title: Differential upregulation of the three transforming growth factor beta isoforms in human osteoarthritic cartilage.
abstract: OBJECTIVE
  Decreased levels of transforming growth factor beta (TGFbeta) have been related to the failure of cartilage repair in experimental models of osteoarthritis. This study aimed to examine this aspect of osteoarthritis in human cartilage.
  
  
  METHODS
  Cartilage samples were obtained from 11 patients with hip osteoarthritis and 11 patients with femoral neck fracture who were undergoing total hip replacement. Gene expression of the three TGFbeta isoforms, collagen type II (COL2A1) and aggrecan (AGC1) was analysed by reverse transcription quantitative PCR and immunohistochemistry.
  
  
  RESULTS
  Expression of the three TGFbeta isoforms was increased in osteoarthritis cartilage. The upregulation was more marked for the TGFbeta3 isoform (2.3-fold) than for TGFbeta1 (1.6-fold) or TGFbeta2 (1.7-fold). The messenger RNA levels of TGFbeta1 and TGFbeta2 were strongly correlated in osteoarthritis cartilage (r(s) = 0.83, p = 0.002), but levels of TGFbeta3 were uncorrelated with any of the two other TGFbeta isoforms. Immunohistochemistry showed an extension of immunoreactivity for the three TGFbeta isoforms to more chondrocytes and to deeper cartilage layers in the more severe osteoarthritis lesions. No correlation of TGFbeta isoforms with COL2A1 or AGC1 expression levels was found.
  
  
  CONCLUSIONS
  The three isoforms of TGFbeta were differentially upregulated in late osteoarthritis in relation to an increased percentage of TGFbeta-positive chondrocytes. These results indicate that cartilage damage progresses in spite of the TGFbeta stimulus for cartilage anabolism and that other causes of the failure to cope with the increased cartilage catabolism of osteoarthritis should be investigated.
authors.affiliation: Laboratorio Investigacion, Hospital Clinico Universitario de Santiago, Santiago de Compostela, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Pombo-Suarez
authors.forename: M T
authors.initials: MT
authors.lastname: Castaño-Oreja
authors.forename: M
authors.initials: M
authors.lastname: Calaza
authors.forename: J
authors.initials: J
authors.lastname: Gomez-Reino
authors.forename: A
authors.initials: A
authors.lastname: Gonzalez
mesh_terms: D002358:Cartilage, Articular / Q000378:metabolism*; D016022:Case-Control Studies; D003593:Cytoplasm / Q000737:chemistry / Q000378:metabolism; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D015207:Osteoarthritis, Hip / Q000378:metabolism*; D020033:Protein Isoforms / Q000032:analysis / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis*; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D018709:Statistics, Nonparametric; D016212:Transforming Growth Factor beta / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D015854:Up-Regulation
chemical_list: D020033:Protein Isoforms; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta