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The VHL-dependent regulation of microRNAs in renal cancer

Calida S Neal1, Michael Z Michael, Lesley H Rawlings

  • 1Renal Unit, School of Medicine, Flinders University, Flinders Medical Centre, Adelaide, Australia.

BMC Medicine
|October 23, 2010
PubMed
Abstract

Insights

Von Hippel-Lindau (VHL) tumor suppressor gene inactivation in clear cell renal cell carcinoma (cc RCC) affects microRNA (miRNA) expression. Increased miR-210 levels correlate with poor patient survival, suggesting a role in tumor progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Clear cell renal cell carcinoma (cc RCC) is the most common kidney cancer.
  • VHL gene mutations lead to hypoxia-inducible factors (HIFs) and altered gene expression.
  • MicroRNAs (miRNAs) show differential expression in tumors.

Purpose of the Study:

  • To investigate VHL-dependent regulation of miRNAs in cc RCC.
  • To identify specific miRNAs involved in cc RCC pathogenesis.

Main Methods:

  • Microarray analysis of cc RCC cell lines with and without VHL.
  • Quantitative PCR for selected miRNAs (miR-210, miR-155, miR-21).
  • Correlation analysis with HIF-regulated genes and patient survival in 31 cc RCC tumors.

Main Results:

  • VHL-regulated miRNAs were identified.
  • miR-210, miR-155, and miR-21 were significantly upregulated in cc RCC tumors.
  • Increased miR-210 expression correlated with HIF activity, VHL status, and reduced patient survival.

Conclusions:

  • VHL influences miRNA expression through both HIF-dependent and independent pathways.
  • miR-210 is upregulated in cc RCC and linked to poorer survival.
  • miR-210 may target ISCU1/2, contributing to anaerobic respiration in tumors.

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