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• W2077510150 abstract "Summary Since transmission of Francisella tularensis into the mammalian host occurs via arthropod vectors such as ticks, mosquitoes, horseflies and deerflies, recent studies have established Drosophila melanogaster as an arthropod vector model system. Nothing is known about the intracellular fate of F. tularensis within arthropod‐derived cells, and the role of this host‐parasite adaptation in the evolution of this pathogen to infect mammals. In this report, we explored intracellular trafficking of F. tularensis ssp. novicida in D. melanogaster ‐derived S2 cells. First, we show that similar to the F. tularensis ssp. holarctica‐ derived LVS strain, F. tularensis ssp. novicida is highly infectious, replicates exponentially within S2 cells and within adult flies, and is fatal to adult fruit flies in a dose‐dependent manner, while the iglC , iglD and mglA mutants are defective. Using electron and fluorescence microscopy‐based phagosome integrity assays, we show that the wild‐type strain escapes into the cytosol of S2 cells within 30–60 min post infection and by 6 h, 90% were cytosolic. In contrast, approximately 40–50% of the iglC and iglD mutants escape into the cytosol by 6 h while the other subpopulation becomes enclosed within multilamellar vesicles (MLVs). Pre‐treatment of S2 cells with the autophagy inhibitor methyl adenine blocks formation of the MLVs and all the vacuolar subpopulation of the iglC and iglD mutant bacteria become enclosed within single membrane‐surrounded vacuoles. Endocytic trafficking studies of F. tularensis within S2 cells show transient colocalization of the bacterial phagosome with D. melanogaster LAMP2–GFP fusion but not with lysosomes pre‐loaded with fluorescent dextran. Our data show that MLVs harbouring the iglC mutant acquire Lamp2 and dextran while MLVs harbouring the iglD mutant exclude these late endosomal and lysosomal markers. Our data indicate crucial differences in the role of the pathogenicity island‐encoded proteins in modulating intracellular trafficking within human macrophages and arthropod vector‐derived cells." @default.
• W2077510150 created "2016-06-24" @default.
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• W2077510150 date "2009-05-31" @default.
• W2077510150 modified "2023-10-17" @default.
• W2077510150 title "Intracellular fate of <i>Francisella tularensis</i> within arthropod‐derived cells" @default.
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• W2077510150 doi "https://doi.org/10.1111/j.1462-2920.2009.01875.x" @default.
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