胆酸の合成は,肝がん中に腫瘍特異のT細胞反応を阻害する
Siva Karthik Varanasi1, Dan Chen1, Yingluo Liu2
1NOMIS Center for Immunobiology and Microbial Pathogenesis, Salk Institute for Biological Studies, La Jolla, CA, USA.
Science (New York, N.Y.)
|January 9, 2025
まとめ
肝がんにおける胆酸 (BA) 合成の変化により,T細胞の免疫性と免疫療法への反応が強化される. ウルソデオキシコール酸のような BAを調節する薬は 癌治療の改善に有望です
科学分野:
- ヘパトロジー
- 免疫学
- 癌 代謝
背景:
- 腫瘍の微小環境の代謝状態は 癌の免疫に影響します
- 肝がんの免疫監視における胆酸 (BAs) などの器官特異的代謝物の役割は完全に理解されていません.
研究 の 目的:
- 肝細胞がん (HCC) と抗腫瘍免疫に対する胆酸の影響を調査する.
- 肝がんの免疫療法における胆酸合成または摂取を調節する治療の可能性を調査する.
主な方法:
- ヒトと実験的な肝がんモデルにおける胆酸蓄積の分析
- 結合BA合成を阻害する胆酸-CoA:アミノ酸N-アシルトランスフェラーゼ (BAAT) の遺伝的消去.
- T細胞の反応,腫瘍の成長,および抗プログラム細胞死タンパク質1 (抗PD-1) 治療に対する反応の評価.
- CD8+ T細胞機能に対する個々の胆酸の効果の評価
主要な成果:
- 肝臓がんの特徴は,一次結合酸と二次結合酸の蓄積です.
- BAATの消去を介してBA合成を阻害すると,腫瘍特異のT細胞反応が強化され,腫瘍の成長が減少しました.
- 阻害されたBA合成の腫瘍は,抗PD-1免疫療法に対する感受性の増加を示した.
- 異なるBAはT細胞を差異的に調節した. 主要なBAは酸化ストレスを誘発し,リトコリック酸はERストレスを介してT細胞機能を低下させ,この効果はウルソデオキシコリック酸によって相殺された.
結論:
- 胆汁酸代謝は肝がんの免疫微環境に大きな影響を与える.
- 特にウルソデオキシコール酸による胆酸合成または食事摂取を調節することで,抗腫瘍免疫を高め,肝がんにおける免疫療法の結果を改善することができます.
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