spliceosomeは,MYCが誘発するがんの治療上の脆弱性である
Tiffany Y-T Hsu1,2,3,4, Lukas M Simon4, Nicholas J Neill1,4
1Verna &Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, Texas 77030, USA.
Nature
|September 3, 2015
まとめ
MYCの過剰発現は,RNA処理の重要なメカニズムであるスプリセソームをストレスにさらします. spliceosomeを阻害すると MYCが誘導する癌細胞を選択的に傷つけ,新しい治療標的を提示します.
科学分野:
- 腫瘍学
- 分子生物学
- 癌 の 遺伝子
背景:
- MYC (c-MYC) はヒトがんの一般的な原動力ですが,治療的に抑制することは困難です.
- 腫瘍性MYCはRNAとタンパク質の合成を増加させ,細胞機械に負荷を与える可能性があります.
- RNA処理を担当するスプライソームは,MYC駆動がんの潜在的な標的として調査されています.
研究 の 目的:
- MYCによるがんの新たな治療標的を特定する.
- MYCによる腫瘍形成におけるスプライソームの役割を調査する.
- MYCとスプライソームの間の合成的致死性を調査する.
主な方法:
- ヒト乳腺上皮細胞におけるMYC合成の致死性遺伝子としてBUD31の識別
- BUD31をコア・スプライソーム成分として特徴づけること.
- spliceosomeの機能の評価 in vitroとin vivoでMYCの過剰活性化による
- スプライソームの遺伝的および薬学的阻害
主要な成果:
- BUD31はスプライソームの組立と活動に不可欠であり,その抑制はMYC過剰発現する細胞で致命的です.
- MYCの過剰活性化により,前駆体伝達 RNAの合成が増加し,スプライセソームにストレスが与えられます.
- MYC過活性化細胞におけるスプリセソーム阻害は,グローバル・イントロン保持とmRNA前成熟の欠陥を引き起こします.
- spliceosomeの抑制は,MYC依存性乳がんの生存,腫瘍発生性,および転移を損なう.
結論:
- 腫瘍性MYCは,スプライソームに付随的なストレスを引き起こす.
- スプライソームはMYCが誘発するがんの治療における新たな脆弱性を表しています.
- MYC依存性悪性腫瘍の治療には,スプライソーム成分をターゲットにすることが有望な戦略です.
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