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Necroptosis restricts influenza A virus as a stand-alone cell death mechanism

Maria Shubina1, Bart Tummers2, David F Boyd2

  • 1Blood Cell Development and Function Program, Fox Chase Cancer Center, Philadelphia, PA.

The Journal of Experimental Medicine
|August 16, 2020
PubMed

Insights

Necroptosis, a cell death pathway, fully compensates for apoptosis in controlling Influenza A virus infection. This independent pathway drives immune responses and virus clearance when apoptosis is absent, highlighting its critical role in antiviral defense.

Area of Science:

  • Immunology
  • Cell Biology
  • Virology

Background:

  • Influenza A virus (IAV) infection triggers Z-DNA binding protein 1 (ZBP1)-initiated RIPK3-dependent necroptosis and apoptosis pathways.
  • While apoptosis alone can limit IAV, the role of necroptosis in viral restriction, especially without apoptosis, remains unclear.

Purpose of the Study:

  • To investigate the role of necroptosis in antiviral defense against IAV in the absence of apoptosis.
  • To determine if necroptosis can act as a standalone antiviral mechanism.

Main Methods:

  • Utilized mice selectively deficient in IAV-activated apoptosis.
  • Assessed immune responses and viral clearance in infected lungs.

Main Results:

  • Necroptosis drives robust antiviral immune responses when apoptosis is absent.
  • Necroptosis effectively promotes viral clearance from infected lungs in the absence of apoptosis.
  • Apoptosis and necroptosis are mutually exclusive cell death fates in IAV-infected cells.

Conclusions:

  • Necroptosis functions as an independent, standalone cell death mechanism in antiviral host defense.
  • Necroptosis fully compensates for the absence of apoptosis in controlling IAV infection.

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