Journal
CURRENT ALLERGY AND ASTHMA REPORTS
Volume 3, Issue 5, Pages 430-437Publisher
CURRENT MEDICINE GROUP
DOI: 10.1007/s11882-003-0080-z
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Healthy individuals are continuously exposed to fungal biomass, which includes live and dead spores and fungal debris that is entrapped in the airways. In patients with asthma and/or atopy, exposure to fungal biomass might result in age-dependent sensitization and asthmatic reactions. Interaction with Toll-like receptors (TLRs), of the innate immune defense (alveolar macrophages and epithelial cells) and protease-activated receptors (PARs) determine the effectiveness of elimination of fungal material. The association of sensitization to Alternaria with severe asthma is discussed in relation to the age-dependent sensitization, rate of release of allergens from spores and activity of its proteases. A model is described concerning the influence of polymorphic genes for airway hyperresponsiveness (AHR) and atopy, showing a cumulating influence on susceptibility for allergen-induced asthma and explaining that fungus-induced airway obstruction is mainly associated with more severe asthma.
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