グルココルチコイドとプロゲステロンに特異的な効果は,それぞれのホルモン受容体の異なる発現によって決定されます
U Strähle1, M Boshart, G Klock
1Deutsches Krebsforschungszentrum, Institut für Zell- und Tumorbiologie, Heidelberg, FRG.
Nature
|June 22, 1989
まとめ
グルココルチコイド受容体やプロゲステロン受容体などのホルモン受容体は,同じDNA配列に結合します. プロゲステロン受容体を細胞に導入することで,遺伝子発現が再プログラムされ,異なる受容体発現が示され,ステロイド選択性が達成されます.
科学分野:
- 分子内分泌学分子内分泌学
- 遺伝学 遺伝学とは
- 細胞生物学 細胞生物学
背景:
- グルココルチコイドとプロゲスティンは,異なる生理学的プロセスを調節する.
- グルココルチコイドとプロゲスティンのホルモン受容体は,同一のDNA配列に結合する.
- これらのステロイドによる選択的遺伝子発現のメカニズムは不明である.
研究 の 目的:
- グルココルチコイドおよびプロゲステロン受容体が,同じDNA要素を結合しているにもかかわらず,選択的な遺伝子発現を達成する方法について調査する.
- 異なる受容体発現または他の要因への依存が選択性を誘発するかどうかを判断する.
主な方法:
- 合成遺伝子による移植実験とインビトロ結合研究を活用した.
- プロゲステロン受容体発現プラズミドを,内生的なプロゲステロン受容体を持たないが,グルココルチコイド受容体を有するラット肝腫細胞系 (Fto2B-3) に導入した.
- プロゲスチンによる内生性グルココルチコイド調節遺伝子の誘導性を評価した.
主要な成果:
- Fto2B-3細胞におけるプロゲステロン受容体の発現は,グルココルチコイド調節遺伝子のプロゲステン誘導を可能にしました.
- 単一の転写因子を導入することで,細胞の反応性を再プログラムすることが示された.
- ホルモン受容体の差異的発現がステロイド特異遺伝子活性化のための重要なメカニズムであることを証明した.
結論:
- 外部刺激に対する細胞の反応は,単一の転写因子を表現することによって再プログラムすることができます.
- ホルモン受容体の差異的発現は,ステロイド特異遺伝子の活性化を達成するための重要なメカニズムです.
- この研究は,異なるステロイドホルモンが,共有されたDNA結合部位を通じて遺伝子発現を選択的に調節する方法を明らかにしています.
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