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Related Experiment Videos

Colon cancer cells: pro-invasive signalling.

Delphine Debruyne1, Maria José Oliveira, Marc Bracke

  • 1Laboratory of Experimental Cancerology, Department of Radiotherapy and Nuclear Medicine, Ghent University Hospital, De Pintelaan 185, 1P7, B-9000 Ghent, Belgium.

The International Journal of Biochemistry & Cell Biology
|March 4, 2006
PubMed
Summary

Colon cancer arises from faulty epithelial cell renewal. Enteric bacteria produce a peptide that promotes invasion, which is blocked by naloxone, suggesting opioids may influence tumor behavior.

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Area of Science:

  • Gastroenterology
  • Oncology
  • Microbiology

Background:

  • Colon cancer involves abnormal renewal of the enteric epithelium, leading to uncontrolled cell proliferation and invasion.
  • E-cadherin plays a role in suppressing invasion, and its dysfunction contributes to colon cancer progression.
  • Enteric bacteria, including Listeria monocytogenes, are implicated in stimulating cancer cell invasion.

Purpose of the Study:

  • To investigate the role of enteric bacteria and their products in colon cancer cell invasion.
  • To identify the molecular mechanisms by which bacterial peptides promote invasion.
  • To explore the potential therapeutic implications of targeting these pathways.

Main Methods:

  • Analysis of colon cancer cell renewal and invasion processes.

Related Experiment Videos

  • Investigation of Listeria monocytogenes and other enteric bacteria.
  • Identification and characterization of a beta-casein-derived peptide.
  • Study of signaling pathways involving small guanosine triphosphatases and the delta opioid receptor.
  • Testing the effect of naloxone, a delta opioid receptor antagonist.

    • Main Results:

    • Enteric bacteria produce a 13-amino acid peptide that stimulates colon cancer cell invasion.
    • This peptide signals through small guanosine triphosphatases, affecting the actin cytoskeleton.
    • The peptide also signals via phosphorylation of the delta opioid receptor.
    • Naloxone effectively neutralizes the pro-invasive activity of the peptide.

    Conclusions:

    • A bacterial peptide derived from beta-casein promotes colon cancer invasion.
    • The delta opioid receptor is involved in mediating the pro-invasive effects of this peptide.
    • Opioids may play a significant role in colon cancer malignancy and invasion.