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Vaccinia virus induces programmed necrosis in ovarian cancer cells

Lynsey M Whilding1, Kyra M Archibald, Hagen Kulbe

  • 1Centre for Molecular Oncology, Barts Cancer Institute, Queen Mary University of London, London, UK.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|August 30, 2013
PubMed

Insights

Oncolytic vaccinia virus induces ovarian cancer cell death via programmed necrosis, not apoptosis or autophagy. This regulated cell death involves specific protein complexes and metabolic changes, offering new therapeutic insights.

Area of Science:

  • Oncology
  • Virology
  • Cell Biology

Background:

  • The precise mechanisms of oncolytic vaccinia virus-mediated tumor cell death remain unclear.
  • Understanding these pathways is crucial for optimizing oncolytic virotherapy efficacy.

Purpose of the Study:

  • To investigate the specific cell death pathways induced by vaccinia virus in ovarian cancer cells.
  • To differentiate between apoptosis, autophagy, and other cell death modalities.

Main Methods:

  • Infection of ovarian cancer cells with wild-type and dTK Lister strain vaccinia virus.
  • Analysis of cell death markers, including phosphatidylserine externalization, DNA content, LC3 lipidation, and transmission electron microscopy.
  • Assessment of intracellular ATP levels, mitochondrial metabolism, HMGB1 release, and protein complex formation (RIP1/caspase-8).
  • Pharmacological inhibition studies targeting RIP1, MLKL, and TNF-α signaling.

Main Results:

  • Vaccinia virus infection induced necrotic cell death, not classical apoptosis, despite some apoptotic features.
  • Autophagy was not generally activated, and cell death did not depend on autophagy induction.
  • Necrosis was characterized by reduced ATP, altered mitochondrial metabolism, HMGB1 release, and formation of a RIP1/caspase-8 complex.
  • Inhibition of RIP1 and MLKL significantly reduced cell death, while TNF-α blockade had no effect.

Conclusions:

  • Vaccinia virus induces programmed necrotic cell death in ovarian cancer cells.
  • This process is mediated by specific molecular players like RIP1 and does not rely on apoptosis or autophagy.
  • Findings provide insights into the regulated nature of oncolytic virus-induced cell death.

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