Related Experiment Video

Updated: Jul 2, 2026

Reconstitution Of β-catenin Degradation In Xenopus Egg Extract
09:41

Reconstitution Of β-catenin Degradation In Xenopus Egg Extract

Published on: June 17, 2014

RUNX3 attenuates beta-catenin/T cell factors in intestinal tumorigenesis

Kosei Ito1, Anthony Chee-Beng Lim, Manuel Salto-Tellez

  • 1Institute of Molecular and Cell Biology, Proteos, 61 Biopolis Drive, Singapore 138673.

Cancer Cell
|September 6, 2008
PubMed

Insights

RUNX3 acts as a tumor suppressor in the gut by inhibiting the Wnt pathway. Its inactivation independently causes intestinal adenomas, which may progress to colon cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gastroenterology

Background:

  • APC gene mutations activate beta-catenin, initiating Wnt pathway signaling and promoting intestinal tumorigenesis.
  • The Wnt pathway plays a crucial role in intestinal epithelial cell regulation and its dysregulation is linked to colorectal cancer.
  • Tumor suppressors can act through various mechanisms, including modulation of key signaling pathways like Wnt.

Purpose of the Study:

  • To investigate the role of RUNX3 in intestinal tumorigenesis.
  • To determine if RUNX3 inactivation can independently induce intestinal adenomas.
  • To elucidate the mechanism by which RUNX3 affects Wnt signaling.

Main Methods:

  • Analysis of RUNX3 expression and function in human colorectal adenomas and cancers.
  • Genomic and molecular analysis of sporadic colorectal adenomas and Runx3(+/-) mouse intestinal adenomas.
  • Biochemical assays to assess the interaction of RUNX3 with beta-catenin/TCF4 complex.

Main Results:

  • RUNX3 forms a ternary complex with beta-catenin/TCF4, attenuating Wnt signaling.
  • RUNX3 inactivation was observed in a significant fraction of human and mouse intestinal adenomas, independent of beta-catenin accumulation.
  • RUNX3 inactivation alone can initiate intestinal adenoma formation.
  • RUNX3 inactivation frequently co-occurs with beta-catenin accumulation in human colon cancers, suggesting a role in malignant progression.

Conclusions:

  • RUNX3 functions as a tumor suppressor in the intestine by attenuating Wnt signaling.
  • RUNX3 inactivation is an independent driver of intestinal adenoma formation.
  • RUNX3 alterations may contribute to the progression of intestinal adenomas to colon cancer.

Related Concept Videos

Role Of Notch Signalling In Intestinal Stem Cell Renewal01:12

Role Of Notch Signalling In Intestinal Stem Cell Renewal

Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
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...
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...
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...
Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal01:22

Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal

Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.