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Blocking mtDNA replication upregulates the expression of stemness-related genes in prostate cancer cell lines

Yishan Liu1, Xueping Wu, Xiaoran Li

  • 1Department of Urology, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway.

Ultrastructural Pathology
|May 3, 2013
PubMed

Insights

Blocking mitochondrial DNA replication with ethidium bromide (EtBr) increased stemness genes and B7-H3 expression in prostate cancer cells. This suggests a link between mitochondrial function and cancer stem cell phenotypes.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Ethidium bromide (EtBr) is an intercalating agent that inhibits mitochondrial DNA (mtDNA) transcription and replication.
  • Mitochondrial dysfunction is increasingly implicated in cancer progression and stemness.

Purpose of the Study:

  • To investigate the effect of blocking mtDNA replication using EtBr on stemness gene expression and B7-H3 levels in prostate cancer cell lines.
  • To explore the potential association between mitochondrial function and cancer stem cell characteristics.

Main Methods:

  • PC-3 and DU145 prostate cancer cell lines were treated with EtBr (50 and 500 ng/mL) for two weeks.
  • Cell growth was monitored, and expression of stemness genes (ABCG2, Oct3/4, Nanog, CD44) and B7-H3 protein was assessed using flow cytometry and immunocytochemistry.

Main Results:

  • EtBr treatment led to a slight decrease in cell growth during the second week.
  • Increased expression of stemness genes (Oct3/4, Nanog, CD44, ABCG2) was observed in EtBr-treated cells.
  • A dose-dependent increase in B7-H3 protein expression was detected in both cell lines.

Conclusions:

  • Inhibition of mtDNA replication by EtBr upregulates stemness-related genes and the immune regulator B7-H3 in prostate cancer cells.
  • Mitochondrial function may play a role in maintaining cancer stem cell phenotypes.
  • Elevated B7-H3 expression could contribute to cancer cell-mediated immunosuppression.

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