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Oncolytic effects of a novel influenza A virus expressing interleukin-15 from the NS reading frame

Marijke van Rikxoort1, Martin Michaelis, Markus Wolschek

  • 1Institut für Medizinische Virologie, Klinikum der Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany.

Plos One
|May 8, 2012
PubMed

Insights

Researchers engineered an oncolytic influenza virus (delNS1-IL-15) that selectively targets tumor cells and stimulates the immune system. This novel virus demonstrates potent anti-cancer activity, enhanced by chemotherapy, offering a promising new cancer therapy.

Area of Science:

  • Oncolytic virology
  • Immunotherapy
  • Cancer research

Background:

  • Oncolytic influenza A viruses with a deleted NS1 gene (delNS1) show selective tumor cell replication.
  • Tumor cells with defective interferon response or activated Ras/Raf/MEK/ERK pathways are targeted.
  • There is a need for oncolytic viruses with enhanced immunostimulatory properties.

Purpose of the Study:

  • To develop a delNS1 virus with specific immunostimulatory properties by inserting the interleukin-15 (IL-15) coding sequence.
  • To evaluate the oncolytic efficacy and immunostimulatory potential of the engineered virus (delNS1-IL-15).
  • To investigate the synergistic effects of delNS1 viruses with cytotoxic drugs and MEK/ERK pathway inhibitors.

Main Methods:

  • Optimized technology was used to insert the IL-15 coding sequence into the NS gene segment of delNS1 virus.
  • Oncolytic effects were assessed in interferon-defective melanoma cells.
  • Virus replication, apoptosis, and IL-15 production were measured.
  • Natural killer (NK) cell-mediated lysis of tumor cells was evaluated.
  • The impact of cisplatin and MEK/ERK pathway inhibition was studied.

Main Results:

  • Both delNS1 and delNS1-IL-15 viruses exhibited similar oncolytic effects and caused caspase-dependent apoptosis in melanoma cells.
  • Virus replication was essential for oncolytic activity.
  • Cisplatin enhanced delNS1 virus replication and apoptosis induction.
  • delNS1-IL-15 infection led to significant IL-15 production in cell culture supernatants.
  • Supernatants from delNS1-IL-15-infected cells induced NK cell-mediated lysis of non-infected tumor cells.

Conclusions:

  • A novel oncolytic influenza virus (delNS1-IL-15) was constructed, combining oncolytic activity with IL-15-mediated immunostimulation.
  • The engineered virus effectively stimulates natural killer cells to lyse tumor cells.
  • The oncolytic activity of delNS1 viruses can be potentiated by combination with cytotoxic anti-cancer drugs.

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