サイトキネシスの失敗は,ヒッポの腫瘍抑制器経路の活性化を誘発する
Neil J Ganem1, Hauke Cornils1, Shang-Yi Chiu1
1Howard Hughes Medical Institute, Department of Pediatric Oncology, Dana-Farber Cancer Institute, Children's Hospital and Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
Cell
|August 16, 2014
まとめ
腫瘍に多く見られるテトラプロイド細胞は,サイトキネシスの失敗と余分なセンターソームにより,ヒッポ経路を活性化させます. LATS2を含むこの経路は,p53を安定させ,YAP/TAZを抑制し,腫瘍抑制メカニズムとして作用します.
科学分野:
- 細胞生物学 細胞生物学
- 癌生物学 癌生物学について
- 遺伝学 遺伝学とは
背景:
- ゲノム倍増によって特徴づけられるテトラプロイディは,約37%のヒト腫瘍で観察され,腫瘍発生を促進する可能性があります.
- p53依存のバリアは,通常,テトラプロイド細胞の増殖を抑制しますが,基礎となる細胞欠陥とシグナル伝達経路は,ほとんど不明のままです.
研究 の 目的:
- テトラプロイド細胞の成長抑制を誘発する細胞欠陥とシグナル伝達経路を特定する.
- テトラプロイド細胞の成長抑制と腫瘍抑制におけるヒッポ経路の役割を明らかにする.
主な方法:
- RNA干渉 (RNAi) スクリーニングを使用して,テトラプロイド細胞の成長抑制に関与する遺伝子を特定しました.
- テトラプロイド細胞の適応メカニズムを研究するために,in vitro進化のアプローチを採用した.
- 培養細胞と自然に発生するテトラプロイド細胞の両方でHippo経路の活性化を調査しました.
主要な成果:
- テトラプロイド細胞における細胞運動の失敗が,ヒッポの腫瘍抑制経路を活性化することを示した.
- 余分なセンターソームが,小さなGタンパク質のシグナル伝達を変え,LATS2キナーゼを活性化することによって,ヒッポス経路誘導に寄与することを示した.
- LATS2がp53を安定させ,YAPとTAZの転写レギュレータを抑制することを確認しました.
結論:
- ヒッポの経路は,細胞運動の失敗と四倍体細胞の余分なセンターソームによって活性化される重要な腫瘍抑制メカニズムとして作用します.
- 研究結果は,テトラプロイド細胞がどのように抑制されるかを明らかにし,腫瘍細胞がこの調節を回避するための潜在的適応メカニズムを示唆しています.
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