Related Experiment Videos
[Immunosuppressive effect of cyclophosphamide in experimental coagulase-negative staphylococcal infection]
1Debreceni Orvostudományi Egyetem, Mikrobiológiai Intézet.
Abstract:
BALB/c mice were given 200 mg/kg cyclophosphamide intraperitoneally. Three days later, mice were infected intraperitoneally with Staphylococcus epidermidis, Staphylococcus haemolyticus, Staphylococcus saprophyticus at 4 inocula ranging between 2 x and 20 x 10(8) CFU/ml suspended in dextran microcarrier solution. Controls were treated only with bacteria. Lethality rates and organ persistence of cocci were significantly higher, and more peritoneal abscesses and adhesions developed in the mice pretreated with cyclophosphamide than in the untreated controls, regardless of the species of Staphylococcus injected. Splenomegaly was also more pronounced indicating a probably enhanced compensatory reactivity of the immune system liberated from suppression 13 days after the administration of cyclophosphamide. Our results show that cyclophosphamide treatment increases the susceptibility of mice to infection by coagulase-negative staphylococci and it is also responsible for a more severe course of the diseases provoked.
Insights
Cyclophosphamide (CTX) treatment significantly increases mouse susceptibility to coagulase-negative staphylococci infections. This immunosuppression leads to higher mortality, increased bacterial persistence, and more severe disease outcomes.
Area of Science:
- Immunology
- Microbiology
- Pharmacology
Background:
- Cyclophosphamide (CTX) is an immunosuppressive chemotherapeutic agent.
- Coagulase-negative staphylococci (CoNS) are opportunistic pathogens.
- The impact of CTX-induced immunosuppression on CoNS infection severity is not fully elucidated.
Purpose of the Study:
- To investigate the effect of cyclophosphamide pretreatment on the susceptibility and disease course of mice infected with coagulase-negative staphylococci.
Main Methods:
- BALB/c mice were administered cyclophosphamide (200 mg/kg, i.p.).
- Mice were subsequently infected with Staphylococcus epidermidis, S. haemolyticus, or S. saprophyticus at varying inocula.
- Lethality, organ bacterial load, peritoneal abscesses, adhesions, and splenomegaly were assessed.
Main Results:
- Cyclophosphamide-treated mice exhibited significantly higher mortality rates and bacterial organ persistence compared to controls.
- Increased incidence of peritoneal abscesses and adhesions was observed in CTX-pretreated mice.
- Pronounced splenomegaly suggested a compensatory immune response post-immunosuppression.
Conclusions:
- Cyclophosphamide treatment enhances susceptibility to coagulase-negative staphylococci infection in mice.
- CTX administration leads to a more severe clinical course of staphylococcal infections.
- These findings highlight the critical role of immune status in managing opportunistic bacterial infections.