共通のエストロゲン受容体多型化は,ホルモン置換療法の効果をEセレクチンに増加させるが,C反応性タンパク質には影響しない
David M Herrington1, Timothy D Howard, K Bridget Brosnihan
1Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC 27157-1045, USA. kklein@wfubmc.edu
Circulation
|May 9, 2002
まとめ
エストロゲン受容体アルファ (ER-alpha) IVS1-401 C/C遺伝子型は,ホルモン置換療法 (HRT) のEセレクチン減少を増加させるが,C反応性タンパク質 (CRP) は減少しない. このポリモルフィズムはB-mybの結合部位を作り,エストロゲンの作用に影響を与えます.
科学分野:
- エンドクリノロジー エンドクリノロジー
- 遺伝学 遺伝学とは
- 心血管の健康について
背景:
- エストロゲン受容体-アルファ (ER-alpha) IVS1-401のポリモルフィズムが,ホルモン置換療法 (HRT) の影響で,女性の約20%でHDLコレステロールの反応を示している.
- このポリモルフィズムが,EセレクチンとC反応性タンパク質 (CRP) に対するHRT効果に影響するかどうかを調査した.
研究 の 目的:
- ER-alpha IVS1-401のポリモルフィズムが,HRTによるEセレクチンとCRPの調節を増大させるかどうかを判断する.
- ポリモルフィズムとエストロゲンの作用を結びつけるメカニズムを探求する.
主な方法:
- HRTまたはプラセボにランダムに割り当てられた264人の閉経後の女性の血清EセレクチンとCRPの測定.
- HRTに対する遺伝子型特異的な反応を分析した.
- IVS1-401 T/CポリモルフィズムとB-myb相互作用の機能的影響を評価するために,ルシフェラーゼレポーター構造を用いた.
主要な成果:
- ER-alpha IVS1-401 C/C遺伝子型を持つ女性は,HRT (P=0.02) によるEセレクチンの減少が約2倍であった.
- C/Cと他の遺伝子型 (P=0.54) の間では,HRT誘発のCRP増加において有意な違いは観察されなかった.
- Cアレル構造はB-mybで10倍以上の発現強化を示したが,Tアレルでは2.5倍であった.
結論:
- ER-alpha IVS1-401 C/C遺伝子型は,より大きなHRT誘発のEセレクチン減少と関連しているが,CRP応答は変化していない.
- Cアレルは,機能的なB-myb結合部位を作り,分子メカニズムを示唆する.
- ER-alpha転写およびその他のアウトカムに関するこの多形態化の臨床的意義については,さらなる調査が必要である.
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