A resourceful giant: APMV is able to interfere with the human type I interferon system

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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
08:32

Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production

Published on: March 2, 2014

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Lorena C F Silva1, Gabriel M F Almeida1, Danilo B Oliveira1

  • 1Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Laboratório de Vírus, Belo Horizonte, Minas Gerais, Brazil.

Microbes and Infection
|December 4, 2013
PubMed

Insights

Acanthamoeba polyphaga mimivirus (APMV) infects human cells and triggers type I interferons (IFNs). However, APMV inhibits interferon-stimulated genes, showing resistance to IFNA2 but sensitivity to IFNB1.

Area of Science:

  • Virology
  • Immunology
  • Cell Biology

Background:

  • Acanthamoeba polyphaga mimivirus (APMV), a giant virus, replicates in human phagocytes and may cause pneumonia.
  • Limited data exists on APMV's interaction with host defense mechanisms, particularly the interferon (IFN) system.

Purpose of the Study:

  • To investigate how APMV stimulates the IFN system in human peripheral blood mononuclear cells (PBMCs).
  • To determine the effect of IFN treatment on APMV replication.
  • To elucidate APMV's host-pathogen interaction within the vertebrate immune system.

Main Methods:

  • Culturing human PBMCs and infecting them with APMV.
  • Measuring type I IFN induction and interferon-stimulated genes (ISGs) expression.
  • Assessing APMV replication under different IFN treatments (IFN-alpha2 and IFN-beta1).

Main Results:

  • APMV replicates productively in human PBMCs, inducing type I IFNs.
  • APMV inhibits ISG induction via mechanisms independent of STAT-1/STAT-2 dephosphorylation.
  • APMV is resistant to IFN-alpha2 but sensitive to IFN-beta1's antiviral effects.

Conclusions:

  • APMV is recognized by and actively inhibits the vertebrate immune system, specifically the IFN response.
  • This study provides the first insights into APMV-IFN system interactions.
  • Findings raise evolutionary questions regarding APMV and vertebrate host relationships.
Keywords:
InterferonMimiviridaePBMCsPhagocytes

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