Epigallocatechin-3-gallate inhibits the early stages of Japanese encephalitis virus infection

Virus Res. 2018 Jul 15:253:140-146. doi: 10.1016/j.virusres.2018.06.009. Epub 2018 Jun 26.

Abstract

Epigallocatechin-3-gallate (EGCG), a green tea catechin, shows broad sepectrum antiviral activity against many RNA and DNA viruses. This study investigated the antiviral efficacy of EGCG against Japanese encephalitis virus (JEV), a zoonotic flavivirus in Southeast Asia and the Western Pacific region. EGCG concentration-dependently reduced CPE, sub-G1 phase, and virus yield of infected cells with different JEV strains at different MOIs. The antiviral activity of EGCG against JEV in different assays declined in the following order: virus yield (IC50 of 7.0 μM) > virus attachment (IC50 of 7.9 μM) > virus entry (IC50 of 9.4 μM) > receptor binding and post-entry. However, EGCG had no virucidal effect on the infectivity of JEV particles. The results indicated that antiviral mechanism of EGCG against JEV was associated with blocking the early steps of JEV infection. The study suggests EGCG as a lead compound for developing broad-spectrum antiviral agents.

Keywords: Antiviral; Entry; Japanese encephalitis virus; Virus attachment; epigallocatechin-3-gallate.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antiviral Agents / pharmacology*
  • Catechin / analogs & derivatives*
  • Catechin / pharmacology
  • Cell Line
  • Cytopathogenic Effect, Viral
  • Encephalitis Virus, Japanese / drug effects*
  • Encephalitis Virus, Japanese / genetics
  • Encephalitis Virus, Japanese / physiology*
  • Encephalitis, Japanese / virology*
  • Humans
  • Virus Attachment / drug effects
  • Virus Internalization / drug effects*
  • Virus Replication / drug effects

Substances

  • Antiviral Agents
  • Catechin
  • epigallocatechin gallate