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Confocal Laser Scanning Microscopy-Based Quantitative Analysis of Aspergillus fumigatus Conidia Distribution in Whole-Mount Optically Cleared Mouse Lung
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Aspergillus fumigatus synergistically enhances mite-induced allergic airway inflammation

Chizu Fukushima1, Hiroto Matsuse, Susumu Fukahori

  • 12nd Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan.

Medical Science Monitor : International Medical Journal of Experimental and Clinical Research
|June 29, 2010
PubMed
Abstract

Insights

Aspergillus fumigatus (Af) infection worsens allergic asthma by increasing airway inflammation and mucus. This fungal infection, alongside mite allergens, promotes a Th2 immune response, potentially allowing for further Af colonization.

Area of Science:

  • Immunology
  • Pulmonology
  • Microbiology

Background:

  • Infection exacerbates bronchial asthma, with Aspergillus fumigatus (Af) causing allergic bronchopulmonary aspergillosis (ABPA).
  • Asthma patients exhibit unique immunological responses to Af, necessitating investigation into its role in airway inflammation.

Purpose of the Study:

  • To determine how Af enhances pre-existing allergic airway inflammation in asthma.
  • To investigate the colonization potential of Af in the airways of asthmatic subjects.

Main Methods:

  • BALB/c mice were divided into six groups: control, live or dead Af-infected, Dermatophagoides farinae (Df) allergen-sensitized, and Df-sensitized plus Af-infected.
  • Evaluated pulmonary pathology, cytokine profiles, and airway mucous production.

Main Results:

  • Af infection amplified Df allergen-induced eosinophilic inflammation by enhancing Th2-like responses.
  • Live Af exacerbated neutrophilic inflammation, while both live and dead Af increased IL-13 and Muc5ac proteins, leading to mucous hypersecretion.

Conclusions:

  • Mite allergen sensitization with Af infection promotes a Th2-dominant immune response, causing mucous hypersecretion and facilitating Af colonization.
  • Af acts as an allergen exacerbating allergic inflammation and as a pathogen worsening neutrophilic inflammation.
  • Future research should explore glucocorticoid and antifungal drug interventions in this murine model.

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