Oncolytic adenoviral mutants induce a novel mode of programmed cell death in ovarian cancer

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Updated: Jul 9, 2026

Genome-wide RNAi Screening to Identify Host Factors That Modulate Oncolytic Virus Therapy
08:51

Genome-wide RNAi Screening to Identify Host Factors That Modulate Oncolytic Virus Therapy

Published on: April 3, 2018

S K Baird1, J L Aerts, A Eddaoudi

  • 1Centre for Molecular Oncology, Cancer Research UK Clinical Centre, Institute of Cancer, Barts and the London Queen Mary's School of Medicine, London, UK.

Oncogene
|December 12, 2007
PubMed

Insights

Oncolytic adenoviruses with E1A CR2 deletions induce cell death in ovarian cancer through a novel mechanism, distinct from apoptosis or necrosis. The adenovirus death protein (E3 11.6) does not influence this cell death pathway.

Area of Science:

  • Oncology
  • Virology
  • Cell Biology

Background:

  • Oncolytic adenoviruses show promise in ovarian cancer treatment.
  • The precise mechanisms of cell death induced by these viruses are not fully understood.
  • E1A CR2-deleted mutants, like dl922-947, exhibit enhanced potency.

Purpose of the Study:

  • To investigate the mode of cell death induced by E1A CR2-deleted oncolytic adenoviruses in ovarian cancer models.
  • To determine the role of the adenovirus death protein (E3 11.6) in modulating cell death.
  • To explore the involvement of apoptosis, mitochondria, Smac/DIABLO, cathepsins, and autophagy.

Main Methods:

  • Infection of ovarian cancer cells with E1A CR2-deleted adenoviruses (dl922-947, dlCR2, dlCR2 tSmac).
  • Analysis of cell death pathways, including apoptosis, mitochondrial involvement, and lysosomal permeability.
  • Assessment of Smac/DIABLO expression and autophagy induction.

Main Results:

  • Classical apoptosis and mitochondrial pathways are not involved in adenoviral-induced cell death.
  • Smac/DIABLO expression did not increase cytotoxicity or apoptotic features.
  • Autophagy was observed but identified as a survival mechanism, not the mode of death.
  • The presence of E3 11.6 did not alter the mode or extent of cell death.

Conclusions:

  • E1A CR2-deleted oncolytic adenoviruses induce cell death in ovarian cancer via a novel programmed cell death pathway.
  • This mechanism appears independent of classical apoptosis, necrosis, and the adenovirus death protein (E3 11.6).
  • Further research is needed to fully elucidate this unique cell death modality.

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