期刊
JOURNAL OF CELLULAR BIOCHEMISTRY
卷 113, 期 10, 页码 3197-3206出版社
WILEY
DOI: 10.1002/jcb.24196
关键词
SILICATE; OSTEOBLASTS; OSTEOCLASTS; HYDROXYAPATITE FORMATION; OSTEOBLASTOGENESIS; OSTEOCLASTOGENESIS
资金
- ERC [268476]
- German Bundesministerium fur Bildung und Forschung
- Deutsche Forschungsgemeinschaft SCHR [277/10-2]
- European Commission [215507, 246987]
- Industry-Academia Partnerships and Pathways CoreShell [286059]
- International Human Frontier Science Program
- Public Welfare Project of Ministry of Land and Resources of the People's Republic of China [201011005-06]
- International S & T Cooperation Program of China [2008DFA00980]
It has been shown that inorganic monomeric and polymeric silica/silicate, in the presence of the biomineralization cocktail, increases the expression of osteoprotegerin (OPG) in osteogenic SaOS-2 sarcoma cells in vitro. In contrast, silicate does not affect the steady-state gene expression level of the osteoclastogenic ligand receptor activator of NF-kappa B ligand (RANKL). In turn it can be expected that the concentration ratio of the mediators OPG/RANKL increases in the presence of silicate. In addition, silicate enhances the growth potential of SaOS-2 cells in vitro, while it causes no effect on RAW 264.7 cells within a concentration range of 10-100 mu M. Applying a co-cultivation assay system, using SaOS-2 cells and RAW 264.7 cells, it is shown that in the presence of 10 mu M silicate the number of RAW 264.7 cells in general, and the number of TRAP(+) RAW 264.7 cells in particular markedly decreases. The SaOS-2 cells retain their capacity of differential gene expression of OPG and RANKL in favor of OPG after exposure to silicate. It is concluded that after exposure of the cells to silicate a factor(s) is released from SaOS-2 cells that causes a significant inhibition of osteoclastogenesis of RAW 264.7 cells. It is assumed that it is an increased secretion of the cytokine OPG that is primarily involved in the reduction of the osteoclastogenesis of the RAW 264.7 cells. It is proposed that silicate might have the potential to stimulate osteogenesis in vivo and perhaps to ameliorate osteoporotic disorders. J. Cell. Biochem. 113: 3197-3206, 2012. (c) 2012 Wiley Periodicals, Inc.
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