Possible mechanism underlying the antiherpetic activity of a proteoglycan isolated from the mycelia of Ganoderma lucidum in vitro

J Biochem Mol Biol. 2005 Jan 31;38(1):34-40. doi: 10.5483/bmbrep.2005.38.1.034.


GLPG (Ganoderma lucidum proteoglycan) was a bioactive fraction obtained by the liquid fermentation of the mycelia of Ganoderma lucidum, EtOH precipitation, and DEAE-cellulose column chromatography.GLPG was a proteoglycan with a carbohydrate: protein ratio of 10.4: 1. Its antiviral activities against herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) were investigated using a cytopathic inhibition assay. GLPG inhibited cell death in a dose-dependent manner in HSV-infected cells. In addition, it had no cytotoxic effect even at 2 mg/ml. In order to study the mode of action of the antiviral activity of GLPG, cells were treated with GLPG before, during, and after infection, and viral titer in the supernatant of cell culture 48 h post-infection was determined using a TCID((50)) assay. The antiviral effects of GLPG were more remarkable before viral treatment than after treatment. Although the precise mechanism has yet to be defined, our work suggests that GLPG inhibits viral replication by interfering with the early events of viral adsorption and entry into target cells. Thus, this proteoglycan appears to be a candidate anti-HSV agent.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antiviral Agents / isolation & purification
  • Antiviral Agents / pharmacology*
  • Apoptosis / drug effects*
  • Cell Proliferation / drug effects
  • Chlorocebus aethiops
  • Herpesvirus 1, Human / drug effects*
  • Herpesvirus 1, Human / physiology
  • Herpesvirus 2, Human / drug effects*
  • Herpesvirus 2, Human / physiology
  • In Vitro Techniques
  • Mycelium / chemistry*
  • Proteoglycans / isolation & purification
  • Proteoglycans / pharmacology*
  • Reishi / chemistry*
  • Vero Cells / virology
  • Virus Replication / drug effects


  • Antiviral Agents
  • Proteoglycans