Foxp3遺伝子の保存された非コーディングDNA要素が,T細胞の運命を調節する上で果たす役割
Ye Zheng1, Steven Josefowicz, Ashutosh Chaudhry
1Howard Hughes Medical Institute and Department of Immunology, University of Washington, Seattle, Washington 98195, USA.
Nature
|January 15, 2010
まとめ
調節性T (Treg) 細胞集団は,Foxp3ロカスで保存された非コーディングDNA要素 (CNS) によって制御されます. これらの中枢神経系要素は,Treg細胞のサイズ,組成,および安定性を決定し,免疫ホメオスタシスを確保します.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 免疫ホメオスタシスは,免疫応答を制御するために,調節性T (Treg) 細胞に依存しています.
- Treg細胞は,チムス (tTreg) または周辺 (iTreg) のいずれかで,血統結合のための転写因子Foxp3を上位調節する.
- Foxp3の位置にある保存された非コーディング配列 (CNS) は,Treg細胞の集団動態を調節すると仮定されている.
研究 の 目的:
- マウスのTreg細胞運命を決定する際に,Foxp3の3つのCNS要素 (CNS1-3) の機能を調査する.
- これらの中枢神経系要素がTreg細胞の集団のサイズ,構成,安定性をどのように制御しているのかを理解する.
主な方法:
- 中枢神経系要素とのタンパク質相互作用を特定するためのインビトロ結合測定法.
- 標的型の中枢神経系改変によるマウスモデルにおけるTreg細胞の分化と機能の分析.
- 中枢神経系の機能におけるDNA脱メチル化と転写因子結合の役割を調査する.
主要な成果:
- CNS3は先駆的要素として作用し,胸腺と周辺の両方でTreg細胞の頻度を大幅に増加させ,c-Rel.を結合させます.
- TGF-β-NFAT応答要素を含むCNS1は,腸関連リンパ性組織におけるiTreg細胞生成に不可欠であるが,tTregの分化には欠かせない.
- CNS2は,分裂するTreg細胞の子孫におけるFoxp3発現を維持するために不可欠であり,Foxp3の結合は脱メチル化に依存しており,系統の安定性における役割を示唆しています.
結論:
- Foxp3 CNSの要素は,特定のシグナルの反応として,Treg細胞の生成と維持を差異的に調節します.
- CNS3はTreg細胞の生成を促進し,CNS1は外周Treg誘導の鍵であり,CNS2は遺伝性表遺伝子記憶を通じて系統の安定性を確保する.
- これらの発見は,免疫ホメオスタシスのTreg細胞集団動態を制御するFoxp3ロカスにおける複雑な規制ネットワークを明らかにしています.
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