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C-jun activation in acquired cystic kidney disease and renal cell carcinoma

Mototsugu Oya1, Shuji Mikami, Ryuichi Mizuno

  • 1Department of Urology, Keio University School of Medicine, Tokyo, Japan. moto-oya@sc.itc.keio.ac.jp

The Journal of Urology
|July 12, 2005
PubMed
Abstract

Insights

Increased c-Jun activation is linked to early renal cell carcinoma (RCC) development, particularly in atypical hyperplastic cells within acquired cystic kidney disease (ACKD). This suggests c-Jun plays a role in the initial stages of RCC carcinogenesis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Activator protein-1 (AP-1) is crucial for cytokine signal transduction.
  • AP-1 comprises Jun and Fos proto-oncogene families.
  • c-Jun, a component of AP-1, is implicated in cell cycle progression and neoplastic transformation.

Purpose of the Study:

  • To investigate the impact of c-Jun protein activation on pathological parameters in renal cell carcinoma (RCC).
  • To explore the role of c-Jun in the early stages of RCC development.

Main Methods:

  • Immunohistochemistry was used to assess total and phosphorylated c-Jun protein expression.
  • The study included 72 patients with RCC, with a subset of 10 cases arising from acquired cystic kidney disease (ACKD).

Main Results:

  • c-Jun expression was detected in distal tubules; phosphorylated c-Jun was found in atypical hyperplastic cells in ACKD.
  • Increased c-Jun activation was observed in RCC cases, correlating with earlier stages of carcinogenesis (pT1a).
  • Enhanced c-Jun activation was more prevalent in localized, smaller tumors than in more advanced stages.

Conclusions:

  • c-Jun activation is a significant factor in the early carcinogenesis of RCC.
  • Chronic cytokine stimulation activating c-Jun may contribute to aberrant proliferation in ACKD and RCC.

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