Study on the Role of Estrogen Receptor-Alpha in Yak-Kong and Soybean Induced Proliferation of MG-63 Human Osteoblastie Cells

약콩 (Rhynchosia volubilis: 서목태) 및 대두 처리에 의한 MG-63 조골세포 증식 증가에서 ER$\alpha$의 역할에 대한 연구

  • Um, So-Jung (Department of Medical Nutrition, Graduate School of East-West Medical Science) ;
  • Kang, In-Sook (Department of Biochemistry and Molecular Biology, School of Medicine, Kyung Hee University) ;
  • Cho, Yun-Hi (Department of Medical Nutrition, Graduate School of East-West Medical Science)
  • 엄소정 (경희대학교 동서의학대학원 의학영양학과) ;
  • 강인숙 (경희대학교 의과대학 생화학교실) ;
  • 조윤희 (경희대학교 동서의학대학원 의학영양학과)
  • Published : 2005.09.01

Abstract

Phytoestrogens, especially Yak-kong or soybean-derived isoflavones have been traditionally used as a supplement of estrogen for preventing postmenopausal osteoporosis in oriental folk medicine. In a previous study, we demonstrated that as Yak-kong and soybean increased MG-63 human osteoblastic cell proliferation, the expression of estrogen receptor $\alpha\;and\;beta\;(ER\;\alpha:\;ER\;\beta$) both were increased. However, the increased level of ER $\alpha$ is much higher than that of ER$\beta$. To determine whether the altered level of ER $\alpha$ expression affects Yak-kong or soybean induced MG-63 cell proliferation, we established cell lines stably expressing either ER $\alpha$ or antisense ER $\alpha$ RNAs. Increased expression of ER a in MG- 63 cells (ER $\alpha$-MG63) enhanced Yak-kong or soybean induced proliferation which paralleled with the enhanced expression of IGF-I. Inhibition of ER $\alpha$ expression by antisense $ER\;\alpha\;RNAs\;(As-ER\;\alpha-MG63$) caused these cells to insensitize Yak- kong or soybean induced proliferation and IGF-I expression. Furthermore, the comparable effects between Yak-kong and the combined treatment of genistein and daidzein at $0.5\;{\times}\;10^{-8}M$, which is a concentration of these two isoflavones similar to Yak-kong at 0.001 mg/ml, on cell proliferation and IGF-I expression in $ER\;\alpha-MG63\;or\;As-ER\;\alpha-MG63$ cells demonstrate that ER $\alpha$ plays an important, active role in MG-63 cell proliferation induced by phytoestrogens, especially Yak-kong or soybean derived isoflavones.

Keywords

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