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      1. Author :
        Claser, C.; Malleret, B.; Gun, S. Y.; Wong, A. Y.; Chang, Z. W.; Teo, P.; See, P. C.; Howland, S. W.; Ginhoux, F.; Renia, L.
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        Journal Article
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      5. Publication :
        PloS one
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      12. Abstract :
        BACKGROUND: Infection with Plasmodium berghei ANKA (PbA) in susceptible mice induces a syndrome called experimental cerebral malaria (ECM) with severe pathologies occurring in various mouse organs. Immune mediators such as T cells or cytokines have been implicated in the pathogenesis of ECM. Red blood cells infected with PbA parasites have been shown to accumulate in the brain and other tissues during infection. This accumulation is thought to be involved in PbA-induced pathologies, which mechanisms are poorly understood. METHODS AND FINDINGS: Using transgenic PbA parasites expressing the luciferase protein, we have assessed by real-time in vivo imaging the dynamic and temporal contribution of different immune factors in infected red blood cell (IRBC) accumulation and distribution in different organs during PbA infection. Using deficient mice or depleting antibodies, we observed that CD8(+) T cells and IFN-gamma drive the rapid increase in total parasite biomass and accumulation of IRBC in the brain and in different organs 6-12 days post-infection, at a time when mice develop ECM. Other cells types like CD4(+) T cells, monocytes or neutrophils or cytokines such as IL-12 and TNF-alpha did not influence the early increase of total parasite biomass and IRBC accumulation in different organs. CONCLUSIONS: CD8(+) T cells and IFN-gamma are the major immune mediators controlling the time-dependent accumulation of P. berghei-infected red blood cells in tissues.
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