調節性T細胞の同一性を保護するFoxp3シス要素の機能
Xudong Li1, Yuqiong Liang1, Mathias LeBlanc1
1Nomis Foundation Laboratories for Immunobiology and Microbial Pathogenesis, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
Cell
|August 16, 2014
まとめ
特定のDNA要素である保存非コーディング配列2 (CNS2) は,T (Treg) 細胞の同一性を保護する. この表遺伝的メカニズムは,免疫ホメオスタシスを維持し,環境のシグナルを感知することで,自己免疫疾患を予防します.
科学分野:
- 免疫学 免疫学とは
- エピジェネティクス エピジェネティクス
- 細胞生物学 細胞生物学
背景:
- 多細胞生物は,ホメオスタシスの系統特異性を維持するために,末端微分細胞に依存しています.
- 免疫ホメオスタシスに不可欠な調節性T (Treg) 細胞は,転写因子Foxp3.3によって定義されます.
- 細胞のアイデンティティを,可塑性を与える環境的シグナルから保護するメカニズムは,依然として不明確です.
研究 の 目的:
- エピジェネティックメカニズムがTreg細胞のアイデンティティを環境信号から保護するかどうかを調査する.
- Treg細胞の安定性と機能を維持する保守非コーディング配列2 (CNS2) の役割を明らかにする.
主な方法:
- CNS2の分析,成熟したTregsでデメチル化されたCpGに富んだFoxp3内部シス元素である.
- 活性化されたTregsにおけるFoxp3プロモーターとのCNS2の相互作用を調査する.
- CNS2機能に対するTCR/NFAT活性化の影響を評価する.
主要な成果:
- CNS2は成熟したTregsで特異的にデメチル化され,免疫ホメオスタシスに役割を果たします.
- CNS2は,活性化されたTregsにおけるFoxp3発現を,サイトカイン条件の不安定化から保護する.
- CNS2はTCR/NFATの活性化を感知し,Foxp3プロモーターとの相互作用を促進します.
結論:
- CNS2のようなエピジェネティックにマークされたシスエレメントは,細胞のアイデンティティを保護することができます.
- CNS2は,分化と可塑性の両方にとって重要な環境のシグナルを感知することによって,Treg細胞のアイデンティティを保護します.
- このメカニズムは免疫ホメオスタシスを維持し,初期細胞の分化を妨げることなく,自己免疫疾患の発症を制限します.
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