Anna van der Windt - Binnenwerk - CP v7 PDF.indd
نویسندگان
چکیده
In-vitro chondrocyte expansion is required for several cell-based approaches for the repair of chondral lesions. During expansion, loss of chondrogenic phenotype takes place (dedifferentiation). The objective of this study was to investigate calcineurin as a potential target to improve chondrocyte phenotype for cartilage repair purposes. Calcineurin activity in human articular chondrocytes was significantly increased during dedifferentiation and decreased during redifferentiation in vitro. Inhibition of calcineurin activity by FK506 increased the expression of chondrogenic markers collagen type 2, aggrecan and SOX9 in culture expanded cells. Addition of FK506 increased endogenous Transforming Growth Factor (TGF) β1 expression on both mRNA and protein level. The effect of FK506 on chondrogenic markers was abolished by addition of anti-TGFβ1 antibody, indicating that the endogenous TGFβ1 was necessary to increase chondrogenic marker expression. We also showed that chondrocyte redifferentiation by TGFβ requires calcium influx and does not depend on changes in calcineurin activity. In conclusion, inhibition of calcineurin activity by FK506 increases the expression of chondrogenic markers via endogenous TGFβ1 production in human articular chondrocytes. Calcineurin inhibitors might be an alternative for the application of (recombinant) TGFβ, to promote chondrocyte phenotype for cell-based cartilage repair procedures. Calcineurin inhibitors induce chondrogenic marker expression 29
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