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PGC-1alpha induces apoptosis in human epithelial ovarian cancer cells through a PPARgamma-dependent pathway

Yan Zhang1, Yi Ba, Chang Liu

  • 1State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, China.

Cell Research
|March 21, 2007
PubMed

Insights

Peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PGC-1alpha) induces apoptosis in ovarian cancer cells. Reduced PGC-1alpha expression correlates with tumor progression, suggesting its role in epithelial ovarian cancer.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Peroxisome proliferator-activated receptor gamma (PPARgamma) coactivator-1 alpha (PGC-1alpha) is a key regulator of metabolic processes.
  • The role of PGC-1alpha in ovarian cancer apoptosis remains largely uncharacterized.

Purpose of the Study:

  • To investigate the role of PGC-1alpha in inducing apoptosis in human epithelial ovarian cancer cells.
  • To explore the relationship between PGC-1alpha expression levels and ovarian tumor progression.

Main Methods:

  • Quantitative RT-PCR to assess PGC-1alpha mRNA levels in normal ovaries and ovarian tumors.
  • Overexpression of PGC-1alpha in the Ho-8910 ovarian cancer cell line.
  • Microarray analysis to identify apoptosis-related genes affected by PGC-1alpha.
  • Mitochondrial functional assays to confirm apoptosis induction.
  • Pharmacological inhibition and siRNA-mediated knockdown of PPARgamma.

Main Results:

  • Lower PGC-1alpha mRNA levels were observed in malignant ovarian tumors compared to normal ovaries.
  • PGC-1alpha overexpression induced apoptosis in Ho-8910 cells, modulating Bcl-2 and Bax expression.
  • Microarray analysis revealed significant alterations in apoptosis-related genes.
  • Apoptosis was mediated by cytochrome c release, indicating involvement of the mitochondrial pathway.
  • PGC-1alpha-induced apoptosis was partially dependent on PPARgamma signaling.

Conclusions:

  • PGC-1alpha plays a significant role in inducing apoptosis in human epithelial ovarian cancer cells.
  • Downregulation of PGC-1alpha may contribute to ovarian cancer growth and progression.
  • PGC-1alpha exerts its pro-apoptotic effects, at least partly, through a PPARgamma-dependent pathway.

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