HIF-1は,分泌されるニューロンのチロシナゼを通して,p53-媒介によるアポプトシスをアンタゴニズする
Ataman Sendoel1, Ines Kohler, Christof Fellmann
1Institute of Molecular Life Sciences, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
Nature
|June 4, 2010
まとめ
低酸素誘導因子 (HIF) は,TYR-2を調節することにより,DNA損傷による細胞死を防ぐ. この保存されたメカニズムは,HIFが遠距離からアポトーシスにどのように影響し,癌の進行に影響を与えるかを示しています.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 低酸素誘導因子 (HIF) は,酸素レベルに対する細胞の反応を調節する.
- 腫瘍におけるHIFアルファの増加は,予後不良と相関する.
- HIFと癌におけるアポトーシスの関係については,十分に理解されていません.
研究 の 目的:
- DNA損傷によるアポトーシスにおけるHIFの役割を調査する.
- HIFがプログラム細胞死に影響を与える分子メカニズムを解明する.
主な方法:
- モデル生物としてCaenorhabditis elegansを使用しました.
- HIF-1の機能とCEP-1 (p53同型) との相互作用を研究した.
- ASJ感覚神経細胞におけるTYR-2の役割と,メラノーマ細胞におけるヒトの同型TRP2/DCTの役割を分析した.
主要な成果:
- C. elegans の HIF-1 は,CEP-1 に敵対し,生殖細胞をアポトーシスから保護する.
- ASJニューロンにおけるTYR-2のアップレギュレーションは,HIF-1の抗アポプトシス機能を媒介する.
- 人間のメラノーマ細胞におけるTRP2のノックダウンは,アポトーシスを増加させ,機能が保存されていることを示唆する.
結論:
- HIF-1は,DNA損傷によるアポトーシスに対する保護的役割を果たします.
- 分泌されたTYR-2を含む新しいシグナル伝達経路は,HIFが細胞の運命を遠隔制御することを媒介する.
- 発見は,低酸素とプログラムされた細胞死との間の進化的に保存されたリンクを明らかにします.
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