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A mouse model of Chlamydia pneumoniae strain TWAR pneumonitis
Z P Yang1, C C Kuo, J T Grayston
1Department of Pathobiology, University of Washington, Seattle 98195.
Abstract:
Chlamydia pneumoniae is a common cause of acute respiratory infections in humans. We evaluated mice as experimental animals for C. pneumoniae. Intranasal inoculation of Swiss Webster mice with C. pneumoniae induced a prolonged course of lung infection, as demonstrated by reisolation of organisms from lungs (at 42 days) and persistence of lung pathology (> 60 days). The lung pathology was characterized by patchy interstitial pneumonitis with predominantly polymorphonuclear leukocyte infiltration in the early and mononuclear cell infiltration in the later stages of infection. Inoculated mice developed serum immunoglobulin G antibody responses and partial resistance against rechallenge inoculation. The other mouse strains tested, Icr, BALB/cAnN, C57BL/6N, C3H/HeN, and B6C3F1, were shown to be susceptible to C. pneumoniae. The mouse model should be useful for investigating the immunopathogenesis of C. pneumoniae infections.
Insights
This study establishes a mouse model for Chlamydia pneumoniae infection, demonstrating prolonged lung infection and pathology. This model is valuable for understanding respiratory infections caused by C. pneumoniae.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Background:
- Chlamydia pneumoniae is a significant cause of human acute respiratory infections.
- Understanding the pathogenesis and immune response to C. pneumoniae is crucial.
Purpose of the Study:
- To evaluate the efficacy of mice as experimental models for Chlamydia pneumoniae infections.
- To characterize the lung pathology and immune responses in infected mice.
Main Methods:
- Intranasal inoculation of Swiss Webster mice with Chlamydia pneumoniae.
- Monitoring organism reisolation from lungs and lung pathology.
- Assessing serum immunoglobulin G antibody responses and resistance to rechallenge.
Main Results:
- Swiss Webster mice exhibited prolonged lung infection (organism reisolation at 42 days) and persistent lung pathology (> 60 days).
- Pathology included interstitial pneumonitis with distinct early (polymorphonuclear) and late (mononuclear) cellular infiltrates.
- Inoculated mice developed specific antibody responses and partial resistance upon rechallenge.
- Multiple other mouse strains (Icr, BALB/cAnN, C57BL/6N, C3H/HeN, B6C3F1) were also found susceptible.
Conclusions:
- The developed mouse model effectively replicates key aspects of Chlamydia pneumoniae lung infection.
- This model is suitable for further research into the immunopathogenesis of C. pneumoniae infections.
- The findings support the use of mice for studying host-pathogen interactions in C. pneumoniae disease.