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Updated: Feb 26, 2026

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Reduced PRC2 function causes asparaginase resistance in T-ALL by decreasing WNT pathway activity
Thomas Lefeivre1,2, Theodora-Ioana Grosu1,2, Cosmin Tudose1,2,3
1Systems Biology Ireland, University College Dublin, Dublin, Ireland.
Blood advances
|February 24, 2026
まとめ
Loss of Polycomb Repressive Complex 2 (PRC2) in T-cell acute lymphoblastic leukemia (T-ALL) reduces asparaginase sensitivity by altering WNT/STOP signaling. Proteasome inhibition may overcome this resistance.
科学分野:
- エピジェネティクス
- がん生物学
- 分子腫瘍学
背景:
- Polycomb Repressive Complex 2(PRC2)の機能喪失変異は、T細胞急性リンパ芽球性白血病(T-ALL)における治療反応不良と関連しています。
- PRC2の変化によるT-ALL治療耐性の根底にあるメカニズムは不明なままです。
研究 の 目的:
- T-ALLにおけるPRC2の変化がシグナル伝達経路にどのように影響するかを調査する。
- これらの経路変化が白血病治療への反応に影響を与えるかどうかを判断する。
主な方法:
- 異種T-ALL細胞モデルおよび一次患者データを利用しました。
- トランスクリプトーム、プロテオーム、ホスホプロテオーム解析を統合しました。
- 患者のトランスクリプトームプロファイルとの関連を分析しました。
主要な成果:
- PRC2欠損、特にEZH2の喪失は、WNT依存性タンパク質安定化(WNT/STOP)経路活性を著しく低下させました。
- PRC2の喪失は、T-ALLの主要な治療法であるアスパラギナーゼに対する感受性を著しく低下させました。
- この耐性は、WNT/STOP経路の抑制による細胞内ユビキチン化の増加と、アスパラギン貯蔵量の増加に関連していました。
- PRC2欠損T-ALLにおけるアスパラギナーゼ耐性は、患者データと相関しており、プロテアソーム阻害によって軽減される可能性がありました。
結論:
- PRC2の喪失は、WNT/STOP経路の抑制と細胞代謝の変化を通じて、T-ALLにおけるアスパラギナーゼ耐性を付与します。
- 薬理学的プロテアソーム阻害は、PRC2変異T-ALLにおけるアスパラギナーゼ耐性を克服するための潜在的な戦略となります。
- これらのメカニズムを理解することは、寛解導入治療の結果を改善するための潜在的な道筋を提供します。
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