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Pseudomonas eye infections in cyclophosphamide-treated mice
Investigative Ophthalmology & Visual Science
|July 1, 1977
Summary
Cyclophosphamide pretreatment significantly increases mortality in Pseudomonas aeruginosa-infected mice, leading to septicemia. This immunosuppression model reveals severe corneal damage and highlights the bacterium
Area of Science:
- Ophthalmology
- Immunology
- Microbiology
Background:
- Pseudomonas aeruginosa typically causes localized, self-healing eye infections in mice.
- Bacterial keratitis can lead to significant corneal damage.
Purpose of the Study:
- To investigate the effect of immunosuppression on the course of Pseudomonas aeruginosa eye infections.
- To evaluate the role of cyclophosphamide in modulating host defense against bacterial keratitis and septicemia.
Main Methods:
- Swiss-Webster mice were challenged intracorneally or via anterior chamber with P. aeruginosa.
- Mice were pretreated with cyclophosphamide (intraperitoneal injection) 4 days prior to bacterial challenge.
- Infection severity, mortality, and corneal damage (histochemical and ultrastructural analysis) were assessed.
Main Results:
- Cyclophosphamide pretreatment led to high mortality rates (83% anterior chamber, 54% intracorneal) due to Pseudomonas septicemia within 48 hours.
- Untreated infections were localized and healed spontaneously within 4-6 weeks.
- Corneal damage was observed in surviving animals within 24-48 hours post-challenge.
Conclusions:
- Cyclophosphamide-induced immunosuppression dramatically exacerbates P. aeruginosa eye infections, promoting systemic spread and mortality.
- This model is useful for studying the pathogenesis of severe bacterial keratitis and the impact of host immune status.
- Effective immune response is crucial for controlling P. aeruginosa ocular infections.