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Tumorigenesis in the multiple intestinal neoplasia mouse: redundancy of negative regulators and specificity of

R B Halberg1, D S Katzung, P D Hoff

  • 1McArdle Laboratory for Cancer Research, Department of Biostatistics, University of Wisconsin, Madison, WI 53706, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 15, 2000
PubMed

Insights

Tumor suppressor gene interactions were studied in mice. p53 deficiency worsened intestinal tumors and desmoid fibromas, but modifiers like Mom1 and drug combinations showed therapeutic potential.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Tumor suppressor genes, such as Adenomatous Polyposis Coli (Apc) and p53, play critical roles in preventing cancer.
  • Interactions between these genes can influence tumor development and progression, but are often confounded by genetic background.
  • Understanding these interactions is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To investigate the functional interaction between Apc and p53 tumor suppressor genes.
  • To analyze the impact of p53 deficiency on intestinal adenoma and desmoid fibroma development in Apc(Min/+) mice.
  • To evaluate the efficacy of known modifiers (Mom1) and pharmacological agents (piroxicam, difluoromethylornithine) in modulating tumor formation in the absence of p53.

Main Methods:

  • Utilized congenic mouse strains to minimize genetic background variability.
  • Studied Apc(Min/+) mice with and without functional p53.
  • Assessed intestinal adenoma multiplicity and invasiveness, and desmoid fibroma occurrence.
  • Administered the genetic modifier Mom1 and/or pharmacological agents piroxicam and difluoromethylornithine.

Main Results:

  • p53 deficiency significantly enhanced the multiplicity and invasiveness of intestinal adenomas in Apc(Min/+) mice.
  • p53 deficiency also strongly increased the occurrence of desmoid fibromas.
  • The genetic modifier Mom1 and the drug combination of piroxicam and difluoromethylornithine reduced intestinal adenoma multiplicity in p53-deficient mice.
  • Mom1 did not affect desmoid fibroma development, while the drug combination had a moderate effect.

Conclusions:

  • There is a significant synergistic interaction between Apc and p53 in suppressing intestinal tumorigenesis and desmoid fibroma formation.
  • Tissue-specific effects of tumor suppressors and modifiers are evident.
  • Targeting modifiers and utilizing drug combinations may offer therapeutic strategies for cancers with compromised tumor suppressor function.

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