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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

Decrease of mitochondrial DNA content and energy metabolism in renal cell carcinoma

David Meierhofer1, Johannes A Mayr, Ulrike Foetschl

  • 1Department of Pediatrics, Paracelsus Private Medical University Salzburg, Muellner Hauptstr. 48, A-5020 Salzburg, Austria.

Carcinogenesis
|February 7, 2004
PubMed

Insights

Most renal carcinomas show reduced mitochondrial energy metabolism and mitochondrial DNA content early in formation. This down-regulation is consistent across different renal cancer types and does not change with disease progression.

Area of Science:

  • Oncology
  • Mitochondrial Biology
  • Biochemistry

Background:

  • Mitochondrial dysfunction is implicated in various cancers.
  • The role of mitochondrial energy metabolism in renal neoplasms requires further elucidation.

Purpose of the Study:

  • To investigate the relationship between tumor genesis and mitochondrial energy metabolism in renal carcinomas.
  • To assess specific enzyme activities of oxidative phosphorylation and the Krebs cycle, alongside mitochondrial DNA content.

Main Methods:

  • Analysis of three oxidative phosphorylation enzyme activities, two Krebs cycle components, and mitochondrial DNA content.
  • Comparison of 37 renal carcinoma tissues (conventional, papillary, sarcomatoid, collecting duct) with control kidney tissue.
  • Correlation analysis with tumor grade, metastasis, ploidy, and Ki-67 proliferative activity.

Main Results:

  • A significant reduction in all studied mitochondrial enzyme activities (including complex V) and mitochondrial DNA content was observed in 34 out of 37 renal carcinoma tissues.
  • No statistically significant differences in these parameters were found between conventional, papillary, and sarcomatoid renal carcinoma subtypes.
  • Mitochondrial alterations did not correlate with tumor grade, metastasis, ploidy, or proliferative activity.

Conclusions:

  • A coordinated down-regulation of mitochondrial energy metabolism components occurs early in the formation of most renal carcinomas.
  • This metabolic shift is a consistent feature across different renal carcinoma subtypes and remains stable throughout disease progression.

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