相关实验视频
Updated: Sep 8, 2025

08:01
The Soft Agar Colony Formation Assay
Published on: October 27, 2014
112.2K
WNT7A/B组建一个GPR124-RECK-LRP5/6共受体复合体,以激活大脑内皮细胞中的β-catenin信号
Robin Heiden1, Laura Hannig1, Calvin J Kuo2
1Institute of Anatomy and Cell Biology, University of Würzburg, Würzburg, Germany.
The Journal of biological chemistry
|September 6, 2025
概括
大脑内皮细胞中的WNT7信号涉及一种新的GPR124-RECK-LRP5/6复合体,独立于FZD受体. 这种独特的途径调节大脑血管生成和血脑屏障的完整性.
科学领域:
- 神经科学
- 分子生物学
- 发育生物学
背景情况:
- WNT7A和WNT7B对大脑发育至关重要,调节血管生成和血脑屏障 (BBB) 的完整性.
- WNT7蛋白通过大脑内皮细胞中的GPR124-RECK和FZD/LRP共同受体综合体发出信号.
- 之前的模型提出单个多受体复合体,但缺乏直接的生化证据和信号机制.
研究的目的:
- 研究大脑内皮细胞中WNT7共受体复合物的形成和信号机制.
- 阐明GPR124,RECK,FZD和LRP家族成员在WNT7中介信号传递中的特定作用.
- 区分WNT7信号通道与经典的WNT3A信号通道.
主要方法:
- 编辑CRISPR/Cas9基因以产生各种WNT途径组件的淘汰细胞系.
- 生物化学分析,包括共免疫沉,以确定蛋白质复合物的形成.
- 基于细胞的测试以测量WNT信号活动和下游化事件.
主要成果:
- 与WNT3A信号不同的是,WNT7信号在缺乏FZD的细胞中持续存在,表明FZD独立的成分.
- 淘汰GPR124,RECK或LRP5/6取消了WNT7信号,突出了它们的重要性.
- 生物化学分析显示,WNT7将LRP5/6调入GPR124-RECK,形成一个独立于FZD受体的独特信号复合体.
结论:
- 大脑内皮细胞中的WNT7信号利用了不同的共受体复合体.
- 一个新的FZD独立的GPR124-RECK-LRP5/6复合体调解WNT7信号.
- 与GPR124-RECK-LRP5/6复合体协同作用,以调节大脑发育.
相关概念视频
Canonical Wnt Signaling Pathway
8.9K
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...
8.9K
Non-Canonical Wnt Signaling Pathways
7.4K
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...
7.4K
Catenins
2.4K
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
2.4K
Assembly of Signaling Complexes
5.9K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.9K
Enzyme-linked Receptors
79.9K
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
79.9K
Transducer Mechanism: G Protein–Coupled Receptors
2.4K
G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical,...
GPCRs are also called heptahelical,...
2.4K

