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Hepatitis E Virus Papain-Like Cysteine Protease Inhibits Type I Interferon Induction by Down-Regulating Melanoma

Eunha Kim1, Jinjong Myoung1

  • 1Korea Zoonosis Research Institute & Genetic Engineering Research Institute, Chonbuk National University, Iksan 54531, Republic of Korea.

Journal of Microbiology and Biotechnology
|October 12, 2018
PubMed

Insights

Hepatitis E virus protein (HEV PCP) inhibits the host

Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Host cells detect viral RNA using pattern recognition receptors like MDA5 and RIG-I.
  • Activation of these receptors triggers signaling cascades, leading to Type I Interferon (IFN) production.
  • Viruses possess mechanisms to counteract host antiviral responses, including Type I IFN.

Purpose of the Study:

  • To investigate the role of Hepatitis E virus (HEV) protein, specifically HEV PCP, in modulating Type I IFN induction.
  • To determine if HEV PCP acts as an antagonist to the MDA5-mediated antiviral pathway.

Main Methods:

  • Dose-dependent analysis of HEV PCP's effect on interferon-beta induction.
  • Assessment of MDA5 protein expression levels in the presence of HEV PCP.
  • Evaluation of HEV PCP's impact on Type I IFN responses triggered by poly(I:C) and Sendai virus.

Main Results:

  • HEV PCP significantly down-regulates MDA5-mediated interferon-beta induction in a dose-dependent manner.
  • MDA5 protein expression was substantially reduced by HEV PCP.
  • HEV PCP abrogated Type I IFN responses induced by poly(I:C) and Sendai virus, and down-regulated key molecules in IFN induction.

Conclusions:

  • HEV-encoded Protein (HEV PCP) functions as a potent antagonist of Type I Interferon.
  • HEV PCP interferes with host antiviral defenses by inhibiting MDA5-mediated signaling pathways.
Keywords:
Hepatitis E virusMDA5interferon betatype I interferon

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