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SUMOylationに依存する経路は,PPAR-gammaによって炎症反応遺伝子のトランスプレッションを媒介する
Gabriel Pascual1, Amy L Fong, Sumito Ogawa
1Department of Cellular and Molecular Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA.
Nature
|August 30, 2005
まとめ
ペロキシソーム増殖器活性化受容体-ガンマ (PPAR-ガンマ) アゴニストは,基因プロモーターを標的とするコアプレッサーを勧誘することによって,炎症性遺伝子を抑制する. このメカニズムは,PPAR-ガンマが活性化剤から抑制剤に変換され,免疫とホメオスタシスに影響を及ぼす方法を説明します.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 免疫学 免疫学とは
背景:
- ペロキシソーム増殖器活性化受容体-ガンマ (PPAR-ガンマ) は,アディポゲネシスとグルコースホメオスタシスに不可欠であり,インスリン感受性薬によって標的とされています.
- 核因子カッパB (NF-kappaB) トランスプレッションによるPPAR-ガンマアゴニストの抗炎症効果は,抗糖尿病および抗アテロゲン作用と関連しているが,メカニズム的には不明である.
研究 の 目的:
- マウスマクロファージにおける炎症性遺伝子転写をPPAR-gammaが抑制する分子経路を解明する.
- PPAR-ガンマ媒介遺伝子抑制に関与する初期ステップと主要な分子プレーヤーを特定する.
主な方法:
- PPAR-ガンマリンガンド結合ドメインのリガンド依存SUMOylationを調査した.
- 炎症性遺伝子プロモーターにおけるPPAR-ガンマの核受容体コアプレッサー (NCoR) - ヒストンデセチラゼ-3 (HDAC3) コンプレックスへのターゲティングを調査した.
- Ubiquitylation/19S プロテアソーム機構とコアプレッサー複合体の除去の採用への影響を評価した.
主要な成果:
- リンガンに結合したPPAR-gammaはSUMOylationを経て,炎症性遺伝子プロモーターのNCoR-HDAC3複合体を標的とする.
- このリクルートメントは,コアプレッサー複合体を除去する ubiquitylation/19S プロテアソーム機構を防ぐ.
- その結果,NCoR複合体は結合し,標的遺伝子を抑制状態に保ちます.
結論:
- 新しい経路は,アゴニストに結合したPPAR-gammaが,NF-kappaB標的遺伝子のプロモーター特異的抑制剤としてどのように作用するかを明らかにしています.
- このメカニズムは,PPAR-gammaの転写活性化剤から抑制剤への変換を説明します.
- この発見は,PPAR-gamma. による免疫とホメオスタシスの調節についての洞察を提供します.
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