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Experimental murine invasive pulmonary aspergillosis
D J Eisenstein1, P W Biddinger, J C Rhodes
1Department of Pathology and Laboratory Medicine, University of Cincinnati College of Medicine, Ohio 45267-0529.
Abstract:
A new model of invasive pulmonary aspergillosis (IPA) was developed in immunosuppressed mice. Intranasal route of inoculation was used to deliver predictable numbers of Aspergillus flavus conidia. The LD50 was determined to be 2.7 X 10(2) viable conidia, and a combination of quantitative culture and determination of chitin content was shown to best measure the progression of pulmonary disease. The evolution of IPA in these mice conformed with what has been reported in human cases of aspergillosis; both histopathology of the pulmonary lesions and dissemination pattern resembled their human counterparts. The authors hope to use this model to study virulence mechanisms of Aspergillus and novel therapeutic methods.
Insights
Researchers developed a new mouse model for invasive pulmonary aspergillosis (IPA) using Aspergillus flavus. This model accurately mimics human disease progression and aids in studying fungal virulence and new treatments.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Animal Models
Background:
- Invasive pulmonary aspergillosis (IPA) poses a significant threat to immunocompromised individuals.
- Accurate and reproducible animal models are crucial for understanding IPA pathogenesis and evaluating therapies.
Purpose of the Study:
- To develop and characterize a novel murine model of invasive pulmonary aspergillosis (IPA).
- To establish reliable methods for quantifying disease progression in the model.
- To validate the model's relevance to human IPA through histopathology and dissemination patterns.
Main Methods:
- Immunosuppressed mice were inoculated intranasally with defined quantities of Aspergillus flavus conidia.
- Lethal dose 50 (LD50) was determined.
- Disease progression was assessed using quantitative cultures and chitin content analysis.
- Histopathological examination of lung tissues and analysis of dissemination patterns were performed.
Main Results:
- The LD50 for Aspergillus flavus conidia via intranasal inoculation was established at 2.7 x 10^2 viable conidia.
- A combination of quantitative culture and chitin content measurement effectively monitored pulmonary disease progression.
- The model demonstrated histopathological and dissemination patterns consistent with human IPA cases.
Conclusions:
- The developed mouse model provides a reproducible system for studying invasive pulmonary aspergillosis.
- This model closely mimics key aspects of human IPA, making it valuable for research.
- The model is suitable for investigating Aspergillus virulence factors and testing novel therapeutic strategies.