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Complement depletion aggravates Staphylococcus aureus septicaemia and septic arthritis
E Sakiniene1, T Bremell, A Tarkowski
1Department of Rheumatology, University of Gothenburg, Gothenburg, Sweden.
Clinical and Experimental Immunology
|February 5, 1999
Summary
Complement depletion worsens Staphylococcus aureus arthritis and septicaemia in mice. This occurs due to reduced white blood cell migration and impaired phagocytosis, increasing disease severity and mortality.
Area of Science:
- Immunology
- Microbiology
Background:
- The complement system is crucial for innate immunity.
- Staphylococcus aureus infections, including arthritis and septicaemia, pose significant health challenges.
Purpose of the Study:
- To investigate the role of the complement system in Staphylococcus aureus-induced arthritis and septicaemia.
- To evaluate the impact of complement depletion on immune cell function during infection.
Main Methods:
- A murine model of Staphylococcus aureus (S. aureus) septic arthritis was utilized.
- Complement was depleted using cobra venom factor (CVF).
- Arthritis severity was assessed clinically and histopathologically; phagocytic activity of leukocytes was measured in vitro and in vivo.
Main Results:
- Complement depletion significantly increased the prevalence and severity of S. aureus arthritis.
- Histological analysis revealed greater synovitis and cartilage/bone destruction in decomplemented mice.
- Mortality from septicaemia was higher in decomplemented mice, which also showed reduced leukocyte migration and phagocytic activity.
Conclusions:
- Complement plays a protective role in Staphylococcus aureus arthritis and septicaemia.
- Complement depletion exacerbates S. aureus infections by impairing leukocyte recruitment and phagocytosis.