BET阻害剤に対する耐性は,白血病幹細胞から発生する
Chun Yew Fong1,2,3, Omer Gilan1,2, Enid Y N Lam1
1Cancer Research Division, Peter MacCallum Cancer Centre, East Melbourne, Victoria 3002, Australia.
Nature
|September 15, 2015
まとめ
ブロモドメインとエクストラ・ターミナル・プロテイン (BET) 阻害剤は急性骨髄性白血病の治療に有望である. レジスタンスは白血病の幹細胞から発生し,部分的にはWnt/β-カテニンのシグナル伝達が増加したため,薬剤の感受性を回復させることが可能である.
科学分野:
- 腫瘍学
- 分子生物学
- 薬理学について
背景:
- ブロモドメインおよび追加の末端タンパク質 (BET) 阻害剤は,がんに対する新しい標的療法です.
- 臨床試験では,特に急性骨髄性白血病 (AML) の治療において,BET阻害剤は有望であることが示されています.
- BET阻害剤の有効性を最適化するには,抵抗メカニズムを理解することが重要です.
研究 の 目的:
- BET阻害剤I-BETに対するレジスタンスメカニズムをマウスの血液形成幹細胞および前身細胞で調査する.
- 白血病におけるBET阻害剤耐性を克服するための戦略を特定する.
主な方法:
- MLL-AF9で不死化したマウスの血球形成幹細胞および祖先細胞からI-BET耐性単細胞クローンを生成した.
- 他のBET阻害剤に対するクロスレジスタンスと遺伝的ノックダウンを評価した.
- 分析されたクロマチン結合BRD4レベルと主要な遺伝子発現 (例えば,Myc).
- 耐性におけるWnt/β-カテニンのシグナル伝達の役割を調査した.
主要な成果:
- I-BET抵抗は,他のBET阻害剤と遺伝的ノックダウンに交差抵抗を与える.
- 抗体は白血病の幹細胞から発生し,薬物の流出や代謝によるものではありません.
- 染色素に結合したBRD4の全体的な減少が観察され,Myc発現は変化しなかった.
- マウスとヒトの白血病細胞における抵抗の重要なメカニズムとして,Wnt/β-カテニンのシグナル伝達の増加が特定されました.
結論:
- AMLにおけるBET阻害剤に対する耐性は,部分的に強化されたWnt/β-カテニンのシグナル伝達によって媒介される.
- Wnt/β-cateninシグナリングをターゲットにすることで,BET阻害剤に対する感受性を回復させることができます.
- これらの発見はAMLの生物学に関する洞察を提供し,BET阻害剤治療を改善するための戦略を示唆しています.
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