複数の腫瘍抑制経路がテロメラーゼを否定的に調節する
Shiaw Yih Lin1, Stephen J Elledge
1Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.
Cell
|July 3, 2003
まとめ
テロメラーゼ (hTERT) はほとんどの細胞で抑制されているが,がんでは活性化している. この研究は,hTERTを調節する3つの腫瘍抑制経路 (Mad1/c-Myc,SIP1,およびMenin) を特定し,がんの発症に関する洞察を明らかにしました.
科学分野:
- 分子生物学は分子生物学である.
- がん研究 がん研究
- 遺伝学 遺伝学とは
背景:
- テロメラーゼ発現は,体細胞では典型的に抑制されるが,幹細胞や多くのヒトがんでは活性化される.
- テロメラーゼの活動は,腫瘍発生と幹細胞の性質の維持に不可欠であると仮定されています.
- テロメラーゼの調節を理解することは,がん治療の開発の鍵です.
研究 の 目的:
- ヒトテロメラーゼ逆転写酵素 (hTERT) 発現の負の調節体を特定する.
- テロメラーゼ活性制御における腫瘍抑制剤と腫瘍遺伝子の経路の役割を明らかにする.
主な方法:
- 一般的な遺伝子スクリーンを用いて,hTERTのネガティブレギュレータを特定しました.
- hTERT抑制に関連するMad1/c-Myc,TGF-β/SIP1,およびメニンの経路を調査しました.
- メニンの枯渇がヒトの原生線維芽細胞と変異フェノタイプに与える影響を評価した.
主要な成果:
- hTERT抑制に関与する3つの異なる腫瘍抑制/腫瘍遺伝子の経路が特定されました:Mad1/c-Myc,SIP1 (TGF-β標的) とMenin.
- Mad1/c-Myc経路がhTERT調節における役割を確認した.
- SIP1がTGF-β調節されたhTERT抑制を媒介することを示した.
- ショウド・メニンはhTERTを直接抑制し,その枯渇はフィブロブラストを不死にし,変換を促進します.
結論:
- 複数の腫瘍抑制剤と腫瘍遺伝子の経路は,hTERT発現を抑制するために調整されます.
- 人間の腫瘍におけるテロメラーゼ再活性化は,これらの調節経路を乱す腫瘍学的変異によって起こる可能性が高い.
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