A calcium-induced signaling cascade leading to osteogenic differentiation of human bone marrow-derived mesenchymal stromal cells

Cravo Barradas, A.M. and Fernandes, H.A.M. and Groen, N. and Chai, Y.C. and Schrooten, J. and Peppel van de, J. and Leeuwen van, J.P.T.M. and Blitterswijk van, C.A. and Boer de, J. (2012) A calcium-induced signaling cascade leading to osteogenic differentiation of human bone marrow-derived mesenchymal stromal cells. Biomaterials, 33 (11). 3205 - 3215. ISSN 0142-9612

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Abstract:	The response of osteoprogenitors to calcium (Ca2+) is of primary interest for both normal bone homeostasis and the clinical field of bone regeneration. The latter makes use of calcium phosphate-based bone void fillers to heal bone defects, but it is currently not known how Ca2+ released from these ceramic materials influences cells in situ. Here, we have created an in vitro environment with high extracellular Ca2+ concentration and investigated the response of human bone marrow-derived mesenchymal stromal cells (hMSCs) to it. Ca2+ enhanced proliferation and morphological changes in hMSCs. Moreover, the expression of osteogenic genes is highly increased. A 3-fold up-regulation of BMP-2 is observed after only 6 h and pharmaceutical interference with a number of proteins involved in Ca2+ sensing showed that not the calcium sensing receptor, but rather type L voltage-gated calcium channels are involved in mediating the signaling pathway between extracellular Ca2+ and BMP-2 expression. MEK1/2 activity is essential for the effect of Ca2+ and using microarray analysis, we have identified c-Fos as an early Ca2+ response gene. We have demonstrated that hMSC osteogenesis can be induced via extracellular Ca2+, a simple and economic way of priming hMSCs for bone tissue engineering applications.
Item Type:	Article
Copyright:	© 2012 Elsevier
Faculty:	Science and Technology (TNW)
Research Group:	Tissue Regeneration (TR)
Link to this item:	http://purl.utwente.nl/publications/80575
Official URL:	http://dx.doi.org/10.1016/j.biomaterials.2012.01.020
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