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Infect. Immun., Jul 1997, 2517-2521, Vol 65, No. 7
M Verdrengh and A Tarkowski
We have previously described a murine model of hematogenously induced
Staphylococcus aureus sepsis and arthritis. In this model, large numbers of
granulocytes can be observed both in the circulation and locally in the
inflamed synovium within 24 h after bacterial inoculation. To assess the
role of neutrophils in this severe infection, mice were given
granulocyte-depleting monoclonal antibody RB6-8C5 before being inoculated
with S. aureus. All the control mice survived their intravenous injection
with 3 x 10(7) CFU of S. aureus, whereas all the mice given RB6-8C5
antibody died of sepsis within 2 to 3 days. Even when the inoculum size was
reduced sixfold (i.e., 6 x 10(6) CFU/mouse), 50% of the RB6-8C5-treated
animals died within 6 days. The RB6-8C5-treated mice had a significantly
higher burden of bacteria in their blood and kidneys 24 and 48 h after
bacterial inoculation. In addition, when a suboptimal dose of bacteria was
administered, the neutrophil-depleted animals displayed a higher frequency
of arthritis than did the controls. The granulocyte-depleted animals
exhibited increased levels of the proinflammatory cytokines tumor necrosis
factor alpha, interleukin-6, and gamma interferon, reflecting the severity
of their disease. This is the first direct demonstration of neutrophils
playing a crucial protective role in the early phase of S. aureus
infection.
Copyright © 1997, American Society for Microbiology
Role of neutrophils in experimental septicemia and septic arthritis induced by Staphylococcus aureus
Department of Rheumatology, University of Goteborg, Sweden.
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