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Vanderbeke L, Van Mol P, Van Herck Y, De Smet F, Humblet-Baron S, Martinod K, Antoranz A, Arijs I, Boeckx B, Bosisio FM, Casaer M, Dauwe D, De Wever W, Dooms C, Dreesen E, Emmaneel A, Filtjens J, Gouwy M, Gunst J, Hermans G, Jansen S, Lagrou K, Liston A, Lorent N, Meersseman P, Mercier T, Neyts J, Odent J, Panovska D, Penttila PA, Pollet E, Proost P, Qian J, Quintelier K, Raes J, Rex S, Saeys Y, Sprooten J, Tejpar S, Testelmans D, Thevissen K, Van Buyten T, Vandenhaute J, Van Gassen S, Velásquez Pereira LC, Vos R, Weynand B, Wilmer A, Yserbyt J, Garg AD, Matthys P, Wouters C, Lambrechts D, Wauters E, Wauters J. Monocyte-driven atypical cytokine storm and aberrant neutrophil activation as key mediators of COVID-19 disease severity. Nat Commun 2021; 12:4117. [PMID: 34226537 PMCID: PMC8257697 DOI: 10.1038/s41467-021-24360-w] [Citation(s) in RCA: 128] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 06/14/2021] [Indexed: 02/06/2023] Open
Abstract
Epidemiological and clinical reports indicate that SARS-CoV-2 virulence hinges upon the triggering of an aberrant host immune response, more so than on direct virus-induced cellular damage. To elucidate the immunopathology underlying COVID-19 severity, we perform cytokine and multiplex immune profiling in COVID-19 patients. We show that hypercytokinemia in COVID-19 differs from the interferon-gamma-driven cytokine storm in macrophage activation syndrome, and is more pronounced in critical versus mild-moderate COVID-19. Systems modelling of cytokine levels paired with deep-immune profiling shows that classical monocytes drive this hyper-inflammatory phenotype and that a reduction in T-lymphocytes correlates with disease severity, with CD8+ cells being disproportionately affected. Antigen presenting machinery expression is also reduced in critical disease. Furthermore, we report that neutrophils contribute to disease severity and local tissue damage by amplification of hypercytokinemia and the formation of neutrophil extracellular traps. Together our findings suggest a myeloid-driven immunopathology, in which hyperactivated neutrophils and an ineffective adaptive immune system act as mediators of COVID-19 disease severity.
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Affiliation(s)
- L Vanderbeke
- Laboratory of Clinical Bacteriology and Mycology, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - P Van Mol
- Laboratory of Translational Genetics, Department of Human Genetics, VIB-KU Leuven, Leuven, Belgium
| | - Y Van Herck
- Laboratory of Experimental Oncology, Department of Oncology, KU Leuven, Leuven, Belgium
| | - F De Smet
- Laboratory for Precision Cancer Medicine, Translational Cell and Tissue Research, Department of Imaging & Pathology, KU Leuven, Leuven, Belgium
| | - S Humblet-Baron
- Adaptive Immunology, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - K Martinod
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - A Antoranz
- Laboratory for Precision Cancer Medicine, Translational Cell and Tissue Research, Department of Imaging & Pathology, KU Leuven, Leuven, Belgium
| | - I Arijs
- Laboratory of Translational Genetics, Department of Human Genetics, VIB-KU Leuven, Leuven, Belgium
| | - B Boeckx
- Laboratory of Translational Genetics, Department of Human Genetics, VIB-KU Leuven, Leuven, Belgium
| | - F M Bosisio
- Translational Cell & Tissue Research, Department of Imaging & Pathology, KU Leuven, Leuven, Belgium
| | - M Casaer
- Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - D Dauwe
- Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - W De Wever
- Radiology, Department of Imaging & Pathology, KU Leuven, Leuven, Belgium
| | - C Dooms
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - E Dreesen
- Clinical Pharmacology and Pharmacotherapy, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - A Emmaneel
- Department of Applied Mathematics, Computer Science and Statistics, VIB-UGent Center for Inflammation Research, VIB-UGent, Gent, Belgium
| | - J Filtjens
- Laboratory of Immunobiology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - M Gouwy
- Laboratory of Molecular Immunology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - J Gunst
- Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - G Hermans
- Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - S Jansen
- Laboratory of Virology and Chemotherapy, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, B Leuven, Belgium
| | - K Lagrou
- Laboratory of Clinical Bacteriology and Mycology, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - A Liston
- Laboratory of Lymphocyte Signalling and Development, The Babraham Institute, Babraham Research Campus, Cambridge, UK
| | - N Lorent
- Department of Pneumology, University Hospitals Leuven, Leuven, Belgium
| | - P Meersseman
- Laboratory for Clinical Infectious and Inflammatory Disorders, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - T Mercier
- Laboratory of Clinical Bacteriology and Mycology, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - J Neyts
- Laboratory of Virology and Chemotherapy, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, B Leuven, Belgium
| | - J Odent
- Department of Internal Medicine, University Hospitals Leuven, Leuven, Belgium
| | - D Panovska
- Laboratory for Precision Cancer Medicine, Translational Cell and Tissue Research, Department of Imaging & Pathology, KU Leuven, Leuven, Belgium
| | - P A Penttila
- KU Leuven Flow & Mass Cytometry Facility, KU Leuven, Leuven, Belgium
| | - E Pollet
- Department of Internal Medicine, University Hospitals Leuven, Leuven, Belgium
| | - P Proost
- Laboratory of Molecular Immunology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - J Qian
- Laboratory of Translational Genetics, Department of Human Genetics, VIB-KU Leuven, Leuven, Belgium
| | - K Quintelier
- Department of Applied Mathematics, Computer Science and Statistics, VIB-UGent Center for Inflammation Research, VIB-UGent, Gent, Belgium
| | - J Raes
- Laboratory of Molecular Bacteriology (Rega Institute), Department of Microbiology, Immunology and Transplantation, KU Leuven, and VIB Center for Microbiology, Leuven, Belgium
| | - S Rex
- Anesthesiology and Algology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Y Saeys
- Department of Applied Mathematics, Computer Science and Statistics, VIB-UGent Center for Inflammation Research, VIB-UGent, Gent, Belgium
| | - J Sprooten
- Laboratory for Cell Stress & Immunity (CSI), Department of Cellular and Molecular Medicine (CMM), KU Leuven, Leuven, Belgium
| | - S Tejpar
- Molecular Digestive Oncology, Department of Oncology, KU Leuven, Leuven, Belgium
| | - D Testelmans
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - K Thevissen
- Centre of Microbial and Plant Genetics, Department of Microbial and Molecular Systems (M2S), KU Leuven, Leuven, Belgium
| | - T Van Buyten
- Laboratory of Virology and Chemotherapy, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, B Leuven, Belgium
| | - J Vandenhaute
- Laboratory of Immunobiology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - S Van Gassen
- Department of Applied Mathematics, Computer Science and Statistics, VIB-UGent Center for Inflammation Research, VIB-UGent, Gent, Belgium
| | - L C Velásquez Pereira
- Centre for Molecular and Vascular Biology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - R Vos
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - B Weynand
- Translational Cell & Tissue Research, Department of Imaging & Pathology, KU Leuven, Leuven, Belgium
| | - A Wilmer
- Laboratory for Clinical Infectious and Inflammatory Disorders, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - J Yserbyt
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium
| | - A D Garg
- Laboratory for Cell Stress & Immunity (CSI), Department of Cellular and Molecular Medicine (CMM), KU Leuven, Leuven, Belgium
| | - P Matthys
- Laboratory of Immunobiology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - C Wouters
- Adaptive Immunology, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
- Laboratory of Immunobiology, Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - D Lambrechts
- Laboratory of Translational Genetics, Department of Human Genetics, VIB-KU Leuven, Leuven, Belgium
| | - E Wauters
- Laboratory of Respiratory Diseases and Thoracic Surgery (BREATHE), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium.
| | - J Wauters
- Laboratory for Clinical Infectious and Inflammatory Disorders, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
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De Cremer K, Braem A, Gerits E, De Brucker K, Vandamme K, Martens JA, Michiels J, Vleugels J, Cammue BP, Thevissen K. Controlled release of chlorhexidine from a mesoporous silica-containing macroporous titanium dental implant prevents microbial biofilm formation. Eur Cell Mater 2017; 33:13-27. [PMID: 28076651 DOI: 10.22203/ecm.v033a02] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Roughened surfaces are increasingly being used for dental implant applications as the enlarged contact area improves bone cell anchorage, thereby facilitating osseointegration. However, the additional surface area also entails a higher risk for the development of biofilm associated infections, an etiologic factor for many dental ailments, including peri-implantitis. To overcome this problem, we designed a dental implant composed of a porous titanium-silica (Ti/SiO2) composite material and containing an internal reservoir that can be loaded with antimicrobial compounds. The composite material consists of a sol-gel derived mesoporous SiO2 diffusion barrier integrated in a macroporous Ti load-bearing structure obtained by powder metallurgical processing. The antimicrobial compounds can diffuse through the porous implant walls, thereby reducing microbial biofilm formation on the implant surface. A continuous release of µM concentrations of chlorhexidine through the Ti/SiO2 composite material was measured, without initial burst effect, over at least 10 days and using a 5 mM chlorhexidine solution in the implant reservoir. Metabolic staining, CFU counting and visualisation by scanning electron microscopy confirmed that Streptococcus mutans biofilm formation on the implant surface was almost completely prevented due to chlorhexidine release (preventive setup). Moreover, we demonstrated efficacy of released chlorhexidine against mature Streptococcus mutans biofilms (curative setup). In conclusion, we provide a proof of concept of the sustained release of chlorhexidine, one of the most widely used oral antiseptics, through the Ti/SiO2 material thereby preventing and eradicating biofilm formation on the surface of the dental implant. In principle, our flexible design allows for the use of any bioactive compound, as discussed.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - K Thevissen
- Centre of Microbial and Plant Genetics (CMPG) KU Leuven, Kasteelpark Arenberg 20 box 2460, 3001 Leuven,
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Varkas G, Thevissen K, De Brabanter G, Van Praet L, Czul-Gurdian F, Cypers H, De Kock J, Carron P, De Vos M, Hindryckx P, Arts J, Vanneuville I, Schoenaers P, Claerhout B, Abreu M, Van den Bosch F, Elewaut D. An induction or flare of arthritis and/or sacroiliitis by vedolizumab in inflammatory bowel disease: a case series. Ann Rheum Dis 2016; 76:878-881. [PMID: 27899374 DOI: 10.1136/annrheumdis-2016-210233] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [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: 07/18/2016] [Revised: 10/25/2016] [Accepted: 11/05/2016] [Indexed: 12/14/2022]
Abstract
BACKGROUND In inflammatory bowel disease (IBD), a new biological therapy has recently been approved. Vedolizumab is a humanised IgG1 monoclonal antibody to α4β7 integrin that modulates gut lymphocyte trafficking. Although an exclusively local effect of vedolizumab could be expected based on the restricted presence of the α4β7-mucosal vascular addressin cell adhesion molecule 1 complex in the gut, past combined success with anti-tumour necrosis factor, and previous demonstration of α4β7 integrin in the joint, led to the expectation of a therapeutic efficacy in spondyloarthritis. Nonetheless, the effect of vedolizumab on extraintestinal manifestations-and especially the joint-has not been reported so far. CASE REPORT A series of five patients with IBD who were treated with vedolizumab and promptly developed new onset or exacerbation of sacroiliitis or arthritis are reported. CONCLUSIONS Vedolizumab therapy does not seem to show any efficacy in and might even induce arthritis and/or sacroiliitis. However, larger cohort studies are needed to provide information on the prevalence, the evolution and underlying mechanism.
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Affiliation(s)
- G Varkas
- Department of Rheumatology, Ghent University Hospital, Ghent, Belgium.,VIB Inflammation Research Center, Ghent University, Ghent, Belgium
| | - K Thevissen
- Department of Rheumatology, Ghent University Hospital, Ghent, Belgium.,Department of Rheumatology/Physical medicine and rehabilitation, AZ Alma, Sijsele-Eeklo, Belgium
| | - G De Brabanter
- Department of Rheumatology, AZ Sint-Lucas Brugge, Bruges, Belgium
| | - L Van Praet
- Department of Rheumatology, Ghent University Hospital, Ghent, Belgium
| | - F Czul-Gurdian
- The Crohn's and Colitis Center, Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - H Cypers
- Department of Rheumatology, Ghent University Hospital, Ghent, Belgium.,VIB Inflammation Research Center, Ghent University, Ghent, Belgium
| | - J De Kock
- Department of Rheumatology, Ghent University Hospital, Ghent, Belgium
| | - P Carron
- Department of Rheumatology, Ghent University Hospital, Ghent, Belgium.,Department of Rheumatology/Physical medicine and rehabilitation, AZ Alma, Sijsele-Eeklo, Belgium
| | - M De Vos
- Department of Gastroenterology, Ghent University Hospital, Ghent, Belgium
| | - P Hindryckx
- Department of Gastroenterology, Ghent University Hospital, Ghent, Belgium
| | - J Arts
- Department of Gastroenterology, AZ Sint-Lucas Brugge, Bruges, Belgium
| | - I Vanneuville
- Department of Rheumatology/Physical medicine and rehabilitation, AZ Alma, Sijsele-Eeklo, Belgium
| | - P Schoenaers
- Department of Gastroenterology, AZ Alma, Sijsele-Eeklo, Belgium
| | - B Claerhout
- Department of Gastroenterology, AZ Alma, Sijsele-Eeklo, Belgium
| | - M Abreu
- The Crohn's and Colitis Center, Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - F Van den Bosch
- Department of Rheumatology, Ghent University Hospital, Ghent, Belgium
| | - D Elewaut
- Department of Rheumatology, Ghent University Hospital, Ghent, Belgium.,VIB Inflammation Research Center, Ghent University, Ghent, Belgium
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Longton E, Lawson G, Installé J, Bihin B, Laloux M, Borght TV, Mathieu I, Thevissen K, Daisne J. Individualized Super Selective Nodal Radiation Therapy for Clinically Negative Lymph Nodes (cN0) in Head and Neck Squamous Cell Carcinoma Patients Based on Sentinel Node(s) Identification: A Prospective Phase 2 Study of SPECT/CT-guided Volume De-escalation. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Kumar PT, Vriens K, Cornaglia M, Gijs M, Kokalj T, Thevissen K, Geeraerd A, Cammue BPA, Puers R, Lammertyn J. Digital microfluidics for time-resolved cytotoxicity studies on single non-adherent yeast cells. Lab Chip 2015; 15:1852-1860. [PMID: 25710603 DOI: 10.1039/c4lc01469c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Single cell analysis (SCA) has gained increased popularity for elucidating cellular heterogeneity at genomic, proteomic and cellular levels. Flow cytometry is considered as one of the most widely used techniques to characterize single cell responses; however, its inability to analyse cells with spatio-temporal resolution poses a major drawback. Here, we introduce a digital microfluidic (DMF) platform as a useful tool for conducting studies on isolated yeast cells in a high-throughput fashion. The reported system exhibits (i) a microwell array for trapping single non-adherent cells by shuttling a cell-containing droplet over the array, and allows (ii) implementation of high-throughput cytotoxicity assays with enhanced spatio-temporal resolution. The system was tested for five different concentrations of the antifungal drug Amphotericin B, and the cell responses were monitored over time by time lapse fluorescence microscopy. The DMF platform was validated by bulk experiments, which mimicked the DMF experimental design. A correlation analysis revealed that the results obtained on the DMF platform are not significantly different from those obtained in bulk; hence, the DMF platform can be used as a tool to perform SCA on non-adherent cells, with spatio-temporal resolution. In addition, no external forces, other than the physical forces generated by moving the droplet, were used to capture single cells, thereby avoiding cell damage. As such, the information on cellular behaviour during treatment could be obtained for every single cell over time making this platform noteworthy in the field of SCA.
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Affiliation(s)
- P T Kumar
- BIOSYST-MEBIOS, KU Leuven, Willem de Croylaan 42, Heverlee, Belgium.
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Delattin N, De Brucker K, Vandamme K, Meert E, Marchand A, Chaltin P, Cammue BPA, Thevissen K. Repurposing as a means to increase the activity of amphotericin B and caspofungin against Candida albicans biofilms. J Antimicrob Chemother 2013; 69:1035-44. [DOI: 10.1093/jac/dkt449] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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Wijnands J, Viechtbauer W, Thevissen K, van der Linden S, Dagnelie P, Stehouwer C, Arts I, Boonen A. SAT0375 The Prevalence of Gout is Highly Influenced by the Applied Classification Criteria: Results of a Systematic Review and Meta-Regression Analysis of the Literature. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.2100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Machado P, Castrejon I, Katchamart W, Koevoets R, Kuriya B, Schoels M, Silva-Fernández L, Thevissen K, Vercoutere W, Villeneuve E, Aletaha D, Carmona L, Landewé R, van der Heijde D, Bijlsma JWJ, Bykerk V, Canhão H, Catrina AI, Durez P, Edwards CJ, Mjaavatten MD, Leeb BF, Losada B, Martín-Mola EM, Martinez-Osuna P, Montecucco C, Müller-Ladner U, Østergaard M, Sheane B, Xavier RM, Zochling J, Bombardier C. Multinational evidence-based recommendations on how to investigate and follow-up undifferentiated peripheral inflammatory arthritis: integrating systematic literature research and expert opinion of a broad international panel of rheumatologists in the 3E Initiative. Ann Rheum Dis 2010; 70:15-24. [PMID: 20724311 PMCID: PMC3002765 DOI: 10.1136/ard.2010.130625] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Objective To develop evidence-based recommendations on how to investigate and follow-up undifferentiated peripheral inflammatory arthritis (UPIA). Methods 697 rheumatologists from 17 countries participated in the 3E (Evidence, Expertise, Exchange) Initiative of 2008–9 consisting of three separate rounds of discussions and modified Delphi votes. In the first round 10 clinical questions were selected. A bibliographic team systematically searched Medline, Embase, the Cochrane Library and ACR/EULAR 2007–2008 meeting abstracts. Relevant articles were reviewed for quality assessment, data extraction and synthesis. In the second round each country elaborated a set of national recommendations. Finally, multinational recommendations were formulated and agreement among the participants and the potential impact on their clinical practice was assessed. Results A total of 39 756 references were identified, of which 250 were systematically reviewed. Ten multinational key recommendations about the investigation and follow-up of UPIA were formulated. One recommendation addressed differential diagnosis and investigations prior to establishing the operational diagnosis of UPIA, seven recommendations related to the diagnostic and prognostic value of clinical and laboratory assessments in established UPIA (history and physical examination, acute phase reactants, autoantibodies, radiographs, MRI and ultrasound, genetic markers and synovial biopsy), one recommendation highlighted predictors of persistence (chronicity) and the final recommendation addressed monitoring of clinical disease activity in UPIA. Conclusions Ten recommendations on how to investigate and follow-up UPIA in the clinical setting were developed. They are evidence-based and supported by a large panel of rheumatologists, thus enhancing their validity and practical use.
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Affiliation(s)
- P Machado
- Department of Rheumatology, Coimbra University Hospital, Coimbra, Portugal.
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9
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Minnebruggen GV, Francois IJ, Cammue BP, Thevissen K, Vroome V, Borgers M, Shroot B. A General Overview on Past, Present and Future Antimycotics~!2009-11-01~!2010-04-06~!2010-06-24~! ACTA ACUST UNITED AC 2010. [DOI: 10.2174/1874437001004010022] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Stubbe M, Smith V, Thevissen K, Mielants H, De Keyser F. A red face in a lupus patient: thinking beyond lupus rash. Acta Clin Belg 2010; 65:44-7. [PMID: 20373598 DOI: 10.1179/acb.2010.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
A 61-year-old woman with a history of systemic lupus erythematosus presented with a facial rash followed by fever. The diagnosis of lupus flare was made by the general practioner who prescribed corticosteroids. The evolution was unfavorable and the patient was hospitalized. On admission, she presented with high fever and a sharply demarcated papular erythema overlying her cheeks. Biology was inflammatory with elevated C-reactive protein, sedimentation rate and leucocyte count. The diagnosis of erysipelas of the face was made on the basis of the malar and non pruritic papular erythema, fever, the high C-reactive protein levels and the absence of response to corticosteroids. The evolution was favorable under intravenous antibiotics and rapid tapering of the corticosteroids. To our knowledge, this is the first report of facial erysipelas in a patient with a history of systemic lupus erythematosus. This coincidence is a rare condition which may lead to erroneous diagnosis and inappropriate therapy.
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Affiliation(s)
- M Stubbe
- Reumatologie, Universitair Ziekenhuis Gent, Gent, België
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11
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Abstract
Defensins are small (~5 kDa), basic, cysteine-rich antimicrobial peptides that fulfill an important role in the innate immunity of their host by combating pathogenic invading micro-organisms. Defensins can inhibit the growth or virulence of microorganisms directly or can do so indirectly by enhancing the host's immune system. Because of their wide distribution in nature, defensins are believed to be ancient molecules with a common ancestor that arose more than a billion years ago. This review summarizes current knowledge concerning the mode of antifungal action of plant, insect and human defensins.
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Affiliation(s)
- A M Aerts
- Centre of Microbial and Plant Genetics (CMPG), Katholieke Universiteit Leuven, Heverlee, Belgium
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12
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Cammue BP, De Bolle MF, Schoofs HM, Terras FR, Thevissen K, Osborn RW, Rees SB, Broekaert WF. Gene-encoded antimicrobial peptides from plants. Ciba Found Symp 2007; 186:91-101; discussion 101-6. [PMID: 7768160 DOI: 10.1002/9780470514658.ch6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
On the basis of an extensive screening of seeds from various plant species, we have isolated and characterized several different antimicrobial peptides. They were all typified by having a broad antifungal activity spectrum, a relatively low molecular weight (3-14 kDa), a high cysteine content and a high isoelectric point (pI > 10). With respect to their amino acid sequence, these peptides can be classified into six structural classes. Synergistic enhancement (up to 73-fold) of antimicrobial activity was demonstrated in some combinations of peptides belonging to different classes. cDNA clones corresponding to different antifungal peptides were isolated and used to transform tobacco plants. Extracts of these transgenic plants showed higher (up to 16-fold) antifungal activity than untransformed control plants. Such antimicrobial peptides may find applications in molecular breeding of plants with increased disease resistance.
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Affiliation(s)
- B P Cammue
- F. A. Janssens Laboratory of Genetics, Catholic University of Leuven, Belgium
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13
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Abstract
Sphingolipids are essential membrane components, present in all eukaryotic cells, but structurally distinct in mammalian and fungal cells. Therefore, they represent an attractive new target for the development of novel antimycotics. This review will briefly highlight sphingolipid biosynthesis and functions in the yeast Saccharomyces cerevisiae. In addition, naturally occurring antifungal compounds that interact with fungal-specific sphingolipids, resulting in fungal growth arrest, will be discussed regarding their mode of action, and therapeutic value. These compounds include plant and insect defensins, syringomycin E and antifungal antibodies to sphingolipids.
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Affiliation(s)
- K Thevissen
- Centre of Microbial and Plant Genetics, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, B-3001 Heverlee, Belgium.
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Aerts A, Thevissen K, Bresseleers S, Wouters P, Cammue B, François I. Heterologous production of human beta-defensin-2 in Arabidopsis thaliana. Commun Agric Appl Biol Sci 2005; 70:51-5. [PMID: 16366273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Affiliation(s)
- A Aerts
- Centre of Microbial and Plant Genetics, Heverlee, Belgium
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15
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Schaaper WM, Posthuma GA, Plasman HH, Sijtsma L, Fant F, Borremans FA, Thevissen K, Broekaert WF, Meloen RH, van Amerongen A. Synthetic peptides derived from the β2−β3 loop ofRaphanus sativusantifungal protein 2 that mimic the active site. ACTA ACUST UNITED AC 2002; 57:409-18. [PMID: 11350601 DOI: 10.1034/j.1399-3011.2001.00842.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Rs-AFPs are antifungal proteins, isolated from radish (Raphanus sativus) seed or leaves, which consist of 50 or 51 amino acids and belong to the plant defensin family of proteins. Four highly homologous Rs-AFPs have been isolated (Rs-AFP1-4). The structure of Rs-AFP1 consists of three beta-strands and an alpha-helix, and is stabilized by four cystine bridges. Small peptides deduced from the native sequence, still having biological activity, are not only important tools to study structure-function relationships, but may also constitute a commercially interesting target. In an earlier study, we showed that the antifungal activity of Rs-AFP2 is concentrated mainly in the beta2-beta3 loop. In this study, we synthesized linear 19-mer peptides, spanning the entire beta2-beta3 loop, that were found to be almost as potent as Rs-AFP2. Cysteines, highly conserved in the native protein, are essential for maintaining the secondary structure of the protein. Surprisingly, in the 19-mer loop peptides, cysteines can be replaced by alpha-aminobutyric acid, which even improves the antifungal potency of the peptides. Analogous cyclic 19-mer peptides, forced to adopt a hairpin structure by the introduction of one or two non-native disulfide bridges, were also found to possess high antifungal activity. The synthetic 19-mer peptides, like Rs-AFP2 itself, cause increased Ca2+ influx in pregerminated fungal hyphae.
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Affiliation(s)
- W M Schaaper
- Institute for Animal Science and Health (ID-Lelystad), Lelystad, The Netherlands.
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Serna A, Maitz M, O'Connell T, Santandrea G, Thevissen K, Tienens K, Hueros G, Faleri C, Cai G, Lottspeich F, Thompson RD. Maize endosperm secretes a novel antifungal protein into adjacent maternal tissue. Plant J 2001; 25:687-98. [PMID: 11319035 DOI: 10.1046/j.1365-313x.2001.01004.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A series of endosperm transfer layer-specific transcripts has been identified in maize by differential screening of a cDNA library of transcripts at 10 days after pollination. Sequence comparisons revealed among this class of cDNAs a novel, small gene family of highly diverged sequences encoding basal layer antifungal proteins (BAPs). The bap genes mapped to two loci on chromosomes 4 and 10. So far, bap-homologous sequences have been detected only in maize, teosinte and sorghum, and are not present in grasses outside the Andropogoneae tribe. BAP2 is synthesized as a pre-proprotein, and is processed by successive removal of a signal peptide and a 29-residue prodomain. The proprotein can be detected exclusively in microsomal membrane-containing fractions of kernel extracts. Immunolocalization reveals BAP2 to be predominantly located in the placentochalazal cells of the pedicel, adjacent to the basal endosperm transfer layer (BETL) cells, although the BAP2 transcript is found only in the BETL cells. The biological roles of BAP2 propeptide and mature peptide have been investigated by heterologous expression of the proprotein in Escherichia coli, and by tests of its fungistatic activity and that of the fully processed form in vitro. The mature BAP2 peptide exhibits potent broad-range activity against a range of filamentous fungi, including several plant pathogens.
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Affiliation(s)
- A Serna
- MPI für Züchtungsforschung, Carl-von-Linné Weg 10, D-50829 Köln, Germany
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Thevissen K, Cammue BP, Lemaire K, Winderickx J, Dickson RC, Lester RL, Ferket KK, Van Even F, Parret AH, Broekaert WF. A gene encoding a sphingolipid biosynthesis enzyme determines the sensitivity of Saccharomyces cerevisiae to an antifungal plant defensin from dahlia (Dahlia merckii). Proc Natl Acad Sci U S A 2000; 97:9531-6. [PMID: 10931938 PMCID: PMC16899 DOI: 10.1073/pnas.160077797] [Citation(s) in RCA: 138] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We have previously identified a Saccharomyces cerevisiae mutant that is markedly more resistant than wild-type to Dahlia merckii antimicrobial peptide 1 (DmAMP1), an antifungal plant defensin isolated from seeds of dahlia (Dahlia merckii). A complementation approach was followed that consisted of the introduction of a genomic library of DmAMP1-sensitive wild-type yeast into the DmAMP1-resistant yeast mutant and screening for restored sensitivity to DmAMP1. The gene determining sensitivity of S. cerevisiae to DmAMP1 was identified as IPT1, a gene encoding an enzyme involved in the last step of the synthesis of the sphingolipid mannose-(inositol-phosphate)(2)-ceramide. Strains with a nonfunctional IPT1 allele lacked mannose-(inositol-phosphate)(2)-ceramide in their plasma membranes, bound significantly less DmAMP1 compared with wild-type strains, and were highly resistant to DmAMP1-mediated membrane permeabilization. All of these phenotypic deviations could be restored by reintroduction of a functional IPT1 gene. Our data support a model in which membrane patches containing sphingolipids act as binding sites for DmAMP1 or, alternatively, are required to anchor membrane or cell wall-associated proteins, which themselves interact with DmAMP1.
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Affiliation(s)
- K Thevissen
- F. A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, Belgium
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Thevissen K, Osborn RW, Acland DP, Broekaert WF. Specific binding sites for an antifungal plant defensin from Dahlia (Dahlia merckii) on fungal cells are required for antifungal activity. Mol Plant Microbe Interact 2000; 13:54-61. [PMID: 10656585 DOI: 10.1094/mpmi.2000.13.1.54] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Dm-AMP1, an antifungal plant defensin from seeds of dahlia (Dahlia merckii), was radioactively labeled with t-butoxycarbonyl-[35S]-L-methionine N-hydroxy-succinimi-dylester. This procedure yielded a 35S-labeled peptide with unaltered antifungal activity. [35S]Dm-AMP1 was used to assess binding on living cells of the filamentous fungus Neurospora crassa and the unicellular fungus Saccharomyces cerevisiae. Binding of [35S]Dm-AMP1 to fungal cells was saturable and could be competed for by preincubation with excess, unlabeled Dm-AMP1 as well as with Ah-AMP1 and Ct-AMP1, two plant defensins that are highly homologous to Dm-AMP1. In contrast, binding could not be competed for by more distantly related plant defensins or structurally unrelated antimicrobial peptides. Binding of [35S]Dm-AMP1 to either N. crassa or S. cerevisiae cells was apparently irreversible. In addition, whole cells and microsomal membrane fractions from two independently obtained S. cerevisiae mutants selected for resistance to Dm-AMP1 exhibited severely reduced binding affinity for [35S]Dm-AMP1, compared with wild-type yeast. This finding suggests that binding of Dm-AMP1 to S. cerevisiae plasma membranes is required for antifungal activity of this protein.
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Affiliation(s)
- K Thevissen
- F.A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, Heverlee-Leuven, Belgium
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Thevissen K, Terras FR, Broekaert WF. Permeabilization of fungal membranes by plant defensins inhibits fungal growth. Appl Environ Microbiol 1999; 65:5451-8. [PMID: 10584003 PMCID: PMC91743 DOI: 10.1128/aem.65.12.5451-5458.1999] [Citation(s) in RCA: 270] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/1999] [Accepted: 09/15/1999] [Indexed: 11/20/2022] Open
Abstract
We used an assay based on the uptake of SYTOX Green, an organic compound that fluoresces upon interaction with nucleic acids and penetrates cells with compromised plasma membranes, to investigate membrane permeabilization in fungi. Membrane permeabilization induced by plant defensins in Neurospora crassa was biphasic, depending on the plant defensin dose. At high defensin levels (10 to 40 microM), strong permeabilization was detected that could be strongly suppressed by cations in the medium. This permeabilization appears to rely on direct peptide-phospholipid interactions. At lower defensin levels (0.1 to 1 microM), a weaker, but more cation-resistant, permeabilization occurred at concentrations that correlated with the inhibition of fungal growth. Rs-AFP2(Y38G), an inactive variant of the plant defensin Rs-AFP2 from Raphanus sativus, failed to induce cation-resistant permeabilization in N. crassa. Dm-AMP1, a plant defensin from Dahlia merckii, induced cation-resistant membrane permeabilization in yeast (Saccharomyces cerevisiae) which correlated with its antifungal activity. However, Dm-AMP1 could not induce cation-resistant permeabilization in the Dm-AMP1-resistant S. cerevisiae mutant DM1, which has a drastically reduced capacity for binding Dm-AMP1. We think that cation-resistant permeabilization is binding site mediated and linked to the primary cause of fungal growth inhibition induced by plant defensins.
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Affiliation(s)
- K Thevissen
- F. A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, B-3001 Heverlee-Leuven, Belgium
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Thevissen K, Osborn RW, Acland DP, Broekaert WF. Specific, high affinity binding sites for an antifungal plant defensin on Neurospora crassa hyphae and microsomal membranes. J Biol Chem 1997; 272:32176-81. [PMID: 9405418 DOI: 10.1074/jbc.272.51.32176] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Hs-AFP1, an antifungal plant defensin from seed of the plant Heuchera sanguinea, was radioactively labeled using t-butoxycarbonyl-[35S]L-methionine N-hydroxysuccinimidyl ester, resulting in a 35S-labeled peptide with unaltered antifungal activity. [35S]Hs-AFP1 was used to assess binding on living hyphae of the fungus Neurospora crassa. Binding of [35S]Hs-AFP1 was found to be competitive, reversible, and saturable with an apparent Kd of 29 nM and a Bmax of 1.4 pmol/mg protein. [35S]Hs-AFP1 also bound specifically and reversibly to microsomal membranes derived from N. crassa hyphae with a Kd of 27 nM and a Bmax of 102 pmol/mg protein. The similarity in Kd value between binding sites on hyphae and microsomes indicates that Hs-AFP1 binding sites reside on the plasma membrane. Binding of [35S]Hs-AFP1 to both hyphae and microsomal membranes could be competed to some extent by four different structurally related plant defensins but not by various structurally unrelated antimicrobial peptides. In addition, an inactive single amino acid substitution variant of the antifungal plant defensin Rs-AFP2 from Raphanus sativus seed was also unable to displace [35S]Hs-AFP1 from its binding sites, whereas Rs-AFP2 itself was able to compete with [35S]Hs-AFP1.
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Affiliation(s)
- K Thevissen
- F. A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, K. Mercierlaan 92, B-3001 Heverlee, Belgium
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21
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De Samblanx GW, Goderis IJ, Thevissen K, Raemaekers R, Fant F, Borremans F, Acland DP, Osborn RW, Patel S, Broekaert WF. Mutational analysis of a plant defensin from radish (Raphanus sativus L.) reveals two adjacent sites important for antifungal activity. J Biol Chem 1997; 272:1171-9. [PMID: 8995418 DOI: 10.1074/jbc.272.2.1171] [Citation(s) in RCA: 141] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Mutational analysis of Rs-AFP2, a radish antifungal peptide belonging to a family of peptides referred to as plant defensins, was performed using polymerase chain reaction-based site-directed mutagenesis and yeast as a system for heterologous expression. The strategy followed to select candidate amino acid residues for substitution was based on sequence comparison of Rs-AFP2 with other plant defensins exhibiting differential antifungal properties. Several mutations giving rise to peptide variants with reduced antifungal activity against Fusarium culmorum were identified. In parallel, an attempt was made to construct variants with enhanced antifungal activity by substituting single amino acids by arginine. Two arginine substitution variants were found to be more active than wild-type Rs-AFP2 in media with high ionic strength. Our data suggest that Rs-AFP2 possesses two adjacent sites that appear to be important for antifungal activity, namely the region around the type VI beta-turn connecting beta-strands 2 and 3, on the one hand, and the region formed by residues on the loop connecting beta-strand 1 and the alpha-helix and contiguous residues on the alpha-helix and beta-strand 3, on the other hand. When added to F. culmorum in a high ionic strength medium, Rs-AFP2 stimulated Ca2+ uptake by up to 20-fold. An arginine substitution variant with enhanced antifungal activity caused increased Ca2+ uptake by up to 50-fold, whereas a variant that was virtually devoid of antifungal activity did not stimulate Ca2+ uptake.
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Affiliation(s)
- G W De Samblanx
- F. A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, Heverlee, Belgium
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Thevissen K, Ghazi A, De Samblanx GW, Brownlee C, Osborn RW, Broekaert WF. Fungal membrane responses induced by plant defensins and thionins. J Biol Chem 1996; 271:15018-25. [PMID: 8663029 DOI: 10.1074/jbc.271.25.15018] [Citation(s) in RCA: 190] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Treatment of hyphae of Neurospora crassa with antifungal plant defensins, i.e. Rs-AFP2 and Dm-AMP1 isolated from radish and dahlia seed, respectively, induced a rapid K+ efflux, Ca2+ uptake, and alkalinization of the incubation medium. The Rs-AFP2-induced alkalinization of the incubation medium could be inhibited with G-protein inhibitors. alpha-Hordothionin, an antifungal thionin from barley seed, caused a sustained increased Ca2+ uptake at subinhibitory concentrations but only a transient increased uptake at inhibitory concentrations. alpha-Hordothionin also caused increased K+ efflux and alkalinization of the medium, but these fluxes occurred more rapidly compared to those caused by plant defensins. Furthermore, alpha-hordothionin caused permeabilization of fungal hyphae to the non-metabolite alpha-aminoisobutyric acid and, in addition, altered the electrical properties of artificial lipid bilayers, consistently leading to rupture of the lipid bilayers. The plant defensins did not form ion-permeable pores in artificial membranes and did not exhibit substantial hyphal membrane permeabilization activity. Our results are consistent with the notion that thionins inhibit fungal growth as a result of direct protein-membrane interactions, whereas plant defensins might act via a different, possibly receptor-mediated, mechanism.
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Affiliation(s)
- K Thevissen
- F. A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, Willem de Croylaan 42, B-3001 Heverlee, Belgium
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Cammue BP, Thevissen K, Hendriks M, Eggermont K, Goderis IJ, Proost P, Van Damme J, Osborn RW, Guerbette F, Kader JC. A potent antimicrobial protein from onion seeds showing sequence homology to plant lipid transfer proteins. Plant Physiol 1995; 109:445-55. [PMID: 7480341 PMCID: PMC157606 DOI: 10.1104/pp.109.2.445] [Citation(s) in RCA: 180] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
An antimicrobial protein of about 10 kD, called Ace-AMP1, was isolated from onion (Allium cepa L.) seeds. Based on the near-complete amino acid sequence of this protein, oligonucleotides were designed for polymerase chain reaction-based cloning of the corresponding cDNA. The mature protein is homologous to plant nonspecific lipid transfer proteins (nsLTPs), but it shares only 76% of the residues that are conserved among all known plant nsLTPs and is unusually rich in arginine. Ace-AMP1 inhibits all 12 tested plant pathogenic fungi at concentrations below 10 micrograms mL-1. Its antifungal activity is either not at all or is weakly affected by the presence of different cations at concentrations approximating physiological ionic strength conditions. Ace-AMP1 is also active on two Gram-positive bacteria but is apparently not toxic for Gram-negative bacteria and cultured human cells. In contrast to nsLTPs such as those isolated from radish or maize seeds, Ace-AMP1 was unable to transfer phospholipids from liposomes to mitochondria. On the other hand, lipid transfer proteins from wheat and maize seeds showed little or no antimicrobial activity, whereas the radish lipid transfer protein displayed antifungal activity only in media with low cation concentrations. The relevance of these findings with regard to the function of nsLTPs is discussed.
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Affiliation(s)
- B P Cammue
- F.A. Janssens Laboratory of Genetics, Katholieke Universiteit Leuven, Heverlee, Belgium
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Osborn RW, De Samblanx GW, Thevissen K, Goderis I, Torrekens S, Van Leuven F, Attenborough S, Rees SB, Broekaert WF. Isolation and characterisation of plant defensins from seeds of Asteraceae, Fabaceae, Hippocastanaceae and Saxifragaceae. FEBS Lett 1995; 368:257-62. [PMID: 7628617 DOI: 10.1016/0014-5793(95)00666-w] [Citation(s) in RCA: 314] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
From seeds of Aesculus hippocastanum, Clitoria ternatea, Dahlia merckii and Heuchera sanguinea five antifungal proteins were isolated and shown to be homologous to plant defensins previously characterised from radish seeds and gamma-thionins from Poaceae seeds. Based on the spectrum of their antimicrobial activity and the morphological distortions they induce on fungi the peptides can be divided into two classes. The peptides did not inhibit any of three different alpha-amylases.
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Affiliation(s)
- R W Osborn
- Zeneca Agrochemicals, Bracknell, Berks, UK
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Terras FRG, Schoofs HME, Thevissen K, Osborn RW, Vanderleyden J, Cammue BPA, Broekaert WF. Synergistic Enhancement of the Antifungal Activity of Wheat and Barley Thionins by Radish and Oilseed Rape 2S Albumins and by Barley Trypsin Inhibitors. Plant Physiol 1993; 103:1311-1319. [PMID: 12232024 PMCID: PMC159121 DOI: 10.1104/pp.103.4.1311] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Although thionins and 2S albumins are generally considered as storage proteins, both classes of seed proteins are known to inhibit the growth of pathogenic fungi. We have now found that the wheat (Triticum aestivum L.) or barley (Hordeum vulgare L.) thionin concentration required for 50% inhibition of fungal growth is lowered 2- to 73-fold when combined with 2S albumins (at sub- or noninhibitory concentrations) from radish (Raphanus sativus L.) or oilseed rape (Brassica napus L.). Furthermore, the thionin antifungal activity is synergistically enhanced (2- to 33-fold) by either the small subunit or the large subunit of the radish 2S albumins. Three other 2S albumin-like proteins, the barley trypsin inhibitor and two barley Bowman-Birk-type trypsin inhibitor isoforms, also act synergistically with the thionins (2- to 55-fold). The synergistic activity of thionins combined with 2S albumins is restricted to filamentous fungi and to some Gram-positive bacteria, whereas Gram-negative bacteria, yeast, cultured human cells, and erythrocytes do not show an increased sensitivity to thionin/albumin combinations (relative to the sensitivity to the thionins alone). Scanning electron microscopy and measurement of K+ leakage from fungal hyphae revealed that 2S albumins have the same mode of action as thionins, namely the permeabilization of the hyphal plasmalemma. Moreover, 2S albumins and thionins act synergistically in their ability to permeabilize fungal membranes.
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Affiliation(s)
- FRG. Terras
- F.A. Janssens Laboratory of Genetics, Catholic University of Leuven, W. De Croylaan 42, B-3001 Heverlee, Belgium (F.R.G.T., H.M.E.S., K.T., J.V., B.P.A.C., W.F.B.)
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