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Published in: BMC Cancer 1/2011

Open Access 01-12-2011 | Research article

Transcriptional activation of the Axl and PDGFR-α by c-Met through a ras- and Src-independent mechanism in human bladder cancer

Authors: Chen-Yun Yeh, Shin-Mei Shin, Hsuan-Heng Yeh, Tsung-Jung Wu, Jyh-Wei Shin, Tsuey-Yu Chang, Giri Raghavaraju, Chung-Ta Lee, Jung-Hsien Chiang, Vincent S Tseng, Yuan-Chii G Lee, Cheng-Huang Shen, Nan-Haw Chow, Hsiao-Sheng Liu

Published in: BMC Cancer | Issue 1/2011

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Abstract

Background

A cross-talk between different receptor tyrosine kinases (RTKs) plays an important role in the pathogenesis of human cancers.

Methods

Both NIH-Met5 and T24-Met3 cell lines harboring an inducible human c-Met gene were established. C-Met-related RTKs were screened by RTK microarray analysis. The cross-talk of RTKs was demonstrated by Western blotting and confirmed by small interfering RNA (siRNA) silencing, followed by elucidation of the underlying mechanism. The impact of this cross-talk on biological function was demonstrated by Trans-well migration assay. Finally, the potential clinical importance was examined in a cohort of 65 cases of locally advanced and metastatic bladder cancer patients.

Results

A positive association of Axl or platelet-derived growth factor receptor-alpha (PDGFR-α) with c-Met expression was demonstrated at translational level, and confirmed by specific siRNA knock-down. The transactivation of c-Met on Axl or PDGFR-α in vitro was through a ras- and Src-independent activation of mitogen-activated protein kinase/extracellular signal-regulated kinase (MEK/ERK) pathway. In human bladder cancer, co-expression of these RTKs was associated with poor patient survival (p < 0.05), and overexpression of c-Met/Axl/PDGFR-α or c-Met alone showed the most significant correlation with poor survival (p < 0.01).

Conclusions

In addition to c-Met, the cross-talk with Axl and/or PDGFR-α also contributes to the progression of human bladder cancer. Evaluation of Axl and PDGFR-α expression status may identify a subset of c-Met-positive bladder cancer patients who may require co-targeting therapy.
Appendix
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Metadata
Title
Transcriptional activation of the Axl and PDGFR-α by c-Met through a ras- and Src-independent mechanism in human bladder cancer
Authors
Chen-Yun Yeh
Shin-Mei Shin
Hsuan-Heng Yeh
Tsung-Jung Wu
Jyh-Wei Shin
Tsuey-Yu Chang
Giri Raghavaraju
Chung-Ta Lee
Jung-Hsien Chiang
Vincent S Tseng
Yuan-Chii G Lee
Cheng-Huang Shen
Nan-Haw Chow
Hsiao-Sheng Liu
Publication date
01-12-2011
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2011
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-11-139

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