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. 1982 Sep;37(3):927–934. doi: 10.1128/iai.37.3.927-934.1982

Differential sensitivity in vivo of lethal and nonlethal malarial parasites to endotoxin-induced serum factor.

J Taverne, P Depledge, J H Playfair
PMCID: PMC347627  PMID: 6752029

Abstract

Sera from mice infected with Plasmodium yoelii or Plasmodium berghei and given endotoxin contained nonspecific mediators which killed both species of parasite and tumor cells in vitro. The sera resembled tumor necrosis sera obtained from mice given macrophage-activating agents such as Propionibacterium acnes (formerly designated Corynebacterium acnes) or Mycobacterium bovis BCG and then endotoxin. Cytotoxicity developed parallel to parasite killing activity and indicated that macrophages were activated. Activation occurred sooner with P. berghei, which is lethal, and serum activity remained on a plateau until the mice died. In nonlethal P. yoelii infections, activation was related to the course of parasitemia. Endotoxin given to mice infected with P. yoelii caused an immediate decrease in parasitemia, presumably through the release of parasite killing factors. The extent of the decrease depended upon the time of administration. No immediate drop in the parasitemia caused by P. berghei was observed at any time. Early administration of endotoxin prolonged survival; late administration accelerated death. Passive transfer of rabbit tumor necrosis serum to infected mice decreased the parasitemia caused by P. yoelii but not that caused by P. berghei. Other components of the immune response appeared to act together with these soluble mediators to eliminate P. yoelii; they may be absent or suppressed in infections with P. berghei.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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