Murine model to follow hyphal development in invasive pulmonary aspergillosis

Area of Science:

• Medical Mycology
• Infectious Diseases
• Immunology

Background:

• Aspergillus fumigatus is a major cause of invasive aspergillosis in immunocompromised patients.
• Mortality rates associated with invasive aspergillosis are significant.
• Effective treatment strategies and understanding pathogenicity require robust experimental models.

Purpose of the Study:

• To adapt and validate a murine model for pulmonary aspergillosis.
• To quantitatively assess parameters reflecting fungal infection progression.
• To establish a reliable model for evaluating antifungal therapies.

Main Methods:

• Nasal inoculation of Aspergillus conidia in mice.
• Comparison of immunosuppression methods: cyclophosphamide (CP) versus hydrocortisone (HC).
• Quantitative assessment of survival rate, weight loss, lesion size, hyphal density, hyphal length distribution, and histopathology.

Main Results:

• The cyclophosphamide-induced immunosuppression model was more suitable than hydrocortisone.
• Survival rate, weight loss, and lesion size correlated with infection.
• Hyphal density, length distribution, and histopathological scores quantitatively reflected fungal burden and disease progression.

Conclusions:

• The adapted murine model provides quantitative parameters for studying Aspergillus fumigatus infection.
• This model is crucial for developing new antifungal drugs and therapies.
• It will aid in investigating the pathogenicity of different Aspergillus fumigatus strains.