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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Transforming growth factor-beta stimulates cyclin D1 expression through activation of beta-catenin signaling in chondrocytes.

Transforming growth factor-beta (TGF-beta) plays an essential role in chondrocyte maturation. It stimulates chondrocyte proliferation but inhibits chondrocyte differentiation. In this study, we found that TGF-beta rapidly induced beta-catenin protein levels and signaling in murine neonatal sternal primary chondrocytes. TGF-beta-increased beta-catenin induction was reproduced by overexpression of SMAD3 and was absent in Smad3(-/-) chondrocytes treated with TGF-beta. SMAD3 inhibited beta-transducin repeat-containing protein- mediated degradation of beta-catenin and immunoprecipitated with beta-catenin following TGF-beta treatment. Both SMAD3 and beta-catenin co-localized to the nucleus after TGF-beta treatment. Although both TGF-beta and beta-catenin stimulated cyclin D(1) expression in chondrocytes, the effect of TGF-beta was inhibited with beta-catenin gene deletion or SMAD3 loss of function. These results demonstrate that TGF-beta stimulates cyclin D(1) expression at least in part through activation of beta-catenin signaling.[1]

References

  1. Transforming growth factor-beta stimulates cyclin D1 expression through activation of beta-catenin signaling in chondrocytes. Li, T.F., Chen, D., Wu, Q., Chen, M., Sheu, T.J., Schwarz, E.M., Drissi, H., Zuscik, M., O'Keefe, R.J. J. Biol. Chem. (2006) [Pubmed]
 
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