溶解性タンパク質を抗原加工およびプレゼンテーションのクラスI経路に導入する
M W Moore1, F R Carbone, M J Bevan
1Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.
Cell
|September 9, 1988
まとめ
細胞毒性Tリンパ球 (CTL) 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) のクラスI分子によって提示されるペプチドを認識する. オバルブミン (OVA) を細胞細胞質に直接注入すると,細胞外ではなく,CTL溶解に細胞を敏感にし,細胞内ペプチド処理経路を明らかにします.
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.
- 細胞生物学 細胞生物学
背景:
- クラスIメジャー・ヒストコンパティビリティ・コンプレックス (MHC) のグリコプロテインは,細胞内ペプチドを細胞毒性Tリンパ球 (CTL) に提供する.
- MHCクラスIのペプチド結合の細胞内メカニズムを理解することは,適応免疫とワクチン開発において極めて重要です.
研究 の 目的:
- ペプチドがクラスIのMHC分子と結合する細胞内経路を調査する.
- 抗原の処理とプレゼンテーションがCTL認識にどのように影響するかを決定する.
主な方法:
- C57BL/6マウスにおけるOVA258-276ペプチドに特有のH-2Kb制限CTLの生成.
- 合成OVAペプチド,CNBr断片,およびネイティブOVAを用いたin vitroアッセイでは,CTL媒介溶解に対する標的細胞を感知させる.
- 皮ノソームのオスモティック溶解によるOVAの細胞内伝達.
主要な成果:
- 合成OVAペプチド (258-276) とOVA断片 (242-285,242-273) は,特定のCTLによってH-2b細胞を溶解に敏感にしました.
- 24時間までのネイティブOVAのインキュベーションは,認識のための細胞を感知させなかった.
- OVAの直接的な細胞質伝達により,H-2Kb制限の決定因子が形成され,細胞が溶解に敏感になりました.
結論:
- 細胞内処理と抗原のプレゼンテーションは,CTLによって認識されるMHCクラスIペプチド複合体の形成に不可欠です.
- 抗原の侵入経路は,MHCクラスI分子におけるその処理およびその後のプレゼンテーションに大きな影響を与えます.
- サイトプラズマ的配送は細胞外処理障壁を回避し,OVA258-276エピトープの効率的なプレゼンテーションを可能にします.
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