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Updated: May 17, 2025

Monitoring Activation of the Antiviral Pattern Recognition Receptors RIG-I And PKR By Limited Protease Digestion and Native PAGE
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Influenza virus antagonizes self sensing by RIG-I to enhance viral replication.

Mitchell P Ledwith1, Thomas Nipper1, Kaitlin A Davis1

  • 1Medical Microbiology and Immunology, University of Wisconsin Madison, Madison, WI, USA.

Biorxiv : the Preprint Server for Biology
|March 31, 2025
PubMed
Summary

Host RNAs activate RIG-I (retinoic acid-inducible gene I) to amplify antiviral defenses during influenza infection. However, the influenza virus nucleoprotein (NP) protein antagonizes this self-sensing mechanism to evade immune responses.

Keywords:
RIG-IRNA polymerase IIIinfluenza virusinnate immunityself sensing

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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Innate immunity relies on sensors to differentiate pathogens from host cells, crucial for preventing autoimmune responses.
  • RIG-I (retinoic acid-inducible gene I) is a key cytoplasmic sensor detecting viral RNA and initiating antiviral states.
  • RNA viruses are significant human pathogens, and understanding their interaction with host immune sensors is vital.

Purpose of the Study:

  • To investigate the role of host RNAs in RIG-I activation and antiviral responses.
  • To elucidate the mechanism by which influenza virus counteracts host RNA-mediated innate immunity.

Main Methods:

  • Biochemical assays to study RNA binding and protein interactions.
  • Cell-based assays to assess RIG-I activation and antiviral responses.
  • Analysis of RNA polymerase III-transcribed non-coding RNAs and their role in innate immunity.

Main Results:

  • RIG-I binds and is activated by host non-coding RNAs, primarily those transcribed by RNA polymerase III, amplifying the antiviral state.
  • These host RNAs become immunogenic during influenza virus infection, signaling through RIG-I to suppress viral replication.
  • Influenza virus nucleoprotein (NP) binds these host RNAs and antagonizes RIG-I sensing, thereby inhibiting innate immune responses.

Conclusions:

  • Host RNA sensing via RIG-I is a critical mechanism for amplifying antiviral immunity.
  • Influenza virus employs NP to disrupt host RNA-mediated RIG-I activation, representing a novel viral evasion strategy.
  • Understanding this interplay is crucial for developing new antiviral therapies targeting innate immune pathways.