腸内皮質細胞のミトファギーは,腫瘍形成中に適応免疫を誘発する
Paul K Ziegler1, Julia Bollrath2, Charles K Pallangyo2
1Institute for Tumor Biology and Experimental Therapy, Georg-Speyer-Haus, 60596 Frankfurt am, Germany; Institute of Pathology, Frankfurt University Hospital, 60590 Frankfurt, Germany.
Cell
|June 19, 2018
まとめ
細胞毒性の高いCD8+T細胞を持つ結腸直腸がんは,よりよい結果を示しています. 腸内皮質細胞はミトファジーとリソソーム損傷を利用して,腫瘍に対するT細胞の反応を高める.
科学分野:
- 腫瘍学
- 免疫学
- 細胞生物学
背景:
- 大腸がんの細胞毒性CD8+T細胞の高密度は,患者の予後改善と相関しています.
- 抗腫瘍免疫力を高めるメカニズムを理解することは 効果的ながん治療法の開発に不可欠です
研究 の 目的:
- 腸内皮質細胞 (IEC) の細胞内メカニズムを調査し,大腸がんにおけるCD8+ T細胞による適応免疫反応を調節する.
- 腸内腫瘍形成中のT細胞媒介免疫の制御におけるStat3シグナル伝達の役割を調査する.
主な方法:
- 腸内腫瘍形成の wnt/β-カテニン依存の原生モデルにおけるStat3機能喪失を活用した.
- IECにおけるMHCクラスIのプレゼンテーションに対するミトファジーとリソソームの整合性の影響を分析した.
- CD8+ T細胞の活性化のための dendritic 細胞を含むクロスドレスメカニズムを調査しました.
主要な成果:
- IECのミトファギーの上昇は,リソソームに鉄の蓄積をもたらし,リソソーム膜浸透 (LMP) を引き起こします.
- LMPはタンパク質を細胞質に放出し,MHCクラスIの表情を高めます.
- このプロセスは, dendritic 細胞のクロスドレッシングを通じて CD8+ T 細胞の活性化を促進し,抗腫瘍免疫に貢献します.
結論:
- ミトコンドリア機能 (ミトファジー),リソソーム完全性,およびIECにおけるMHCクラスIプレゼンテーションの間の新しいリンクを特定した.
- IECにおけるミトファジーまたはLMPを誘発する治療法は,大腸がんにおける抗腫瘍免疫力を強化する可能性がある.
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