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Nude mouse: a new experimental model for Pneumocystis carinii infection
Abstract:
Experimental infection with both human- and rat-derived Pneumocystis carinii has been produced in nude mice by intrapulmonary injection of lung homogenates that contained P. carinii and by environmental transmission. Most infected mice did not appear ill, and their lungs exhibited a mild and nonspecific inflammatory response. Thus, P. carinii can be transmitted from one animal species to another, and this result suggests that a defect in thymic-dependent lymphocytes is important in the development of the infection. Experimental work with P. carinii in the nude mouse should be performed in isolators because of the communicability of the organism.
Insights
Experimental Pneumocystis carinii infection was established in nude mice, demonstrating cross-species transmission and highlighting the role of lymphocyte defects. Researchers recommend isolator use due to organism communicability.
Area of Science:
- Immunology
- Microbiology
- Infectious Diseases
Background:
- Pneumocystis carinii is an opportunistic pathogen that causes pneumonia in immunocompromised individuals.
- Nude mice, lacking a thymus, have a severe defect in cell-mediated immunity, making them susceptible to infections.
Purpose of the Study:
- To establish experimental Pneumocystis carinii infection in nude mice.
- To investigate the transmission dynamics and host response to P. carinii in an immunocompromised animal model.
Main Methods:
- Experimental infection was induced in nude mice via intrapulmonary injection of lung homogenates containing P. carinii.
- Environmental transmission was also assessed.
- Lung homogenates from infected mice were analyzed for inflammatory responses.
Main Results:
- Successful experimental infection with both human- and rat-derived P. carinii was achieved in nude mice.
- Mild, nonspecific inflammatory responses were observed in the lungs of infected mice.
- Evidence of environmental transmission between animals was noted.
Conclusions:
- Pneumocystis carinii can be transmitted between different animal species.
- A defect in thymic-dependent lymphocytes is crucial for P. carinii infection development.
- Experimental studies involving P. carinii in nude mice necessitate the use of isolators due to the organism's communicability.