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Glycerol monolaurate inhibits the effects of Gram-positive select agents on eukaryotic cells

Marnie L Peterson1, Patrick M Schlievert

  • 1Department of Microbiology, University of Minnesota Medical School, Minneapolis, Minnesota 55455-0312, USA.

Biochemistry
|February 16, 2006
PubMed

Insights

Glycerol monolaurate (GML) effectively inhibits harmful Gram-positive bacterial exotoxins, preventing disease effects and lethality in animal models. This natural compound shows promise for treating exotoxin-induced illnesses by stabilizing cell membranes and blocking signal transduction pathways.

Area of Science:

  • Microbiology and Immunology
  • Bioterrorism countermeasures
  • Pharmacology

Background:

  • Gram-positive bacterial exotoxins, including superantigens and anthrax toxin, pose significant bioterrorism threats.
  • These toxins cause disease through immunostimulation or cytotoxicity.
  • Glycerol monolaurate (GML), a naturally occurring human fatty acid monoester, has demonstrated potential in preventing bacterial exotoxin synthesis.

Purpose of the Study:

  • To investigate the efficacy of Glycerol monolaurate (GML) in inhibiting the detrimental effects of Gram-positive bacterial exotoxins on mammalian cells.
  • To evaluate GML's ability to prevent lethality associated with toxic shock syndrome (TSS) in a rabbit model.

Main Methods:

  • Assessed GML's inhibition of superantigen-induced immunoproliferation in human peripheral blood mononuclear cells using (3)H-thymidine incorporation.
  • Measured GML's effect on superantigen-induced cytokine secretion by human vaginal epithelial cells (HVECs) via ELISA.
  • Evaluated GML's protective effects against toxic shock syndrome toxin-1 (TSST-1) induced lethality in rabbits.
  • Determined GML's inhibition of cytotoxicity from anthrax toxin and hemolysins on HVECs and macrophages.
  • Tested GML's membrane-stabilizing properties using erythrocytes under hypotonic stress and in the presence of bacterial hemolysins.
  • Assessed GML's toxicity in mammalian cells and rabbits.

Main Results:

  • GML significantly inhibited superantigen-induced immunoproliferation and cytokine secretion.
  • GML treatment prevented lethality in rabbits challenged with TSST-1.
  • GML protected mammalian cells and erythrocytes from cytotoxicity induced by anthrax toxin and various hemolysins.
  • GML demonstrated membrane-stabilizing effects, reducing erythrocyte lysis.
  • GML exhibited low toxicity to mammalian cells and rabbits at effective concentrations.

Conclusions:

  • Glycerol monolaurate (GML) effectively neutralizes the effects of dangerous Gram-positive bacterial exotoxins, including superantigens and anthrax toxin.
  • GML's mechanism of action involves membrane stabilization and inhibition of signal transduction pathways.
  • GML shows significant therapeutic potential for managing illnesses caused by Gram-positive bacterial exotoxins.

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