腸の幹細胞ニッチにおける短距離Wntグラデーションの可視化
Henner F Farin1,2,3,4, Ingrid Jordens5, Mohammed H Mosa2,3,4
1Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences (KNAW) and University Medical Center Utrecht, 3584CT Utrecht, the Netherlands.
Nature
|February 11, 2016
まとめ
この研究では,Wnt3のタンパク質の動きを in vivoで視覚化して,それが幹細胞分裂によって細胞に結合して移動することを明らかにしました. この発見は,腸の幹細胞活動が Wnt 信号グラデーションによってどのように調節されているかを明らかにしています.
科学分野:
- 細胞生物学
- 発達生物学
- 幹細胞生物学
背景:
- WNTタンパク質は 細胞の運命を制御する 重要な短距離信号です
- 生体内での可視化と輸送メカニズムは不明である.
- Wntのシグナルグラデーションは腸のクリプト幹細胞の自己再生,増殖,分化を調整する.
研究 の 目的:
- Wnt3タンパク質の動きを視覚化するために
- 腸内密室におけるWnt3輸送とグラデント形成のメカニズムを解明する.
主な方法:
- エピトープタグ付き,機能的なWnt3ノックインマウスモデルを生成した.
- 腸内オルガノイドと顕微鏡を用いて,Wnt3の局所化と移転を観察した.
- Wnt3の分泌を操作し 幹細胞の増殖を止めました
主要な成果:
- 視覚化されたWnt3は,パネス細胞の隣接する幹細胞の基礎側膜に局限する.
- 証明された Wnt3 伝達には直接の細胞接触と Frizzled 受容体の発現が必要である.
- 示すWnt3は,拡散ではなく,主に細胞分裂 (細胞結合) 経由で移動する.
結論:
- 幹細胞膜はWntタンパク質の貯蔵庫として機能する.
- 細胞分裂による膜の希釈が Wnt3のグラデーションを形作る.
- これは,Wntタンパク質の輸送と幹細胞の調節に関する新しい理解を提供します.
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