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Journal of Gastroenterology
Published in: Journal of Gastroenterology 6/2015

01-06-2015 | Original Article—Alimentary Tract

Overexpression of NRG1 promotes progression of gastric cancer by regulating the self-renewal of cancer stem cells

Authors: Myoung-Eun Han, Hyun-Jung Kim, Dong Hoon Shin, Sun-Hwi Hwang, Chi-Dug Kang, Sae-Ock Oh

Published in: Journal of Gastroenterology | Issue 6/2015

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Abstract

Background

Gastric cancer stem cells (GCSCs) have been successfully isolated from patients. However, the molecular mechanisms underlying the self-renewal of GCSCs and their relationship with the microenvironment are poorly characterized.

Methods

GCSCs and cancer-associated fibroblasts (CAFs) were cultured directly from gastric cancer patients. The self-renewal of GCSCs was assayed by sphere formation assay and in vivo tumorigenicity. Expression of neuregulin1 (NRG1) was examined by immunohistochemistry, real-time PCR and western blotting.

Results

CAFs increased the self-renewal of GCSCs by secreting NRG1. NRG1 activated NF-κB signaling and this activation regulated GCSC self-renewal. Moreover, NF-κB-active GCSCs were tumorigenic, however NF-κB-inactive GCSCs were not. The overexpression of NRG1 in stromal cells and cancer cells was observed in the tumor tissues of gastric cancer patients and was associated with clinical stage lymph node metastasis and survival in gastric cancer patients. In addition, we also found that NRG1 can regulate the proliferation and invasion of gastric cancer cells.

Conclusions

These results indicate that NRG1, which can be secreted by CAFs or cancer cells, promotes progression of gastric cancer by regulating the self-renewal of GCSCs and its overexpression is associated with a prognosis of gastric cancer.
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Metadata
Title
Overexpression of NRG1 promotes progression of gastric cancer by regulating the self-renewal of cancer stem cells
Authors
Myoung-Eun Han
Hyun-Jung Kim
Dong Hoon Shin
Sun-Hwi Hwang
Chi-Dug Kang
Sae-Ock Oh
Publication date
01-06-2015
Publisher
Springer Japan
Published in
Journal of Gastroenterology / Issue 6/2015
Print ISSN: 0944-1174
Electronic ISSN: 1435-5922
DOI
https://doi.org/10.1007/s00535-014-1008-1

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