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Hydrogen peroxide-induced secondary necrosis in conidia of Aspergillus fumigatus

M Oliveira1,2,3, C Pereira4, C Bessa4

  • 1a Instituto de Investigação e Inovação em Saúde, Universidade Do Porto, Portugal.

Canadian Journal of Microbiology
|December 8, 2015
PubMed

Insights

Hydrogen peroxide (H2O2) induces cell death in Aspergillus fumigatus conidia via secondary necrosis. This finding offers new therapeutic targets for fungal diseases in immunocompromised patients.

Area of Science:

  • Medical Mycology
  • Cell Biology
  • Toxicology

Background:

  • Aspergillus fumigatus conidia are linked to severe aspergillosis in immunocompromised individuals.
  • Secondary metabolites from A. fumigatus conidia exhibit cytotoxic effects.
  • Understanding fungal cell death mechanisms is crucial for disease management.

Purpose of the Study:

  • To adapt a cell death detection methodology for A. fumigatus conidia.
  • To investigate the mechanism of hydrogen peroxide (H2O2)-induced conidial cell death.
  • To elucidate the role of secondary necrosis in H2O2-mediated conidial death.

Main Methods:

  • Adaptation of a cell death marker detection assay for fungal conidia.
  • Treatment of A. fumigatus conidia with varying concentrations of H2O2.
  • Assessment of cell death using TUNEL (Terminal deoxynucleotidyl transferase dUTP nick end labeling) and Propidium Iodide (PI) staining.

Main Results:

  • H2O2-induced cell death in A. fumigatus conidia was observed.
  • A dose-dependent increase in TUNEL- and PI-positive conidia was detected.
  • Conidial cell death occurred through a secondary necrosis pathway.

Conclusions:

  • H2O2 induces conidial cell death in A. fumigatus via secondary necrosis.
  • This mechanism is dose-dependent.
  • Understanding conidial cell death provides insights into A. fumigatus pathogenesis and potential therapeutic strategies.
Keywords:
Aspergillus fumigatusconidiaconidieshydrogen peroxidenécrose secondaireperoxyde d’hydrogènesecondary necrosis

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