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• W2018407045 abstract "ObjectiveAutologous chondrocyte implantation is a cell-based treatment to repair articular cartilage defects, relying on the availability of expanded (de-differentiated) chondrocytes. Unfortunately, the expansion process causes several phenotypical changes, requiring re-establishment of the native chondrogenic phenotype to sustain proper repair. Among other proteins, transforming growth factor-β (TGFβ) is known to influence the chondrogenic re-differentiation of human articular chondrocytes (HACs) and their matrix deposition. Thus we investigated the effects of TGFβ-depletion during the expansion phase.DesignHACs were isolated from articular cartilage and expanded in the canonical serum-supplemented medium [fetal calf serum (FCS)] or in a chemically-defined (CD) medium, with or without anti-TGFβ antibody administration. The re-differentiation potential of the cells was assessed by pellet cultures, gene expression analysis and histology.ResultsCell proliferation proceeded more rapidly in CD-medium than in FCS-medium; it was not affected by the use of anti-TGFβ antibody but was further increased by addition of exogenous TGFβ1, via increased p-Smad1/5/8. Conversely, in FCS-medium, addition of anti-TGFβ antibody decreased both proliferation and p-Smad1/5/8 level. Challenging either FCS- or CD-medium with anti-TGFβ antibody during expansion enhanced chondrogenesis in the subsequent pellet cultures. Moreover, TGFβ-depletion during expansion in CD-medium inhibited mRNA expression of hypertrophic markers, collagen type-X (COL10) and matrix metalloproteinase-13 (MMP-13). Interestingly, the TGFβ1 level detected by enzyme-linked immunosorbent sandwich assay (ELISA) during cell expansion was correlated with COL10 mRNA expression after re-differentiation.ConclusionTGFβ-depletion during expansion improves the re-differentiation capacity of chondrocytes and inhibits hypertrophy. These results indicate the importance of the expansion medium composition to improve chondrogenic re-differentiation and to inhibit hypertrophy." @default.
• W2018407045 created "2016-06-24" @default.
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• W2018407045 date "2012-10-01" @default.
• W2018407045 modified "2023-10-04" @default.
• W2018407045 title "TGFβ inhibition during expansion phase increases the chondrogenic re-differentiation capacity of human articular chondrocytes" @default.
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• W2018407045 doi "https://doi.org/10.1016/j.joca.2012.06.010" @default.
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