SETDB1によるエピジェネティック・サイレンシングは,腫瘍内在の免疫性を抑制する
Gabriel K Griffin1,2,3, Jingyi Wu1,2, Arvin Iracheta-Vellve1
1Broad Institute of MIT and Harvard, Cambridge, MA, USA.
Nature
|May 6, 2021
まとめ
この研究では,SETDB1が抗腫瘍免疫を抑制する重要な表遺伝子調節因子として特定されています. SETDB1の喪失は,免疫反応を活性化することによって,免疫療法に対するがん細胞の感受性を高めます.
科学分野:
- 癌 研究
- エピジェネティクス
- 免疫学
背景:
- エピジェネティック・ディスレグレーションは 癌の特徴で 免疫回避に寄与します
- 癌細胞の免疫感受性を制御する要因を特定することは,効果的な免疫療法を開発するために極めて重要です.
研究 の 目的:
- 癌細胞の免疫感受性を調節する表遺伝子調節体を特定する.
- SETDB1の免疫脱出と免疫チェックポイントの阻害に対する抵抗の役割を調査する.
主な方法:
- 免疫チェックポイントブロックで治療されたマウスの腫瘍モデルで in vivo CRISPR- Cas9 スクリーンを実施した.
- 免疫感受性に影響を与える要因を特定するために,936のクロマチン調節体を標的とした.
- 人間の腫瘍におけるSETDB1増幅とその免疫排除との関連を分析した.
主要な成果:
- SETDB1 (H3K9メチルトランスフェラーゼ) と関連する複合体 (HUSH,KAP1) を免疫脱出の媒介体として特定した.
- 人間の腫瘍におけるSETDB1増幅は,免疫排除と免疫チェックポイント阻害に対する抵抗と相関しています.
- SETDB1の喪失は,移植可能な要素と免疫刺激遺伝子を抑制し,T細胞の反応を誘発する.
結論:
- SETDB1は,腫瘍内在の免疫性を抑制するエピジェネティック・チェックポイントとして作用する.
- SETDB1は,がん免疫療法の成果を向上させるための潜在的な治療標的である.
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