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. 1986 Jan;51(1):141–146. doi: 10.1128/iai.51.1.141-146.1986

Plasmodium berghei malaria: effects of acute-phase serum and erythrocyte-bound immunoglobulins on erythrophagocytosis by rat peritoneal macrophages.

B J Packer, J P Kreier
PMCID: PMC261077  PMID: 3510164

Abstract

Acute-phase serum (APS) collected from Plasmodium berghei-infected rats inhibited phagocytosis of trypsinized rat erythrocytes and of erythrocytes from P. berghei-infected rats. Macrophages (M phi) incubated with APS or heat-aggregated acute-phase serum (HAAPS) for 6 h, followed by 18 h incubation in serum-free medium, exhibited significantly higher levels of phagocytosis than M phi similarly cultured but with normal rat serum. When APS was present at the time of assay, it inhibited erythrophagocytosis by M phi which had been in culture for 0 or 24 h. M phi activation by HAAPS was inhibited by 2-deoxy-D-glucose, which suggests that activation by HAAPS is Fc-receptor mediated. Adsorption of APS with staphylococcal protein A abrogated the ability of APS to inhibit phagocytosis and that of HAAPS to effect M phi activation, suggesting that immune complexes are involved in both processes. Surface-bound immunoglobulins eluted from erythrocytes of P. berghei-infected rats promoted phagocytosis of trypsinized erythrocytes by HAAPS-activated M phi but not by resting M phi. These results indicate that the immunoglobulins which bind to infected or damaged erythrocytes during malarial infections promote erythrophagocytosis by activated M phi and that the immune complexes in serum from rats with acute malaria may inhibit erythrophagocytosis early in the infection but may, over time, induce changes in the M phi which later facilitate erythrophagocytosis.

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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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