MicroRNA 876-5p modulates EV-A71 replication through downregulation of host antiviral factors

Virol J. 2020 Feb 5;17(1):21. doi: 10.1186/s12985-020-1284-8.

Abstract

Background: Human enterovirus 71 (EV-A71) is a non-enveloped virus that has a single stranded positive sense RNA genome. In a previous study, we showed that miR-876-5p upregulation was observed in the serum of patients with severe EV-A71 infection. Micro-876-5p (miR-876-5p) is a circulating miRNA that can be identified to modulate EV-A71 infections through both in vitro and in vivo studies. However, the regulatory mechanisms that involve miR-876-5p in the EV-A71 infection cycle remain unclear.

Methods: We demonstrated that miR-876-5p facilitated EV-A71 replication and expression by overexpression and knocking-down of miR-876-5p through the transfection of miR-876-5p plasmid and miR-876-5p inhibitor. Although miR-876-5p suppressed CREB5 expression, luciferase reporter assay confirmed this. We also evaluated the role of miR-876-5p in the EV-A71 infection cycle by CREB5 mediated by transfection with an anti-miR-876-5P inhibitor or in combination with an si-CREB5 plasmid.

Results: MicroR-876-5p was upregulated in EV-A71-infected neuroblastoma cells. Overexpression of miR-876-5p or knockdown of cyclic-AMP responsive element binding protein 5 (CREB5) promoted EV-A71 replication. The downregulation of miR-876-5p inhibited the accumulation of viral RNA and the production of viral proteins. Interestingly, CREB5 overexpression also suppressed EV-A71 replication. Our in vitro studies reveal that miR-876-5p directly targets CREB5. Finally, downregulation of CREB5 protein abated the inhibitory effect of anti-miR-876-5p and induced inhibitory effect of EV-A71 replication.

Conclusions: Our results suggest that intracellular miR-876-5p promotes EV-A71 replication indirectly by targeting the host CREB5 protein.

Keywords: Antiviral protein; CREB5; Enterovirus A71; microRNA-876-5p.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antiviral Agents
  • Cell Line, Tumor
  • Cyclic AMP Response Element-Binding Protein A / genetics
  • Down-Regulation
  • Enterovirus A, Human / genetics
  • Enterovirus A, Human / physiology*
  • Host Microbial Interactions / genetics*
  • Humans
  • Mice
  • Mice, Inbred ICR
  • MicroRNAs / genetics*
  • Neuroblastoma
  • Specific Pathogen-Free Organisms
  • Virus Replication*

Substances

  • Antiviral Agents
  • CREB5 protein, human
  • Cyclic AMP Response Element-Binding Protein A
  • MIRN876 microRNA, human
  • MicroRNAs