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Multinucleation regulated by the Akt/PTEN signaling pathway is a survival strategy for HepG2 cells

Ananda Mukherjee1, Sandip Misra, Niall G Howlett

  • 1Department of Life Science and Biotechnology, Jadavpur University, 188, Raja S.C. Mullick Road, Kolkata 700032, West Bengal, India.

Mutation Research
|June 26, 2013
PubMed

Insights

Hepatocellular carcinoma (HCC) cells exhibit etoposide resistance through the Akt/PTEN pathway, showing increased DNA damage and multinucleation. This pathway is crucial for HCC cell survival against chemotherapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Hepatocellular carcinoma (HCC) is a primary liver cancer.
  • HCC often shows resistance to conventional chemotherapeutic agents like etoposide.
  • Understanding HCC survival mechanisms is critical for developing effective treatments.

Purpose of the Study:

  • To investigate the survival strategies of HCC cell line HepG2 following etoposide treatment.
  • To compare etoposide-induced DNA damage and cellular responses in HCC (HepG2) and non-cancerous liver (Chang Liver) cell lines.
  • To elucidate the molecular mechanisms underlying etoposide resistance in HCC.

Main Methods:

  • Cytokinesis-block micronucleus assay to assess DNA damage and nuclear division.
  • Etoposide treatment of HepG2 and Chang Liver cell lines.
  • Analysis of the Akt/PTEN signaling pathway, including the use of phosphatidylinositol-3-kinase inhibitors and manipulation of Akt and PTEN expression.

Main Results:

  • HepG2 cells displayed significantly higher micronucleation and nuclear division index post-etoposide exposure compared to Chang Liver cells.
  • HepG2 cells demonstrated greater resistance to etoposide-induced cytotoxicity.
  • Etoposide-induced multinucleation in HepG2 cells was dependent on Akt catalytic activity and reversed by PI3K inhibitors or kinase-defective Akt.
  • Wild type PTEN expression reduced multinucleation and restored etoposide sensitivity in HepG2 cells.

Conclusions:

  • The Akt/PTEN signaling axis plays a pivotal role in determining etoposide resistance in HCC cells.
  • Targeting the Akt/PTEN pathway may represent a therapeutic strategy to overcome etoposide resistance in HCC.
  • Further research into the Akt/PTEN pathway could lead to novel treatments for hepatocellular carcinoma.
Keywords:
AktChang LiverCytokinesis-block micronucleus assayHepG2MultinucleationPTEN

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