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[Staphylococcal induction of suppressors of macrophage phagocytic activity]
Abstract:
During experimental infection caused by S. aureus, strain Smith, the formation of suppressors of the phagocytic activity of macrophages was induced in the peritoneal cavity and the spleen of intact and infected mice. Thus, in the cultivation of macrophages of the infected mice together with nonadhering cells of the peritoneal exudate of the infected animals the phagocytic index was 0.75 +/- 0.09; in the presence of splenocytes of the infected mice the phagocytic index for macrophages of the intact and infected animals was 0.64 +/- 0.12 and 0.89 +/- 0.04, respectively. Splenocytes of the intact mice, when cultivated together with macrophages of the infected mice, enhanced phagocytic activity during the first hours of cultivation and suppressed it after prolonged cultivation (12 hours); the phagocytic index was 1.37 +/- 0.18 and 0.82 +/- 0.03, respectively.
Insights
Experimental Staphylococcus aureus infection in mice induced suppressors of macrophage phagocytic activity. Immune cells from infected mice, particularly splenocytes, modulated macrophage function, impacting bacterial clearance during infection.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Staphylococcus aureus (S. aureus) infection can lead to complex host immune responses.
- Phagocytosis by macrophages is a critical mechanism for clearing bacterial pathogens.
- Understanding immune cell interactions during infection is vital for developing therapeutic strategies.
Purpose of the Study:
- To investigate the induction of macrophage phagocytic activity suppressors during S. aureus infection.
- To determine the role of peritoneal exudate cells and splenocytes in modulating macrophage function in infected mice.
Main Methods:
- Experimental infection of mice with S. aureus, strain Smith.
- Co-cultivation assays involving macrophages and non-adherent peritoneal exudate cells or splenocytes from intact and infected mice.
- Measurement of the phagocytic index to quantify macrophage phagocytic activity.
Main Results:
- Infection induced suppressors of macrophage phagocytic activity in the peritoneal cavity and spleen.
- Co-culturing macrophages from infected mice with non-adherent peritoneal cells from infected mice resulted in a phagocytic index of 0.75 +/- 0.09.
- Splenocytes from infected mice suppressed macrophage phagocytic activity (index 0.64 +/- 0.12 for intact macrophages, 0.89 +/- 0.04 for infected macrophages).
- Intact splenocytes initially enhanced, then suppressed macrophage phagocytosis in infected mice over 12 hours (indices 1.37 +/- 0.18 and 0.82 +/- 0.03, respectively).
Conclusions:
- S. aureus infection triggers the formation of suppressors affecting macrophage phagocytosis.
- Both peritoneal exudate cells and splenocytes play a role in modulating macrophage function during S. aureus infection.
- The temporal and cellular context of immune cell interactions is crucial for determining phagocytic activity outcomes.