We have demonstrated that direct antigen sampling of bacteria by intestinal dendritic cells (DCs) is accompanied by a rapid migration of CD11c+CX3CR1+MHCII+CD8α-CD11b− DCs into the intestinal lumen upon exposure to non-invasive ΔSPI1-Salmonella. Importantly, intraluminal DCs internalized Salmonella but were not able to cross the epithelium to return into tissue, thus showing that these DCs do not function as antigen-presenting cells and participate in the conventional regulation of immune responses to intestinal pathogens. Here we show that the presence of the chemokine receptor CX3CR1, that plays a vital role in DC-mediated antigen sampling and clearance in the gut, is also instrumental for the transepithelial migration of DCs. The latter observation, along with the notion that CX3CR1-deficient mice displayed higher susceptibility to Salmonella infection compared to wild-type mice raises the possibility that Salmonella-induced migration of “bacteria-capturing” DCs into the lumen may be an important mechanism of mucosal defence and clearance.
CX₃CR1 is critical for Salmonella-induced migration of dendritic cells into the intestinal lumen / Nicoletti, Claudio; Arques, Juan L; Bertelli, Eugenio. - In: GUT MICROBES. - ISSN 1949-0976. - STAMPA. - 1:(2010), pp. 131-134. [10.4161/gmic.1.3.11711]
CX₃CR1 is critical for Salmonella-induced migration of dendritic cells into the intestinal lumen
NICOLETTI, CLAUDIO;
2010
Abstract
We have demonstrated that direct antigen sampling of bacteria by intestinal dendritic cells (DCs) is accompanied by a rapid migration of CD11c+CX3CR1+MHCII+CD8α-CD11b− DCs into the intestinal lumen upon exposure to non-invasive ΔSPI1-Salmonella. Importantly, intraluminal DCs internalized Salmonella but were not able to cross the epithelium to return into tissue, thus showing that these DCs do not function as antigen-presenting cells and participate in the conventional regulation of immune responses to intestinal pathogens. Here we show that the presence of the chemokine receptor CX3CR1, that plays a vital role in DC-mediated antigen sampling and clearance in the gut, is also instrumental for the transepithelial migration of DCs. The latter observation, along with the notion that CX3CR1-deficient mice displayed higher susceptibility to Salmonella infection compared to wild-type mice raises the possibility that Salmonella-induced migration of “bacteria-capturing” DCs into the lumen may be an important mechanism of mucosal defence and clearance.File | Dimensione | Formato | |
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