Overexpression of epidermal growth factor receptor in urothelium elicits urothelial hyperplasia and promotes bladder tumor growth

Jin Cheng, Hongying Huang, Zhong Ting Zhang, Ellen Shapiro, Angel Pellicer, Tung Tien Sun, Xue Ru Wu

Research output: Contribution to journalArticle

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Abstract

Although urothelium is constantly bathed in high concentrations of epidermal growth factor (EGF) and most urothelial carcinomas overexpress EGF receptor (EGFr), relatively little is known about the role of EGFr signaling pathway in urothelial growth and transformation. In the present study, we used the uroplakin II gene promoter to drive the urothelial overexpression of EGFr in transgenic mice. Three transgenic lines were established, all expressing a higher level of the EGFr mRNA and protein in the urothelium than the nontransgenic controls. The overexpressed EGFr was functionally active because it was autophosphorylated, and its downstream mitogen-activated protein kinases were highly activated. Phenotypically, the urinary bladders of all transgenic lines developed simple urothelial hyperplasia that was strongly positive for proliferative cell nuclear antigen and weakly positive for bromodeoxyuridine incorporation. When coexpressed with the activated Ha-ras oncogene in double transgenic mice, EGFr had no apparent tumor-enhancing effects over the urothelial hyperplastic phenotype induced by Ha-ras oncogene. However, when coexpressed with the SV40 large T antigen, EGFr accelerated tumor growth and converted the carcinoma in situ of the SV40T mice into high-grade bladder carcinomas, without triggering tumor invasion. Our studies indicate that urothelial overexpression of EGFr can induce urothelial proliferation but not frank carcinoma formation. Our results also suggest that, whereas EGFr and Ha-ras, both of which act in the same signal transduction cascade, stimulated urothelial hyperplasia, they were not synergistic in urothelial tumorigenesis, and EGFr overexpression can cooperate with p53 and pRB dysfunction (as occurring in SV40T transgenic mice) to promote bladder tumor growth.

Original languageEnglish (US)
Pages (from-to)4157-4163
Number of pages7
JournalCancer Research
Volume62
Issue number14
StatePublished - Jul 15 2002
Externally publishedYes

Fingerprint

Urothelium
Epidermal Growth Factor Receptor
Urinary Bladder Neoplasms
Hyperplasia
Growth
Transgenic Mice
ras Genes
Carcinoma
Uroplakin II
Urinary Bladder
Polyomavirus Transforming Antigens
Neoplasms
Nuclear Antigens
Viral Tumor Antigens
Carcinoma in Situ
Bromodeoxyuridine
Mitogen-Activated Protein Kinases
Epidermal Growth Factor
Signal Transduction
Carcinogenesis

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

Cite this

Cheng, J., Huang, H., Zhang, Z. T., Shapiro, E., Pellicer, A., Sun, T. T., & Wu, X. R. (2002). Overexpression of epidermal growth factor receptor in urothelium elicits urothelial hyperplasia and promotes bladder tumor growth. Cancer Research, 62(14), 4157-4163.

Overexpression of epidermal growth factor receptor in urothelium elicits urothelial hyperplasia and promotes bladder tumor growth. / Cheng, Jin; Huang, Hongying; Zhang, Zhong Ting; Shapiro, Ellen; Pellicer, Angel; Sun, Tung Tien; Wu, Xue Ru.

In: Cancer Research, Vol. 62, No. 14, 15.07.2002, p. 4157-4163.

Research output: Contribution to journalArticle

Cheng, J, Huang, H, Zhang, ZT, Shapiro, E, Pellicer, A, Sun, TT & Wu, XR 2002, 'Overexpression of epidermal growth factor receptor in urothelium elicits urothelial hyperplasia and promotes bladder tumor growth', Cancer Research, vol. 62, no. 14, pp. 4157-4163.
Cheng J, Huang H, Zhang ZT, Shapiro E, Pellicer A, Sun TT et al. Overexpression of epidermal growth factor receptor in urothelium elicits urothelial hyperplasia and promotes bladder tumor growth. Cancer Research. 2002 Jul 15;62(14):4157-4163.
Cheng, Jin ; Huang, Hongying ; Zhang, Zhong Ting ; Shapiro, Ellen ; Pellicer, Angel ; Sun, Tung Tien ; Wu, Xue Ru. / Overexpression of epidermal growth factor receptor in urothelium elicits urothelial hyperplasia and promotes bladder tumor growth. In: Cancer Research. 2002 ; Vol. 62, No. 14. pp. 4157-4163.
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