ビタミンD受容体/SMAD遺伝子回路ゲートは,肝臓の線維症反応を誘導する
Ning Ding1, Ruth T Yu, Nanthakumar Subramaniam
1Gene Expression Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
Cell
|April 30, 2013
まとめ
ビタミンD受容体 (VDR) リガンドは,肝臓のステラ細胞の活性化を阻害することによって,肝臓線維症を抑制します. VDRは肝臓の創傷治癒を調節する上で重要な役割を果たし,肝臓線維症の新たな治療法を提供することができる.
科学分野:
- 肝臓病理学 肝臓病理学
- 分子生物学は分子生物学である.
- エンドクリノロジー エンドクリノロジー
背景:
- 肝繊維症は,過剰な細胞外マトリックス堆積によって特徴づけられる病理的な創傷治癒反応です.
- TGFβ1/SMADシグナル伝達によって誘発される肝臓のステラ細胞 (HSC) の活性化は,肝臓線維症の中心にある.
- 肝臓の線維生成におけるビタミンD受容体 (VDR) の役割は完全に理解されていません.
研究 の 目的:
- HSCの活性化と肝繊維症におけるVDRの役割を調査する.
- VDRがHSCにおけるTGFβ1/SMAD信号伝達に影響を与える分子メカニズムを解明する.
- 肝繊維症の治療におけるVDRリガンドの治療の可能性を調査する.
主な方法:
- TGFβ1およびVDRリガンドで治療されたHSCを用いたインビトロ研究.
- Vdrノックアウトマウスと野生型のマウスを用いたin vivo研究.
- 染色体免疫プレシピテーションシーケンシング (ChIP-seq) により,VDRとSMAD3の結合部位をマッピングする.
- プロフィブロティックマーカーを評価するための遺伝子発現分析.
主要な成果:
- VDRリガンドは,TGFβ1誘発のHSC活性化と消去された肝繊維症を阻害した.
- Vdrノックアウトマウスは,自発的な肝繊維症を示した.
- TGFβ1シグナル伝達により,VDRゲノム全体の結合部位が変化し,VDRがプロフィブロティック遺伝子との相互作用を促進した.
- VDRリガンド治療は,これらの標的遺伝子のSMAD3占有率を低下させ,それによって線維症を抑制しました.
結論:
- VDRは,肝臓の創傷治癒反応を調節する内分泌チェックポイントとして機能します.
- 交差するVDR/SMADゲノム回路が肝臓線維生成を調節する.
- VDRリガンドは,肝繊維症に対する有望な治療戦略です.
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