Abstract
It has been shown that cell cycle genes play an important role in the coordination of chondrocyte proliferation and differentiation. The inhibitory effects of glucocorticoids (GCs) on chondrocyte proliferation are consistent with GCs disrupting cell cycle progression and promoting cell cycle exit. Cyclin-dependent kinase inhibitors (CDKIs) force cells to exit the cell cycle and differentiate, and studies have shown that expression of the CDKI p21CIP1/WAF1 is increased in terminally differentiated cells. In this study, p21 mRNA and protein expression was increased during chondrocyte differentiation and after exposure to dexamethasone (Dex, 10−6 M) in murine chondrogenic ATDC5 cells. In 4-week-old mice lacking a functional p21 gene, Dex caused a reduction in body weight compared to saline control null mice, but this was consistent with the reduction in body weight observed in Dex-treated wild-type littermates. In addition, p21 ablation had no effect on the reduction in width of the growth plate or reduced mineral apposition rate in Dex-treated mice. However, an alteration in growth rate and epiphyseal structure is evident when comparing p21−/− and wild-type mice. These findings suggest that p21 does not directly contribute to GC-induced growth retardation in vivo but is involved in the maintenance of the growth plate.
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Acknowledgements
We thank Drs. Bruce Whitelaw and Douglas Vasey (Roslin Institute) for providing p21−/− mice and the Small Animal Unit at the Roslin Institute for assistance with in vivo experiments. We also thank Dr. Scott Roberts (Katholieke Universiteit Leuven) for assistance with manuscript preparation and Ms. Elaine Seawright and Mr. Matt Prideaux (Roslin Institute) for technical assistance with tissue processing. This projected was funded by the Biotechnology and Biological Sciences Research Council (BBSRC) UK through a studentship award (to H. C. O.) and Institute Strategic Programme Grant funding from the BBSRC.
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Owen, H.C., Ahmed, S.F. & Farquharson, C. Chondrocyte p21WAF1/CIP1 Expression Is Increased by Dexamethasone but Does Not Contribute to Dexamethasone-Induced Growth Retardation In Vivo. Calcif Tissue Int 85, 326–334 (2009). https://doi.org/10.1007/s00223-009-9276-0
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DOI: https://doi.org/10.1007/s00223-009-9276-0