Entry into the stationary phase is associated with a rapid loss of viability and an apoptotic-like phenotype in the opportunistic pathogen Aspergillus fumigatus

S. Amin A Mousavi, Geoffrey D. Robson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    When the opportunistic pathogen Aspergillus fumigatus entered the stationary phase, there was a rapid loss in cell viability which was associated with the appearance of markers characteristic of apoptosis, namely annexin V-FITC binding to the cytoplasmic membrane, demonstrating exposure of phosphatidylserine to the outer leaflet of the membrane; and TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling) staining of the nuclei, indicating DNA fragmentation. This was followed later by a loss of membrane integrity as revealed by propidium iodide staining. The development of the apoptotic phenotype was blocked when the protein synthesis inhibitor cycloheximide was added to the culture 1h prior to the onset of the stationary phase, demonstrating active participation of the cell. In addition, intracellular activity against substrates specific for caspase-1 and -8 also increased on stationary phase entry and the development of the apoptotic phenotype was blocked when the cell permeant caspase inhibitor Z-FAD-fmk was present in the medium. Cell death in A. fumigatus during the stationary phase therefore appears to share similarities to apoptotic cell death in higher eukaryotes and to be dependent on a caspase-like activity. © 2003 Elsevier Science (USA). All rights reserved.
    Original languageEnglish
    Pages (from-to)221-229
    Number of pages8
    JournalFungal Genetics and Biology
    Volume39
    Issue number3
    DOIs
    Publication statusPublished - Aug 2003

    Keywords

    • Apoptosis
    • Aspergillus fumigatus
    • Death
    • Necrosis
    • Stationary phase

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