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Updated: Jul 8, 2026
Murine Model of Allergen Induced Asthma
Published on: May 14, 2012
Inflammatory and remodeling events in asthma with chronic exposure to house dust mites: a murine model
Joong Hyun Ahn1, Chi Hong Kim, Yong Hyun Kim
1Department of Internal Medicine, The Catholic University of Korea, College of Medicine, Seoul, Korea.
Abstract:
Although animal models with ovalbumin have been used to study chronic asthma, there are difficulties in inducing recurrence as well as in maintaining chronic inflammation in this system. Using a murine model of house dust mite (HDM)-induced bronchial asthma, we examined the airway remodeling process in response to the chronic exposure to HDM. During the seventh and twelfth weeks of study, HDM were inhaled through the nose for three consecutive days and airway responsiveness was measured. Twenty-four hours later, bronchoalveolar lavage and histological examination were performed. The degree of overproduction of mucus, subepithelial fibrosis, and the thickness of the peribronchial smooth muscle in the experimental group was clearly increased compared to the control group. In addition, HDM-exposed mice demonstrated severe airway hyperreactivity to methacholine. In the bronchoalveolar lavage fluid, the number of total cells and eosinophils was increased; during the twelfth week, the number of neutrophils increased in the experimental group. With regard to changes in cytokines, the concentrations of IL-4, IL- 13, and transforming growth factor-beta (TGF-beta) were increased in the experimental group. The data suggest that eosinophils, IL-4, IL-13, and TGF-beta might play an important role in the airway remodeling process and that neutrophils may be involved with increased exposure time.
Insights
House dust mite (HDM) exposure in mice causes airway remodeling, including mucus overproduction and smooth muscle thickening. This model highlights the roles of eosinophils, IL-4, IL-13, and TGF-beta in chronic asthma development.
Area of Science:
- Pulmonary Medicine
- Immunology
- Pathology
Background:
- Ovalbumin asthma models face challenges in inducing chronic inflammation and recurrence.
- House dust mite (HDM) is a common allergen implicated in asthma pathogenesis.
- Understanding airway remodeling is crucial for developing effective asthma therapies.
Purpose of the Study:
- To investigate airway remodeling in a murine model of chronic house dust mite (HDM)-induced bronchial asthma.
- To assess the impact of chronic HDM exposure on airway hyperresponsiveness and inflammation.
- To identify key cellular and molecular players involved in HDM-induced airway remodeling.
Main Methods:
- Chronic exposure of mice to house dust mite (HDM) via nasal inhalation over 12 weeks.
- Assessment of airway responsiveness to methacholine.
- Analysis of bronchoalveolar lavage fluid for cellular counts.
- Histological examination of lung tissue for airway remodeling markers.
- Measurement of cytokine concentrations (IL-4, IL-13, TGF-beta) in lung tissue.
Main Results:
- HDM exposure led to significant mucus overproduction, subepithelial fibrosis, and increased peribronchial smooth muscle thickness.
- Mice exposed to HDM exhibited severe airway hyperreactivity.
- Elevated levels of total cells, eosinophils, and neutrophils (at week 12) were observed in bronchoalveolar lavage fluid.
- Increased concentrations of IL-4, IL-13, and TGF-beta were detected in HDM-exposed mice.
Conclusions:
- Eosinophils, IL-4, IL-13, and TGF-beta are key mediators in the airway remodeling process associated with chronic HDM exposure.
- Neutrophil involvement may increase with prolonged exposure duration.
- This HDM-induced asthma model effectively recapitulates key features of human chronic asthma and airway remodeling.
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