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• W2014413639 abstract "Aspergillus fumigatus is a filamentous fungus that can cause a life-threatening systemic mycosis in immunocompromised patients. We have studied the growth of A. fumigatus inside cultured cells, and the extracellular growth requirements (in serum). We measured the uptake of bound conidia by the cultured human type II pneumocyte cell line (A549) and a mouse macrophage cell line (J774). The extent of internalization was determined using a nystatin protection assay and by confocal microscopy. Both assays showed that A549 cells internalized 30% of bound conidia after three hours. In contrast, the value for J774 cells was 90%. In both J774 and A549 cells, conidia entered the endosomal pathway and ultimately co-localized with lysosomal markers. Lysosomes containing conidia were acidified. Internalized conidia germinated, and after 24-36 h of incubation with A549 cells, the hyphal tips of some intracellular germlings became exposed to the extracellular space. The importance of iron acquisition to extracellular growth was assessed by creating a strain of A. fumigatus in which the gene encoding the first step of hydroxamate siderophore biosynthesis, ornithine N5-oxygenase (AfusidA), was inactivated by gene replacement. Mutant strains were avirulent in a mouse model of invasive aspergillosis indicating that siderophore biosynthesis is a virulence factor in A. fumigatus." @default.
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• W2014413639 date "2005-01-01" @default.
• W2014413639 modified "2023-09-23" @default.
• W2014413639 title "Intracellular and extracellular growth of<i>Aspergillus fumigatus</i>" @default.
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• W2014413639 doi "https://doi.org/10.1080/13693780400029247" @default.
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