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Ribavirin enhances interferon signaling via stimulation of mTOR and p53 activities

Wen-Cheng Su1, Wei-Liang Liu, Ching-Wei Cheng

  • 1Graduate Institute of Molecular Medicine, College of Medicine and Hospital, National Taiwan University, Taipei, Taiwan.

FEBS Letters
|July 22, 2009
PubMed

Insights

Ribavirin enhances interferon signaling by activating p53 through mTOR. This discovery sheds light on ribavirin's antiviral and antitumor mechanisms.

Area of Science:

  • Immunology
  • Molecular Biology
  • Pharmacology

Background:

  • Interferon (IFN) signaling is crucial for antiviral and antitumor responses.
  • The precise mechanisms by which ribavirin enhances IFN signaling are not fully understood.
  • Ribavirin is an established antiviral drug with known immunomodulatory effects.

Purpose of the Study:

  • To elucidate the cellular mechanisms underlying ribavirin's enhancement of interferon signaling.
  • To investigate the potential role of p53 and mTOR pathways in ribavirin's action.
  • To explore how ribavirin affects the interplay between p53, mTOR, and IFN signaling.

Main Methods:

  • Cellular assays to measure p53 and mTOR activation.
  • Western blotting to assess protein-protein interactions (mTOR and p53).
  • Quantitative PCR to analyze IFN regulatory factor 9 (IRF9) transcription.
  • Interferon signaling pathway analysis in response to ribavirin and IFN-alpha treatment.

Main Results:

  • Ribavirin was found to activate p53 by stimulating the mammalian target of rapamycin (mTOR) pathway.
  • Ribavirin promotes the interaction between mTOR and p53.
  • Activated p53, stimulated by ribavirin via mTOR, enhances the transcription of IFN regulatory factor 9 (IRF9).
  • This leads to a subsequent enhancement of interferon signaling.
  • Ribavirin-induced activation of mTOR and p53 amplifies IFN-dependent signaling, particularly in combination with IFN-alpha.

Conclusions:

  • Ribavirin enhances interferon signaling through a novel mechanism involving the mTOR and p53 pathways.
  • The activation of mTOR and p53 by ribavirin is a key factor in boosting IFN-dependent responses.
  • These findings suggest that ribavirin's modulation of mTOR and p53 contributes to its observed antiviral and antitumor activities.

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