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Published in: Journal of Cancer Research and Clinical Oncology 5/2008

01-05-2008 | Original Paper

Stat3 up-regulates expression of nicotinamide N-methyltransferase in human cancer cells

Authors: Mikio Tomida, Hideki Ohtake, Takashi Yokota, Yasuhito Kobayashi, Masafumi Kurosumi

Published in: Journal of Cancer Research and Clinical Oncology | Issue 5/2008

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Abstract

Purpose

To discover new molecular targets for cancer therapy and diagnosis, we surveyed signal transducers and activators of transcription 3 (Stat3)-regulated genes, because constitutive activation of Stat3 is associated with a wide variety of human malignancies.

Methods

We investigated the Stat3-regulated genes in 293 cells with cDNA microarray analysis and found that Nicotinamide N-methyltransferase (NNMT) was induced on stimulation of the cells with leukemia inhibitory factor. We examined the expression of NNMT in several types of cancer cells by real-time quantitative RT-PCR. To examine the role of Stat3, Hep-G2 hepatocellular carcinoma cells were transfected with NNMT promoter-luciferase reporter construct together with conditionally active Stat3 (Stat3ER) or dominant-negative Stat3 expression vector and NNMT promoter activity was determined. The expression of NNMT and activated Stat3 in 88 colon cancer tissues and 17 normal colon tissues was examined with immunohistochemical analysis.

Results

In Hep-G2 cells and SW480 colon cancer cells, NNMT expression increased on stimulation of the cells with interleukin 6. NNMT promoter activity in Hep-G2 cells was dependent on the activation of Stat3. MDA-MB-468 breast cancer cells and HT29 colon cancer cells expressed constitutively a high level of NNMT. Treatment of these cells with Stat3 siRNA or curcumin, which inhibited Stat3 phosphorylation, resulted in reduction of the NNMT level. We found a correlation between the expression of NNMT and activated Stat3 (P < 0.001) in the colon cancer tissues.

Conclusion

NNMT is a novel Stat3-regulated gene. Its expression is enhanced with the activation of Stat3 in colon cancer tissues. NNMT may be a potential candidate for a tumor marker of various kinds of cancers.
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Metadata
Title
Stat3 up-regulates expression of nicotinamide N-methyltransferase in human cancer cells
Authors
Mikio Tomida
Hideki Ohtake
Takashi Yokota
Yasuhito Kobayashi
Masafumi Kurosumi
Publication date
01-05-2008
Publisher
Springer-Verlag
Published in
Journal of Cancer Research and Clinical Oncology / Issue 5/2008
Print ISSN: 0171-5216
Electronic ISSN: 1432-1335
DOI
https://doi.org/10.1007/s00432-007-0318-6

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