微分化した細胞の刺激によって活性化される潜在的強化剤
Renato Ostuni1, Viviana Piccolo, Iros Barozzi
1Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy. renato.ostuni@ieo.eu
Cell
|January 22, 2013
まとめ
この研究は,刺激時に活性化し,表遺伝的記憶を形成する潜在的強化剤を明らかにしています. これらの暴露された強化剤は持続し,環境要因に対する将来の反応を強化します.
科学分野:
- 細胞および分子生物学
- エピジェネティクス エピジェネティクス
- 免疫学 免疫学とは
背景:
- 末端分化細胞は,典型的には,系統特異の転写因子 (TFs) によって維持される固定された強化剤のセットを持っています.
- 刺激によって活性化されたTFは,通常,この確立された強化剤のレパートリー内に結合します.
研究 の 目的:
- "潜伏強化剤"と呼ばれる新種の強化剤を特定し,特徴づけること.
- 細胞刺激への反応として増強剤の動的調節と,表遺伝子記憶におけるその役割について調査する.
主な方法:
- 末端微分化マクロファージにおけるTF結合とヒストンの改変の全ゲノム分析.
- マクロファージの刺激と,増強剤の活性とTF結合の変化の評価.
- 再刺激後の強化剤の持続性と機能の分析.
主要な成果:
- 潜在増強剤は,TF結合と増強剤のマークが欠けているゲノム領域として,刺激されていない微分細胞で識別されます.
- マクロファージの刺激は,連続的なTF結合と,潜在的エンハンスターにおけるエンハンサーマークの獲得につながります.
- 刺激が止まった後も,暴露された強化剤のサブセットが持続し,再刺激時に強化された反応を媒介する.
- これは,シスレギュレーションのレパートリーの刺激特有の拡張を示唆しています.
結論:
- 潜伏増強剤は,細胞外刺激に反応する,シス調節的景観のダイナミックな構成要素を表しています.
- 暴露された増強剤の持続性は,表遺伝子学的記憶に貢献し,環境物質との将来の遭遇のために細胞をプリミングします.
- このメカニズムは,機能強化剤のレパートリーを拡張し,細胞の反応力を高めます.
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