病原性エフェクターTH17とレギュレータ性T細胞の生成のための相互発達の経路
Estelle Bettelli1, Yijun Carrier, Wenda Gao
1Center for Neurologic Diseases, Beth Israel Hospital, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, Massachusetts 02115, USA.
Nature
|May 2, 2006
まとめ
インタールイウキン-6 (IL-6) は,病原性Tヘルパー17 (Th17) 細胞を促進しながら,調節性T細胞 (Treg) の発育を阻害する. このIL-6の活動は,その抑制よりも自己免疫組織損傷を好むバランスを生み出します.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- 自己免疫とは,自己免疫である.
背景:
- Tヘルパー (Th) 細胞は,病原体のクリアランスにおいて異なる役割を持つTh1およびTh2サブセットに微分化します.
- Th17細胞は自己免疫組織損傷を誘発し,調節性T細胞 (Treg) は自己免疫を抑制する.
- トランスフォーミング成長因子β (TGFβ) は,Treg細胞の生成に不可欠です.
研究 の 目的:
- T細胞の分化におけるインターリューキン-6 (IL-6) の役割を調査する.
- 病原性Th17細胞と調節性T細胞 (Treg) の生成に関与する要因を解明する.
主な方法:
- Foxp3ロカスにリポーターを持つマウスを利用して,Treg細胞の発達を追跡した.
- IL-6とTGF-βがナイブT細胞の分化に及ぼす影響を調査した.
- Th17細胞の分化におけるIL-23の役割を評価した.
主要な成果:
- IL-6は,Foxp3+ Treg細胞のTGF-β誘発生成を完全に抑制しました.
- IL-6とTGF-βは共に,病原性Th17細胞とナイブT細胞の分化を引き起こした.
- IL-23はTh17細胞の分化因子として特定されなかった.
結論:
- 自己免疫反応において,病原性Th17細胞とTreg細胞の間に重要なバランスが存在します.
- IL-6は,Tレグ細胞を阻害し,Th17細胞を促進することによって,T細胞の分化を自己免疫へと歪める上で重要な役割を果たします.
- これらの分化経路を理解することで,自己免疫組織損傷の制御に関する洞察が得られます.
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