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Assessment of Mitochondrial Functions and Cell Viability in Renal Cells Overexpressing Protein Kinase C Isozymes
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Atypical protein kinase C zeta exhibits a proapoptotic function in ovarian cancer

Irina Nazarenko1, Marcel Jenny, Jana Keil

  • 1Karlsruhe Institute of Technology, Institute of Toxicology and Genetics, Hermann von Helmholtz Platz 1, Eggenstein-Leopoldshafen, Germany. irina.nazarenko@kit.edu

Molecular Cancer Research : MCR
|May 27, 2010
PubMed

Insights

Protein Kinase C zeta (PKCzeta) promotes ovarian cancer cell survival. Its inhibition by PP2A or HRSL3 leads to apoptosis, suggesting PKCzeta as a therapeutic target for ovarian carcinoma.

Area of Science:

  • Cellular signaling pathways
  • Molecular mechanisms of cancer

Background:

  • Protein Kinase C (PKC) family regulates cell proliferation, motility, and survival.
  • Ovarian carcinoma is a significant health concern, necessitating research into its underlying molecular mechanisms.

Purpose of the Study:

  • Investigate the role of specific PKC isoenzymes in apoptosis induction in ovarian carcinoma cells.
  • Determine the relationship between PKC isoenzymes, protein phosphatase 2A (PP2A), and HRSL3 tumor suppressor in cell death pathways.

Main Methods:

  • Measured phosphorylation and activity of PKC isoenzymes in OVCAR-3 cells under various conditions (PP2A/PI3K inhibition, HRSL3 overexpression).
  • Utilized isoform-specific peptide inhibitors and overexpression techniques to assess PKCzeta's role in apoptosis.
  • Analyzed PKCzeta expression levels in human ovarian carcinoma tissues and primary patient cells.

Main Results:

  • PKC epsilon, zeta, and iota were regulated by PP2A and/or HRSL3, unlike PKCalpha and beta.
  • PKCzeta was identified as a key mediator in PP2A- and HRSL3-dependent apoptosis, indicating a proapoptotic function.
  • High PKCzeta expression in ovarian carcinomas correlated with poor prognosis, and patient cells showed increased PKCzeta phosphorylation and apoptosis upon okadaic acid treatment.

Conclusions:

  • PKCzeta plays a crucial role in the survival of ovarian carcinoma cells.
  • Targeting PKCzeta or understanding its regulation by upstream pathways may offer novel therapeutic strategies for ovarian cancer.
  • Upregulation of tyrosine kinase receptors in ovarian tumors might impact apoptosis via negative regulation of PKCzeta.

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