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MDA5 against enteric viruses through induction of interferon-like response partially via the JAK-STAT cascade

Yang Li1, Peifa Yu1, Changbo Qu2

  • 1Department of Gastroenterology and Hepatology, Erasmus MC-University Medical Center, Rotterdam, the Netherlands.

Antiviral Research
|February 15, 2020
PubMed

Insights

Melanoma Differentiation-Associated protein 5 (MDA5) effectively inhibits enteric virus replication, including hepatitis E virus (HEV), human norovirus (HuNV), and rotavirus. MDA5 triggers an antiviral response partly through the JAK-STAT pathway, offering new insights into host defense mechanisms.

Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Enteric viruses like HEV, HuNV, and rotavirus pose significant global health challenges.
  • The host interferon (IFN) response is crucial for antiviral defense.
  • Melanoma Differentiation-Associated protein 5 (MDA5) is a key sensor of viral infections and an IFN-stimulated gene (ISG).

Purpose of the Study:

  • To investigate the role and mechanism of MDA5 in controlling enteric virus infections.
  • To elucidate how MDA5 influences host antiviral responses against HEV, HuNV, and rotavirus.

Main Methods:

  • Utilized multiple cell models to study viral replication.
  • Assessed the impact of MDA5 overexpression and silencing on viral load.
  • Investigated the activation of IFN-stimulated genes (ISGs) and the JAK-STAT pathway components, including STAT1 phosphorylation.
  • Employed genetic silencing and pharmacological inhibition of the JAK-STAT cascade.

Main Results:

  • MDA5 demonstrated potent inhibition of HEV, HuNV, and rotavirus replication across various cell types.
  • Overexpression of MDA5 induced ISG transcription, mimicking an IFN-like response without producing functional IFN.
  • MDA5 activated STAT1 expression and phosphorylation, a key element of the JAK-STAT pathway.
  • JAK-STAT pathway inhibition only partially reduced MDA5-mediated ISG induction and antiviral activity.

Conclusions:

  • MDA5 effectively suppresses enteric virus replication through a non-canonical, IFN-like response.
  • This antiviral mechanism is partially dependent on the JAK-STAT signaling cascade.
  • MDA5 represents a significant host factor in combating enteric viral infections.
Keywords:
ISGsInnate immunityInterferonMDA5

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