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Suppression of intestinal neoplasia by DNA hypomethylation

P W Laird1, L Jackson-Grusby, A Fazeli

  • 1Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge 02142, USA.

Cell
|April 21, 1995
PubMed

Insights

Reducing DNA methyltransferase activity significantly decreased intestinal tumors in mice. This suggests DNA methyltransferase contributes to tumor development and may play a role in colorectal cancer mutations.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • ApcMin mice are a model for intestinal neoplasia.
  • DNA methyltransferase (DNMT) activity is crucial in epigenetic regulation.
  • The role of DNMT in intestinal tumor development requires further elucidation.

Purpose of the Study:

  • To investigate the impact of reduced DNA methyltransferase activity on ApcMin-induced intestinal neoplasia in mice.
  • To determine if DNA hypomethylation contributes to tumor development.

Main Methods:

  • Utilized a combination of genetic modification (DNMT heterozygosity) and pharmacological inhibition (5-aza-deoxycytidine) in ApcMin mice.
  • Quantified the number of intestinal adenomas in control versus treated groups.

Main Results:

  • Reduced DNMT activity in heterozygote Min mice led to a dramatic decrease in intestinal adenomas, from an average of 113 to just 2 polyps.
  • This highlights a substantial contribution of DNMT activity to tumor development in this model.

Conclusions:

  • DNA methyltransferase activity plays a significant role in the development of intestinal tumors in the ApcMin mouse model.
  • The findings do not support an oncogenic role for DNA hypomethylation.
  • Results align with DNMT's role in generating C to T transitions observed in human colorectal cancers.

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