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• W2103229523 abstract "ABSTRACT Macrophages are key mediators of antimicrobial defense and innate immunity. Innate intracellular defense mechanisms can be rapidly regulated at the posttranslational level by the coordinated addition and removal of ubiquitin by ubiquitin ligases and deubiquitinases (DUBs). While ubiquitin ligases have been extensively studied, the contribution of DUBs to macrophage innate immune function is incompletely defined. We therefore employed a small molecule DUB inhibitor, WP1130, to probe the role of DUBs in the macrophage response to bacterial infection. Treatment of activated bone marrow-derived macrophages (BMM) with WP1130 significantly augmented killing of the intracellular bacterial pathogen Listeria monocytogenes . WP1130 also induced killing of phagosome-restricted bacteria, implicating a bactericidal mechanism associated with the phagosome, such as the inducible nitric oxide synthase (iNOS). WP1130 had a minimal antimicrobial effect in macrophages lacking iNOS, indicating that iNOS is an effector mechanism for WP1130-mediated bacterial killing. Although overall iNOS levels were not notably different, we found that WP1130 significantly increased colocalization of iNOS with the Listeria -containing phagosome during infection. Taken together, our data indicate that the deubiquitinase inhibitor WP1130 increases bacterial killing in macrophages by enhancing iNOS localization to the phagosome and suggest a potential role for ubiquitin regulation in iNOS trafficking." @default.
• W2103229523 created "2016-06-24" @default.
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• W2103229523 date "2011-12-01" @default.
• W2103229523 modified "2023-09-26" @default.
• W2103229523 title "A Small Molecule Deubiquitinase Inhibitor Increases Localization of Inducible Nitric Oxide Synthase to the Macrophage Phagosome and Enhances Bacterial Killing" @default.
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• W2103229523 doi "https://doi.org/10.1128/iai.05456-11" @default.
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