Fungicidal Activity of Five Cathelicidin Peptides Against Clinically Isolated Yeasts

J Antimicrob Chemother. 2006 Nov;58(5):950-9. doi: 10.1093/jac/dkl382. Epub 2006 Oct 5.

Abstract

Objectives: To investigate the in vitro antifungal activity of the structurally different cathelicidin peptides SMAP-29, BMAP-27, BMAP-28, protegrin-1 (PG-1) and indolicidin.

Methods: The in vitro antifungal and fungicidal activities of these antimicrobial peptides were respectively assessed via MIC determinations and killing kinetics assays. The effects of the peptides on membrane permeabilization and morphology were evaluated by flow cytometry, intracellular ATP release measurements and scanning electron microscopy.

Results: All five peptides showed a potent but differential antifungal activity against more than 70 clinical isolates belonging to over 20 different species of pathogenic fungi; some of which are resistant to amphotericin B and azoles. The MIC values of the peptides ranged between 0.5 and 32 microM, with PG-1 being the most effective and having the widest spectrum of activity. Filamentous fungi were instead found to be scarcely susceptible to the action of these cathelicidin peptides. All these cathelicidins rapidly killed Candida albicans and Cryptococcus neoformans cells in a dose- and time-dependent manner. The rapid uptake of propidium iodide into treated cells and morphological alterations apparent on their cellular surfaces suggest a killing mechanism based on membrane permeabilization and damage.

Conclusions: This study indicates that these five structurally varied host defence peptides are all endowed with the capacity to inactivate a number of fungal pathogens, irrespectively of their resistance to antifungal drugs, and suggests they might be potentially useful leads for the development of novel fungicidal agents.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Antifungal Agents / pharmacokinetics
  • Antifungal Agents / pharmacology*
  • Antimicrobial Cationic Peptides / pharmacokinetics
  • Antimicrobial Cationic Peptides / pharmacology*
  • Candida albicans / drug effects*
  • Candida albicans / isolation & purification
  • Candida albicans / metabolism
  • Candidiasis / microbiology
  • Cattle
  • Cell Membrane Permeability / drug effects
  • Cryptococcosis / microbiology
  • Cryptococcus neoformans / drug effects*
  • Cryptococcus neoformans / isolation & purification
  • Cryptococcus neoformans / metabolism
  • Humans
  • Microbial Sensitivity Tests
  • Molecular Sequence Data
  • Swine

Substances

  • Antifungal Agents
  • Antimicrobial Cationic Peptides
  • CAP18 lipopolysaccharide-binding protein