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- W2158532922 abstract "Many epidemiological studies show that genistein intake is effective for maintaining bone mineral density (BMD). Because the reason for the efficacy of genistein as a bone protective agent in vivo remains unclear, we investigated the mechanisms underlying the effects of genistein on BMD in relation to BMP-Smad signaling systems. When osteoblastic MC3T3-E1 cells were exposed to 1 µM genistein, they increased in number. Combined administrations of 1 µM genistein and 1 µM of ICI 182,780 inhibited the increase in cell numbers. Alkaline phosphatase (ALP) and Alizarin red staining showed high activities, indicating that genistein might promote estrogenic differentiation of MC3T3-E1 cells. Moreover, ELISA determined that production of osteoprotegerin (OPG), which is expressed by osteoblasts, was higher when 1 µM genistein was added to the medium than in controls. In contrast, when 10 ng/mL of noggin was administered in the medium, OPG production was inhibited. In order to clarify the underlying mechanism, we investigated the BMP-Smad signaling pathway. When genistein was added to the medium, it induced gene expression of BMP-4. Immunofluorescence staining showed that genistein induced phosphorylation of Smad 1/5, a downstream molecule of BMP. When noggin, which binds to BMP and blocks BMP signaling, was added to the medium, phosphorylation of Smad 1/5 was reduced. These results indicate that genistein may regulate bone metabolism through the BMP-Smad signaling pathway as well as through the estrogen receptor pathway." @default.
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- W2158532922 date "2013-01-01" @default.
- W2158532922 modified "2023-09-28" @default.
- W2158532922 title "Genistein affects osteoblastic MC3T3-E1 cells both through estrogen receptor and BMP-Smad signaling pathways" @default.
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