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- W2027984089 abstract "Plasmodium sporozoites traverse Kupffer cells on their way into the liver. Sporozoite contact does not elicit a respiratory burst in these hepatic macrophages and blocks the formation of reactive oxygen species in response to secondary stimuli via elevation of the intracellular cAMP concentration. Here we show that increasing the cAMP level with dibutyryl cyclic adenosine monophosphate (db-cAMP) or isobutylmethylxanthine (IBMX) also modulates cytokine secretion in murine Kupffer cells towards an overall anti-inflammatory profile. Stimulation of Plasmodium yoelii sporozoite-exposed Kupffer cells with lipopolysaccharide or IFN-γ reveals down-modulation of TNF-α, IL-6 and MCP-1, and up-regulation of IL-10. Prerequisite for this shift of the cytokine profile are parasite viability and contact with Kupffer cells, but not invasion. Whilst sporozoite-exposed Kupffer cells become TUNEL-positive and exhibit other signs of apoptotic death such as membrane blebbing, nuclear condensation and fragmentation, sporozoites remain intact and appear to transform to early exo-erythrocytic forms in Kupffer cell cultures. Together, the in vitro data indicate that Plasmodium possesses mechanisms to render Kupffer cells insensitive to pro-inflammatory stimuli and eventually eliminates these macrophages by forcing them into programmed cell death." @default.
- W2027984089 created "2016-06-24" @default.
- W2027984089 creator A5042349359 @default.
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- W2027984089 date "2008-12-01" @default.
- W2027984089 modified "2023-09-27" @default.
- W2027984089 title "Plasmodium yoelii sporozoites modulate cytokine profile and induce apoptosis in murine Kupffer cells" @default.
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- W2027984089 doi "https://doi.org/10.1016/j.ijpara.2008.05.018" @default.
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