白血病におけるPTENの作用は,組織マイクロ環境によって決定される
Cornelius Miething1, Claudio Scuoppo2, Benedikt Bosbach3
11] Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA [2] Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA [3] Department of Medicine I, Medical Center - University of Freiburg, 79106 Freiburg, Germany.
Nature
|May 9, 2014
まとめ
PTEN腫瘍抑制遺伝子の喪失は,T細胞急性リンパ性白血病を促進する. PTENを再活性化すると,白血病の広がりは減少するが,腫瘍の負荷は減少せず,癌の進行におけるマイクロ環境の役割を強調した.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 重要な腫瘍抑制遺伝子であるPTENは,遺伝子の変異により,様々ながんでは頻繁に表情が低下しています.
- PTENは,細胞成長と生存シグナル伝達に不可欠なPI3K/AKT/mTOR経路に対抗する.
研究 の 目的:
- 持続的なPTEN不活性化が悪性がんの維持に不可欠であるかどうかを調査する.
- T細胞急性リンパ性白血病 (T-ALL) の発症および進行に対するPTEN調節の影響を調査する.
主な方法:
- テトラサイクリン依存型RNA干渉による新型トランスジェニックマウスモデルの開発で,一時的および組織特異的なPTEN調節を行う.
- 生後PTENを血液形成部でノックダウンしてT-ALLを誘発する.
- 白血病の拡散と腫瘍負荷に対するPTEN再活性化の効果の分析.
主要な成果:
- 血液形成細胞における産後Ptenノックダウンにより,高度に拡散したT-ALL.
- PTENの再活性化は主にT-ALLの拡散を減少させ,血液形成器官における腫瘍負荷に最小限の影響を及ぼした.
- 白血病の腸内浸透は,CCR9のシグナル伝達に依存しており,これはPTENの損失によって強化された.
結論:
- PTENの喪失は,Gタンパク質結合受容体シグナル伝達を通じて,腫瘍の成長と侵入を誘導し,困難な環境でも可能である.
- 腫瘍の維持におけるPTEN喪失の役割は,文脈に依存し,組織マイクロ環境の影響を受け,遺伝子型独立の腫瘍内異質性に寄与する.
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