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Purified recombinant A. fumigatus allergens induce different responses in mice
V P Kurup1, J Q Xia, R Crameri
1Allergy-Immunology Division, Medical College of Wisconsin, Milwaukee, Wisconsin 53226, USA.
Abstract:
Aspergillus fumigatus an opportunistic fungus is associated with a number of diseases in humans. Allergy resulting from exposure to the A. fumigatus allergens has been recognized frequently. The damage caused by the disease is very striking in patients with atopy and those with cystic fibrosis. Avoidance to exposure is not feasible because A. fumigatus spores are ubiquitously distributed in the environment. Hence, immunotherapeutic regimens in severe forms of A. fumigatus allergy may have a high potential. However, before such forms of therapy can be envisaged, it is essential to understand the immunopathogenesis. In the present study, we investigated the role of purified A. fumigatus allergens in the development of allergic asthma in mice. We have used four major recombinant A. fumigatus allergens in the murine model. Mice exposed to Asp f 1, f 3, and f 4 showed inflammatory changes in the lungs and airway hyperreactivity. The immune responses, including elevated serum IgE, enhanced eosinophils, recruitment in the peripheral blood and lungs, and expression of regulatory cytokines, are characteristic of a Th2 response. Asp f 6 demonstrated only a reduced response in these animals. The results suggest that the pathology induced by crude A. fumigatus extract results from the cumulative effects of the allergens and the individual responses varied considerably with different purified antigens.
Insights
Aspergillus fumigatus allergens trigger allergic asthma in mice. Specific allergens like Asp f 1, 3, and 4 cause lung inflammation and airway hyperreactivity, indicating a Th2 immune response.
Area of Science:
- Medical Mycology
- Immunology
- Allergy Research
Background:
- Aspergillus fumigatus is an opportunistic fungus causing human diseases, notably allergies.
- Exposure avoidance is difficult due to ubiquitous environmental spores.
- Understanding immunopathogenesis is crucial for developing immunotherapies for severe A. fumigatus allergy.
Purpose of the Study:
- To investigate the role of purified Aspergillus fumigatus allergens in allergic asthma development.
- To analyze the immune responses induced by specific recombinant A. fumigatus allergens in a murine model.
Main Methods:
- Utilized a murine model exposed to four major recombinant A. fumigatus allergens (Asp f 1, f 3, f 4, and f 6).
- Assessed lung inflammation, airway hyperreactivity, serum IgE levels, eosinophil recruitment, and cytokine expression.
Main Results:
- Exposure to Asp f 1, f 3, and f 4 induced lung inflammation and airway hyperreactivity in mice.
- Characteristic Th2 immune responses, including elevated IgE and eosinophilia, were observed.
- Asp f 6 elicited a reduced response compared to other tested allergens.
Conclusions:
- The pathology from crude A. fumigatus extract is likely due to cumulative allergen effects.
- Individual purified allergens induce varying immune responses and disease severity.
- This study highlights specific A. fumigatus allergens as key drivers of allergic asthma.