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Postbacterial sepsis and disseminated candidiasis
Abstract:
The effect of gram-negative sepsis (Escherichia coli) on the capacity of polymorphonuclear leucocytes (PMN) to phagocytize and kill Candida albicans was assessed. The PMN's from septic dogs phagocytized C. albicans as well as PMN's from non-septic dogs. The PMN's from septic dogs that phagocytized C. albicans underwent a spontaneous lysis at a much higher rate than PMN's from non-septic dogs. A functional difference in PMN's from normal and septic dogs is indicated.
Insights
Gram-negative sepsis impairs polymorphonuclear leucocytes (PMN) function. Septic PMN showed increased spontaneous lysis after phagocytizing Candida albicans, indicating a functional deficit in immune cells during sepsis.
Area of Science:
- Immunology
- Microbiology
- Veterinary Medicine
Background:
- Sepsis is a life-threatening condition caused by the body's response to infection.
- Gram-negative bacterial infections, like E. coli sepsis, are common and can lead to severe immune dysregulation.
- Polymorphonuclear leucocytes (PMN) are critical immune cells involved in combating fungal infections, such as Candida albicans.
Purpose of the Study:
- To investigate the functional capacity of PMN in dogs with gram-negative sepsis.
- To assess the impact of sepsis on PMN's ability to phagocytize and kill Candida albicans.
- To determine if sepsis alters PMN behavior and function.
Main Methods:
- Collected PMN from septic and non-septic dogs.
- Exposed PMN to Candida albicans in vitro.
- Assessed phagocytosis rates of C. albicans by PMN.
- Measured spontaneous lysis of PMN after phagocytosis.
Main Results:
- PMN from septic dogs exhibited comparable phagocytosis of C. albicans to PMN from non-septic dogs.
- PMN from septic dogs demonstrated a significantly higher rate of spontaneous lysis post-phagocytosis.
- This suggests an impaired functional response in PMN during sepsis.
Conclusions:
- Gram-negative sepsis affects PMN function, specifically increasing their susceptibility to lysis after interacting with Candida albicans.
- A functional difference exists in PMN derived from septic versus normal dogs.
- These findings highlight a potential mechanism of immune compromise during sepsis.