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- W1983153259 abstract "Malarial pigment, a unique hemozoin crystal composed of unit cells of heme dimers, is present in large amounts in circulating monocytes and neutrophils and can persist unchanged in macrophages for several months. In the present study, we investigated the effect of hemozoin not only on macrophages, but also on neutrophils. We used beta-hematin (BH), a chemically synthetic crystal structurally identical to hemozoin, for these studies. In vitro, BH up-regulated the expression of tumor necrosis factor-alpha in whole blood and in isolated peritoneal macrophages, indicating that hemozoin is able to stimulate monocytes. BH stimulated murine peritoneal neutrophils to express macrophage inflammatory protein-2 (MIP-2), a homologue of human interleukin-8 that is used as a marker of neutrophil activation. Injecting BH into the peritoneal cavity resulted in a dose-dependent migration of neutrophils and a high level of myeloperoxidase activity of peritoneal cells. Finally, BH directly induced neutrophil chemotaxis in vitro. Taken together, these results suggest that the malarial pigment hemozoin can activate leukocytes and may participate in the pathology of severe malaria." @default.
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- W1983153259 date "2006-03-01" @default.
- W1983153259 modified "2023-09-26" @default.
- W1983153259 title "Leukocyte activation by malarial pigment" @default.
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- W1983153259 doi "https://doi.org/10.1016/j.parint.2005.10.003" @default.
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