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Involvement of Noxa in mediating cellular ER stress responses to lytic virus infection

Shaun Rosebeck1, Kuladeep Sudini, Tiannan Chen

  • 1Department of Biological Sciences, University of Toledo, Toledo, OH 43606, USA.

Virology
|July 12, 2011
PubMed

Insights

Noxa protein is crucial for cellular defense against viral infections by triggering apoptosis. Endoplasmic reticulum stress amplifies Noxa expression, enhancing the cell

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Immunology

Background:

  • Noxa is a pro-apoptotic mitochondrial protein.
  • Noxa expression is upregulated by viral infections and endoplasmic reticulum (ER) stress.

Purpose of the Study:

  • To investigate the role of Noxa in cellular response to viral infections.
  • To elucidate the mechanisms by which ER stress influences Noxa expression and viral cytopathic effects.

Main Methods:

  • Utilized Noxa null baby mouse kidney (BMK) cells.
  • Assessed viral cytopathic effects and apoptosis.
  • Examined the synergistic effects of interferon (IFN), double-stranded RNA (dsRNA), and ER stress inducers on Noxa expression.

Main Results:

  • Noxa null BMK cells showed impaired cytopathic response to viruses.
  • Reconstitution with wild-type Noxa restored normal viral responses.
  • ER stress inducers and salubrinal affected viral cytopathic effects.
  • Synergistic upregulation of Noxa by IFN/dsRNA and ER stress inducers promoted apoptosis via Mcl-1 degradation and caspase activation.

Conclusions:

  • Noxa plays a vital role in the cellular defense against lytic viruses.
  • ER stress significantly augments Noxa expression during viral infections, enhancing apoptosis.
  • Targeting the ER stress-Noxa pathway may offer therapeutic strategies against viral infections.

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