相关实验视频
Updated: Jul 5, 2026

09:41
Reconstitution Of β-catenin Degradation In Xenopus Egg Extract
Published on: June 17, 2014
在正规Wnt信号发送过程中,Rac1激活控制了β-catenin的核定位
Ximei Wu1, Xiaolin Tu, Kyu Sang Joeng
1Department of Medicine, Washington University Medical School, St. Louis, MO 63110, USA.
Cell
|April 22, 2008
概括
在Wnt信号中,Rac1的激活对于核β-catenin的积累至关重要. 这一途径涉及JNK2激酶和特定的β-catenin酸化位,对于胚胎肢体的发育至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 发育生物学 发展生物学
- 分子信号传输的方法
背景情况:
- 规范性Wnt信号传递对于细胞在发育和疾病期间的命运和增殖至关重要.
- β-catenin的核定位是正规Wnt信号传输中的关键步骤.
- 调节β-catenin进入核中的精确机制仍然不完全理解.
研究的目的:
- 为了阐明控制β-catenin核定位的机制,以响应Wnt信号.
- 调查Rac1在Wnt诱导的β-catenin核积累中的作用.
- 探索准这种途径的治疗潜力.
主要方法:
- 研究了Rac1激活对Wnt诱导的β-catenin核积累的要求.
- 研究了JNK2激酶在化β-catenin中在Ser191和Ser605.5的作用.
- 在小鼠胚胎四肢芽外皮中利用了Rac1的遗传切除.
- 分析了Rac1,β-catenin和Dkk1.1之间的遗传相互作用.
主要成果:
- 在Wnt刺激后,β-catenin的核积累需要Rac1激活.
- Rac1的功能依赖于JNK2介导的β-catenin在Ser191和Ser605.5的酸化.
- 这些酸化位点的突变会影响Wnt诱导的β-catenin进入核.
- 在小鼠四肢芽外皮中Rac1的遗传删除会破坏Wnt信号传递和四肢发育.
- 在控制肢体外生长方面,rac1与β-catenin和Dkk1表现出遗传相互作用.
结论:
- Rac1激活和随后的β-catenin酸化代表了一种控制规范Wnt信号的新机制.
- 这一途径对于胚胎肢体发育至关重要.
- 鉴定的机制为Wnt途径相关疾病提供了潜在的治疗点.
相关概念视频
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...
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...
Catenins
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 adherens...
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 adherens...
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
