LDL受容体関連タンパク質6は,Dickkopfタンパク質の受容体である
1Division of Molecular Embryology, Deutsches Krebsforschungszentrum, Heidelberg, Germany.
Nature
|May 18, 2001
まとめ
Dickkopf1 (dkk1) は,Wntの信号共受容体であるLRP6と結合する. この相互作用は,Wnt/β-カテニンのシグナル伝達を阻害し,Dkkタンパク質が胚の発達中にWnt共受容体の機能に敵対する方法を明らかにします.
科学分野:
- 発達生物学 発達生物学とは
- 分子生物学は分子生物学である.
- 細胞シグナル伝達 細胞信号伝達
背景:
- Wntグリコプロテインは,胚のパターニングに不可欠です.
- Wntのシグナル伝達には,ひび割れた受容体とβ-カタニンの安定化が含まれています.
- Dickkopf1 (dkk1) はWntシグナル伝達を阻害しますが,そのメカニズムは不明でした.
研究 の 目的:
- dkk1がWnt信号伝達を阻害するメカニズムを解明する.
- dkk1.1の特定の受容体を特定する.
- 胚の発達におけるdkk1とLRP6の敵対的な相互作用を調査する.
主な方法:
- dkk1とLRP6の相互作用を検査するための生化学的測定法.
- dkk1およびLRP6.1の存在下でのWnt/β-カタニンシグナル伝達の分析
- クセノプスの胚頭インダクションアッセイ.
主要な成果:
- LDL受容体関連タンパク質6 (LRP6) は,Dkk1とDkk2の特異的な高親和受容体である.
- Dkk1は,LRP6.6の異なるドメインに結合することによって,Wnt/β-カテニンのシグナル伝達を阻害する.
- Dkk1とLRP6は,Xenopusの胚頭の誘導において敵対的な役割を果たしている.
結論:
- Dickkopfタンパク質は,Wnt共受容体の機能を阻害することによって,Wntシグナル伝達を阻害する.
- この研究は,dkk1対抗性の分子メカニズムを明らかにします.
- この発見は,発達過程におけるアンタゴニストによるLRPシグナリングの調節を強調しています.
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