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Lgr5 ((+) 幹細胞のヤップ依存型再プログラムが腸の再生と癌を誘発する
Alex Gregorieff1, Yu Liu1,2, Mohammad R Inanlou1
1Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario M5G 1X5, Canada.
Nature
|October 28, 2015
まとめ
ヒッポ経路エフェクターYapは損傷後の腸の幹細胞 (ISC) を再プログラムし,Wnt信号を抑制して細胞の再生と生存を促進します. ヤップは結腸癌の発症と進行にも 重要な役割を果たします
科学分野:
- 細胞生物学
- 発達生物学
- 癌の生物学
背景:
- 腸内皮質は,Lgr5(+) 腸内幹細胞 (ISCs) とWntシグナル伝達によって常時更新される.
- 損傷後のISC再生のメカニズムは完全に理解されていません.
- ヒッポのシグナル伝達経路は 組織の成長を制御し 再生に不可欠です
研究 の 目的:
- 損傷後の腸の幹細胞再生における 河馬経路の下流エフェクターであるヤップの役割を調査する
- YapがISCの再プログラムと再生に影響を与える分子メカニズムを解明する.
- 結腸がんの発症と進行におけるヤップの役割を決定する.
主な方法:
- イオン化する放射線にさらされたマウスでの研究
- ヤップ欠乏性オーガノイドの分析とEGFRリガンドのエピレグリンに対する反応
- 大腸がんのマウスモデルにおけるヤップの役割の調査.
- 早期のAPC変異性腫瘍誘発細胞の体内研究
主要な成果:
- ヤップは放射線傷害後の腸内皮質の回復に不可欠です.
- Yapは,Wntシグナリングを抑制し,Egf経路の活性化を促進することによって,Lgr5(+) ISCを一時的に再プログラムします.
- ヤップ不活性化は,Apc (Min) マウスモデルにおける腺腫を消滅させ,腫瘍を誘発する細胞の進行に必要である.
- ヤップはパネス細胞の分化を抑制し,腫瘍細胞のEGFR信号を含む再生プログラムを誘導する.
結論:
- Yapは,組織損傷時にLgr5(+) ISCを再プログラムし,Wntのホメオスタティックプログラムを阻害し,Egfrシグナリングで再生プログラムを誘導します.
- ヤップの再生経路は 大腸がんの発症と進行の 重要な要因です
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