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A novel role for cell autonomous immunity in inflammasome activation during Gram- negative bacterial infections
Third-party funded project |
Project title |
A novel role for cell autonomous immunity in inflammasome activation during Gram- negative bacterial infections |
Principal Investigator(s) |
Broz, Petr
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Project Members |
Dreier, Roland
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Organisation / Research unit |
Departement Biozentrum / Infection Biology (Broz) |
Project start |
01.04.2014 |
Probable end |
01.04.2019 |
Status |
Completed |
Abstract |
Recognizing the presence of invading pathogens is key to mounting an effective immune response1. The mammalian innate immune system employs several classes of germline-encoded pattern recognition receptors (PRRs) to monitor the extracellular and intracellular compartments of host cells for signs of infection. A subset of these, the NOD-like receptors, detects the presence of pathogens in the cytoplasm and assembles so-called inflammasome complexes, which activate the mammalian cysteine protease caspase-1. Active caspase-1 is a key determinant of inflammation, since it promotes the secretion of pro-inflammaotory cytokines like interleukin (IL)-1b and IL-18, and induces an inflammatory cell death called “pyroptosis”1.
Recently, a novel non-canonical inflammasome pathway has been identified which leads to the activation of caspase-112. We and others have shown that this pathway specifically responds to intracellular Gram-negative bacteria but not to Gram-positive pathogens3,4. Consistently, caspase-11 has been shown to promote lethality in a murine model of Lipopolysaccharaide (LPS)-induced septic shock 2. In line with these observations, it has been recently reported that cytoplasmic LPS is most likely the trigger of the non-canonical inflammasome5.
Interestingly, activation of caspase-11 also requires preceding production of type-I-interferon, indicating an important role for one or several interferon-induced genes in caspase-11 activation 3,4. We have recently carried out a siRNA screen with the goal of defining factors necessary for caspase-11 activation. This led to the identification of a family of interferon-inducible GTPases that control a number of bacteriocidal mechanisms and restrict growth of pathogens in cells6. Based on these data, we propose a novel and original hypothesis in that the cytosolic detection of bacteria by PRRs requires preceding killing of bacteria by interferon-induced cell autonomous defense mechanisms, thus establishing a so-far unrecognized link between these distinct arms of innate immunity. |
Financed by |
University of Basel
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Published results () |
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ID |
Autor(en) |
Titel |
ISSN / ISBN |
Erschienen in |
Art der Publikation |
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2471108 |
Meunier, Etienne; Dick, Mathias S.; Dreier, Roland F.; Schürmann, Nura; Kenzelmann Broz, Daniela; Warming, Søren; Roose-Girma, Merone; Bumann, Dirk; Kayagaki, Nobuhiko; Takeda, Kiyoshi; Yamamoto, Masahiro; Broz, Petr |
Caspase-11 activation requires lysis of pathogen-containing vacuoles by IFN-induced GTPases |
0028-0836 ; 1476-4687 |
Nature |
Publication: JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift) |
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2834776 |
Meunier, Etienne; Broz, Petr |
Interferon-induced guanylate-binding proteins promote cytosolic lipopolysaccharide detection by caspase-11 |
1044-5498 |
DNA and cell biology |
Publication: JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift) |
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13/05/2024
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