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Induction and Analysis of Epithelial to Mesenchymal Transition
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Benzidine induces epithelial-mesenchymal transition in human uroepithelial cells through ERK1/2 pathway.

Li Zhao1, Hao Geng1, Zhao-Feng Liang2

  • 1Department of Urology, The Second Affiliated Hospital of Anhui Medical University, Hefei 230032, China.

Biochemical and Biophysical Research Communications
|March 12, 2015
PubMed
Summary

Prolonged benzidine exposure causes urothelial carcinoma (UC) by triggering epithelial-to-mesenchymal transition (EMT). This study reveals that the ERK1/2 pathway is key in benzidine-induced EMT, offering potential therapeutic targets for bladder cancer.

Keywords:
BenzidineERK1/2 pathwayEpithelial–mesenchymal transitionSV-HUC-1 cells

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Area of Science:

  • Oncology
  • Cell Biology
  • Toxicology

Background:

  • Prolonged benzidine exposure is a known risk factor for urothelial carcinoma (UC).
  • Benzidine-induced epithelial-to-mesenchymal transition (EMT) is implicated in cancer progression.
  • The specific role of ERK1/2 in benzidine-induced EMT remains unelucidated.

Purpose of the Study:

  • To investigate the regulatory role of the ERK1/2 pathway in benzidine-induced EMT in human uroepithelial cells.
  • To elucidate the molecular mechanisms underlying benzidine's role in bladder cancer development.

Main Methods:

  • SV-HUC-1 cells were subjected to benzidine exposure.
  • Wound healing and transwell assays assessed cell invasion.
  • Western blotting and immunofluorescence analyzed protein expression (EMT markers, MAPK pathway components).
  • MAPK pathway inhibitors (U0126, SB203580, SP600125) were used to determine pathway involvement.

Main Results:

  • Benzidine exposure significantly increased SV-HUC-1 cell invasion.
  • Benzidine upregulated EMT markers (Snail, β-catenin, Vimentin, MMP-2) and downregulated E-cadherin and ZO-1.
  • Phosphorylation of ERK1/2, p38, JNK, and AP-1 was enhanced by benzidine.
  • Only the ERK inhibitor (U0126) reversed benzidine-induced EMT marker expression.

Conclusions:

  • Benzidine induces epithelial-to-mesenchymal transition (EMT) in human uroepithelial cells primarily through the ERK1/2 pathway.
  • This study identifies the ERK1/2 pathway as a critical mediator of benzidine's pro-malignant effects.
  • Findings provide insights into molecular mechanisms of benzidine-induced bladder cancer and potential therapeutic targets.