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Vaccinia virus complement control protein increases early bacterial clearance during experimental peritonitis
Melanie J Scott1, Phillip T Burch, Puroshottam Jha
1Departments of Surgery, and Microbiology & Immunology, University of Louisville School of Medicine, and the Veterans Affairs Medical Center, Louisville, Kentucky 40292, USA.
Surgical Infections
|March 12, 2004
Summary
Recombinant vaccinia virus complement control protein (rVCP) treatment significantly enhanced early bacterial clearance in mice after sepsis induction. This effect was observed within 4 hours, but not at 18 hours, and did not involve increased neutrophil recruitment.
Area of Science:
- Immunology
- Microbiology
- Sepsis Research
Background:
- Complement system activation is crucial in peritonitis and sepsis, contributing to organ failure.
- Vaccinia virus complement control protein (VCP) inhibits complement pathways by binding C3b and C4b.
- This study explores VCP's role in bacterial clearance during sepsis.
Purpose of the Study:
- To investigate the impact of recombinant VCP (rVCP) on bacterial clearance following cecal ligation and puncture (CLP).
- To determine if rVCP influences neutrophil accumulation and cytokine production in a sepsis model.
Main Methods:
- Swiss Webster mice underwent CLP and received intravenous rVCP or saline.
- Bacterial levels, myeloperoxidase (MPO) for neutrophils, and IL-12 were assessed at 4 and 18 hours.
- Statistical analysis included Mann-Whitney U test and ANOVA.
Main Results:
- rVCP treatment significantly reduced aerobic and anaerobic bacterial loads at 4 hours post-CLP in peritoneal lavage, blood, and liver.
- No significant differences in bacterial levels were found at 18 hours.
- Myeloperoxidase concentrations, differential cell counts, and IL-12 levels remained unchanged between groups.
Conclusions:
- rVCP enhances early bacterial clearance in a mouse model of sepsis.
- The mechanism does not appear to involve increased neutrophil recruitment.
- Further research is needed to understand how rVCP may enhance neutrophil function by modulating complement factors.