Prohibitin plays a critical role in Enterovirus 71 neuropathogenesis

PLoS Pathog. 2018 Jan 11;14(1):e1006778. doi: 10.1371/journal.ppat.1006778. eCollection 2018 Jan.

Abstract

A close relative of poliovirus, enterovirus 71 (EV71) is regarded as an important neurotropic virus of serious public health concern. EV71 causes Hand, Foot and Mouth Disease and has been associated with neurological complications in young children. Our limited understanding of the mechanisms involved in its neuropathogenesis has hampered the development of effective therapeutic options. Here, using a two-dimensional proteomics approach combined with mass spectrometry, we have identified a unique panel of host proteins that were differentially and dynamically modulated during EV71 infection of motor-neuron NSC-34 cells, which are found at the neuromuscular junctions where EV71 is believed to enter the central nervous system. Meta-analysis with previously published proteomics studies in neuroblastoma or muscle cell lines revealed minimal overlapping which suggests unique host-pathogen interactions in NSC-34 cells. Among the candidate proteins, we focused our attention on prohibitin (PHB), a protein that is involved in multiple cellular functions and the target of anti-cancer drug Rocaglamide (Roc-A). We demonstrated that cell surface-expressed PHB is involved in EV71 entry into neuronal cells specifically, while membrane-bound mitochondrial PHB associates with the virus replication complex and facilitates viral replication. Furthermore, Roc-A treatment of EV71-infected neuronal cells reduced significantly virus yields. However, the inhibitory effect of Roc-A on PHB in NSC-34 cells was not through blocking the CRAF/MEK/ERK pathway as previously reported. Instead, Roc-A treated NSC-34 cells had lower mitochondria-associated PHB and lower ATP levels that correlated with impaired mitochondria integrity. In vivo, EV71-infected mice treated with Roc-A survived longer than the vehicle-treated animals and had significantly lower virus loads in their spinal cord and brain, whereas virus titers in their limb muscles were comparable to controls. Together, this study uncovers PHB as the first host factor that is specifically involved in EV71 neuropathogenesis and a potential drug target to limit neurological complications.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antiviral Agents / therapeutic use
  • Benzofurans / therapeutic use
  • Cell Line
  • Cell Membrane / drug effects
  • Cell Membrane / metabolism
  • Cell Membrane / ultrastructure
  • Cell Membrane / virology*
  • Enterovirus A, Human / drug effects
  • Enterovirus A, Human / pathogenicity
  • Enterovirus A, Human / physiology*
  • Enterovirus A, Human / ultrastructure
  • Enterovirus Infections / drug therapy
  • Enterovirus Infections / metabolism
  • Enterovirus Infections / pathology
  • Enterovirus Infections / virology
  • Host-Pathogen Interactions* / drug effects
  • Humans
  • Mice
  • Mice, Knockout
  • Microscopy, Electron, Transmission
  • Mitochondrial Membranes / drug effects
  • Mitochondrial Membranes / metabolism
  • Mitochondrial Membranes / ultrastructure
  • Mitochondrial Membranes / virology*
  • Nerve Tissue Proteins / antagonists & inhibitors
  • Nerve Tissue Proteins / genetics
  • Nerve Tissue Proteins / metabolism*
  • Neurons / drug effects
  • Neurons / metabolism
  • Neurons / ultrastructure
  • Neurons / virology*
  • Prohibitins
  • Proteomics / methods
  • RNA Interference
  • Repressor Proteins / antagonists & inhibitors
  • Repressor Proteins / genetics
  • Repressor Proteins / metabolism*
  • Specific Pathogen-Free Organisms
  • Survival Analysis
  • Virus Internalization / drug effects
  • Virus Replication / drug effects

Substances

  • Antiviral Agents
  • Benzofurans
  • Nerve Tissue Proteins
  • PHB protein, human
  • Prohibitins
  • Repressor Proteins
  • rocaglamide

Grants and funding

This study was funded by the National Medical Research Council (NMRC/CBRG/0098/2015) awarded to SA. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.