Abstract
The effect of treatment with interleukin-8 (IL-8), a neutrophil-activating cytokine, was investigated in normal and neutropenic mice infected with a lethal dose of Pseudomonas aeruginosa, Klebsiella pneumoniae, or Plasmodium berghei. Intraperitoneal (i.p.) IL-8 treatment was associated with accelerated death when IL-8 was administered shortly before i.p. infection with P. aeruginosa or shortly after i.p. infection with P. aeruginosa and K. pneumoniae. Histopathological analyses demonstrated a tendency to more severe organ lesions in IL-8-treated mice. Only nonneutropenic mice that received IL-8 shortly before the infectious challenge and at the site of infection were protected by IL-8. Whether IL-8 is protective of or detrimental to the survival of infection appeared to depend on the presence of bacteria at the injection site and on the presence of neutropenia. IL-8 may be an important participant in the cascade of interacting cytokines that is induced by the lethal infectious challenge.
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