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• W982636699 abstract "Francisella tularensis is the causative agent of tularemia and is categorized by the CDC as a Tier 1 select agent. This gram-negative, facultative-intracellular bacterium infects macrophages by escaping the phagosome and replicating with high efficacy in the cytosol. Multiple virulence factors, including capsule and lipopolysaccharide (LPS), are expressed by F. tularensis. Biosynthesis of capsule and LPS O-antigen requires the same O-antigen biosynthesis gene cluster and, together, expression of capsule and O-antigen confer serum resistance. Mutations in the O-antigen biosynthesis gene cluster not only result in serum sensitivity, but also attenuate the ability to cause disease in vivo. In addition to changes in F. tularensis virulence, individual capsule and O-antigen mutants appear to have distinct intracellular phenotypes in macrophages. As previously shown by Lindemann et al. (2011), the capsule and O-antigen mutants FTT1236, FTT1237, and FTT1238 all replicated in human monocyte derived macrophages (MDMs) up to 16 hr and then ceased to replicate after that. This is hypothesized to be due to MDM cytotoxicity. In contrast, Raynaud et al. (2007) showed that the capsule and O-antigen mutant wbtA completely lacked replication in J774 macrophages, the reason for which has not been identified. A potential explanation for the loss of F. tularensis capsule and O-antigen mutant replication is capture and degradation by the host cell’s autophagy pathway. Capture and degradation by autophagy is an accepted innate immune response to many intracellular pathogens. When small subpopulations of bacteria that normally replicate in membrane-bound vacuoles become cytosolic, such as Mycobacterium tuberculosis and Salmonella enterica serovar Typhimurium, they are targeted to forming autophagosomes through ubiquitination and binding of autophagy receptors. Pathogens have also developed methods to circumvent recognition and degradation by autophagy. Since F. tularensis replicates in the cytosol, it stands to reason that it has a" @default.
• W982636699 created "2016-06-24" @default.
• W982636699 creator A5073604804 @default.
• W982636699 date "2018-11-29" @default.
• W982636699 modified "2023-09-27" @default.
• W982636699 title "Fate of Francisella tularensis capsule and O-antigen mutants in human macrophages" @default.
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• W982636699 doi "https://doi.org/10.17077/etd.2em0fk5z" @default.
• W982636699 hasPublicationYear "2018" @default.
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