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Nuclear factor kappaB is downregulated and correlates with p53 in the Min mouse mucosa during an accelerated tumor

Johanna Rajakangas1, Anne-Maria Pajari, Marjo Misikangas

  • 1Department of Applied Chemistry and Microbiology, Division of Nutrition, University of Helsinki, Helsinki, Finland.

International Journal of Cancer
|July 29, 2005
PubMed

Insights

Nuclear factor kappa B (NF-kappaB) p65 levels were studied in a mouse model of colon cancer. An inulin diet accelerated adenoma growth, altering p65 signaling and suggesting a role in p53-dependent apoptosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • The nuclear factor kappaB (NF-kappaB) signaling pathway is implicated in cancer development.
  • Understanding NF-kappaB's role in colon adenoma progression is crucial for cancer research.

Purpose of the Study:

  • To investigate the protein levels of NF-kappaB p65 subunit during adenoma growth in the Min mouse model.
  • To assess the impact of accelerated adenoma growth, induced by an inulin diet, on cell signaling pathways.
  • To evaluate the association between NF-kappaB, p53, beta-catenin, Fas, and COX-2 in colon adenomas.

Main Methods:

  • Utilized the Min mouse model for colon cancer.
  • Administered a 10% inulin diet to promote adenoma formation and growth.
  • Measured protein levels of p65, p53, beta-catenin, Fas, and COX-2 in adenoma and surrounding mucosa tissues from 9- and 15-week-old mice.

Main Results:

  • Inulin-fed mice showed significantly larger adenomas compared to controls.
  • Nuclear p65 levels correlated positively with nuclear p53 and nuclear beta-catenin in both adenoma and mucosa tissues.
  • Fas expression increased with age in the inulin group and negatively correlated with p65; COX-2 increased with age but did not correlate with p65.

Conclusions:

  • The study suggests that NF-kappaB p65 is involved in a p53-dependent apoptotic response within the Min mouse colon adenoma model.
  • Dietary interventions, like inulin, can modulate signaling pathways relevant to colon cancer progression.

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