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Human Metapneumovirus Small Hydrophobic Protein Inhibits Interferon Induction in Plasmacytoid Dendritic Cells

Xiaoyong Bao1, Deepthi Kolli2, Dana Esham3

  • 1Department of Pediatrics, The University of Texas Medical Branch, Galveston, TX 77555, USA. xibao@utmb.edu.

Viruses
|May 24, 2018
PubMed

Insights

Human metapneumovirus (hMPV) small hydrophobic (SH) protein suppresses type I interferon production. This study reveals hMPV SH protein inhibits innate immune signaling, offering new insights into respiratory virus immune evasion strategies.

Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Human metapneumovirus (hMPV) is a significant cause of infant respiratory infections.
  • The function of the hMPV small hydrophobic (SH) protein remains largely unknown.
  • Innate immune responses, particularly type I interferons (IFNs), are crucial for controlling viral infections.

Purpose of the Study:

  • To elucidate the function of the hMPV SH protein.
  • To investigate the role of hMPV SH protein in modulating innate immune responses in plasmacytoid dendritic cells (pDCs).
  • To identify the molecular mechanisms by which hMPV SH protein impacts immune signaling pathways.

Main Methods:

  • Generation of a recombinant hMPV lacking SH expression (rhMPV-ΔSH).
  • Infection of pDCs with rhMPV-ΔSH and wild-type hMPV.
  • Measurement of type I IFN secretion.
  • Analysis of Toll-like receptor 7 (TLR7), MyD88, and TRAF6 signaling pathways.

Main Results:

  • Infection with rhMPV-ΔSH enhanced type I IFN secretion from pDCs compared to wild-type hMPV.
  • Enhanced IFN secretion was dependent on TLR7 and MyD88 expression.
  • The hMPV SH protein was found to inhibit TLR7/MyD88/TRAF6 signaling, thereby suppressing IFN gene transcription.

Conclusions:

  • The hMPV SH protein acts as an immune antagonist, inhibiting type I IFN production.
  • This inhibition occurs through the suppression of the TLR7/MyD88/TRAF6 signaling cascade.
  • This study identifies a novel mechanism of innate immune modulation by paramyxovirus SH proteins, contributing to hMPV pathogenesis.
Keywords:
SH proteinhMPVplasmacytoid dendritic cellstype I IFN

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