Resveratrol Promotes in vitro Differentiation of Osteoblastic MC3T3-E1 Cells via Potentiation of the Calcineurin/NFATc1 Signaling Pathway
- 1 Downloads
Resveratrol has been shown to stimulate differentiation of osteoblastic MC3T3-E1 cells in vitro; however, the mechanisms underlying the anabolic effect of resveratrol on osteoblasts remain largely unknown. Our study was aimed to investigate the molecular mechanism of resveratrol-induced differentiation of MC3T3-E1 cells. MC3T3-E1 cells were treated for 8 days with different concentrations of resveratrol (10−8-10−6 M) and 10−6 M cyclosporine A (CsA), a specific inhibitor of the calcineurin/NFAT pathway. According to the results of pilot studies of cell proliferation and alkaline phos-phatase activity, 10−7 M concentration of resveratrol was used in subsequent experiments. The levels of mRNA expression of the osteosis-related genes CaN, NFATc1, and Runx2 were analyzed by real-time RT-PCR; the levels of the corresponding proteins were estimated by Western blot analysis. Resveratrol upregulated expression of the CaN, NFATc1, and Runx2 genes at both mRNA and protein levels compared to the control group (p < 0.05), while CsA reduced the effects of resveratrol (p < 0.05). Using immunohistochemical staining, we showed that resveratrol induced NFATc1 accumulation in the cell nuclei, and treatment with CsA inhibited resveratrol-mediated induction of NFATc1, suggesting that the calcineurin/NFATc1 signaling pathway plays an important role in the regulatory effect of resveratrol on osteoblasts.
Keywordsresveratrol cyclosporine A calcineurin/NFATc1 osteoblast differentiation
alpha minimum essential medium
nuclear factor of activated T cells, cytoplasmic 1
nuclear factor kappa B
Runt-related transcription factor 2
Unable to display preview. Download preview PDF.
The authors thank Professor Song for her concentrated guidance during this study.
- 9.Vimalraj, S., and Selvamurugan, N. (2013) MicroRNAs: synthesis, gene regulation and osteoblast differentiation, Curr. Issues Mol. Biol., 15, 7–18.Google Scholar
- 12.Song, L. H., Pan, W., Yu, Y. H., Quarles, L. D., Zhou, H. H., and Xiao, Z. S. (2006) Resveratrol prevents CsA inhibition of proliferation and osteoblastic differentiation of mouse bone marrow-derived mesenchymal stem cells through an ER/NO/cGMP pathway, Toxicol. In Vitro, 20, 915–922.CrossRefGoogle Scholar