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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
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Published on: March 2, 2014

Dual Role of p53 in Innate Antiviral Immunity

Carmen Rivas1, Stuart A Aaronson2, Cesar Munoz-Fontela2

  • 1Centro Nacional de Biotecnologia, CSIC, Darwin 3, Campus Universidad Autónoma, Madrid 28049, Spain.

Viruses
|October 14, 2011
PubMed

Insights

Tumor suppressor p53, known as the guardian of the genome, actively fights viral infections. It induces apoptosis and enhances the type I interferon response, crucial for innate immunity against viruses.

Area of Science:

  • Immunology
  • Molecular Biology
  • Virology

Background:

  • The tumor suppressor p53, or 'guardian of the genome,' prevents cancer by inducing cell cycle arrest and apoptosis.
  • Type I interferons (IFNs) activate p53 during viral infections, contributing to apoptosis and limiting viral replication.
  • Recent findings reveal that p53 directly regulates several IFN-inducible genes, including IRF9, IRF5, ISG15, and TLR3.

Purpose of the Study:

  • To elucidate the role of tumor suppressor p53 in antiviral innate immunity.
  • To investigate the interplay between p53 and the type I interferon response during viral infections.
  • To explore the implications of p53's function in antiviral immunity for viral evolution.

Main Methods:

  • Literature review of recent studies on p53, type I IFNs, and viral infections.
  • Analysis of gene expression data related to p53 and IFN-inducible genes.
  • Bioinformatic analysis to identify direct transcriptional targets of p53.

Main Results:

  • p53 is activated by type I IFNs upon viral infection and contributes to virus-induced apoptosis.
  • Several key IFN-inducible genes (IRF9, IRF5, ISG15, TLR3) are identified as direct transcriptional targets of p53.
  • These findings highlight a dual role for p53 in antiviral defense: inducing apoptosis and reinforcing the type I IFN response.

Conclusions:

  • p53 plays a critical role in antiviral innate immunity, acting as a crucial link between viral detection and the interferon response.
  • The regulation of IFN-inducible genes by p53 enhances the host's ability to combat viral infections.
  • This understanding provides new insights into why viruses have evolved mechanisms to antagonize p53.
Keywords:
apoptosisimmunityinterferonp53

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