Related Experiment Video

Updated: Jun 2, 2026

Modeling Paracrine Noncanonical Wnt Signaling In Vitro
11:14

Modeling Paracrine Noncanonical Wnt Signaling In Vitro

Published on: December 10, 2021

Identification of a novel inhibitor of the canonical Wnt pathway

Kyoungmin Park1, Kyungwon Lee, Bin Zhang

  • 1Department of Physiology, Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, usa.

Molecular and Cellular Biology
|May 18, 2011
PubMed

Insights

Pigment epithelium-derived factor (PEDF) inhibits Wnt signaling by binding to LRP6, blocking downstream effects. This discovery reveals a new mechanism for PEDF

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Ophthalmology

Background:

  • Wnt signaling regulates key cellular processes like angiogenesis and fibrosis.
  • Diabetic retinopathy involves complex pathological pathways.

Purpose of the Study:

  • To identify novel regulators of the Wnt pathway.
  • To investigate the role of pigment epithelium-derived factor (PEDF) in Wnt signaling and its potential therapeutic implications.

Main Methods:

  • Overexpression and knockdown studies of PEDF in transgenic mice and cell cultures.
  • Small interfering RNA (siRNA) mediated knockdown and knockout mouse models.
  • Biochemical assays including co-precipitation to confirm protein interactions.
  • Analysis of Wnt signaling activation and inhibition.

Main Results:

  • Pigment epithelium-derived factor (PEDF) was identified as a novel inhibitor of the Wnt pathway.
  • PEDF directly binds to the Wnt coreceptor LRP6 with high affinity.
  • PEDF binding prevents LRP6-Frizzled receptor dimerization, thereby blocking Wnt ligand-induced signaling.
  • PEDF administration or overexpression attenuated Wnt signaling, while PEDF deficiency activated it.

Conclusions:

  • Pigment epithelium-derived factor (PEDF) acts as an endogenous antagonist of LRP6.
  • Blocking Wnt signaling via PEDF represents a potential therapeutic strategy for conditions like diabetic retinopathy.

More Related Videos

The Soft Agar Colony Formation Assay08:01

The Soft Agar Colony Formation Assay

Published on: October 27, 2014

Related Concept Videos

Non-Canonical Wnt Signaling Pathways01:41

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 Pathways01:41

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 Pathway02:54

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 Pathway02:54

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...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
Inhibition of CDK Activity02:34

Inhibition of CDK Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...