ノッチ・シグナリング・パスウェイにおけるダイナミック・リガンド・ディクリミネーション
Nagarajan Nandagopal1, Leah A Santat1, Lauren LeBon2
1Howard Hughes Medical Institute and Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
Cell
|February 6, 2018
まとめ
細胞はDll1とDll4リガンドをノッチ1受容体によって区別するためにシグナルダイナミクスを使用する. このダイナミックなシグナリングは 異なる標的遺伝子発現と 生物学的結果を制御し 新しいコミュニケーションメカニズムを明らかにします
科学分野:
- 細胞生物学
- 発達生物学
- 分子信号
背景:
- 細胞同士のコミュニケーションには 重要な役割を果たします
- 異なるノッチ・リガンドが存在するが,細胞がそれらをどのように区別するかは不明である.
研究 の 目的:
- 細胞がDll1とDll4のノッチリガンドを区別するメカニズムを調査する.
- リガンド特異的なシグナルダイナミクスが標的遺伝子発現と細胞機能をどのように調節するかを理解する.
主な方法:
- Notch1受容体の活性化の定量的な単細胞イメージング
- Notch標的遺伝子 (Hes1,Hey1,HeyL) 発現の分析
- Dll1 と Dll4 の子宮外発現はチキのニューラル・クライスト細胞で.
- リガンド-受容体相互作用を研究するためのキメリックリガンド分析.
主要な成果:
- Dll1は周波数調節パルスで Notch1を活性化し,Hes1を上調する.
- Dll4は持続的な振幅調節信号でNotch1を活性化し,Hey1とHeyLを上調する.
- In vivoの実験では,Dll1とDll4は,肌の分化に相反する効果があることが示されています.
- リガンド受容体のクラスタリングは,リガンド同一性のダイナミックなエンコーディングに関与する.
結論:
- 細胞ダイナミクス,特にパルス周波数と振幅をシグナリングすることは,ノッチリガンドの区別の鍵です.
- このノッチ1によるリガンド差別は,様々な発達プロセスに重大な影響を及ぼします.
- 発見はノッチ経路内の 複雑な通信システムを明らかにした
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