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Related Concept Videos

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...
Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
Positive Regulator Molecules02:39

Positive Regulator Molecules

Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
Positive Regulator Molecules01:45

Positive Regulator Molecules

To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.

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Related Experiment Video

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In vitro Organoid Culture of Primary Mouse Colon Tumors
07:33

In vitro Organoid Culture of Primary Mouse Colon Tumors

Published on: May 17, 2013

Efficient Wnt mediated intestinal hyperproliferation requires the cyclin D2-CDK4/6 complex.

Kevin Myant1, Owen Sansom

  • 1The Beatson Institute for Cancer Research, Garscube Estate, Switchback Road, Bearsden, Glasgow, G61 1BD, UK. o.sansom@beatson.gla.ac.uk.

Cell Division
|February 4, 2011
PubMed
Summary

Inactivating the APC gene drives colorectal cancer (CRC) by activating the Wnt-c-Myc pathway. Targeting the cyclin D2-CDK4/6 complex, crucial for hyperproliferation, offers a promising chemopreventative strategy for CRC.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Gastroenterology

Background:

  • Inactivation of the adenomatous polyposis coli (APC) gene is a critical early step in colorectal cancer (CRC) development.
  • APC loss triggers beta-catenin nuclear localization, activating the beta-catenin-Tcf4 complex and driving cell cycle genes like c-Myc and cyclin D2.
  • APC loss in the intestine causes hyperproliferation, apoptosis, and altered differentiation, with c-Myc mediating these effects.

Discussion:

  • The cyclin D2-cyclin-dependent kinase 4/6 (CDK4/6) complex promotes hyperproliferation in APC-deficient intestinal tissue and adenomas.
  • The hyperproliferative phenotype from APC loss is partially dependent on cyclin D2 expression.
  • Tumor growth in ApcMin/+ mice is significantly impaired in the absence of cyclin D2.

Key Insights:

  • Pharmacological inhibition of CDK4/6 effectively suppresses adenomatous cell proliferation.
  • The cyclin D2-CDK4/6 complex is vital for colorectal adenoma formation.
  • Targeting this complex represents a potential therapeutic strategy for CRC.

Outlook:

  • Investigating druggable targets within the Wnt-c-Myc pathway, beyond transcription factors like c-Myc, is crucial for CRC therapy.
  • Inhibition of the cyclin D2-CDK4/6 complex shows potential as a chemopreventative strategy against CRC.
  • Further research into the role of cyclin D2 and CDK4/6 in intestinal tumorigenesis may yield novel therapeutic interventions.