小分子共標的CKIαと転写キナーゼCDK7/9は,臨床前モデルのAMLを制御する
Waleed Minzel1, Avanthika Venkatachalam1, Avner Fink1
1The Lautenberg Center for Immunology and Cancer Research, Institute of Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem, Israel.
Cell
|August 28, 2018
まとめ
カゼインキナーゼIα (CKIα),CDK7およびCDK9を標的とする新しい阻害剤はp53を活性化し,スーパーエンハンサーを標的として白血病を抑制する. これらの薬剤は,正常な血液細胞の発達を維持しながら,急性骨髄性白血病 (AML) の治療に有望である.
科学分野:
- 腫瘍学
- 分子生物学
- 薬物開発
背景:
- カゼインキナーゼIα (CKIα) の消去によりp53が活性化され,その分解は白血病前期におけるレナリドミドの有効性の鍵となる.
- 急性骨髄性白血病 (AML) は,スーパーエンハンスター (SE) によって調節される腫瘍遺伝子によって引き起こされます.
研究 の 目的:
- CKIα,CDK7およびCDK9を標的とした新しい阻害剤を開発し,抗白血病活性を増強する.
- AMLにおけるSEとp53活性化に対するこれらの阻害剤の作用機構を調査する.
主な方法:
- CKIαと転写キナーゼCDK7/ 9を標的とする二重阻害剤の開発
- ネズミの原発性AML細胞と患者からの異種移植におけるSEの分析
- p53の安定化,遺伝子転写抑制,アポトーシス誘導の評価
- AMLのマウスモデルと異種移植における治療効果の評価
主要な成果:
- 開発された阻害剤は,CKIα,CDK7およびCDK9を共同標的とし,p53の活性化を高めます.
- 阻害剤は,AML細胞で新たに獲得されたSEを廃止し,SE主導の腫瘍遺伝子の転写を抑制します.
- 結合抑制はp53を相乗的に安定させ,アポトーシスを誘導し,白血病の原始体を選択的に排除する.
- MLL- AF9および患者からの異種移植を含む複数のAMLモデルで治療効果が実証されました.
結論:
- CKIα/CDK7/9の二重抑制は,AMLに対する有望な治療戦略です.
- 抑制剤は,SE誘導による腫瘍遺伝子の依存を妨害することで,選択的に白血病細胞を標的とする.
- このアプローチは,保存された血液形成で白血病を治す可能性を秘めています.
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