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Collaboration of RON and epidermal growth factor receptor in human bladder carcinogenesis

Pei-Yin Hsu1, Hsiao-Sheng Liu, Hong-Lin Cheng

  • 1Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan, Republic of China.

The Journal of Urology
|October 31, 2006
PubMed
Abstract

Insights

Epidermal growth factor receptor (EGFR) and RON receptor tyrosine kinase collaborate in bladder cancer progression. Inhibiting EGFR blocks RON-driven tumor growth, invasion, and recurrence, suggesting combined targeting for improved patient survival.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Receptor tyrosine kinases (RTKs) play crucial roles in cancer development.
  • RON, a specific RTK, is implicated in human bladder carcinogenesis.
  • Cross-talk between RTKs, like EGFR and RON, is a key mechanism in tumor progression.

Purpose of the Study:

  • To investigate the significance of epidermal growth factor receptor (EGFR) in modulating RON-associated bladder tumorigenesis.
  • To elucidate the biological impact of the collaboration between RON and EGFR in bladder cancer.
  • To assess the clinical relevance of RON and EGFR co-expression in a bladder cancer patient cohort.

Main Methods:

  • Examined RON-EGFR interaction in bladder cancer cell lines (TSGH8301, J82, JR) using immunoprecipitation and immunoblotting.
  • Assessed cell migration via time-lapse wound healing and Transwell assays.
  • Analyzed cell transformation using foci formation assays.
  • Investigated clinical significance through immunohistochemistry in a cohort of 78 bladder cancer patients.

Main Results:

  • EGFR directly associates with RON, independent of ligand stimulation.
  • EGFR inhibition (siRNA or kinase inhibitors) suppressed RON-driven mitogenesis, migration, anti-apoptosis, and neoplastic transformation.
  • Co-expression of RON and EGFR was observed in 33.3% of patients (26/78).
  • RON/EGFR co-expression correlated significantly with tumor invasion, local recurrence risk, and decreased patient survival.
  • Combined RON/EGFR expression and tumor staging were critical indicators of patient survival.

Conclusions:

  • A functional cross-talk exists between EGFR and RON in bladder cancer in vivo.
  • The EGFR-RON axis represents a potential therapeutic target for bladder cancer.
  • Considering this interaction in treatment planning may improve outcomes for bladder cancer patients.

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