Abstract
Objectives
Emdogain, containing an extract of fetal porcine enamel matrix proteins, is a potent stimulator of in vitro osteoclastogenesis. The underlying molecular mechanisms are, however, unclear.
Material and methods
Here, we have addressed the role of transforming growth factor-beta receptor type 1 (TGF-βRI) kinase activity on osteoclastogenesis in murine bone marrow cultures.
Results
Inhibition of TGF-βRI kinase activity with SB431542 abolished the effect of Emdogain on osteoclastogenesis induced by receptor activator of nuclear factor kappa-B ligand or tumor necrosis factor-alpha. SB431542 also suppressed the Emdogain-mediated increase of OSCAR, a co-stimulatory protein, and dendritic cell-specific transmembrane protein and Atp6v0d2, the latter two being involved in cell fusion. Similar to transforming growth factor-beta1 (TGF-β), Emdogain could not compensate for the inhibition of IL-4 and IFNγ on osteoclast formation. When using the murine macrophage cell line RAW246.7, SB431542 and the smad-3 inhibitor SIS3 blocked Emdogain-stimulated expression of the transcription factor NFATc1.
Conclusions
Taken together, the data suggest that TGF-βRI kinase activity is necessary to mediate in vitro effects of Emdogain on osteoclastogenesis.
Clinical relevance
Based on these in vitro data, we can speculate that at least part of the clinical effects of Emdogain on osteoclastogenesis is mediated via TGF-β signaling.
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Acknowledgments
We thank Catherine Solioz for her skillful technique assistance. This work was supported in part by the Straumann Institute.
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The authors declare to have no conflict of interest related to this study.
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Gruber, R., Roos, G., Caballé-Serrano, J. et al. TGF-βRI kinase activity mediates Emdogain-stimulated in vitro osteoclastogenesis. Clin Oral Invest 18, 1639–1646 (2014). https://doi.org/10.1007/s00784-013-1129-6
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DOI: https://doi.org/10.1007/s00784-013-1129-6