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Confocal Laser Scanning Microscopy-Based Quantitative Analysis of Aspergillus fumigatus Conidia Distribution in Whole-Mount Optically Cleared Mouse Lung
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Induction of gliotoxin secretion in Aspergillus fumigatus by bacteria-associated molecules

K Stefan Svahn1, Ulf Göransson1, Erja Chryssanthou2

  • 1Department of Medicinal Chemistry, Uppsala University, Uppsala, Sweden.

Plos One
|April 8, 2014
PubMed

Insights

Pathogen-associated molecular patterns from bacteria stimulate gliotoxin production in Aspergillus fumigatus. This discovery may enhance drug discovery and explain increased fungal virulence during co-infections.

Area of Science:

  • Medical Mycology
  • Microbial Pathogenesis
  • Drug Discovery

Background:

  • Aspergillus fumigatus causes severe infections in immunocompromised individuals.
  • Gliotoxin, a toxic metabolite from A. fumigatus, has antimicrobial properties.
  • Bacterial co-infections can increase A. fumigatus virulence.

Purpose of the Study:

  • To investigate if pathogen-associated molecular patterns (PAMPs) from bacteria can induce gliotoxin production in A. fumigatus.
  • To explore the potential mechanisms behind fungal response to bacterial molecules.
  • To assess the implications for fungal virulence and drug discovery.

Main Methods:

  • Broth cultures of A. fumigatus were exposed to bacterial PAMPs (lipopolysaccharide, peptidoglycan, lipoteichoic acid).
  • Gliotoxin concentrations were quantified using ultra-performance liquid chromatography and mass spectrometry.
  • Statistical analysis was performed to determine the significance of gliotoxin level changes.

Main Results:

  • Exposure to bacterial lipopolysaccharide, peptidoglycan, and lipoteichoic acid significantly increased gliotoxin production by 37%, 65%, and 35%, respectively.
  • A dose-dependent correlation was observed between PAMP concentration and gliotoxin secretion.
  • These findings suggest an uncharacterized fungal detection system for bacterial molecules.

Conclusions:

  • Bacterial PAMPs stimulate gliotoxin production in A. fumigatus, indicating a potential inter-kingdom communication pathway.
  • This interaction may contribute to increased A. fumigatus virulence during bacterial co-infections.
  • Targeting this pathway could offer novel strategies for antifungal drug development.

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