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. 1983 Nov;42(2):733–739. doi: 10.1128/iai.42.2.733-739.1983

Malaria-induced lymphokines: stimulation of macrophages for enhanced phagocytosis.

C F Ockenhouse, H L Shear
PMCID: PMC264491  PMID: 6358030

Abstract

Culture supernatants from antigen-pulsed spleen cells of mice infected previously with either BCG or Plasmodium chabaudi were used to study macrophage activation as judged by phagocytosis of immunoglobulin G-sensitized erythrocytes and Plasmodium berghei- and P. chabaudi-infected erythrocytes. Resident peritoneal macrophages were incubated in vitro with spleen cell factor and then assayed for ingestion of immunoglobulin G-sensitized or parasitized erythrocytes. Macrophages activated with BCG-induced lymphokine bound and ingested two- to threefold more P. berghei parasitized erythrocytes than macrophages incubated with control spleen cell factor. Similarly, Plasmodium-stimulated spleen cells from mice infected with malaria produced a lymphokine(s) capable of activating macrophages for enhanced Fc receptor-mediated phagocytosis. The stimulation of phagocytosis by the lymphokine is nonspecific in nature, since phagocytosis of parasitized erythrocytes from one species of murine malaria is enhanced by the lymphokine prepared from a heterologous species. Nylon wool-nonadherent, malaria-sensitized spleen cells elaborated a lymphokine which stimulates macrophages for enhanced phagocytosis, whereas anti-0-treated spleen cells failed to produce the phagocytosis-promoting lymphokine. Consequently, this lymphokine appears to be elaborated by sensitized T lymphocytes. Interestingly, enhanced phagocytosis of opsonized trophozoites and schizonts, but not ring stage parasites of P. chabaudi, was displayed by macrophages activated with the lymphokine(s) prepared from P. chabaudi-recovered mice. Preincubation of the malaria parasitized erythrocytes with hyperimmune serum raised against the parasites greatly facilitated both binding and ingestion by the stimulated macrophages.

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Selected References

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