chondrocytes/cc showed that the area of the cartilage was incomplete and separated by the remnant polymer. The mass of the samples was ranged from 30-110 mg after 6 weeks. The glycosaminoglycan content was lower from 5.8 to 9.0 percent, compared to the 9.2 percent of the normal auricular cartilage. Western-Blot had presented the type II collagen in all samples.
  
  
  CONCLUSIONS
  This study has demonstrated that the qutologous cartilage could be generated by using tissue engineering technique, with the histological characteristics similar to natural cartilage. Fifty million chondrocytes per cc could yield the best quality cartilage in 6 weeks.
authors.affiliation: Research Center of Tissue Engineering, Department of Plastic Surgery, Shanghai Ninth People's Hospital, Shanghai Second Medical University, Shanghai 200011, China.
authors.forename: W
authors.initials: W
authors.lastname: Xia
authors.forename: Y
authors.initials: Y
authors.lastname: Cao
authors.forename: Q
authors.initials: Q
authors.lastname: Shang
mesh_terms: D000818:Animals; D002356:Cartilage; D002452:Cell Count; D019902:Chondrocytes / Q000166:cytology*; D005260:Female; D008297:Male; D020442:Poloxamer / Q000008:administration & dosage*; D013556:Swine, Miniature; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D020442:Poloxamer