Comparative effects of raloxifene, tamoxifen and estradiol on human osteoblasts in vitro: Estrogen receptor dependent or independent pathways of raloxifene

Yasuhiro Miki, Takashi Suzuki, Shuji Nagasaki, Shuko Hata, Jun ichi Akahira, Hironobu Sasano

研究成果: Article査読

25 被引用数 (Scopus)

抄録

SERMs bind to both estrogen receptor (ER)α and β, resulting in tissue dependent estrogen agonist or antagonist responses. Both raloxifene and tamoxifen are most frequently used SERMs and exert estrogen agonistic effects on human bone tissues, but the details of their possible direct effects on human bone cells have remained largely unknown. In our present study, we examined the comparative effects of raloxifene, tamoxifen, and native estrogen, estradiol on human osteoblast cell line, hFOB in vitro. Both the cell numbers and the ratio of the cells in S phase fraction were significantly increased by the treatment of raloxifene or tamoxifen as well as estradiol treatments in hFOB. Gene profile patterns following treatment with raloxifene, tamoxifen, and estradiol demonstrated similar patterns in a microarray/hierarchal clustering analysis. We also examined the expression levels of these genes detected by this analysis using quantitative RT-PCR. MAF gene was induced by raloxifene treatment alone. GAS6 gene was induced by raloxifene and tamoxifen as well as estradiol. An estrogen receptor blocker, ICI 18, 286, inhibited an increase of GAS6 gene expression but not the levels of MAF gene mRNA expression. Results of our present study demonstrated that raloxifene exerted direct protective effects on human osteoblasts in both estrogen receptor dependent and independent manners.

本文言語English
ページ(範囲)281-289
ページ数9
ジャーナルJournal of Steroid Biochemistry and Molecular Biology
113
3-5
DOI
出版ステータスPublished - 2009 2

ASJC Scopus subject areas

  • 内分泌学、糖尿病および代謝内科学
  • 生化学
  • 分子医療
  • 分子生物学
  • 内分泌学
  • 臨床生化学
  • 細胞生物学

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