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Journal of Cancer Research and Clinical Oncology

Published in:

01-04-2014 | Original Paper

High expression of Toll-like receptor 5 correlates with better prognosis in non-small-cell lung cancer: an anti-tumor effect of TLR5 signaling in non-small cell lung cancer

Authors: Hui Zhou, Jian-hua Chen, Jun Hu, Yong-zhong Luo, Fang Li, Ling Xiao, Mei-zuo Zhong

Published in: Journal of Cancer Research and Clinical Oncology | Issue 4/2014

Abstract

Purpose

Toll-like receptor 5 (TLR5) is a pattern recognition receptor and plays key roles in inflammatory responses against pathogen infection. Recent evidence suggests that TLR5 is expressed in a wide variety of tumors and exhibits either pro-tumor or anti-tumor activities. In this study, we explored expression of TLR5 in the context of non-small-cell lung cancer (NSCLC) and evaluated the effects of TLR5 signaling in NSCLC cells.

Methods

The lung carcinoma samples were collected from 113 patients diagnosed as NSCLC at Tumor Hospital of Xiangya School of Medicine from January 2005 to December 2008. Immunohistochemistry was performed for TLR5 and the protein expression score was quantified using an established scoring system. Kaplan–Meier survival curves were generated for disease-free survival (DFS) and overall survival (OS) in all patients. TLR5 expression levels were correlated with DFS and OS using univariate and multivariate Cox regression analysis. Expression and subcellular localization of TLR5 were analyzed in NSCLC cell lines including SPC-A1, A549, H1975, and H1299 cells. Activation of TLR5 signaling pathway by flagellin was characterized by western blotting. Effects of flagellin on NSCLC cell proliferation, anchorage-independent growth, migration, and invasion were analyzed by BrdU incorporation assay, soft agar colony formation assay, wound-healing migration assay, and transwell invasion assay, respectively.

Results

High expression of TLR5 was significantly associated with better prognosis in patients with NSCLC. We further demonstrated that activation of TLR5 by flagellin in NSCLC cells inhibited cell proliferation, migration, and invasion in vitro.

Conclusion

TLR5 may serve as a potential therapeutic target in NSCLC patients.

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Title: High expression of Toll-like receptor 5 correlates with better prognosis in non-small-cell lung cancer: an anti-tumor effect of TLR5 signaling in non-small cell lung cancer
Authors: Hui Zhou
Jian-hua Chen
Jun Hu
Yong-zhong Luo
Fang Li
Ling Xiao
Mei-zuo Zhong
Publication date: 01-04-2014
Publisher: Springer Berlin Heidelberg
Published in: Journal of Cancer Research and Clinical Oncology / Issue 4/2014
Print ISSN: 0171-5216
Electronic ISSN: 1432-1335
DOI: https://doi.org/10.1007/s00432-014-1616-4

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Abstract

Purpose

Methods

Results

Conclusion

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