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TGF-β-FOXOシグナリングは,慢性骨髄性白血病の白血病の発症細胞を維持する
Kazuhito Naka1, Takayuki Hoshii, Teruyuki Muraguchi
1Division of Molecular Genetics, Center for Cancer and Stem Cell Research, Cancer Research Institute, Kanazawa University, Kanazawa, Ishikawa 920-0934, Japan. kazunaka@kenroku.kanazawa-u.ac.jp
Nature
|February 5, 2010
まとめ
Foxo3a欠乏症は慢性骨髄性白血病 (CML) の幹細胞活動を著しく低下させます. イマチニブと共にTGF-β-FOXO経路を標的にすることは,CMLの根絶のための新しい戦略を提供します.
科学分野:
- 血液学 ヘマトロジ
- 分子生物学は分子生物学である.
- がん研究 がん研究
背景:
- 慢性骨髄性白血病 (CML) の病原化には,BCR-ABLチロシンキナーゼが関与し,Aktシグナリングを活性化し,フォークヘッドO転写因子 (FOXO) を抑制します.
- イマチニブ療法は効果的ですが,CML白血病発症細胞 (LIC) を排除できず,疾患の再発につながります.
研究 の 目的:
- CML LIC の維持における Foxo3a の役割を調査する.
- CML LICにおけるAktの活性化とFoxo3aの局所化に対するTGF-β経路の影響を調査する.
- CML LIC 枯渇に対する併用療法を評価する.
主な方法:
- シンゲネック移植システムとCMLのような骨髄増殖性疾患のマウスモデルを使用した.
- LICにおけるFoxo3aの局所化とAktのリン酸化を評価した.
- Foxo3a欠乏症および野生型のCML LICsで連続移植実験を行った.
- ヒトCML LICsに対するTGF-β抑制の効果を in vitroで調査した.
主要な成果:
- Foxo3a欠乏症は,CML LICsの疾患を引き起こす能力を著しく低下させた.
- 核Foxo3aの局所化とAktのリン酸化低下はLICで濃縮された.
- TGF-βは,LICにおけるAktの活性化とFoxo3aの局所化の重要なレギュレータとして特定されました.
- TGF-β,Foxo3a欠乏症,イマチニブを併せて抑制することで,CMLをin vivoで効率的に減少させました.
- TGF-β抑制は,ヒトCML LICsのコロニー形成能力を低下させた.
結論:
- Foxo3aは,CML LICsの維持に重要な役割を果たしています.
- TGF-β-FOXO経路は,CML LICの維持に不可欠である.
- この経路をターゲットにすることは,CMLの根絶のための有望な治療戦略を提供します.
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