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エンドプラズマ網膜のストレスは,CREBHの分裂を活性化し,全身の炎症反応を誘発する
Kezhong Zhang1, Xiaohua Shen, Jun Wu
1Department of Biological Chemistry, University of Michigan Medical Center, Ann Arbor, MI 48109, USA.
Cell
|February 14, 2006
まとめ
肝臓特異的な転写因子であるCREBHは,エンドプラズマ網膜 (ER) ストレス中に割れていきます. この分裂は急性相応答 (APR) 遺伝子を活性化し,ERのストレスと炎症を結びつける.
科学分野:
- 分子生物学は分子生物学である.
- 細胞のストレス反応は,
- 免疫学 免疫学とは
背景:
- 調節された内膜タンパク質分解 (RIP) は,エンドプラズマ網膜 (ER) の膜に固定された転写因子を制御し,ステロールホメオスタシスと展開タンパク質応答 (UPR) に影響を与えます.
- ERのストレス誘発性炎症性遺伝子発現を媒介する特定の転写因子の役割は,まだ完全に理解されていません.
研究 の 目的:
- 急性相応答 (APR) に関与する新しいER局所化された転写因子を特定し,特徴づけること.
- ERストレスがAPR遺伝子の転写を活性化するメカニズムを解明する.
主な方法:
- CREBHをRIPで規制された肝臓特異的転写因子として特定する.
- ERのストレスに対するサイト-1およびサイト-2プロテアゼによるCREBH分裂の分析.
- 血清アミロイドP成分 (SAP) とC反応性タンパク質 (CRP) の遺伝子発現活性化におけるCREBHの役割の調査.
主要な成果:
- プロ炎症性サイトカインは,ER膜に固定されたCREBHの発現を増加させます.
- ERのストレスはCREBHの分裂を誘発し,APR遺伝子 (SAP,CRP) を活性化する核断片を解放します.
- イン・ビボ研究では,リポポリサッカリドと炎症誘発性サイトカインがUPRを活性化し,肝臓におけるCREBH分裂を誘発することを示しています.
結論:
- ER局所化された転写因子CREBHの活性化のための分子メカニズムが描写されています.
- ERのストレスは,CREBHの活性化とその後のAPR遺伝子発現を通じて,急性炎症反応を開始します.
- この研究は,ERストレスと炎症プロセスの開始との間に前例のない関連性を明らかにしています.
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