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• W1518367075 abstract "Abstract Pathogenicity of many Gram-negative bacteria relies on a type III secretion (T3S) apparatus, which is used for delivery of bacterial effectors into the host cell cytoplasm allowing the bacteria to manipulate host cell cytoskeleton network as well as to interfere with intracellular signaling pathways. In this study, we investigated the potential of the Shigella flexneri T3SA as an in vivo delivery system for biologically active molecules such as cytokines. The anti-inflammatory cytokines IL-10 and IL-1 receptor antagonist (IL-1ra) were genetically fused to the first 30 or 60 residues of the Shigella T3S effector IpaH9.8 or to the first 50 residues of the Yersinia enterocolitica effector YopE and the recombinant fusion proteins were expressed in S. flexneri. YopE50-IL-10, IpaH60-IL-10, and IpaH60-IL-1ra were efficiently secreted via the T3S apparatus of Shigella. Moreover, these recombinant proteins did not impair the invasive ability of the bacteria in vitro. In a murine model, Shigella strains expressing YopE50-IL-10, IpaH60-IL-10, and IpaH60-IL-1ra induced a lower mortality in mice that was associated with reduced inflammation and a restricted localization of bacteria within the lung tissues as compared with wild-type Shigella. Moreover, the level of TNF-α and IL-1β mRNA were reduced in the lungs following infection by IL-10- and IL-1ra-secreting Shigella, respectively. These findings demonstrate that the Shigella T3S apparatus can deliver biologically active cytokines in vivo, thus opening new avenues for the use of attenuated bacteria to deliver proteins for immunomodulation or gene therapy purposes." @default.
• W1518367075 created "2016-06-24" @default.
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• W1518367075 date "2008-03-15" @default.
• W1518367075 modified "2023-10-16" @default.
• W1518367075 title "Delivery of Biologically Active Anti-Inflammatory Cytokines IL-10 and IL-1ra In Vivo by the <i>Shigella</i> Type III Secretion Apparatus" @default.
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• W1518367075 doi "https://doi.org/10.4049/jimmunol.180.6.4292" @default.
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