抗腫瘍免疫は,メラノーマにおける異常ペプチドのプレゼンテーションを誘導する
Osnat Bartok1, Abhijeet Pataskar2, Remco Nagel2
1Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel.
Nature
|December 17, 2020
まとめ
インターフェロン・ガンマ (IFNγ) はインドレアミン2,3- 二酸化酵素1 (IDO1) を誘導し,トリプトファンを枯渇させ,リボソームフレームシフトを引き起こします. メラノーマの免疫認識を 強化する可能性があります
科学分野:
- 免疫学
- 癌 生物学
- 分子生物学
背景:
- T細胞とインターフェロン・ガンマ (IFNγ) 信号による腫瘍の炎症は,よりよいメラノーマ免疫療法反応を予測する.
- 腫瘍はしばしばインドレアミン2,3-二酸化酵素1 (IDO1) 媒介のトリプトファン分解を含む免疫抑制経路を通じて免疫反応を回避する.
- IDO1の抑制は臨床試験で限られた成功を収めており,メラノーマにおけるその役割をより深く理解する必要があることを示しています.
研究 の 目的:
- メラノーマ細胞におけるmRNA翻訳に対する長期IFNγ治療の影響を調査する.
- IDO1がmRNA翻訳とがんの進行に影響を与えるメカニズムを解明する.
主な方法:
- リボソームプロファイリングは,IFNγ治療中のmRNA翻訳動態を分析するために使用されました.
- リボソームのフレームシフトとペプチド生成を評価するために,レポーターアッセイ,プロテオミック,および免疫ペプチドミック分析が行われました.
- 異常ペプチドの免疫原性を評価するために,T細胞プライミングアッセイを使用した.
主要な成果:
- IFNγ治療は,フレームシフトを示す"W-ブンプ"と呼ばれるトリプトファンのコドンのリボソームの蓄積につながった.
- IFNγ治療後に異常なトランスフレームペプチドが生成され,細胞表面に提示されました.
- これらの異常ペプチドはナイブT細胞を刺激し,ペプチド特異のT細胞反応を引き起こします.
結論:
- IFNγによって誘発されるIDO1媒介のトリプトファン減少は,メラノーマの免疫認識に寄与する.
- このプロセスはIFNγ誘発のリボソームフレームシフトによってメラノーマペプチドームの様子を多様化する.
- 発見はメラノーマの免疫回避と 潜在的な治療戦略に関する新しい洞察を 提供しています
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