A microassay for measuring cytosine DNA methyltransferase activity during tumor progression

Toxicology Letters
S A BelinskyJ P Issa

Abstract

The cytosine DNA methyltransferase (MT) enzyme, which catalyzes DNA methylation at CpG sites, is overexpressed at the mRNA level during the progressive stages of colon cancer. This paper describes the adaption of a sensitive microassay for determining MT enzyme activity during tumor progression in human colon and murine lung. MT activity was progressively elevated in mucosa from familial adenomatosis polyposis patients, mucosa adjacent to cancers, and in colonic adenocarcinomas when compared to colonic mucosa from control patients. In addition, the activity of this enzyme was increased in alveolar type II but not Clara cells isolated from A/J mice following carcinogen exposure and continued to increase during tumor progression. The use of a microassay for measuring MT activity indicates that changes in enzyme activity were in general agreement with previous findings of increased MT mRNA levels during colon cancer progression and also implicates the involvement of this pathway in lung cancer development.

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Citations

Aug 23, 2002·Seminars in Cancer Biology·John R Melki, Susan J Clark
Jul 2, 2010·The Journal of Clinical Investigation·Chung-Fan LeeLi-Jung Juan
Sep 12, 2001·The Journal of Biological Chemistry·D R HodgeW L Farrar

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