IL-21とTGF-βは,ヒトのT(H) 17細胞の分化のために必要である
Li Yang1, David E Anderson, Clare Baecher-Allan
1Division of Molecular Immunology, Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
Nature
|May 13, 2008
まとめ
成長因子-β (TGF-β) とIL-21の変換により,先天的なヒトのCD4 ((+)) T細胞がT ((H)) 17細胞に特異的に分化されます. これらの発見は,ヒトの自己免疫疾患におけるT(H) 17細胞の理解を進めている.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
背景:
- インターレウキン-17 (IL-17) を分泌するTヘルパー17 (T(H) 17細胞と調節性T細胞 (T(H) は,免疫反応において極めて重要です.
- T(H) 17細胞は,多発性硬化症やリウマチ性関節炎などの自己免疫疾患に関与しています.
- マウスT (H) 17細胞の分化がTGF-βとIL-6,またはTGF-βとIL-21によって誘発され,IL-23がフェノタイプを安定させる.
研究 の 目的:
- 人間の素朴なCD4 (((+)) T細胞がT (((H)) 17細胞に分化することを誘発する要因を解明する.
- マウスモデルからヒトのT (H) 17細胞生成を区別するために.
- 人間のT (H) 17細胞発達の鍵となるサイトカインを特定する.
主な方法:
- T細胞の分化における様々なサイトカイン (IL-1β,IL-6,TGF-β,IL-21) の役割を研究した.
- 人間の外周血液からのナイブおよび中央記憶CD4 (((+) T細胞集団を活用した.
- 評価されたIL-17A分泌とRORC2転写因子発現.
主要な成果:
- IL-1βとIL-6は,ヒトの中央記憶CD4 (((+)) T細胞からIL-17Aの分泌を誘導した.
- TGF-βとIL-21は,ヒトのナイブCD4 ((+)) T細胞のT ((H)) 17細胞への分化を特異的に促進しました.
- この分化には,転写因子RORC2.2の発現が伴いました.
結論:
- TGF-βとIL-21は,ヒトのナイブCD4 ((+)) T細胞をT ((H)) 17細胞に分化するための重要な要因です.
- これらの発見は,ヒトとマウスのT(H) 17細胞分化経路の違いを強調しています.
- 特定されたT(H) 17細胞群は,ヒトの炎症性疾患の研究に新たな道を開く.
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