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Noda-Seino, H.; Sawada, K.; Hayakawa, J.; Ohyagi-Hara, C.; Mabuchi, S.; Takahashi, K.; Nishio, Y.; Sakata, M.; Kurachi, H.; Kimura, T.
Journal of endocrinological investigation, 2013/1, Volume: 36, Issue: 1Journal Article
Background: Although G-protein-coupled receptor, GPR30, has been considered as a G-protein-coupled estrogen receptor, conflicting results have been reported and the function of GPR30 in bone remains unresolved. The aim of this study was to clarify the functional role of GPR30 in osteoblasts using its derived cell line. Methods and results: Immunohistochemical study revealed that GPR30 is expressed in human osteoblasts. Human fetal osteoblast cell lines, hFOB cells, which express GPR30 but lack estrogen receptor, were used for the in vitro experiments. Estradiol or raloxifene induced the proliferation of hFOB cells, which was accompanied by the activation of mitogen-activated protein (MAP) kinase. Those proliferative effects were completely abrogated by the transfection of GPR30 small interfering RNA, while the transfection alone did not affect the cell viability. Conclusion: GPR30 is required for the proliferation of hFOB cells induced by estradiol or raloxifene. This proliferative effect was at least partly mediated via MAP kinase activation. These findings revealed a novel function of GPR30 in osteoblasts and might lead to a better understanding of how estrogen and selective estrogen receptor modulators show their osteoprotective effects.
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