RAGリコンビネーゼは,自然殺人細胞の機能的異質性と細胞の適性を決定する
Jenny M Karo1, David G Schatz2, Joseph C Sun1
1Immunology Program and Gerstner Sloan Kettering Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
Cell
|September 27, 2014
まとめ
リコンビネーション活性化遺伝子 (RAG) は適応性免疫に不可欠ですが,予期せぬ形で先天性リンパ球に影響します. RAGは,自然キラー細胞および他の先天性細胞のDNA修復と生存を促進し,免疫的適性を確保します.
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:
- 再結合活性化遺伝子 (RAG) は,の脊椎動物の適応免疫に不可欠であり,抗原受容体遺伝子の多様性を可能にします.
- 生まれながらのリンパ球は,NK細胞のように,その機能のためにRAGを必要としないと考えられていた.
研究 の 目的:
- 生まれながらのリンパ球,特にNK細胞におけるRAGの役割を,V(D) J再結合における既知の機能を超えて調査する.
- RAGが,発達中のリンパ球におけるDNA損傷反応と修復メカニズムに影響を与えるかどうかを判断する.
主な方法:
- 発達の過程でRAG発現または内核酵素活性が欠けているNK細胞の分析.
- NK細胞の超反応性,増殖後の生存,DNA損傷応答媒介体発現,DNA破裂修復効率の評価.
- T細胞と先天性リンパ球細胞 (ILC) のRAG機能の検査.
主要な成果:
- RAGに欠けているNK細胞は,固有の超反応性を示したが,ウイルス誘発の増殖後に生存能力が低下した.
- これらのRAG欠乏性NK細胞は,DNA損傷応答媒介体発現の減少とDNA破裂修復の欠陥を示した.
- 同様のRAG依存機能がT細胞とILCで観察され,より広範な役割を果たしていることが示されました.
結論:
- RAGタンパク質は,先天性リンパ球における新しい機能を持ち,V(D) J再結合を超えて広がっています.
- RAG媒介のDNA分裂は,適応性リンパ球と先天性リンパ球の両方の細胞の健康と持続に寄与する.
- これは,RAGがストレスと急速な増殖の間にリンパ球の生存を保護する上で重要な役割を果たすことを示唆しています.
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