関連する実験動画
Updated: May 31, 2026

11:14
Modeling Paracrine Noncanonical Wnt Signaling In Vitro
Published on: December 10, 2021
Lgr5の同類体はWnt受容体と結合し,R-スポンジンのシグナル伝達を媒介する
Wim de Lau1, Nick Barker, Teck Y Low
1Hubrecht Institute and University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands.
Nature
|July 6, 2011
まとめ
レウシンに富んだGタンパク質結合受容体5 (Lgr5) とLgr4は,Wnt経路の重要な構成要素である. これらの遺伝子を削除すると腸の幹細胞機能が低下しますが,R-スポンジンはLgr4/5.5経由でWnt信号伝達を強化することができます.
科学分野:
- 細胞生物学 細胞生物学
- 発達生物学 発達生物学について
- 分子生物学は分子生物学である.
背景:
- レウシンに富んだリピートを含むGタンパク質結合受容体5 (Lgr5) とその同位体Lgr4は,Wnt駆動の増殖コンパートメントで共発現する.
- これらの受容体はWntシグナル伝達に関与しており,組織の発達と再生に不可欠です.
研究 の 目的:
- ネズミの腸内Wnt信号伝達経路におけるLgr4およびLgr5の機能的役割を調査する.
- R-スポンジンがLgr受容体を通してWnt信号伝達を強化するメカニズムを解明する.
主な方法:
- ネズミの腸内密室でLgr4およびLgr5の条件付き遺伝子削除.
- タンパク質の相互作用を特定するための質量スペクトロメトリ.
- HEK293は,R-スポンジンとLgrタンパク質によるWnt信号調節を研究するセルアッセイである.
- ネズミの腸内クリプト培養で,遺伝子消去効果を評価する.
主要な成果:
- ネズミの腸内におけるLgr4およびLgr5の条件付き削除は,Wnt標的遺伝子の発現を阻害し,腸内密室の消滅につながります.
- Lgr4とLgr5は,Frizzled/Lrp Wnt受容体複合体と関連しています.
- R-スポンジンはLgr4,Lgr5およびLgr6に結合し,Wnt3aが誘発する信号を強化し,その機能はLgr4/5の存在に依存する.
結論:
- Lgr5の同類体は,選択的なWnt受容体の成分として作用し,R-スポンジンの信号強化を媒介する.
- これらの発見は,Lgr5同類体を発現する組織における再生医療におけるR-スポンジンの応用に関する洞察を提供します.
関連する概念動画
Non-Canonical Wnt Signaling Pathways
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
Non-Canonical Wnt Signaling Pathways
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
Canonical Wnt Signaling Pathway
The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which results in tumor...
Canonical Wnt Signaling Pathway
The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which results in tumor...
Small GTPases - Ras and Rho
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
