Aspergillus fumigatus MedA governs adherence, host cell interactions and virulence. Cellular microbiology [Cell Microbiol] Journal article | | Title | Aspergillus fumigatus MedA governs adherence, host cell interactions and virulence. | | Author(s) | Gravelat FN, Ejzykowicz DE, Chiang LY, Chabot JC, Urb M, Macdonald KD, Al-Bader N, Filler SG, Sheppard DC | | Institution | Departments of Microbiology and Immunology, Medicine, McGill University, Montréal, Québec, Canada. | | Source | Cell Microbiol 2009 Nov 2. | | Abstract | In medically important fungi, regulatory elements that control development and asexual reproduction often govern the expression of virulence traits. We therefore cloned the Aspergillus fumigatus developmental modifier MedA and characterized its role in conidiation, host cell interactions and virulence. As in the model organism Aspergillus nidulans, disruption of medA in A. fumigatus dramatically reduced conidiation. However, the conidiophore morphology was markedly different between the two species. Further, gene expression analysis suggested that MedA governs conidiation through different pathways in A. fumigatus compared to A. nidulans. The A. fumigatusDeltamedA strain was impaired in biofilm production and adherence to plastic, as well as adherence to pulmonary epithelial cells, endothelial cells and fibronectin in vitro. The DeltamedA strain also had reduced capacity to damage pulmonary epithelial cells, and stimulate pro-inflammatory cytokine mRNA and protein expression. Consistent with these results, the A. fumigatusDeltamedA strain also exhibited reduced virulence in both an invertebrate and a mammalian model of invasive aspergillosis. Collectively these results suggest that the downstream targets of A. fumigatus MedA mediate virulence, and may provide novel therapeutic targets for invasive aspergillosis. | | Language | ENG | | Pub Type(s) | JOURNAL ARTICLE
| | PubMed ID | 19889083 |
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