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Updated: Aug 7, 2026

Assessment of Mitochondrial Functions and Cell Viability in Renal Cells Overexpressing Protein Kinase C Isozymes
15:43

Assessment of Mitochondrial Functions and Cell Viability in Renal Cells Overexpressing Protein Kinase C Isozymes

Published on: January 7, 2013

Decreased expression of the pro-apoptotic protein Par-4 in renal cell carcinoma

J Cook1, S Krishnan, S Ananth

  • 1Department of Surgery, University of Kentucky, Lexington 40536, USA.

Oncogene
|February 18, 1999
PubMed

Insights

Prostate apoptosis-related gene 4 (Par-4) protein levels are significantly decreased in renal cell carcinoma, contributing to cancer progression. Restoring Par-4 sensitizes cancer cells to apoptosis, suggesting therapeutic potential.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Death Research

Background:

  • Prostate apoptosis-related gene 4 (Par-4) is a leucine zipper protein crucial for apoptosis induction.
  • Down-regulation of apoptosis-promoting genes is observed during tumorigenesis.
  • The role of Par-4 in renal cell carcinoma (RCC) pathophysiology is not well understood.

Purpose of the Study:

  • To investigate the expression levels of Par-4 in human renal cell carcinoma.
  • To determine the functional significance of Par-4 in RCC cell lines.
  • To explore the potential of Par-4 as a therapeutic target in RCC.

Main Methods:

  • Western blot analysis to quantify Par-4 protein levels in tumor and normal kidney tissues.
  • Immunohistochemistry to assess Par-4 expression patterns.
  • Transfection of RCC cell lines with Par-4 to restore protein levels.
  • Apoptosis assays (e.g., caspase activation, DNA fragmentation) to evaluate cell death sensitivity.

Main Results:

  • Par-4 protein levels were markedly reduced in human renal cell carcinoma specimens compared to adjacent normal tubular cells.
  • Restoration of Par-4 expression in RCC cell lines re-sensitized them to apoptosis induced by various stimuli.
  • Decreased Par-4 expression correlated with features of malignant transformation.

Conclusions:

  • Reduced expression of Par-4 is a common feature in renal cell carcinoma.
  • Par-4 plays a critical role in mediating apoptosis in kidney cancer cells.
  • Re-establishing Par-4 levels may represent a viable strategy to enhance apoptosis and combat renal cell carcinoma progression.

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