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Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

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Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
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RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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Small molecule inhibitors of Ago2 decrease Venezuelan equine encephalitis virus replication.

Cathaleen Madsen1, Idris Hooper1, Lindsay Lundberg1

  • 1National Center for Biodefense and Infectious Diseases, School of Systems Biology, George Mason University, Manassas, VA, USA.

Antiviral Research
|December 3, 2014
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Summary

Venezuelan equine encephalitis virus (VEEV) therapies are lacking. Inhibiting Ago2, a key protein in microRNA (miRNA) processing, reduced VEEV replication and improved survival in mice, suggesting a potential therapeutic target.

Keywords:
AcriflavineAgo2AlphavirusTherapeuticVenezuelan equine encephalitis virusmiRNA

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Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Venezuelan equine encephalitis virus (VEEV) poses a significant bioterror threat due to severe disease and aerosol transmission.
  • No FDA-approved vaccines or therapies currently exist for VEEV, highlighting the need for novel therapeutic targets.
  • MicroRNAs (miRNAs) are implicated in viral pathogenesis by regulating gene expression.

Purpose of the Study:

  • To investigate the role of host microRNA (miRNA) machinery in VEEV replication.
  • To evaluate the potential of targeting the RNA-induced silencing complex (RISC) component Ago2 as a therapeutic strategy against VEEV.

Main Methods:

  • Utilized cells deficient in Ago2 and treated with Ago2 inhibitors (acriflavine - ACF).
  • Assessed viral replication, capsid expression, and neuronal cell survival in vitro.
  • Evaluated the efficacy of ACF in VEEV-infected mice, including survival and viral loads.

Main Results:

  • Inhibition of Ago2 significantly decreased VEEV replication and capsid expression in vitro.
  • ACF treatment enhanced neuronal cell survival and reduced viral titers for VEEV and related alphaviruses.
  • ACF improved survival in mice infected with VEEV TC-83 but not fully virulent VEEV TrD.

Conclusions:

  • Inhibition of Ago2 effectively reduces encephalitic alphavirus replication in vitro.
  • Targeting the Ago2-miRNA pathway presents a promising avenue for developing novel VEEV therapeutics.