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Sborgi L, Ude J, Dick MS, Vesin J, Chambon M, Turcatti G, Broz P, Hiller S. Assay for high-throughput screening of inhibitors of the ASC-PYD inflammasome core filament. Cell Stress 2018; 2:82-90. [PMID: 31225471 PMCID: PMC6551747 DOI: 10.15698/cst2018.04.131] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The protein ASC is a central component of most inflammasome complexes, forming functional oligomeric filaments that activate large amounts of pro-caspase-1 for further IL-1β processing and the induction of Gasdermin D-dependent cell death. The central role of inflammasomes in the innate immune response pose them as new molecular targets for therapy of diverse acute, chronic and inherited autoinflammatory pathologies. In recent years, an increasing number of molecules were proposed to modulate inflammasome signalling by interacting with different components of inflammasome complexes. However, the difficult in vitro reconstitution of the inflammasome has limited the development of specific on-target biochemical assays for compound activity confirmation and for drug discovery in high throughput screening setups. Here we describe a homogeneous, pH-based ASC oligomerization assay that employs fluorescence anisotropy (FA) to monitor the in vitro filament formation of the PYD domain of human ASC. The absence of additional solubility tags as well as of proteolytic enzymes to initiate the filament reaction makes this assay suitable for testing the direct effect of small molecules on filament formation in high throughput format. The ability of the assay to detect modulators of filament formation was confirmed by using a non-filament forming PYD mutant. The high and reproducible Z’-factor of 0.7 allowed to screen 10,100 compounds by high-throughput screening (HTS) aiming to identify inhibitors of ASC filament. While none of these molecules was able to inhibit ASC filament formation in vitro, the assay is directly amenable to screen other compound classes or validate candidate molecules from other screens.
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Affiliation(s)
- Lorenzo Sborgi
- Biozentrum, University of Basel, Klingelbergstr. 70, 4056 Basel, Switzerland
| | - Johanna Ude
- Biozentrum, University of Basel, Klingelbergstr. 70, 4056 Basel, Switzerland
| | - Mathias S Dick
- Biozentrum, University of Basel, Klingelbergstr. 70, 4056 Basel, Switzerland
| | - Jonathan Vesin
- Biomolecular Screening Facility, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Marc Chambon
- Biomolecular Screening Facility, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Gerardo Turcatti
- Biomolecular Screening Facility, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Petr Broz
- Biozentrum, University of Basel, Klingelbergstr. 70, 4056 Basel, Switzerland
| | - Sebastian Hiller
- Biozentrum, University of Basel, Klingelbergstr. 70, 4056 Basel, Switzerland
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Santos JC, Dick MS, Lagrange B, Degrandi D, Pfeffer K, Yamamoto M, Meunier E, Pelczar P, Henry T, Broz P. LPS targets host guanylate-binding proteins to the bacterial outer membrane for non-canonical inflammasome activation. EMBO J 2018; 37:embj.201798089. [PMID: 29459437 DOI: 10.15252/embj.201798089] [Citation(s) in RCA: 143] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 01/17/2018] [Accepted: 01/19/2018] [Indexed: 01/08/2023] Open
Abstract
Pathogenic and commensal Gram-negative bacteria produce and release outer membrane vesicles (OMVs), which present several surface antigens and play an important role for bacterial pathogenesis. OMVs also modulate the host immune system, which makes them attractive as vaccine candidates. At the cellular level, OMVs are internalized by macrophages and deliver lipopolysaccharide (LPS) into the host cytosol, thus activating the caspase-11 non-canonical inflammasome. Here, we show that OMV-induced inflammasome activation requires TLR4-TRIF signaling, the production of type I interferons, and the action of guanylate-binding proteins (GBPs), both in macrophages and in vivo Mechanistically, we find that isoprenylated GBPs associate with the surface of OMVs or with transfected LPS, indicating that the key factor that determines GBP recruitment to the Gram-negative bacterial outer membranes is LPS itself. Our findings provide new insights into the mechanism by which GBPs target foreign surfaces and reveal a novel function for GBPs in controlling the intracellular detection of LPS derived from extracellular bacteria in the form of OMVs, thus extending their function as a hub between cell-autonomous immunity and innate immunity.
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Affiliation(s)
- José Carlos Santos
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland.,Department of Biochemistry, University of Lausanne, Epalinges, Switzerland
| | - Mathias S Dick
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
| | - Brice Lagrange
- Centre International de Recherche en Infectiologie, Inserm U1111, CNRS, UMR 5308, Université Claude Bernard Lyon-1 Ecole Normale Supérieure, Lyon, France
| | - Daniel Degrandi
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Klaus Pfeffer
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - Masahiro Yamamoto
- Department of Immunoparasitology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Etienne Meunier
- Institute of Pharmacology and Structural Biology (IPBS), University of Toulouse, Toulouse Cedex 04, France
| | - Pawel Pelczar
- Center for Transgenic Models, University of Basel, Basel, Switzerland
| | - Thomas Henry
- Centre International de Recherche en Infectiologie, Inserm U1111, CNRS, UMR 5308, Université Claude Bernard Lyon-1 Ecole Normale Supérieure, Lyon, France
| | - Petr Broz
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland .,Department of Biochemistry, University of Lausanne, Epalinges, Switzerland
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Heilig R, Dick MS, Sborgi L, Meunier E, Hiller S, Broz P. The Gasdermin-D pore acts as a conduit for IL-1β secretion in mice. Eur J Immunol 2018; 48:584-592. [PMID: 29274245 DOI: 10.1002/eji.201747404] [Citation(s) in RCA: 242] [Impact Index Per Article: 40.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 12/08/2017] [Accepted: 12/19/2017] [Indexed: 01/01/2023]
Abstract
The pro-inflammatory cytokine IL-1β is well known for its role in host defense and the initiation of potent inflammatory responses. It is processed from its inactive pro-form by the inflammatory caspase-1 into its mature bioactive form, which is then released from the cell via an unconventional secretion mechanism. Recently, gasdermin-D has been identified as a new target of caspase-1. After proteolytical cleavage of gasdermin-D, the N-terminal fragment induces pyroptosis, a lytic cell death, by forming large permeability pores in the plasma membrane. Here we show using the murine system that gasdermin-D is required for IL-1β secretion by macrophages, dendritic cells and partially in neutrophils, and that secretion is a cell-lysis-independent event. Liposome transport assays in vitro further demonstrate that gasdermin-D pores are large enough to allow the direct release of IL-1β. Moreover, IL-18 and other small soluble cytosolic proteins can also be released in a lysis-independent but gasdermin-D-dependent mode, suggesting that the gasdermin-D pores allow passive the release of cytosolic proteins in a size-dependent manner.
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Affiliation(s)
- Rosalie Heilig
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland.,Department of Biochemistry, University of Lausanne, Epalinges, Switzerland
| | - Mathias S Dick
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
| | - Lorenzo Sborgi
- Focal Area Structural Biology and Biophysics, Biozentrum, University of Basel, Basel, Switzerland
| | - Etienne Meunier
- Institute of Pharmacology and Structural Biology (IPBS), University of Toulouse, France
| | - Sebastian Hiller
- Focal Area Structural Biology and Biophysics, Biozentrum, University of Basel, Basel, Switzerland
| | - Petr Broz
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland.,Department of Biochemistry, University of Lausanne, Epalinges, Switzerland
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Dick MS, Sborgi L, Rühl S, Hiller S, Broz P. Corrigendum: ASC filament formation serves as a signal amplification mechanism for inflammasomes. Nat Commun 2017; 8:15030. [PMID: 28303881 PMCID: PMC5357844 DOI: 10.1038/ncomms15030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Meunier E, Wallet P, Dreier RF, Costanzo S, Anton L, Rühl S, Dussurgey S, Dick MS, Kistner A, Rigard M, Degrandi D, Pfeffer K, Yamamoto M, Henry T, Broz P. Guanylate-binding proteins promote activation of the AIM2 inflammasome during infection with Francisella novicida. Nat Immunol 2015; 16:476-484. [PMID: 25774716 PMCID: PMC4568307 DOI: 10.1038/ni.3119] [Citation(s) in RCA: 260] [Impact Index Per Article: 28.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 02/06/2015] [Indexed: 12/19/2022]
Abstract
The AIM2 inflammasome detects double-stranded DNA in the cytosol and induces caspase-1-dependent pyroptosis as well as release of the inflammatory cytokines IL-1β and IL-18. AIM2 is critical for host defense against DNA viruses and bacteria that replicate in the cytosol, such as Francisella novicida. AIM2 activation by F. novicida requires bacteriolysis, yet whether this process is accidental or a host-driven immune mechanism remained unclear. Using siRNA screening for nearly 500 interferon-stimulated genes, we identified guanylate-binding proteins GBP2 and GBP5 as key AIM2 activators during F. novicida infection. Their prominent role was validated in vitro and in a mouse model of tularemia. Mechanistically, these two GBPs target cytosolic F. novicida and promote bacteriolysis. Thus, besides their role in host defense against vacuolar pathogens, GBPs also facilitate the presentation of ligands by directly attacking cytosolic bacteria.
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Affiliation(s)
- Etienne Meunier
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
| | - Pierre Wallet
- CIRI, Inserm U1111, CNRS UMR 5308, Université Claude Bernard Lyon-1, Ecole Normale Supérieure, Lyon, France
| | - Roland F Dreier
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
| | - Stéphanie Costanzo
- CIRI, Inserm U1111, CNRS UMR 5308, Université Claude Bernard Lyon-1, Ecole Normale Supérieure, Lyon, France
| | - Leonie Anton
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
| | - Sebastian Rühl
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
| | - Sébastien Dussurgey
- SFR Biosciences, UMS344/US8, Inserm, CNRS, Université Claude Bernard Lyon-1, Ecole Normale Supérieure, Lyon, France
| | - Mathias S Dick
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
| | - Anne Kistner
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
| | - Mélanie Rigard
- CIRI, Inserm U1111, CNRS UMR 5308, Université Claude Bernard Lyon-1, Ecole Normale Supérieure, Lyon, France
| | - Daniel Degrandi
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Duesseldorf, Duesseldorf 40225, Germany
| | - Klaus Pfeffer
- Institute of Medical Microbiology and Hospital Hygiene, Heinrich-Heine-University Duesseldorf, Duesseldorf 40225, Germany
| | - Masahiro Yamamoto
- Department of Microbiology and Immunology, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Thomas Henry
- CIRI, Inserm U1111, CNRS UMR 5308, Université Claude Bernard Lyon-1, Ecole Normale Supérieure, Lyon, France
| | - Petr Broz
- Focal Area Infection Biology, Biozentrum, University of Basel, Basel, Switzerland
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Québatte M, Dick MS, Kaever V, Schmidt A, Dehio C. Dual input control: activation of theBartonella henselae VirB/D4 type IV secretion system by the stringent sigma factor RpoH1 and the BatR/BatS two-component system. Mol Microbiol 2013; 90:756-75. [DOI: 10.1111/mmi.12396] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/07/2013] [Indexed: 01/12/2023]
Affiliation(s)
- Maxime Québatte
- Focal Area Infection Biology, Biozentrum; University of Basel; Klingelbergstrasse 70 4056 Basel Switzerland
| | - Mathias S. Dick
- Focal Area Infection Biology, Biozentrum; University of Basel; Klingelbergstrasse 70 4056 Basel Switzerland
| | - Volkhard Kaever
- Research Core Unit for Mass Spectrometry - Metabolomics; Institute of Pharmacology; Hannover Medical School; Hannover Germany
| | - Alexander Schmidt
- Proteomics Core Facility, Biozentrum; University of Basel; Basel Switzerland
| | - Christoph Dehio
- Focal Area Infection Biology, Biozentrum; University of Basel; Klingelbergstrasse 70 4056 Basel Switzerland
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