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Updated: Aug 25, 2026

Fluorescence-based Neuraminidase Inhibition Assay to Assess the Susceptibility of Influenza Viruses to The Neuraminidase Inhibitor Class of Antivirals
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MEK inhibition impairs influenza B virus propagation without emergence of resistant variants

Stephan Ludwig1, Thorsten Wolff, Christina Ehrhardt

  • 1Robert-Koch Institut, D-13353 Berlin, Germany. stephan.ludwig@uni-duesseldorf.de

FEBS Letters
|March 12, 2004
PubMed

Insights

Influenza B virus infection relies on the Raf/MEK/ERK pathway for replication. Inhibiting this pathway with U0126 blocks viral spread and nuclear export, with no resistant strains emerging.

Area of Science:

  • Virology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Influenza viruses, particularly types A and B, pose a significant global health risk.
  • Understanding host-pathogen interactions is crucial for developing effective antiviral strategies.

Purpose of the Study:

  • To investigate the role of the Raf/MEK/ERK signaling cascade in influenza B virus replication.
  • To determine if targeting this pathway can inhibit viral propagation and assess the potential for resistance development.

Main Methods:

  • Utilized dominant-negative mutants of Raf and ERK.
  • Employed the MEK inhibitor U0126 to block the Raf/MEK/ERK pathway.
  • Assessed viral propagation and titers in response to pathway modulation.

Main Results:

  • Influenza B virus infection activates the Raf/MEK/ERK cascade, which is essential for efficient virus production.
  • Inhibition of MEK (using U0126) or expression of dominant-negative mutants significantly impaired viral propagation.
  • Selective activation of the pathway led to increased virus titers.
  • MEK inhibition was found to interfere with a specific viral nuclear export process.
  • Crucially, no resistant influenza virus variants emerged when treated with U0126, indicating limited adaptability to this host-directed therapy.

Conclusions:

  • The Raf/MEK/ERK signaling pathway is a critical host factor supporting influenza B virus replication.
  • Targeting this pathway, specifically MEK, represents a promising antiviral strategy with a low risk of resistance.
  • This host-directed approach highlights the potential for developing novel therapeutics against influenza viruses.

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