自己由来ペプチドによってCD8+T細胞の部分活性化
1Beirne B. Carter Center for Immunology Research, University of Virginia Health Sciences Center, Charlottesville 22908, USA.
Nature
|November 16, 1995
まとめ
メジャー・ヒストコンパティビリティ・コンプレックス (MHC) 分子によって提示されるペプチドの構造の変化は,パーフェリン経路とは無関係にCD8+T細胞におけるCD95-CD95L媒介殺戮を選択的に誘発することができる.
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.
- 細胞生物学 細胞生物学
背景:
- T細胞の活性化には,典型的には,メジャー・ヒストコンパティビリティ・コンプレックス (MHC) の分子による特定のペプチドのプレゼンテーションが必要です.
- 免疫性ペプチドの構造的変異は,部分活性化または対抗性を含むT細胞応答を調節することができます.
- CD8+T細胞は,パーフォリン依存の粒子のエクソサイトーシスとCD95-CD95Lの相互作用を利用して,標的細胞を溶解する.
研究 の 目的:
- 構造的に類似したペプチドによって刺激されたCD8+T細胞の差別殺戮メカニズムを調査する.
- パーフェリン経路とは独立してCD95-CD95L媒介による殺戮が誘発できるかどうかを判断する.
- T細胞細胞毒性に対するMHC結合溝内の軽微なペプチド構造変化の影響を調査する.
主な方法:
- インフルエンザヘマグルチニンに特異的なKd制限のCD8+T細胞のクローンを利用しました.
- 刺激されたT細胞は,ミエロマ腫瘍の免疫グロブリン重鎖変域ペプチド (IgVH) とその生殖線同位体の両方を用いる.
- 異なるペプチド刺激条件下で使用された殺戮経路 (パーフォリン依存対CD95-CD95L) を分析した.
主要な成果:
- 腫瘍のIgVHペプチドによって活性化されたCD8+T細胞は,パーフェリンとCD95-CD95L経路の両方を介して標的を殺しました.
- MHC結合槽の単一のアミノ酸によって異なる生殖線IgVHペプチドによって刺激されると,CD8+T細胞はCD95-CD95L経路を通してのみ標的を殺しました.
- これは,CD95-CD95L媒介による殺戮が,パーフォリン依存殺戮とは独立して選択的に活性化できることを示しています.
結論:
- MHC分子によって提示されるペプチド構造のわずかな変化は,CD8+ T細胞細胞毒性機構を明確に調節することができます.
- CD95-CD95L経路は,CD8+T細胞媒介の細胞毒性に対して,独特で選択的に誘発可能な経路を提供します.
- ペプチド結合によって影響されるMHC構成の変化は,CD8+T細胞が利用する特定の細胞毒性の経路を決定する上で重要な役割を果たします.
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