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- W2063375433 abstract "Dendritic cells play an important role in the development of immune responses in malaria, but the contribution of plasmacytoid dendritic cells (pDC) to CD4 T cell activation and immunopathology is unknown. We have investigated pDC in a Plasmodium chabaudi infection in mice. During infection, pDC increased in number and transiently up-regulated expression of Major Histocompatibility Complex class II and co-stimulatory molecules. However, in contrast to classical CD11chigh DC, pDC could not phagocytose parasites or process parasite proteins, to activate CD4 T cells. Activation of naïve pDC, but not CD11chigh DC, by infected red blood cells induced IFNα in vitro, which was dependent on the Toll-like receptor, TLR9. However, inactivation of TLR9 in knock-out mice had no effect on a P. chabaudi infection suggesting that TLR9 was not crucial for parasite elimination or pathology. Neither pDC nor IFNαβ were essential for parasite clearance as mice depleted of pDC or IFNαβ Receptor-knock-out mice could control infection. However, these mice lost significantly more weight than untreated or wild-type mice. We conclude that classical DC are the major antigen-presenting cells for CD4 T cells in this infection, but that pDC and IFNαβ may play minor roles in controlling the magnitude of acute stage pathology." @default.
- W2063375433 created "2016-06-24" @default.
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- W2063375433 date "2010-05-01" @default.
- W2063375433 modified "2023-10-14" @default.
- W2063375433 title "Classical CD11c+ dendritic cells, not plasmacytoid dendritic cells, induce T cell responses to Plasmodium chabaudi malaria" @default.
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- W2063375433 doi "https://doi.org/10.1016/j.ijpara.2009.11.005" @default.
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