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Publication year
2010Source
Immunobiology, 215, 11, (2010), pp. 915-920ISSN
Annotation
1 november 2010
Publication type
Article / Letter to editor

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Organization
Internal Medicine
Paediatrics
Journal title
Immunobiology
Volume
vol. 215
Issue
iss. 11
Page start
p. 915
Page end
p. 920
Subject
N4i 2: Invasive mycoses and compromised host; NCMLS 1: Infection and autoimmunityAbstract
Melanin biopigments have been linked to fungal virulence. Aspergillus fumigatus conidia are melanised and are weakly immunogenic. We show that melanin pigments on the surface of resting Aspergillus fumigatus conidia may serve to mask pathogen-associated molecular patterns (PAMPs)-induced cytokine response. The albino conidia induced significantly more proinflammatory cytokines in human peripheral blood mononuclear cells (PBMC), as compared to melanised wild-type conidia. Blocking dectin-1 receptor, Toll-like receptor 4 or mannose receptor decreased cytokine production induced by the albino but not by the wild type conidia. Moreover, albino conidia stimulated less potently, cytokine production in PBMC isolated from an individual with defective dectin-1, compared to the stimulation of cells isolated from healthy donors. These results suggest that beta-glucans, but also other stimulatory PAMPs like mannan derivatives, are exposed on conidial surface in the absence of melanin. Melanin may play a modulatory role by impeding the capability of host immune cells to respond to specific ligands on A. fumigatus.
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- Faculty of Medical Sciences [80065]
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