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Roesner LM, Ernst M, Chen W, Begemann G, Kienlin P, Raulf MK, Lepenies B, Werfel T. Human thioredoxin, a damage-associated molecular pattern and Malassezia-crossreactive autoallergen, modulates immune responses via the C-type lectin receptors Dectin-1 and Dectin-2. Sci Rep 2019; 9:11210. [PMID: 31371767 PMCID: PMC6671947 DOI: 10.1038/s41598-019-47769-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 07/23/2019] [Indexed: 12/27/2022] Open
Abstract
Human thioredoxin (hTrx), which can be secreted from cells upon stress, functions in allergic skin inflammation as a T cell antigen due to homology and cross-reactivity with the fungal allergen Mala s13 of the skin-colonizing yeast Malassezia sympodialis. Recent studies have shown that cell wall polysaccharides of Malassezia are detected by the immune system via the C-type lectin receptors Dectin-1 and Dectin-2, which are expressed on myeloid cells. Therefore, this study aimed to investigate a putative interaction between Dectin-1, Dectin-2 and the allergens Mala s13 and hTrx. Stimulation of human monocyte-derived dendritic cells or macrophages with Mala s13 or hTrx resulted in remarkable secretion of IL-1β and IL-23. Blocking experiments suggest that hTrx induces IL-23 by Dectin-1 binding and IL-1β by binding to either Dectin-1 or Dectin-2. Regarding Mala s13, Dectin-1 appears to be involved in IL-1β signaling. Interference of Syk kinase function was performed to investigate downstream signaling, which led to diminished hTrx responses. In our experiments, we observed rapid internalization of Mala s13 and hTrx upon cell contact and we were able to confirm direct interaction with Dectin-1 as well as Dectin-2 applying a fusion protein screening platform. We hypothesize that this cytokine response may result in a Th2/Th17-polarizing milieu, which may play a key role during the allergic sensitization in the skin, where allergen presentation to T cells is accompanied by microbial colonization and skin inflammation.
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Affiliation(s)
- L M Roesner
- Hannover Medical School, Department of Dermatology and Allergy, Division of Immunodermatology and Allergy Research, Hannover, Germany.
| | - M Ernst
- Hannover Medical School, Department of Dermatology and Allergy, Division of Immunodermatology and Allergy Research, Hannover, Germany
| | - W Chen
- Hannover Medical School, Department of Dermatology and Allergy, Division of Immunodermatology and Allergy Research, Hannover, Germany
| | - G Begemann
- Hannover Medical School, Department of Dermatology and Allergy, Division of Immunodermatology and Allergy Research, Hannover, Germany
| | - P Kienlin
- Hannover Medical School, Department of Dermatology and Allergy, Division of Immunodermatology and Allergy Research, Hannover, Germany
| | - M K Raulf
- University of Veterinary Medicine Hannover, Immunology Unit & Research Center for Emerging Infections and Zoonoses (RIZ), Hannover, Germany.,University of Veterinary Medicine Hannover, Institute for Parasitology, Hannover, Germany
| | - B Lepenies
- University of Veterinary Medicine Hannover, Immunology Unit & Research Center for Emerging Infections and Zoonoses (RIZ), Hannover, Germany
| | - T Werfel
- Hannover Medical School, Department of Dermatology and Allergy, Division of Immunodermatology and Allergy Research, Hannover, Germany
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Abstract
Asthma is a heterogeneous disease that affects approximately 300 million people worldwide, largely in developed countries. The etiology of the disease is poorly understood, but is likely to involve specific innate and adaptive responses to inhaled microbial components that are found in allergens. Fungal-derived allergens represent a major contributing factor in the initiation, persistence, exacerbation, and severity of allergic asthma. C-type lectin like receptors, such as dectin-1, dectin-2, DC-specific intercellular adhesion molecule 3-grabbing nonintegrin, and mannose receptor, recognize many fungal-derived allergens and other structurally similar allergens derived from house dust mites (HDM). In some cases, the fungal derived allergens have been structurally and functionally identified alongside their respective receptors in both humans and mice. In this review, we discuss recent understanding on how selected fungal and HDM derived allergens as well as their known or unknown receptors shape allergic airway diseases.
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Affiliation(s)
- Sabelo Hadebe
- Division of Immunology and South African Medical Research Council (SAMRC), Immunology of Infectious Diseases, Faculty of Health Sciences, Institute of Infectious Diseases and Molecular Medicine (IDM), University of Cape Town, Cape Town, South Africa
- International Centre for Genetic Engineering and Biotechnology, Cape Town Component, Cape Town, South Africa
| | - Frank Brombacher
- Division of Immunology and South African Medical Research Council (SAMRC), Immunology of Infectious Diseases, Faculty of Health Sciences, Institute of Infectious Diseases and Molecular Medicine (IDM), University of Cape Town, Cape Town, South Africa
- International Centre for Genetic Engineering and Biotechnology, Cape Town Component, Cape Town, South Africa
| | - Gordon D. Brown
- Medical Research Council Centre for Medical Mycology at the University of Aberdeen, Aberdeen Fungal Group, Institute of Medical Sciences, Aberdeen, United Kingdom
- Division of Medical Microbiology, Faculty of Health Sciences, Institute of Infectious Diseases and Molecular Medicine (IDM), University of Aberdeen AFGrica Unit, University of Cape Town, Cape Town, South Africa
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