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Aspergillus terreus accessory conidia are multinucleated, hyperpolarizing structures that display differential dectin staining and can induce heightened inflammatory responses in a pulmonary model of aspergillosis.
- Source :
-
Virulence [Virulence] 2011 May-Jun; Vol. 2 (3), pp. 200-7. Date of Electronic Publication: 2011 May 01. - Publication Year :
- 2011
-
Abstract
- In addition to phialidic conidia (PC), A. terreus produces accessory conidia (AC) both in vitro and in vivo. AC are distinct from PC in cell surface architecture, with the AC surfaces displaying more β-glucan, a molecule that can be a trigger for the induction of inflammatory responses. The present study follows β-glucan cell surface presentation throughout the course of germination of both types of conidia, and analyzes the differential capacity of AC and PC to elicit immune responses. Results show that AC display early, increased dectin-1 labeling on their cell surfaces compared to PC, and this differential dectin-1 labeling is sustained on the cell surface from the time of breaking dormancy through early germ tube emergence. Mouse alveolar macrophages showed a stronger inflammatory cytokine/chemokine response when challenged with AC than with PC in both ex vivo and in vivo experiments, correlating with the greater exposure of β-glucan exhibited by AC. Further, histopathologic staining of the lungs from mice challenged with AC demonstrated heightened cell recruitment and increased inflammatory response compared to the lungs of mice challenged with PC. Our study also demonstrates that AC are multinucleate structures with the ability to germinate rapidly, polarizing in multiple directions and producing several hyphal extensions. We present evidence that A. terreus AC are phenotypically distinct from PC and can be potent activators of the innate immune mechanism thus possibly playing a role in this organism's pathogenesis.
- Subjects :
- Animals
Aspergillus chemistry
Cytokines metabolism
Disease Models, Animal
Histocytochemistry
Inflammation microbiology
Lectins, C-Type
Lung pathology
Macrophages, Alveolar immunology
Macrophages, Alveolar microbiology
Male
Membrane Proteins metabolism
Mice
Mice, Inbred C57BL
Microscopy
Nerve Tissue Proteins metabolism
Rodent Diseases microbiology
Rodent Diseases pathology
Spores, Fungal chemistry
Staining and Labeling
Aspergillus cytology
Cell Nucleus
Inflammation pathology
Pulmonary Aspergillosis pathology
Spores, Fungal cytology
beta-Glucans analysis
Subjects
Details
- Language :
- English
- ISSN :
- 2150-5608
- Volume :
- 2
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Virulence
- Publication Type :
- Academic Journal
- Accession number :
- 21543882
- Full Text :
- https://doi.org/10.4161/viru.2.3.15799