Related Experiment Video

Updated: Aug 20, 2026

The Soft Agar Colony Formation Assay
08:01

The Soft Agar Colony Formation Assay

Published on: October 27, 2014

Both ERK and Wnt/beta-catenin pathways are involved in Wnt3a-induced proliferation

Mi-Sun Yun1, Sung-Eun Kim, Soung Hoo Jeon

  • 1Department of Biotechnology, Yonsei University, Seoul 120-752, Korea.

Journal of Cell Science
|December 24, 2004
PubMed

Insights

Wnt3a protein promotes fibroblast proliferation through both the Wnt/beta-catenin and extracellular signal-regulated kinase (ERK) pathways. These pathways are activated by Wnt3a, influencing cell cycle progression.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The Wnt protein family plays a crucial role in regulating cell growth and development.
  • Understanding the specific mechanisms of Wnt signaling in cell proliferation is essential for developmental biology and cancer research.

Purpose of the Study:

  • To investigate the role of Wnt3a in fibroblast cell proliferation.
  • To elucidate the specific signaling pathways, including Wnt/beta-catenin and ERK, involved in Wnt3a-induced proliferation.

Main Methods:

  • Utilized NIH3T3 fibroblast cells for experiments.
  • Employed small interfering RNA (siRNA) to inhibit beta-catenin and ERK.
  • Investigated the activation of the Raf-1-MEK-ERK cascade.
  • Assessed cell cycle progression from G1 to S phase.
  • Used dominant-negative Tcf-4 to study pathway interactions.

Main Results:

  • Wnt3a significantly induced fibroblast proliferation.
  • Both beta-catenin and ERK pathways were found to be critical for Wnt3a-induced proliferation.
  • Wnt3a activated the ERK cascade independently of beta-catenin, suggesting multiple activation levels.
  • Wnt3a promoted cell cycle progression, which was dependent on ERK pathway activation.

Conclusions:

  • Wnt3a stimulates fibroblast proliferation via activation of both the Wnt/beta-catenin and ERK signaling pathways.
  • ERK pathway activation by Wnt signaling can occur through beta-catenin-independent mechanisms.
  • Wnt3a's role in promoting cell proliferation involves the regulation of cell cycle progression through the ERK pathway.

More Related Videos

Reconstitution Of β-catenin Degradation In Xenopus Egg Extract09:41

Reconstitution Of β-catenin Degradation In Xenopus Egg Extract

Published on: June 17, 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...
Catenins01:23

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...
Cadherins in Tissue Organization01:19

Cadherins in Tissue Organization

The cadherins are a superfamily of cell adhesion molecules comprising over 180 variants, with specific tissues expressing a particular combination of cadherin types. Cadherins generally exhibit homophilic binding; i.e., cadherins on one cell bind to cadherins of the same or closely related type on another cell. Thus, cells of the same type have a specific affinity to bind to each other and sort themselves into clusters to form tissues.
Cell Sorting During Development
Cell sorting plays an...
MAPK Signaling Cascades01:07

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...