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Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay
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[Effects of daidzein on steroid receptor coactivator-1 expression in MC3T3-E1 cells and the mechanism]

Li-fang Wang1, Jin-feng Wang, Wei-fang Jin

  • 1Department of Bone Metabolism, Institute of Radiation Medicine, Fudan University, Shanghai 200032, China.

Zhong Xi Yi Jie He Xue Bao = Journal of Chinese Integrative Medicine
|November 18, 2011
PubMed
Abstract

Insights

Daidzein boosts steroid receptor coactivator-1 (SRC-1) levels in bone cells, enhancing the SRC-1/nuclear receptor corepressor (NcoR) ratio. This suggests ERβ mediates daidzein's osteogenic effects.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Context:

  • Daidzein, a soy isoflavone, exhibits estrogenic activity.
  • Osteogenesis involves complex regulation of nuclear receptor coactivators and corepressors.
  • MC3T3-E1 cells are a standard model for studying osteoblast differentiation.

Purpose:

  • To investigate the effect of daidzein on the expression of steroid receptor coactivator-1 (SRC-1) and nuclear receptor corepressor (NcoR) in MC3T3-E1 osteoblastic cells.
  • To elucidate the role of estrogen receptors (ERs) in daidzein's action on SRC-1 and NcoR expression.

Summary:

  • Daidzein treatment significantly increased SRC-1 protein levels in MC3T3-E1 cells in a dose-dependent manner.
  • NcoR protein levels were not significantly altered by daidzein, leading to an increased SRC-1/NcoR ratio.
  • Blocking estrogen receptors with ICI182780 abolished daidzein's effect on SRC-1, while blocking ERα with MPP still allowed SRC-1 up-regulation, indicating ERβ involvement.

Impact:

  • Daidzein up-regulates SRC-1 and increases the SRC-1/NcoR ratio, contributing to its estrogenic effects in improving osteogenesis.
  • Estrogen receptor β (ERβ) plays a crucial role in mediating daidzein's effects on SRC-1 expression in osteoblasts.
  • Findings provide insights into the molecular mechanisms underlying the bone-protective effects of dietary isoflavones.

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