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Multiplication of human-derived Pneumocystis carinii in severe combined immunodeficient (SCID) mice
1PROGEN Biotechnical Laboratories, Im Neuenheimer Feld, Heidelberg, Germany.
Abstract:
Clinically healthy SCID mice were infected intratracheally with Pneumocystis carinii (PC) of human origin. The data obtained provides unambiguous evidence that progressive multiplication of PC organisms of human origin takes place in the lungs of experimentally infected animals. SCID mice that were infected with human-derived PC also revealed a markedly greater number of mouse PC organisms in their lungs than the controls. All the SCID recipients of human PC died by day 65 post infection, whereas the controls, housed under identical conditions, started dying significantly later due to severe mouse pneumocystosis. This animal model could be used for the maintenance and propagation of human PC, and for evaluating strategies for treating human pneumocystosis.
Insights
Human Pneumocystis carinii (PC) can progressively multiply in SCID mice lungs. This model shows human PC propagation and aids in developing treatments for human pneumocystosis.
Area of Science:
- Immunology
- Infectious Diseases
- Microbiology
Background:
- Pneumocystis carinii (PC) is an opportunistic pathogen causing pneumonia in immunocompromised individuals.
- Understanding the lifecycle and propagation of human-origin PC is crucial for developing effective treatments.
Purpose of the Study:
- To establish and validate a SCID mouse model for studying human-origin Pneumocystis carinii.
- To investigate the progressive multiplication and impact of human PC in a susceptible host.
Main Methods:
- Severe combined immunodeficient (SCID) mice were intratracheally infected with human-origin Pneumocystis carinii.
- Lung tissues were analyzed for the presence and multiplication of both human and mouse PC organisms.
- Survival rates and clinical signs of infection were monitored in infected and control groups.
Main Results:
- Progressive multiplication of human-origin PC was confirmed in the lungs of experimentally infected SCID mice.
- Infected SCID mice exhibited significantly higher loads of mouse PC organisms compared to controls.
- All SCID mice infected with human PC died by day 65, while control mice succumbed later to severe mouse pneumocystosis.
Conclusions:
- SCID mice serve as a viable animal model for the maintenance and propagation of human-origin Pneumocystis carinii.
- This model is suitable for evaluating therapeutic strategies against human pneumocystosis.
- The study highlights the potential for interspecies transmission and augmentation of Pneumocystis organisms in an immunocompromised host.