Abstract
Mg2+, Zn2+ and Sr2+ substitution for Ca2+ in plasma sprayed calcium silicate (Ca–Si) coatings have been reported to impede their degradation in physiological environment and, more importantly, to improve their biological performance. The reason for the improved biological performance is still elusive and, especially, the contribution of the dopant ions is lack of obvious and direct evidence. In this study, we aim to identify the effect of Mg2+, Zn2+ and Sr2+ incorporation on the osteogenic ability of Ca–Si based coatings (Ca2MgSi2O7, Ca2ZnSi2O7 and Sr-CaSiO3) by minimizing the influence of Ca and Si ions release and surface physical properties. Similar surface morphology, crystallinity and roughness were achieved for all samples by optimizing the spray parameters. As expected, Ca and Si ions release from all the coatings showed the comparable concentration with immersing time. The response of MC3T3-E1 cells onto Mg2+, Zn2+ and Sr2+ doped Ca–Si coatings were studied in terms of osteoblastic adhesion, proliferation, differentiation and mineralization. The results showed that the level of cell adhesion and proliferation increased the most on the surface of Mg-modified coating. Gene expressions of early markers of osteoblast differentiation (COL-I and ALP mRNA) were obviously improved on Zn-modified coating. Gene expressions of later markers for osteoblast differentiation (OPN and OC mRNA) and mineralized nodules formation were obviously accelerated on the surface of Sr-modified coating. Since Mg2+, Zn2+ and Sr2+ play a regulatory role in different stages of osteogenesis, it may be possible to utilize this in the development of new coating materials for orthopedic application.
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Acknowledgments
This work was supported by the Natural Science Foundation of China (Grant No. 51172264, No. 51502328) and the Opening Project of the Shanghai Key Laboratory of Orthopedic Implant (Grant No. KFKT2014002).
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Hu, D., Li, K., Xie, Y. et al. Different response of osteoblastic cells to Mg2+, Zn2+ and Sr2+ doped calcium silicate coatings. J Mater Sci: Mater Med 27, 56 (2016). https://doi.org/10.1007/s10856-016-5672-y
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DOI: https://doi.org/10.1007/s10856-016-5672-y