Inhibition of DNA Methyltransferase Stimulates the Expression of Signal Transducer and Activator of Transcription 1, 2, and 3 Genes in Colon Tumor Cells

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1999 Nov 26

PMID 10570189

Citations 64

Authors

A R Karpf

P W Peterson

J T Rawlins

B K Dalley

Q Yang

H Albertsen

D A Jones

Affiliations

Soon will be listed here.

Abstract

Inhibitors of DNA methyltransferase, typified by 5-aza-2'-deoxycytidine (5-Aza-CdR), induce the expression of genes transcriptionally down-regulated by de novo methylation in tumor cells. We utilized gene expression microarrays to examine the effects of 5-Aza-CdR treatment in HT29 colon adenocarcinoma cells. This analysis revealed the induction of a set of genes that implicated IFN signaling in the HT29 cellular response to 5-Aza-CdR. Subsequent investigations revealed that the induction of this gene set correlates with the induction of signal transducer and activator of transcription (STAT) 1, 2, and 3 genes and their activation by endogenous IFN-alpha. These observations implicate the induction of the IFN-response pathway as a major cellular response to 5-Aza-CdR and suggests that the expression of STATs 1, 2, and 3 can be regulated by DNA methylation. Consistent with STAT's limiting cell responsiveness to IFN, we found that 5-Aza-CdR treatment sensitized HT29 cells to growth inhibition by exogenous IFN-alpha2a, indicating that 5-Aza-CdR should be investigated as a potentiator of IFN responsiveness in certain IFN-resistant tumors.

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