Related Experiment Video
Updated: Jul 9, 2026
09:41
Reconstitution Of β-catenin Degradation In Xenopus Egg Extract
Published on: June 17, 2014
Amyloid precursor protein modulates beta-catenin degradation
1Department of Geriatrics, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA. chenyuzhi@uams.edu
Journal of Neuroinflammation
|December 12, 2007
Summary
Amyloid precursor protein (APP) regulates beta-catenin levels, impacting Alzheimer's disease (AD) pathogenesis. APP expression promotes beta-catenin degradation, crucial for neuronal function and preventing cell cycle reactivation.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Alzheimer's disease (AD) is genetically linked to the amyloid precursor protein (APP).
- Understanding APP's function is vital for deciphering AD pathogenesis and developing therapeutics.
Purpose of the Study:
- To investigate the role of APP in regulating beta-catenin signaling.
- To determine how APP affects beta-catenin degradation and its downstream effects.
Main Methods:
- Studied APP expression in primary neurons and APP knockout animal models.
- Utilized Western blotting to assess protein levels and phosphorylation.
- Examined beta-catenin localization and its downstream target, cyclin D1.
Main Results:
- APP expression induces beta-catenin phosphorylation, leading to its degradation.
- APP knockdown or knockout increases beta-catenin levels and upregulates cyclin D1.
- APP downregulates beta-catenin in neurons, potentially maintaining synaptic integrity.
Conclusions:
- APP modulates beta-catenin degradation both in vitro and in vivo.
- APP's role in beta-catenin downregulation suggests implications for AD pathogenesis.
- Further research is needed to explore APP processing and its link to abnormal beta-catenin levels in AD.
Related Concept Videos
01:23Catenins
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...
02:58Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
02:58Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
00:50Anaphase Promoting Complex
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
02:54Canonical 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...
01:39Mitochondrial Precursor Proteins
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...
Most of the mitochondrial precursors...