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. 1989 Dec;57(12):3677–3682. doi: 10.1128/iai.57.12.3677-3682.1989

Reassessment of the role of splenic leukocyte oxidative activity and macrophage activation in expression of immunity to malaria.

L A Cavacini 1, M Guidotti 1, L A Parke 1, J Melancon-Kaplan 1, W P Weidanz 1
PMCID: PMC259889  PMID: 2553611

Abstract

The role of splenic leukocyte oxidative activity and macrophage activation in the development of protective immunity was examined during acute Plasmodium chabaudi adami malaria. Splenic leukocyte oxidative activity was compared in infected BALB/c and P/J mice; the latter are known to suffer from defects in macrophage function. Phorbol myristate acetate-stimulated chemiluminescence and superoxide anion production by splenic leukocytes from infected BALB/c mice were found to be increased dramatically, while the response of splenic leukocytes from infected P/J mice was elevated only minimally. Hydrogen peroxide release was slightly increased in splenic leukocytes from infected BALB/c mice but remained essentially unchanged in those from infected P/J mice. Macrophage function was assessed on the basis of measurements of tumoricidal activity. Splenic macrophages from uninfected BALB/c mice displayed significant tumoricidal activity against L929 target cells. As a result of splenomegaly during infection, tumoricidal activity, when calculated on a per-spleen basis, was increased further in infected BALB/c mice. In contrast, the tumoricidal activity of splenic macrophages from P/J mice was minimal, regardless of infection. Despite these differences, both strains of mice developed malarial infections that resolved within 16 days. Thus, while the production of reactive oxygen radicals by splenic leukocytes and the phenomenon of macrophage activation have traditionally been associated with the resolution of malarial infection, this study failed to establish a correlation between these parameters and the development of protective immunity to blood-stage infection with P. chabaudi adami.

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Selected References

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