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http://dx.doi.org/10.3746/jkfn.2010.39.1.064

Conditioned Medium of Soybean Extract Treated Osteoblasts Inhibits RANKL Induced Differentiation of Osteoclasts  

Park, Kyung-Ho (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University)
Ju, Won-Chul (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University)
Yeo, Joo-Hong (Dept. of Agricultural Biology, National Academy of Agricultural Science)
Lee, Kwang-Gill (Dept. of Agricultural Biology, National Academy of Agricultural Science)
Cho, Yun-Hi (Dept. of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.39, no.1, 2010 , pp. 64-70 More about this Journal
Abstract
Soybean is of particular interest as a food supplement of isoflavones for inhibiting bone resorption in postmenopausal woman. These beneficial effects of isoflavones are caused by functioning as partial agonists or antagonists of estrogen, of which anti-resorptive effect is mediated indirectly through paracrine factors produced by osteoblasts that act on osteoclasts. In this study, the indirect effect of soybean on osteoclastic differentiation of RAW264.7 cells were investigated. The conditioned medium was collected from MC3T3-E1 osbeoblasts treated with 0.001 mg/mL~0.1 mg/mL soybean extracts for 6 days, mixed in 1:1 ratio with osteoclast medium, and then added into RAW264.7 cells with receptor activator of nuclear factor kappa B ligand (RANKL), a differentiation inducer for 3 days. Of paracrine factors in the conditioned medium, the protein expression of osteoprotegerin (OPG) with soybean extract was specifically higher in a dose dependent manner than with $10^{-9}$ M~$10^{-6}$ M of estrogen, genistein or daidzein standards. In RAW264.7 cells, the conditioned medium with soybean inhibited RANKL induced osteoclastic differentiation as total number of multinucleated tartrateresistant alkaline phosphatase (TRAP)-positive osteoclasts and protein expression of MMP-9 were significantly decreased. Coupled with the low expression of estrogen receptor $\alpha$ and $\beta$ proteins in RANKL treated RAW264.7 cells, we demonstrate that the conditioned medium of soybean treated osteoblasts inhibits RANKL induced differentiation of osteoclasts with the selective expression of OPG in osteoblasts.
Keywords
soybean extract; conditioned medium of osteoblasts; RANKL; OPG; osteoclastic differentiation;
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