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Novel ZEB1 expression in bladder tumorigenesis.

Patrick A Kenney1, Matthew F Wszolek, Kimberly M Rieger-Christ

  • 1Department of Urology, Lahey Clinic, Burlington, MA, USA.

BJU International
|August 26, 2010
PubMed
Summary

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ZEB1 is newly identified in bladder tumors, promoting cancer cell migration and invasion in lab studies. Its expression correlates with microRNA changes linked to tumor progression but not clinical outcomes.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Epithelial-mesenchymal transition (EMT) drives tumor progression, with ZEB1 identified as a key regulator implicated in various cancers.
  • ZEB1's role in bladder cancer and its association with microRNAs (miRNAs) require further investigation.

Purpose of the Study:

  • To investigate ZEB1 expression in bladder tumorigenesis.
  • To determine the functional role of ZEB1 in urothelial carcinomas of the bladder (UCBs).

Main Methods:

  • Immunohistochemistry was used to assess nuclear ZEB1 expression in 558 bladder tumor samples (non-muscle-invasive and muscle-invasive).
  • ZEB1 expression was modulated in bladder cancer cell lines (CUBIII, UM-UC-3) via forced expression or shRNA knockdown.
  • Western blot and in vitro migration/invasion assays were performed to evaluate functional consequences.

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Main Results:

  • ZEB1 was expressed in 22.8% of non-muscle-invasive and 21.7% of muscle-invasive UCBs, but not in normal bladder mucosa.
  • ZEB1 expression levels did not correlate with tumor stage, grade, nodal involvement, metastasis, or survival.
  • Modulating ZEB1 in cell lines enhanced or reduced migration and invasion, respectively, accompanied by altered miRNA expression.

Conclusions:

  • ZEB1 is expressed in bladder cancer, influencing cell migration and invasion in vitro.
  • ZEB1 modulation is linked to changes in the miR-200 family, suggesting a role in bladder tumor progression.
  • ZEB1's expression in bladder cancer does not appear directly linked to clinical variables like metastasis or survival.