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Jamwal A, Colomb F, McSorley HJ, Higgins MK. Structural basis for IL-33 recognition and its antagonism by the helminth effector protein HpARI2. Nat Commun 2024; 15:5226. [PMID: 38890291 PMCID: PMC11189471 DOI: 10.1038/s41467-024-49550-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 06/06/2024] [Indexed: 06/20/2024] Open
Abstract
IL-33 plays a significant role in inflammation, allergy, and host defence against parasitic helminths. The model gastrointestinal nematode Heligmosomoides polygyrus bakeri secretes the Alarmin Release Inhibitor HpARI2, an effector protein that suppresses protective immune responses and asthma in its host by inhibiting IL-33 signalling. Here we reveal the structure of HpARI2 bound to mouse IL-33. HpARI2 contains three CCP-like domains, and we show that it contacts IL-33 primarily through the second and third of these. A large loop which emerges from CCP3 directly contacts IL-33 and structural comparison shows that this overlaps with the binding site on IL-33 for its receptor, ST2, preventing formation of a signalling complex. Truncations of HpARI2 which lack the large loop from CCP3 are not able to block IL-33-mediated signalling in a cell-based assay and in an in vivo female mouse model of asthma. This shows that direct competition between HpARI2 and ST2 is responsible for suppression of IL-33-dependent responses.
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Affiliation(s)
- Abhishek Jamwal
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK
- Kavli Institute for Nanoscience Discovery, Dorothy Crowfoot Hodgkin Building, University of Oxford, South Parks Rd, Oxford, OX1 3QU, UK
| | - Florent Colomb
- Division of Cell Signalling and Immunology, School of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, UK
| | - Henry J McSorley
- Division of Cell Signalling and Immunology, School of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, UK.
| | - Matthew K Higgins
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK.
- Kavli Institute for Nanoscience Discovery, Dorothy Crowfoot Hodgkin Building, University of Oxford, South Parks Rd, Oxford, OX1 3QU, UK.
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Colomb F, Ogunkanbi A, Jamwal A, Dong B, Maizels RM, Finney CAM, Wasmuth JD, Higgins MK, McSorley HJ. IL-33-binding HpARI family homologues with divergent effects in suppressing or enhancing type 2 immune responses. Infect Immun 2024; 92:e0039523. [PMID: 38294241 PMCID: PMC10929406 DOI: 10.1128/iai.00395-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 12/27/2023] [Indexed: 02/01/2024] Open
Abstract
HpARI is an immunomodulatory protein secreted by the intestinal nematode Heligmosomoides polygyrus bakeri, which binds and blocks IL-33. Here, we find that the H. polygyrus bakeri genome contains three HpARI family members and that these have different effects on IL-33-dependent responses in vitro and in vivo, with HpARI1+2 suppressing and HpARI3 amplifying these responses. All HpARIs have sub-nanomolar affinity for mouse IL-33; however, HpARI3 does not block IL-33-ST2 interactions. Instead, HpARI3 stabilizes IL-33, increasing the half-life of the cytokine and amplifying responses to it in vivo. Together, these data show that H. polygyrus bakeri secretes a family of HpARI proteins with both overlapping and distinct functions, comprising a complex immunomodulatory arsenal of host-targeted proteins.
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Affiliation(s)
- Florent Colomb
- Division of Cell Signalling and Immunology, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Adefunke Ogunkanbi
- Division of Cell Signalling and Immunology, School of Life Sciences, University of Dundee, Dundee, United Kingdom
- Department of Biology, University of York, York, United Kingdom
| | - Abhishek Jamwal
- Department of Biochemistry, University of Oxford, Oxford, United Kingdom
- Kavli Institute for Nanoscience Discovery and Dorothy Crowfoot Hodgkin Building, University of Oxford, Oxford, United Kingdom
| | - Beverly Dong
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, Alberta, Canada
- Host-Parasite Interactions Research Training Network, University of Calgary, Calgary, Alberta, Canada
| | - Rick M. Maizels
- Wellcome Centre for Integrative Parasitology, School of Infection and Immunity, University of Glasgow, Glasgow, United Kingdom
| | - Constance A. M. Finney
- Department of Biological Sciences, Faculty of Science, University of Calgary, Calgary, Alberta, Canada
- Host-Parasite Interactions Research Training Network, University of Calgary, Calgary, Alberta, Canada
| | - James D. Wasmuth
- Host-Parasite Interactions Research Training Network, University of Calgary, Calgary, Alberta, Canada
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Matthew K. Higgins
- Department of Biochemistry, University of Oxford, Oxford, United Kingdom
- Kavli Institute for Nanoscience Discovery and Dorothy Crowfoot Hodgkin Building, University of Oxford, Oxford, United Kingdom
| | - Henry J. McSorley
- Division of Cell Signalling and Immunology, School of Life Sciences, University of Dundee, Dundee, United Kingdom
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Lenz B, Ehrens A, Ajendra J, Risch F, Gal J, Neumann AL, Reichwald JJ, Strutz W, McSorley HJ, Martin C, Hoerauf A, Hübner MP. Repeated sensitization of mice with microfilariae of Litomosoides sigmodontis induces pulmonary eosinophilia in an IL-33-dependent manner. PLoS Pathog 2024; 20:e1012071. [PMID: 38457461 PMCID: PMC10954174 DOI: 10.1371/journal.ppat.1012071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 03/20/2024] [Accepted: 02/24/2024] [Indexed: 03/10/2024] Open
Abstract
BACKGROUND Eosinophilia is a hallmark of helminth infections and eosinophils are essential in the protective immune responses against helminths. Nevertheless, the distinct role of eosinophils during parasitic filarial infection, allergy and autoimmune disease-driven pathology is still not sufficiently understood. In this study, we established a mouse model for microfilariae-induced eosinophilic lung disease (ELD), a manifestation caused by eosinophil hyper-responsiveness within the lung. METHODS Wild-type (WT) BALB/c mice were sensitized with dead microfilariae (MF) of the rodent filarial nematode Litomosoides sigmodontis three times at weekly intervals and subsequently challenged with viable MF to induce ELD. The resulting immune response was compared to non-sensitized WT mice as well as sensitized eosinophil-deficient dblGATA mice using flow cytometry, lung histology and ELISA. Additionally, the impact of IL-33 signaling on ELD development was investigated using the IL-33 antagonist HpARI2. RESULTS ELD-induced WT mice displayed an increased type 2 immune response in the lung with increased frequencies of eosinophils, alternatively activated macrophages and group 2 innate lymphoid cells, as well as higher peripheral blood IgE, IL-5 and IL-33 levels in comparison to mice challenged only with viable MF or PBS. ELD mice had an increased MF retention in lung tissue, which was in line with an enhanced MF clearance from peripheral blood. Using eosinophil-deficient dblGATA mice, we demonstrate that eosinophils are essentially involved in driving the type 2 immune response and retention of MF in the lung of ELD mice. Furthermore, we demonstrate that IL-33 drives eosinophil activation in vitro and inhibition of IL-33 signaling during ELD induction reduces pulmonary type 2 immune responses, eosinophil activation and alleviates lung lacunarity. In conclusion, we demonstrate that IL-33 signaling is essentially involved in MF-induced ELD development. SUMMARY Our study demonstrates that repeated sensitization of BALB/c mice with L. sigmodontis MF induces pulmonary eosinophilia in an IL-33-dependent manner. The newly established model recapitulates the characteristic features known to occur during eosinophilic lung diseases (ELD) such as human tropical pulmonary eosinophilia (TPE), which includes the retention of microfilariae in the lung tissue and induction of pulmonary eosinophilia and type 2 immune responses. Our study provides compelling evidence that IL-33 drives eosinophil activation during ELD and that blocking IL-33 signaling using HpARI2 reduces eosinophil activation, eosinophil accumulation in the lung tissue, suppresses type 2 immune responses and mitigates the development of structural damage to the lung. Consequently, IL-33 is a potential therapeutic target to reduce eosinophil-mediated pulmonary pathology.
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Affiliation(s)
- Benjamin Lenz
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
| | - Alexandra Ehrens
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
- German Center for Infection Research (DZIF), partner site Bonn-Cologne, Bonn, Germany
| | - Jesuthas Ajendra
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
| | - Frederic Risch
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
| | - Joséphine Gal
- Unité Molécules de Communication et Adaptation des Microorganismes (MCAM, UMR 7245), Equipe Parasites et Protistes Libres, Muséum National d’Histoire Naturelle, CNRS; CP52, Paris, France
| | - Anna-Lena Neumann
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
| | - Julia J. Reichwald
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
| | - Wiebke Strutz
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
| | - Henry J. McSorley
- Division of Cell Signaling and Immunology, School of Life Sciences, University of Dundee, Dundee, United Kingdom
| | - Coralie Martin
- Unité Molécules de Communication et Adaptation des Microorganismes (MCAM, UMR 7245), Equipe Parasites et Protistes Libres, Muséum National d’Histoire Naturelle, CNRS; CP52, Paris, France
| | - Achim Hoerauf
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
- German Center for Infection Research (DZIF), partner site Bonn-Cologne, Bonn, Germany
| | - Marc P. Hübner
- Institute for Medical Microbiology, Immunology and Parasitology, University Hospital Bonn, Bonn, Germany
- German Center for Infection Research (DZIF), partner site Bonn-Cologne, Bonn, Germany
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4
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Breloer M, Linnemann L. Strongyloides ratti infection in mice: immune response and immune modulation. Philos Trans R Soc Lond B Biol Sci 2024; 379:20220440. [PMID: 38008111 PMCID: PMC10676808 DOI: 10.1098/rstb.2022.0440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 05/09/2023] [Indexed: 11/28/2023] Open
Abstract
Strongyloides ratti is a natural parasite of wild rats and most laboratory mouse strains are also fully permissive. The infection can be divided into three distinct phases: the tissue migration of the infective third stage larvae during the first two days, the early intestinal establishment of S. ratti parasites molting to adults on days three to six and the later intestinal parasitic phase until the end of infection. Immunocompetent mice terminate the S. ratti infection after one month and are semi-resistant to a second infection. Employing the powerful tools of mouse immunology has facilitated a detailed analysis of the initiation, execution and regulation of the immune response to S. ratti. Here we review the information collected to date on the protective immune response to migrating S. ratti larvae in tissues and to adult parasites in the intestine. We show that depending on the phase of infection, a site-specific portfolio of immune effector mechanisms is required for infection control. In addition, we summarize the strategies employed by S. ratti to evade the immune system and survive long enough in its host to replicate despite an effective immune response. Selected murine studies using the closely related Strongyloides venezuelensis will be discussed. This article is part of the Theo Murphy meeting issue 'Strongyloides: omics to worm-free populations'.
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Affiliation(s)
- Minka Breloer
- Section of Molecular Biology and Immunology, Bernhard Nocht Institute for Tropical Medicine, Hamburg 20359, Germany
- Department of Biology, University of Hamburg, Hamburg 20156, Germany
| | - Lara Linnemann
- Section of Molecular Biology and Immunology, Bernhard Nocht Institute for Tropical Medicine, Hamburg 20359, Germany
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5
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Curren B, Ahmed T, Howard DR, Ashik Ullah M, Sebina I, Rashid RB, Al Amin Sikder M, Namubiru P, Bissell A, Ngo S, Jackson DJ, Toussaint M, Edwards MR, Johnston SL, McSorley HJ, Phipps S. IL-33-induced neutrophilic inflammation and NETosis underlie rhinovirus-triggered exacerbations of asthma. Mucosal Immunol 2023; 16:671-684. [PMID: 37506849 DOI: 10.1016/j.mucimm.2023.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 06/04/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023]
Abstract
Rhinovirus-induced neutrophil extracellular traps (NETs) contribute to acute asthma exacerbations; however, the molecular factors that trigger NETosis in this context remain ill-defined. Here, we sought to implicate a role for IL-33, an epithelial cell-derived alarmin rapidly released in response to infection. In mice with chronic experimental asthma (CEA), but not naïve controls, rhinovirus inoculation induced an early (1 day post infection; dpi) inflammatory response dominated by neutrophils, neutrophil-associated cytokines (IL-1α, IL-1β, CXCL1), and NETosis, followed by a later, type-2 inflammatory phase (3-7 dpi), characterised by eosinophils, elevated IL-4 levels, and goblet cell hyperplasia. Notably, both phases were ablated by HpARI (Heligmosomoides polygyrus Alarmin Release Inhibitor), which blocks IL-33 release and signalling. Instillation of exogenous IL-33 recapitulated the rhinovirus-induced early phase, including the increased presence of NETs in the airway mucosa, in a PAD4-dependent manner. Ex vivo IL-33-stimulated neutrophils from mice with CEA, but not naïve mice, underwent NETosis and produced greater amounts of IL-1α/β, IL-4, and IL-5. In nasal samples from rhinovirus-infected people with asthma, but not healthy controls, IL-33 levels correlated with neutrophil elastase and dsDNA. Our findings suggest that IL-33 blockade ameliorates the severity of an asthma exacerbation by attenuating neutrophil recruitment and the downstream generation of NETs.
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Affiliation(s)
- Bodie Curren
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia; School of Biomedical Sciences, The University of Queensland, Queensland 4072, Australia
| | - Tufael Ahmed
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia; School of Biomedical Sciences, Queensland University of Technology, Queensland 4000, Australia
| | - Daniel R Howard
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia; School of Biomedical Sciences, The University of Queensland, Queensland 4072, Australia
| | - Md Ashik Ullah
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia
| | - Ismail Sebina
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia; School of Biomedical Sciences, The University of Queensland, Queensland 4072, Australia; School of Biomedical Sciences, Queensland University of Technology, Queensland 4000, Australia
| | - Ridwan B Rashid
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia; School of Biomedical Sciences, The University of Queensland, Queensland 4072, Australia
| | - Md Al Amin Sikder
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia; School of Biomedical Sciences, The University of Queensland, Queensland 4072, Australia
| | - Patricia Namubiru
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia; School of Biomedical Sciences, The University of Queensland, Queensland 4072, Australia
| | - Alec Bissell
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia
| | - Sylvia Ngo
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia
| | - David J Jackson
- School of Immunology & Microbial Sciences, King's College London, London, UK; National Heart and Lung Institute, Imperial College London, London, UK
| | - Marie Toussaint
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Michael R Edwards
- National Heart and Lung Institute, Imperial College London, London, UK
| | | | - Henry J McSorley
- Division of Cell Signalling and Immunology, School of Life Sciences, University of Dundee, Dundee, UK
| | - Simon Phipps
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia; School of Biomedical Sciences, The University of Queensland, Queensland 4072, Australia; School of Biomedical Sciences, Queensland University of Technology, Queensland 4000, Australia; Australian Infectious Diseases Research Centre, The University of Queensland, 4072 Queensland, Australia.
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6
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Wang Y, He C, Xin S, Liu X, Zhang S, Qiao B, Shang H, Gao L, Xu J. A Deep View of the Biological Property of Interleukin-33 and Its Dysfunction in the Gut. Int J Mol Sci 2023; 24:13504. [PMID: 37686309 PMCID: PMC10487440 DOI: 10.3390/ijms241713504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 08/19/2023] [Accepted: 08/25/2023] [Indexed: 09/10/2023] Open
Abstract
Intestinal diseases have always posed a serious threat to human health, with inflammatory bowel disease (IBD) being one of them. IBD is an autoimmune disease characterized by chronic inflammation, including ulcerative colitis (UC) and Crohn's disease (CD). The "alarm" cytokine IL-33, which is intimately associated with Th2 immunity, is a highly potent inflammatory factor that is considered to have dual functions-operating as both a pro-inflammatory cytokine and a transcriptional regulator. IL-33 has been shown to play a crucial role in both the onset and development of IBD. Therefore, this review focuses on the pathogenesis of IBD, the major receptor cell types, and the activities of IL-33 in innate and adaptive immunity, as well as its underlying mechanisms and conflicting conclusions in IBD. We have also summarized different medicines targeted to IL-33-associated diseases. Furthermore, we have emphasized the role of IL-33 in gastrointestinal cancer and parasitic infections, giving novel prospective therapeutic utility in the future application of IL-33.
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Affiliation(s)
- Yi Wang
- Department of Clinical Medicine, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China; (Y.W.); (S.Z.); (B.Q.)
| | - Chengwei He
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China; (C.H.); (S.X.); (X.L.)
| | - Shuzi Xin
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China; (C.H.); (S.X.); (X.L.)
| | - Xiaohui Liu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China; (C.H.); (S.X.); (X.L.)
| | - Sitian Zhang
- Department of Clinical Medicine, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China; (Y.W.); (S.Z.); (B.Q.)
| | - Boya Qiao
- Department of Clinical Medicine, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China; (Y.W.); (S.Z.); (B.Q.)
| | - Hongwei Shang
- Experimental Center for Morphological Research Platform, Capital Medical University, Beijing 100069, China;
| | - Lei Gao
- Department of Intelligent Medical Engineering, School of Biomedical Engineering, Capital Medical University, Beijing 100069, China
| | - Jingdong Xu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China; (C.H.); (S.X.); (X.L.)
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7
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Chauché C, Rasid O, Donachie A, McManus CM, Löser S, Campion T, Richards J, Smyth DJ, McSorley HJ, Maizels RM. Suppression of airway allergic eosinophilia by Hp-TGM, a helminth mimic of TGF-β. Immunology 2022; 167:197-211. [PMID: 35758054 PMCID: PMC9885513 DOI: 10.1111/imm.13528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 06/20/2022] [Indexed: 02/02/2023] Open
Abstract
Type 2-high asthma is a chronic inflammatory disease of the airways which is increasingly prevalent in countries where helminth parasite infections are rare, and characterized by T helper 2 (Th2)-dependent accumulation of eosinophils in the lungs. Regulatory cytokines such as TGF-β can restrain inflammatory reactions, dampen allergic Th2 responses, and control eosinophil activation. The murine helminth parasite Heligmosomoides polygyrus releases a TGF-β mimic (Hp-TGM) that replicates the biological and functional properties of TGF-β despite bearing no structural similarity to the mammalian protein. Here, we investigated if Hp-TGM could alleviate allergic airway inflammation in mice exposed to Alternaria alternata allergen, house dust mite (HDM) extract or alum-adjuvanted ovalbumin protein (OVA). Intranasal administration of Hp-TGM during Alternaria exposure sharply reduced airway and lung tissue eosinophilia along with bronchoalveolar lavage fluid IL-5 and lung IL-33 cytokine levels at 24 h. The protective effect of Hp-TGM on airway eosinophilia was also obtained in the longer T-cell mediated models of HDM or OVA sensitisation with significant inhibition of eotaxin-1, IL-4 and IL-13 responses depending on the model and time-point. Hp-TGM was also protective when administered parenterally either when given at the time of allergic sensitisation or during airway allergen challenge. This project has taken the first steps in identifying the role of Hp-TGM in allergic asthma and highlighted its ability to control lung inflammation and allergic pathology. Future research will investigate the mode of action of Hp-TGM against airway allergic eosinophilia, and further explore its potential to be developed as a biotherapeutic in allergic asthma.
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Affiliation(s)
- Caroline Chauché
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK,Centre for Inflammation ResearchUniversity of Edinburgh, Queen's Medical Research InstituteEdinburghUK
| | - Orhan Rasid
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK
| | - Anne‐Marie Donachie
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK
| | - Caitlin M. McManus
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK
| | - Stephan Löser
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK
| | - Tiffany Campion
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK
| | - Josh Richards
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK,Division of Cell Signalling and ImmunologySchool of Life Sciences, Wellcome Trust Building, University of DundeeDundeeUK
| | - Danielle J. Smyth
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK,Division of Cell Signalling and ImmunologySchool of Life Sciences, Wellcome Trust Building, University of DundeeDundeeUK
| | - Henry J. McSorley
- Division of Cell Signalling and ImmunologySchool of Life Sciences, Wellcome Trust Building, University of DundeeDundeeUK
| | - Rick M. Maizels
- Wellcome Centre for Integrative ParasitologyInstitute of Infection, Immunity and Inflammation, University of GlasgowGlasgowUK
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8
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Mukundan A, Byeon CH, Hinck CS, Cunningham K, Campion T, Smyth DJ, Maizels RM, Hinck AP. Convergent evolution of a parasite-encoded complement control protein-scaffold to mimic binding of mammalian TGF-β to its receptors, TβRI and TβRII. J Biol Chem 2022; 298:101994. [PMID: 35500648 PMCID: PMC9163516 DOI: 10.1016/j.jbc.2022.101994] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 04/22/2022] [Accepted: 04/23/2022] [Indexed: 11/02/2022] Open
Abstract
The mouse intestinal helminth Heligmosomoides polygyrus modulates host immune responses by secreting a transforming growth factor (TGF)-β mimic (TGM), to expand the population of Foxp3+ Tregs. TGM comprises five complement control protein (CCP)-like domains, designated D1-D5. Though lacking homology to TGF-β, TGM binds directly to the TGF-β receptors TβRI and TβRII and stimulates the differentiation of naïve T-cells into Tregs. However, the molecular determinants of binding are unclear. Here, we used surface plasmon resonance, isothermal calorimetry, NMR spectroscopy, and mutagenesis to investigate how TGM binds the TGF-β receptors. We demonstrate that binding is modular, with D1-D2 binding to TβRI and D3 binding to TβRII. D1-D2 and D3 were further shown to compete with TGF-β(TβRII)2 and TGF-β for binding to TβRI and TβRII, respectively. The solution structure of TGM-D3 revealed that TGM adopts a CCP-like fold but is also modified to allow the C-terminal strand to diverge, leading to an expansion of the domain and opening potential interaction surfaces. TGM-D3 also incorporates a long structurally ordered hypervariable loop, adding further potential interaction sites. Through NMR shift perturbations and binding studies of TGM-D3 and TβRII variants, TGM-D3 was shown to occupy the same site of TβRII as bound by TGF-β using both a novel interaction surface and the hypervariable loop. These results, together with the identification of other secreted CCP-like proteins with immunomodulatory activity in H. polygyrus, suggest that TGM is part of a larger family of evolutionarily plastic parasite effector molecules that mediate novel interactions with their host.
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Affiliation(s)
- Ananya Mukundan
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania USA
| | - Chang-Hyeock Byeon
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania USA
| | - Cynthia S Hinck
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania USA
| | - Kyle Cunningham
- Wellcome Centre for Integrative Parasitology, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, United Kingdom
| | - Tiffany Campion
- Wellcome Centre for Integrative Parasitology, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, United Kingdom
| | - Danielle J Smyth
- Wellcome Centre for Integrative Parasitology, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, United Kingdom
| | - Rick M Maizels
- Wellcome Centre for Integrative Parasitology, Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, United Kingdom
| | - Andrew P Hinck
- Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania USA.
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9
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Trained immunity in type 2 immune responses. Mucosal Immunol 2022; 15:1158-1169. [PMID: 36065058 PMCID: PMC9705254 DOI: 10.1038/s41385-022-00557-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 07/27/2022] [Accepted: 08/08/2022] [Indexed: 02/04/2023]
Abstract
Immunological memory of innate immune cells, also termed "trained immunity", allows for cross-protection against distinct pathogens, but may also drive chronic inflammation. Recent studies have shown that memory responses associated with type 2 immunity do not solely rely on adaptive immune cells, such as T- and B cells, but also involve the innate immune system and epithelial cells. Memory responses have been described for monocytes, macrophages and airway epithelial cells of asthmatic patients as well as for macrophages and group 2 innate lymphoid cells (ILC2) from allergen-sensitized or helminth-infected mice. The metabolic and epigenetic mechanisms that mediate allergen- or helminth-induced reprogramming of innate immune cells are only beginning to be uncovered. Trained immunity has been implicated in helminth-driven immune regulation and allergen-specific immunotherapy, suggesting its exploitation in future therapies. Here, we discuss recent advances and key remaining questions regarding the mechanisms and functions of trained type 2 immunity in infection and inflammation.
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Cayrol C. IL-33, an Alarmin of the IL-1 Family Involved in Allergic and Non Allergic Inflammation: Focus on the Mechanisms of Regulation of Its Activity. Cells 2021; 11:cells11010107. [PMID: 35011670 PMCID: PMC8750818 DOI: 10.3390/cells11010107] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 12/15/2021] [Accepted: 12/20/2021] [Indexed: 02/04/2023] Open
Abstract
Interleukin-33 (IL-33) is a member of the interleukin-1 (IL-1) family that is expressed in the nuclei of endothelial and epithelial cells of barrier tissues, among others. It functions as an alarm signal that is released upon tissue or cellular injury. IL-33 plays a central role in the initiation and amplification of type 2 innate immune responses and allergic inflammation by activating various target cells expressing its ST2 receptor, including mast cells and type 2 innate lymphoid cells. Depending on the tissue environment, IL-33 plays a wide variety of roles in parasitic and viral host defense, tissue repair and homeostasis. IL-33 has evolved a variety of sophisticated regulatory mechanisms to control its activity, including nuclear sequestration and proteolytic processing. It is involved in many diseases, including allergic, inflammatory and infectious diseases, and is a promising therapeutic target for the treatment of severe asthma. In this review, I will summarize the literature around this fascinating pleiotropic cytokine. In the first part, I will describe the basics of IL-33, from the discovery of interleukin-33 to its function, including its expression, release and signaling pathway. The second part will be devoted to the regulation of IL-33 protein leading to its activation or inactivation.
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Affiliation(s)
- Corinne Cayrol
- Institut de Pharmacologie et Biologie Structurale, IPBS, Université de Toulouse, CNRS, UPS, 31077 Toulouse, France
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11
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Could Interleukin-33 (IL-33) Govern the Outcome of an Equine Influenza Virus Infection? Learning from Other Species. Viruses 2021; 13:v13122519. [PMID: 34960788 PMCID: PMC8704309 DOI: 10.3390/v13122519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/04/2021] [Accepted: 12/13/2021] [Indexed: 11/16/2022] Open
Abstract
Influenza A viruses (IAVs) are important respiratory pathogens of horses and humans. Infected individuals develop typical respiratory disorders associated with the death of airway epithelial cells (AECs) in infected areas. Virulence and risk of secondary bacterial infections vary among IAV strains. The IAV non-structural proteins, NS1, PB1-F2, and PA-X are important virulence factors controlling AEC death and host immune responses to viral and bacterial infection. Polymorphism in these proteins impacts their function. Evidence from human and mouse studies indicates that upon IAV infection, the manner of AEC death impacts disease severity. Indeed, while apoptosis is considered anti-inflammatory, necrosis is thought to cause pulmonary damage with the release of damage-associated molecular patterns (DAMPs), such as interleukin-33 (IL-33). IL-33 is a potent inflammatory mediator released by necrotic cells, playing a crucial role in anti-viral and anti-bacterial immunity. Here, we discuss studies in human and murine models which investigate how viral determinants and host immune responses control AEC death and subsequent lung IL-33 release, impacting IAV disease severity. Confirming such data in horses and improving our understanding of early immunologic responses initiated by AEC death during IAV infection will better inform the development of novel therapeutic or vaccine strategies designed to protect life-long lung health in horses and humans, following a One Health approach.
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12
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IL-33: A central cytokine in helminth infections. Semin Immunol 2021; 53:101532. [PMID: 34823996 DOI: 10.1016/j.smim.2021.101532] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 11/10/2021] [Accepted: 11/12/2021] [Indexed: 02/06/2023]
Abstract
IL-33 is an alarmin cytokine which has been implicated in allergy, fibrosis, inflammation, tumorigenesis, metabolism, and homeostasis. However, amongst its strongest roles are in helminth infections, where IL-33 usually (but not always) is central to induction of an effective anti-parasitic immune response. In this review, we will summarise the literature around this fascinating cytokine, its activity on immune and non-immune cells, the unique (and sometimes counterintuitive) responses it induces, and how it can coordinate the immune response during infections by parasitic helminths. Finally, we will summarise some of the ways that parasites have developed to modulate the IL-33 pathway for their own benefit.
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13
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Deckers J, Marsland BJ, von Mutius E. Protection against allergies: Microbes, immunity, and the farming effect. Eur J Immunol 2021; 51:2387-2398. [PMID: 34415577 DOI: 10.1002/eji.202048938] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 07/08/2021] [Accepted: 08/17/2021] [Indexed: 12/19/2022]
Abstract
The prevalence of asthma and other allergic diseases has rapidly increased in "Westernized" countries over recent decades. This rapid increase suggests the involvement of environmental factors, behavioral changes or lifestyle, rather than genetic drift. It has become increasingly clear that the microbiome plays a key role in educating the host immune system and, thus, regulation of disease susceptibility. This review will focus on recent advances uncovering immunological and microbial mechanisms that protect against allergies, in particular, within the context of a farming environment. A whole body of epidemiological data disclosed the nature of the protective exposures in a farm. Current evidence points toward an important role of the host microbiome in setting an immunological equilibrium that determines progression toward, or protection against allergic diseases. Conclusive mechanistic insights on how microbial exposures prevent from developing allergic diseases in humans are still lacking but findings from experimental models reveal plausible immunological mechanisms. Gathering further knowledge on these mechanisms and confirming their relevance in humans is of great importance to develop preventive strategies for children at risk of developing allergies.
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Affiliation(s)
- Julie Deckers
- Laboratory of Immunoregulation and Mucosal Immunology, VIB Center for Inflammation Research, Ghent (Zwijnaarde), Belgium.,Department of Internal Medicine and Pediatrics, Ghent University, Ghent, Belgium
| | - Benjamin J Marsland
- Department of Immunology and Pathology, Central Clinical School, Monash University, Melbourne, Victoria, Australia
| | - Erika von Mutius
- Institute for Asthma and Allergy Prevention, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.,German Center for Lung Research, München, Germany.,Dr. von Hauner Children's Hospital, Ludwig Maximilian University of Munich, Munich, Germany
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14
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Montaño KJ, Cuéllar C, Sotillo J. Rodent Models for the Study of Soil-Transmitted Helminths: A Proteomics Approach. Front Cell Infect Microbiol 2021; 11:639573. [PMID: 33968800 PMCID: PMC8100317 DOI: 10.3389/fcimb.2021.639573] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 03/29/2021] [Indexed: 12/30/2022] Open
Abstract
Soil-transmitted helminths (STH) affect hundreds of millions worldwide and are some of the most important neglected tropical diseases in terms of morbidity. Due to the difficulty in studying STH human infections, rodent models have become increasingly used, mainly because of their similarities in life cycle. Ascaris suum and Trichuris muris have been proven appropriate and low maintenance models for the study of ascariasis and trichuriasis. In the case of hookworms, despite most of the murine models do not fully reproduce the life cycle of Necator americanus, their proteomic similarity makes them highly suitable for the development of novel vaccine candidates and for the study of hookworm biological features. Furthermore, these models have been helpful in elucidating some basic aspects of our immune system, and are currently being used by numerous researchers to develop novel molecules with immunomodulatory proteins. Herein we review the similarities in the proteomic composition between Nippostrongylus brasiliensis, Heligmosomoides polygyrus bakeri and Trichuris muris and their respective human counterpart with a focus on the vaccine candidates and immunomodulatory proteins being currently studied.
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Affiliation(s)
- Karen J Montaño
- Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain
| | - Carmen Cuéllar
- Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad Complutense, Madrid, Spain
| | - Javier Sotillo
- Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain
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IL-33 facilitates rapid expulsion of the parasitic nematode Strongyloides ratti from the intestine via ILC2- and IL-9-driven mast cell activation. PLoS Pathog 2020; 16:e1009121. [PMID: 33351862 PMCID: PMC7787685 DOI: 10.1371/journal.ppat.1009121] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 01/06/2021] [Accepted: 11/02/2020] [Indexed: 02/06/2023] Open
Abstract
Parasitic helminths are sensed by the immune system via tissue-derived alarmins that promote the initiation of the appropriate type 2 immune responses. Here we establish the nuclear alarmin cytokine IL-33 as a non-redundant trigger of specifically IL-9-driven and mast cell-mediated immunity to the intestinal parasite Strongyloides ratti. Blockade of endogenous IL-33 using a helminth-derived IL-33 inhibitor elevated intestinal parasite burdens in the context of reduced mast cell activation while stabilization of endogenous IL-33 or application of recombinant IL-33 reciprocally reduced intestinal parasite burdens and increased mast cell activation. Using gene-deficient mice, we show that application of IL-33 triggered rapid mast cell-mediated expulsion of parasites directly in the intestine, independent of the adaptive immune system, basophils, eosinophils or Gr-1+ cells but dependent on functional IL-9 receptor and innate lymphoid cells (ILC). Thereby we connect the described axis of IL-33-mediated ILC2 expansion to the rapid initiation of IL-9-mediated and mast cell-driven intestinal anti-helminth immunity.
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