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Molecular Cancer
Published in: Molecular Cancer 1/2012

Open Access 01-12-2012 | Research

IL-1β promotes stemness and invasiveness of colon cancer cells through Zeb1 activation

Authors: Yijing Li, Lei Wang, Loretta Pappan, Amy Galliher-Beckley, Jishu Shi

Published in: Molecular Cancer | Issue 1/2012

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Abstract

Background

IL-1β is a pleiotropic pro-inflammatory cytokine and its up-regulation is closely associated with various cancers including gastrointestinal tumors. However, it remains unclear how IL-1β may contribute to the initiation and development of these inflammation-associated cancers. Here we investigated the role of IL-1β in colon cancer stem cell (CSC) development.

Methods

Using self-renewal assay, soft-agar assay, invasion assay, real-time PCR analysis, immunoblot assay and shRNA knockdown, we determined the effects of IL-1β on cancer stem cell development and epithelial-mesenchymal transition (EMT) in human primary colon cancer cells and colon cancer cell line HCT-116.

Results

We found that IL-1β can increase sphere-forming capability of colon cancer cells in serum-free medium. IL-1β-induced spheres displayed an up-regulation of stemness factor genes (Bmi1 and Nestin) and increased drug resistance, hallmarks of CSCs. Importantly, expression of EMT activator Zeb1 was increased in IL-1β-induced spheres, indicating that there might be a close association between EMT and IL-1β-induced CSC self-renewal. Indeed, IL-1β treatment led to EMT of colon cancer cells with loss of E-cadherin, up-regulation of Zeb1, and gain of the mesenchymal phenotype. Furthermore, shRNA-mediated knockdown of Zeb1 in HCT-116 cells reversed IL-1β-induced EMT and stem cell formation.

Conclusion

Our findings indicate that IL-1β may promote colon tumor growth and invasion through activation of CSC self-renewal and EMT, and Zeb1 plays a critical role in these two processes. Thus, IL-1β and Zeb1 might be new therapeutic targets against colon cancer stem cells.
Appendix
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Metadata
Title
IL-1β promotes stemness and invasiveness of colon cancer cells through Zeb1 activation
Authors
Yijing Li
Lei Wang
Loretta Pappan
Amy Galliher-Beckley
Jishu Shi
Publication date
01-12-2012
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2012
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-11-87

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