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Vermeulen S, De Bleecker C, Spanhove V, Segers V, Willems T, Roosen P, Vanrenterghem J, De Ridder R. The effect of fatigue on spike jump biomechanics in view of patellar tendon loading in volleyball. Scand J Med Sci Sports 2023; 33:2208-2218. [PMID: 37522308 DOI: 10.1111/sms.14458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 01/17/2023] [Revised: 07/04/2023] [Accepted: 07/18/2023] [Indexed: 08/01/2023]
Abstract
BACKGROUND AND OBJECTIVE Patellar tendinopathy (PT) is a highly prevalent overuse injury in volleyball and is often linked with overloading of the patellar tendon. Little is known, however, about whether and how patellar tendon loading is affected by fatigue during the most challenging jump activity in volleyball. Therefore, this study investigates the effect of a high-intensity, intermittent fatigue protocol on movement alterations in terms of patellar tendon loading during a volleyball spike jump. METHODS Forty-three male volleyball players participated in this study. Three-dimensional full-body kinematics and kinetics were collected when performing a spike jump before and after the fatigue protocol. Sagittal plane joint angles, joint work and patellar tendon loading were calculated and analyzed with curve analyses using paired sample t-tests to investigate fatigue effects (p < 0.05). RESULTS Fatigue induced a stiffer lower extremity landing strategy together with prolonged pelvis-trunk flexion compared to baseline (p = 0.001-0.005). Decreased patellar tendon forces (p = 0.001-0.010) and less eccentric knee joint work (-5%, p < 0.001) were observed after the fatigue protocol compared to baseline. CONCLUSION Protective strategies seem to be utilized in a fatigued state to avoid additional tensile forces acting on the patellar tendon, including proximal compensations and stiff lower extremity landings. We hypothesize that players might be more prone for developing PT if eccentric patellar tendon loads are high in the non-fatigued state and/or these loads are somehow not decreased after fatigue.
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Affiliation(s)
- Stefan Vermeulen
- Department of Rehabilitation Sciences, Ghent University, Ghent, Belgium
- Department of Rehabilitation Sciences, KU Leuven, Leuven, Belgium
| | - Camilla De Bleecker
- Department of Rehabilitation Sciences, Ghent University, Ghent, Belgium
- Department of Rehabilitation Sciences, KU Leuven, Leuven, Belgium
| | | | - Veerle Segers
- Department of Movement and Sports Sciences, Ghent University, Ghent, Belgium
| | - Tine Willems
- Department of Rehabilitation Sciences, Ghent University, Ghent, Belgium
| | - Philip Roosen
- Department of Rehabilitation Sciences, Ghent University, Ghent, Belgium
| | | | - Roel De Ridder
- Department of Rehabilitation Sciences, Ghent University, Ghent, Belgium
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2
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Galván-Chacón V, de Melo Pereira D, Vermeulen S, Yuan H, Li J, Habibović P. Decoupling the role of chemistry and microstructure in hMSCs response to an osteoinductive calcium phosphate ceramic. Bioact Mater 2023; 19:127-138. [PMID: 35475029 PMCID: PMC9014318 DOI: 10.1016/j.bioactmat.2022.03.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 03/17/2022] [Accepted: 03/18/2022] [Indexed: 11/30/2022] Open
Affiliation(s)
- V.P. Galván-Chacón
- MERLN Institute for Technology Inspired Regenerative Medicine, Maastricht University, the Netherlands
| | - D. de Melo Pereira
- MERLN Institute for Technology Inspired Regenerative Medicine, Maastricht University, the Netherlands
| | - S. Vermeulen
- MERLN Institute for Technology Inspired Regenerative Medicine, Maastricht University, the Netherlands
| | - H. Yuan
- Kuros Biosciences BV, 3723 MB, Bilthoven, the Netherlands
| | - J. Li
- MERLN Institute for Technology Inspired Regenerative Medicine, Maastricht University, the Netherlands
| | - P. Habibović
- MERLN Institute for Technology Inspired Regenerative Medicine, Maastricht University, the Netherlands
- Corresponding author. Maastricht University, MERLN Institute, Universiteitsingel 40, 6229ER, Maastricht, the Netherlands.
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Araújo J, Lebert B, Vermeulen S, Brachmann A, Ohm R, Evans H, de Bekker C. Masters of the manipulator: two new hypocrealean genera, Niveomyces ( Cordycipitaceae) and Torrubiellomyces ( Ophiocordycipitaceae), parasitic on the zombie ant fungus Ophiocordyceps camponoti-floridani. Persoonia 2022; 49:171-194. [PMID: 38234384 PMCID: PMC10792228 DOI: 10.3767/persoonia.2022.49.05] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 06/13/2022] [Indexed: 11/11/2022]
Abstract
During surveys in central Florida of the zombie-ant fungus Ophiocordyceps camponoti-floridani, which manipulates the behavior of the carpenter ant Camponotus floridanus, two distinct fungal morphotypes were discovered associated with and purportedly parasitic on O. camponoti-floridani. Based on a combination of unique morphology, ecology and phylogenetic placement, we discovered that these morphotypes comprise two novel lineages of fungi. Here, we propose two new genera, Niveomyces and Torrubiellomyces, each including a single species within the families Cordycipitaceae and Ophiocordycipitaceae, respectively. We generated de novo draft genomes for both new species and performed morphological and multi-loci phylogenetic analyses. The macromorphology and incidence of both new species, Niveomyces coronatus and Torrubiellomyces zombiae, suggest that these fungi are mycoparasites since their growth is observed exclusively on O. camponoti-floridani mycelium, stalks and ascomata, causing evident degradation of their fungal hosts. This work provides a starting point for more studies into fungal interactions between mycopathogens and entomopathogens, which have the potential to contribute towards efforts to battle the global rise of plant and animal mycoses. Citation: Araújo JPM, Lebert BM, Vermeulen S, et al. 2022. Masters of the manipulator: two new hypocrealean general, Niveomyces (Cordycipitaceae) and Torrubiellomyces (Ophiocordycipitaceae), parasitic on the zombie ant fungus Ophiocordyceps camponoti-floridani. Persoonia 49: 171-194. https://doi.org/10.3767/persoonia.2022.49.05.
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Affiliation(s)
- J.P.M. Araújo
- Institute of Systematic Botany, The New York Botanical Garden, 10458 Bronx - New York, USA
| | - B.M. Lebert
- Department of Biology, College of Sciences, University of Central Florida, 32816 Orlando, Florida, USA
| | - S. Vermeulen
- Department of Biology, College of Sciences, University of Central Florida, 32816 Orlando, Florida, USA
| | - A. Brachmann
- Genetics, Faculty of Biology, Ludwig-Maximilians University Munich, 82152 Martinsried, Germany
| | - R.A. Ohm
- Microbiology, Department of Biology, Utrecht University,3584 CH Utrecht, The Netherlands
| | - H.C. Evans
- CAB International, E-UK, Egham, Surrey TW20 9TY, UK
| | - C. de Bekker
- Department of Biology, College of Sciences, University of Central Florida, 32816 Orlando, Florida, USA
- Microbiology, Department of Biology, Utrecht University,3584 CH Utrecht, The Netherlands
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Diekstra M, Swen J, van der Zanden L, Vermeulen S, Boven E, Mathijssen R, Oskarsdottir A, Oosterwijk E, Cambon-Thomsen A, Castellano D, Fritsch A, Garcia-Donas J, Rodriguez-Antona C, Jaehde U, Rafnar T, Stefansson K, Bohringer S, Kubo M, Kiemeney L, Guchelaar HJ. 685P Genome-wide association meta-analysis identifies novel variants that correlate with efficacy outcomes in sunitinib-treated patients with metastatic renal cell carcinoma. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.081] [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: 10/20/2022] Open
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Lebeaux D, Merabishvili M, Caudron E, Lannoy D, Van Simaey L, Duyvejonck H, Guillemain R, Thumerelle C, Podglajen I, Compain F, Kassis N, Mainardi JL, Wittmann J, Rohde C, Pirnay JP, Dufour N, Vermeulen S, Gansemans Y, Van Nieuwerburgh F, Vaneechoutte M. A Case of Phage Therapy against Pandrug-Resistant Achromobacter xylosoxidans in a 12-Year-Old Lung-Transplanted Cystic Fibrosis Patient. Viruses 2021; 13:v13010060. [PMID: 33466377 PMCID: PMC7824836 DOI: 10.3390/v13010060] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [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: 11/29/2020] [Revised: 12/29/2020] [Accepted: 12/30/2020] [Indexed: 12/17/2022] Open
Abstract
Bacteriophages are a promising therapeutic strategy among cystic fibrosis and lung-transplanted patients, considering the high frequency of colonization/infection caused by pandrug-resistant bacteria. However, little clinical data are available regarding the use of phages for infections with Achromobacter xylosoxidans. A 12-year-old lung-transplanted cystic fibrosis patient received two rounds of phage therapy because of persistent lung infection with pandrug-resistant A. xylosoxidans. Clinical tolerance was perfect, but initial bronchoalveolar lavage (BAL) still grew A. xylosoxidans. The patient's respiratory condition slowly improved and oxygen therapy was stopped. Low-grade airway colonization by A. xylosoxidans persisted for months before samples turned negative. No re-colonisation occurred more than two years after phage therapy was performed and imipenem treatment was stopped. Whole genome sequencing indicated that the eight A. xylosoxidans isolates, collected during phage therapy, belonged to four delineated strains, whereby one had a stop mutation in a gene for a phage receptor. The dynamics of lung colonisation were documented by means of strain-specific qPCRs on different BALs. We report the first case of phage therapy for A. xylosoxidans lung infection in a lung-transplanted patient. The dynamics of airway colonization was more complex than deduced from bacterial culture, involving phage susceptible as well as phage resistant strains.
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Affiliation(s)
- David Lebeaux
- Université de Paris, F-75006 Paris, France; (I.P.); (F.C.); (J.-L.M.)
- Service de Microbiologie, Unité Mobile d’Infectiologie, AP-HP, Hôpital Européen Georges Pompidou, 20 rue Leblanc, 75015 Paris, France
- Correspondence: ; Tel.: +33-1-56-09-29-69; Fax: +33-1-56-09-24-46
| | - Maia Merabishvili
- Laboratory Molecular and Cellular Technology, Queen Astrid Military Hospital, Bruynstraat 1, B-1120 Brussels, Belgium; (M.M.); (J.-P.P.)
- Laboratory Bacteriology Research, Faculty of Medicine & Health Sciences, Ghent University, C. Heymanslaan 10, B-9000 Gent, Belgium; (L.V.S.); (H.D.); (M.V.)
| | - Eric Caudron
- Service de Pharmacie, Hôpital européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris Centre Université-Paris, 20 rue Leblanc, 75015 Paris, France;
- Lipides, Systèmes Analytiques et Biologiques, Université Paris-Saclay, 92296 Châtenay-Malabry, France
| | - Damien Lannoy
- CHU Lille, Institut de Pharmacie, F-59000 Lille, France;
- ULR7365—GRITA—Groupe de Recherche Sur Les Formes Injectables et Les Technologies Associées, Universit Lille, F-59000 Lille, France
| | - Leen Van Simaey
- Laboratory Bacteriology Research, Faculty of Medicine & Health Sciences, Ghent University, C. Heymanslaan 10, B-9000 Gent, Belgium; (L.V.S.); (H.D.); (M.V.)
| | - Hans Duyvejonck
- Laboratory Bacteriology Research, Faculty of Medicine & Health Sciences, Ghent University, C. Heymanslaan 10, B-9000 Gent, Belgium; (L.V.S.); (H.D.); (M.V.)
- Research Center Health & Water Technology, University College Ghent, Keramiekstraat 80, B-9000 Gent, Belgium;
| | - Romain Guillemain
- Service d’Anesthésie-Réanimation, Hôpital Européen Georges Pompidou, 75015 Paris, France;
| | - Caroline Thumerelle
- Pediatric Pulmonology and Allergy Unit, Hôpital Jeanne de Flandre, University Lille, CHU Lille, F-59000 Lille, France;
| | - Isabelle Podglajen
- Université de Paris, F-75006 Paris, France; (I.P.); (F.C.); (J.-L.M.)
- Service de Microbiologie, AP-HP, Hôpital Européen Georges Pompidou, 20 rue Leblanc, 75015 Paris, France
| | - Fabrice Compain
- Université de Paris, F-75006 Paris, France; (I.P.); (F.C.); (J.-L.M.)
- Service de Microbiologie, AP-HP, Hôpital Européen Georges Pompidou, 20 rue Leblanc, 75015 Paris, France
| | - Najiby Kassis
- Unité d'Hygiène Hospitalière, Service de Microbiologie, Hôpital Européen Georges Pompidou, AP-HP, 75015 Paris, France;
| | - Jean-Luc Mainardi
- Université de Paris, F-75006 Paris, France; (I.P.); (F.C.); (J.-L.M.)
- Service de Microbiologie, AP-HP, Hôpital Européen Georges Pompidou, 20 rue Leblanc, 75015 Paris, France
| | - Johannes Wittmann
- Leibniz Institute DSMZ—German Collection of Microorganisms and Cell Cultures GmbH, Inhoffenstraße 7B, 38124 Braunschweig, Germany; (J.W.); (C.R.)
| | - Christine Rohde
- Leibniz Institute DSMZ—German Collection of Microorganisms and Cell Cultures GmbH, Inhoffenstraße 7B, 38124 Braunschweig, Germany; (J.W.); (C.R.)
| | - Jean-Paul Pirnay
- Laboratory Molecular and Cellular Technology, Queen Astrid Military Hospital, Bruynstraat 1, B-1120 Brussels, Belgium; (M.M.); (J.-P.P.)
| | - Nicolas Dufour
- Service de Réanimation Médico-Chirurgicale, Centre Hospitalier René Dubos, 95300 Pontoise, France;
| | - Stefan Vermeulen
- Research Center Health & Water Technology, University College Ghent, Keramiekstraat 80, B-9000 Gent, Belgium;
| | - Yannick Gansemans
- Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, B-9000 Gent, Belgium; (Y.G.); (F.V.N.)
| | - Filip Van Nieuwerburgh
- Laboratory of Pharmaceutical Biotechnology, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, B-9000 Gent, Belgium; (Y.G.); (F.V.N.)
| | - Mario Vaneechoutte
- Laboratory Bacteriology Research, Faculty of Medicine & Health Sciences, Ghent University, C. Heymanslaan 10, B-9000 Gent, Belgium; (L.V.S.); (H.D.); (M.V.)
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De Blaiser C, Roosen P, Willems T, De Bleecker C, Vermeulen S, Danneels L, De Ridder R. The role of core stability in the development of non-contact acute lower extremity injuries in an athletic population: A prospective study. Phys Ther Sport 2020; 47:165-172. [PMID: 33302113 DOI: 10.1016/j.ptsp.2020.11.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 11/21/2020] [Accepted: 11/24/2020] [Indexed: 01/28/2023]
Abstract
OBJECTIVES Stability of the core is associated with lower extremity functioning. Consequently, impaired core stability might play a role in developing non-contact acute lower extremity sports injuries. The objective was to investigate components of core stability as potential risk factors for acute lower extremity injuries. DESIGN A cohort study was set up with a follow-up and injury registration period of 1.5 years. PARTICIPANTS 142 male and female physical education students were included. MAIN OUTCOME MEASURES Measures of isometric hip and core muscular strength, endurance, proprioception and neuromuscular control of the core, and postural control were taken at the start of the study. Sports-related injury occurrence was registered during follow-up. RESULTS 27 (19%) injuries of interest occurred during follow-up. After multivariate model building, a significant predictive effect was found for side-to-side hip abduction strength asymmetry (p = .007). The hazard of developing an acute lower extremity injury increased with 6.2% with a 1 unit increase in side-to-side strength imbalance, regardless of gender. CONCLUSION Hip abduction strength imbalance was determined as a risk factor for the development of non-contact, acute lower extremity injuries. Normalizing hip strength imbalances might be beneficial for injury prevention. However, further research is needed to support this claim.
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Affiliation(s)
- Cedric De Blaiser
- Department of Rehabilitation Sciences, Ghent University, 9000, Ghent, Belgium.
| | - Philip Roosen
- Department of Rehabilitation Sciences, Ghent University, 9000, Ghent, Belgium
| | - Tine Willems
- Department of Rehabilitation Sciences, Ghent University, 9000, Ghent, Belgium
| | - Camilla De Bleecker
- Department of Rehabilitation Sciences, Ghent University, 9000, Ghent, Belgium
| | - Stefan Vermeulen
- Department of Rehabilitation Sciences, Ghent University, 9000, Ghent, Belgium
| | - Lieven Danneels
- Department of Rehabilitation Sciences, Ghent University, 9000, Ghent, Belgium
| | - Roel De Ridder
- Department of Rehabilitation Sciences, Ghent University, 9000, Ghent, Belgium
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Vermeulen S, De Mits S, De Ridder R, Calders P, De Schepper J, Malfait F, Rombaut L. Altered multi‐segment ankle and foot kinematics during gait in patients with Hypermobile Ehlers‐Danlos Syndrome/Hypermobility spectrum disorder. A case‐control study. Arthritis Care Res (Hoboken) 2020; 74:841-848. [DOI: 10.1002/acr.24526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 10/21/2020] [Accepted: 12/01/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Stefan Vermeulen
- Department of Rehabilitation Sciences Ghent University Ghent Belgium
| | - Sophie De Mits
- Department of Rheumatology Ghent University Hospital Ghent Belgium
- Department of Podiatry Artevelde University of Applied Sciences Ghent Belgium
| | - Roel De Ridder
- Department of Rehabilitation Sciences Ghent University Ghent Belgium
| | - Patrick Calders
- Department of Rehabilitation Sciences Ghent University Ghent Belgium
| | - Joris De Schepper
- Department of Podiatry Artevelde University of Applied Sciences Ghent Belgium
| | | | - Lies Rombaut
- Center for Medical Genetics Ghent University Hospital Ghent Belgium
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De Bleecker C, Vermeulen S, De Blaiser C, Willems T, De Ridder R, Roosen P. Relationship Between Jump-Landing Kinematics and Lower Extremity Overuse Injuries in Physically Active Populations: A Systematic Review and Meta-Analysis. Sports Med 2020; 50:1515-1532. [DOI: 10.1007/s40279-020-01296-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rodríguez A, Duyvejonck H, Van Belleghem JD, Gryp T, Van Simaey L, Vermeulen S, Van Mechelen E, Vaneechoutte M. Comparison of procedures for RNA-extraction from peripheral blood mononuclear cells. PLoS One 2020; 15:e0229423. [PMID: 32084228 PMCID: PMC7034890 DOI: 10.1371/journal.pone.0229423] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 02/05/2020] [Indexed: 02/06/2023] Open
Abstract
RNA quality and quantity are important factors for ensuring the accuracy of gene expression analysis and other RNA-based downstream applications. Thus far, only a limited number of methodological studies have compared sample storage and RNA extraction procedures for human cells. We compared three commercially available RNA extraction kits, i.e., (NucliSENS) easyMAG, RNeasy (Mini Kit) and RiboPure (RNA Purification Kit–blood). In addition, additional conditions, such as storage medium and storage temperature of human peripheral blood mononuclear cells were evaluated, i.e., 4 °C for RNAlater or -80 °C for QIAzol and for the respective cognate lysis buffers; easyMAG, RNeasy or RiboPure. RNA was extracted from aliquots that had been stored for one day (Run 1) or 83 days (Run 2). After DNase treatment, quantity and quality of RNA were assessed by means of a NanoDrop spectrophotometer, 2100 Bioanalyzer and RT-qPCR for the ACTB reference gene. We observed that high-quality RNA can be obtained using RNeasy and RiboPure, regardless of the storage medium, whereas samples stored in RNAlater resulted in the least amount of RNA extracted. In addition, RiboPure combined with storage of samples in its cognate lysis buffer yielded twice as much RNA as all other procedures. These results were supported by RT-qPCR and by the reproducibility observed for two independent extraction runs.
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Affiliation(s)
- Antonio Rodríguez
- Laboratory Bacteriology Research, Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- * E-mail:
| | - Hans Duyvejonck
- Laboratory Bacteriology Research, Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Department of Biosciences, Faculty of Education, Health and Social Work, University College Ghent, Ghent, Belgium
| | - Jonas D. Van Belleghem
- Laboratory Bacteriology Research, Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
- Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Tessa Gryp
- Laboratory Bacteriology Research, Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Leen Van Simaey
- Laboratory Bacteriology Research, Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
| | - Stefan Vermeulen
- Department of Biosciences, Faculty of Education, Health and Social Work, University College Ghent, Ghent, Belgium
| | - Els Van Mechelen
- Department of Biosciences, Faculty of Education, Health and Social Work, University College Ghent, Ghent, Belgium
| | - Mario Vaneechoutte
- Laboratory Bacteriology Research, Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium
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Duyvejonck H, Merabishvili M, Pirnay JP, De Vos D, Verbeken G, Van Belleghem J, Gryp T, De Leenheer J, Van der Borght K, Van Simaey L, Vermeulen S, Van Mechelen E, Vaneechoutte M. Development of a qPCR platform for quantification of the five bacteriophages within bacteriophage cocktail 2 (BFC2). Sci Rep 2019; 9:13893. [PMID: 31554892 PMCID: PMC6761158 DOI: 10.1038/s41598-019-50461-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 09/05/2019] [Indexed: 11/09/2022] Open
Abstract
To determine phage titers accurately, reproducibly and in a non-laborious and cost-effective manner, we describe the development of a qPCR platform for molecular quantification of five phages present in bacteriophage cocktail 2 (BFC2). We compared the performance of this molecular approach, with regard to quantification and reproducibility, with the standard culture-based double agar overlay method (DAO). We demonstrated that quantification of each of the five phages in BFC2 was possible by means of qPCR, without prior DNA extraction, but yields were significantly higher in comparison to DAO. Although DAO is assumed to provide an indication of the number of infective phage particles, whereas qPCR only provides information on the number of phage genomes, the difference in yield (qPCR/DAO ratio) was observed to be phage-dependent and appeared rather constant for all phages when analyzing different (freshly prepared) stocks of these phages. While DAO is necessary to determine sensitivity of clinical strains against phages in clinical applications, qPCR might be a valid alternative for rapid and reproducible quantification of freshly prepared stocks, after initial establishment of a correction factor towards DAO.
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Affiliation(s)
- Hans Duyvejonck
- Laboratory Bacteriology Research (LBR), Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, 9000, Ghent, Belgium. .,Department of Biosciences, Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, 9000, Ghent, Belgium.
| | - Maya Merabishvili
- Laboratory Bacteriology Research (LBR), Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, 9000, Ghent, Belgium.,Laboratory for Molecular and Cellular Technology (LabMCT), Burn Wound Center, Queen Astrid Military Hospital, Bruynstraat 1, 1120, Brussels, Belgium.,The Eliava Institute of Bacteriophages, Microbiology and Virology, Gotua 3, Tbilisi, 0160, Georgia
| | - Jean-Paul Pirnay
- Laboratory for Molecular and Cellular Technology (LabMCT), Burn Wound Center, Queen Astrid Military Hospital, Bruynstraat 1, 1120, Brussels, Belgium
| | - Daniel De Vos
- Laboratory for Molecular and Cellular Technology (LabMCT), Burn Wound Center, Queen Astrid Military Hospital, Bruynstraat 1, 1120, Brussels, Belgium
| | - Gilbert Verbeken
- Laboratory for Molecular and Cellular Technology (LabMCT), Burn Wound Center, Queen Astrid Military Hospital, Bruynstraat 1, 1120, Brussels, Belgium
| | - Jonas Van Belleghem
- Laboratory Bacteriology Research (LBR), Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, 9000, Ghent, Belgium
| | - Tessa Gryp
- Laboratory Bacteriology Research (LBR), Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, 9000, Ghent, Belgium
| | - Julie De Leenheer
- Department of Biosciences, Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, 9000, Ghent, Belgium
| | - Kelly Van der Borght
- Department of Biosciences, Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, 9000, Ghent, Belgium
| | - Leen Van Simaey
- Laboratory Bacteriology Research (LBR), Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, 9000, Ghent, Belgium
| | - Stefan Vermeulen
- Department of Biosciences, Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, 9000, Ghent, Belgium
| | - Els Van Mechelen
- Department of Biosciences, Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, 9000, Ghent, Belgium
| | - Mario Vaneechoutte
- Laboratory Bacteriology Research (LBR), Department of Diagnostic Sciences, Faculty of Medicine and Health Sciences, Ghent University, Corneel Heymanslaan 10, 9000, Ghent, Belgium
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Lison D, Van Maele-Fabry G, Vral A, Vermeulen S, Bastin P, Haufroid V, Baeyens A. Absence of genotoxic impact assessed by micronucleus frequency in circulating lymphocytes of workers exposed to cadmium. Toxicol Lett 2019; 303:72-77. [DOI: 10.1016/j.toxlet.2018.12.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Revised: 12/10/2018] [Accepted: 12/28/2018] [Indexed: 12/16/2022]
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Vermeulen S, Faure M, Luyckx E, Salgado R, Parizel P. Incidental CT finding of myocardial calcifications following severe septic shock. J Cardiovasc Comput Tomogr 2018; 12:e7-e8. [DOI: 10.1016/j.jcct.2017.09.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 09/08/2017] [Accepted: 09/20/2017] [Indexed: 10/18/2022]
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De Keukeleire S, Muylle K, Tsoumalis G, Vermeulen S, Vogelaers D. Primary hyperparathyroidism associated to thrombocytopenia: an issue to consider? ACTA ACUST UNITED AC 2017; 14:97-100. [PMID: 28740534 DOI: 10.11138/ccmbm/2017.14.1.097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Primary hyperparathyroidism (PHPT) is probably the most common endocrine disorder of the parathyroid glands, causing hypercalcemia. It is diagnosed often in persons with elevated serum calcium levels. However, hematological manifestations, such as thrombocytopenia are less known. In this case we describe the possible association of PHPT with reversible thrombocytopenia after parathyroidectomy. This hematological abnormality can be included in the spectrum of possible causes, including seemingly non-specific symptoms, in the decision tree towards surgical assessment.
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Affiliation(s)
| | - Kristoff Muylle
- Department of Nuclear Medicine, AZ Sint-Jan Bruges-Ostend, Ostend, Belgium
| | - Georgios Tsoumalis
- Department of Endocrinology - Internal Medicine, AZ Sint-Jan Bruges-Ostend, Belgium
| | - Stefan Vermeulen
- Department of Biomedical Sciences, Faculty of Education, Health & Social Work, University College Ghent, Belgium
| | - Dirk Vogelaers
- Department of General Internal Medicine, Ghent University Hospital, Ghent, Belgium
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Feys L, Descamps B, Vanhove C, Vral A, Veldeman L, Vermeulen S, De Wagter C, Bracke M, De Wever O. Radiation-induced lung damage promotes breast cancer lung-metastasis through CXCR4 signaling. Oncotarget 2016; 6:26615-32. [PMID: 26396176 PMCID: PMC4694940 DOI: 10.18632/oncotarget.5666] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 08/29/2015] [Indexed: 12/29/2022] Open
Abstract
Radiotherapy is a mainstay in the postoperative treatment of breast cancer as it reduces the risks of local recurrence and mortality after both conservative surgery and mastectomy. Despite recent efforts to decrease irradiation volumes through accelerated partial irradiation techniques, late cardiac and pulmonary toxicity still occurs after breast irradiation. The importance of this pulmonary injury towards lung metastasis is unclear. Preirradiation of lung epithelial cells induces DNA damage, p53 activation and a secretome enriched in the chemokines SDF-1/CXCL12 and MIF. Irradiated lung epithelial cells stimulate adhesion, spreading, growth, and (transendothelial) migration of human MDA-MB-231 and murine 4T1 breast cancer cells. These metastasis-associated cellular activities were largely mimicked by recombinant CXCL12 and MIF. Moreover, an allosteric inhibitor of the CXCR4 receptor prevented the metastasis-associated cellular activities stimulated by the secretome of irradiated lung epithelial cells. Furthermore, partial (10%) irradiation of the right lung significantly stimulated breast cancer lung-specific metastasis in the syngeneic, orthotopic 4T1 breast cancer model. Our results warrant further investigation of the potential pro-metastatic effects of radiation and indicate the need to develop efficient drugs that will be successful in combination with radiotherapy to prevent therapy-induced spread of cancer cells.
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Affiliation(s)
- Lynn Feys
- Department of Radiation Oncology and Experimental Cancer Research, Laboratory of Experimental Cancer Research, Ghent University, Ghent, Belgium
| | - Benedicte Descamps
- Department of Electronics and Information System, iMinds-IBiTech-MEDISIP, Ghent University, Ghent, Belgium
| | - Christian Vanhove
- Department of Electronics and Information System, iMinds-IBiTech-MEDISIP, Ghent University, Ghent, Belgium
| | - Anne Vral
- Department of Basic Medical Sciences, Physiology Group, Ghent University, Ghent, Belgium
| | - Liv Veldeman
- Department of Radiation Oncology and Experimental Cancer Research, Gent University Hospital, Ghent, Belgium
| | | | - Carlos De Wagter
- Department of Radiation Oncology and Experimental Cancer Research, Gent University Hospital, Ghent, Belgium
| | - Marc Bracke
- Department of Radiation Oncology and Experimental Cancer Research, Laboratory of Experimental Cancer Research, Ghent University, Ghent, Belgium
| | - Olivier De Wever
- Department of Radiation Oncology and Experimental Cancer Research, Laboratory of Experimental Cancer Research, Ghent University, Ghent, Belgium
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Vermeesch JR, Melotte C, Froyen G, Van Vooren S, Dutta B, Maas N, Vermeulen S, Menten B, Speleman F, De Moor B, Van Hummelen P, Marynen P, Fryns JP, Devriendt K. Molecular Karyotyping: Array CGH Quality Criteria for Constitutional Genetic Diagnosis. J Histochem Cytochem 2016; 53:413-22. [PMID: 15750031 DOI: 10.1369/jhc.4a6436.2005] [Citation(s) in RCA: 129] [Impact Index Per Article: 16.1] [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: 01/15/2023] Open
Abstract
Array CGH (comparative genomic hybridization) enables the identification of chromosomal copy number changes. The availability of clone sets covering the human genome opens the possibility for the widespread use of array CGH for both research and diagnostic purposes. In this manuscript we report on the parameters that were critical for successful implementation of the technology, assess quality criteria, and discuss the potential benefits and pitfalls of the technology for improved pre- and postnatal constitutional genetic diagnosis. We propose to name the genome-wide array CGH “molecular karyotyping,” in analogy with conventional karyotyping that uses staining methods to visualize chromosomes.
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De Keukeleire S, Wybo I, Naessens A, Echahidi F, Van der Beken M, Vandoorslaer K, Vermeulen S, Piérard D. Anaerobic bacteraemia: a 10-year retrospective epidemiological survey. Anaerobe 2016; 39:54-9. [PMID: 26923749 DOI: 10.1016/j.anaerobe.2016.02.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [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: 12/12/2015] [Revised: 02/17/2016] [Accepted: 02/22/2016] [Indexed: 10/22/2022]
Abstract
In order to identify current trends in anaerobic bacteraemia, a 10-year retrospective study was performed in the University Hospital Brussel, Belgium. All clinically relevant bacteraemia detected from 2004 until 2013 were included. Medical records were reviewed in an attempt to define clinical parameters that might be associated with the occurrence of anaerobic bacteraemia. 437 of the isolated organisms causing anaerobic bacteraemia were thawed, subcultured and reanalyzed using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF). There were an average of 33 cases of anaerobic bacteraemia per year during 2004-2008 compared to an average of 27 cases per year during 2009-2013 (P = 0.017), corresponding to a decrease by 19% between the first and the latter period. Also, the total number of cases of anaerobic bacteraemia per 100,000 patient days decreased from 17.3 in the period from 2004 to 2008 to 13.7 in the period 2009 to 2013 (P = 0.023). Additionally, the mean incidence of anaerobic bacteraemia decreased during the study period (1.27/1000 patients in 2004 vs. 0.94/1000 patients in 2013; P = 0.008). In contrast, the proportion of isolated anaerobic bacteraemia compared to the number of all bacteraemia remained stable at 5%. Bacteroides spp. and Parabacteroides spp. accounted for 47.1% of the anaerobes, followed by 14.4% Clostridium spp., 12.6% non-spore-forming Gram-positive rods, 10.5% anaerobic cocci, 8.2% Prevotella spp. and other Gram-negative rods and 7.1% Fusobacterium spp. The lower gastrointestinal tract (47%) and wound infections (10%) were the two most frequent sources for bacteraemia, with the origin remaining unknown in 62 cases (21%). The overall mortality rate was 14%. Further studies focusing on the antimicrobial susceptibility and demographic background of patients are needed to further objectify the currently observed trends.
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Affiliation(s)
- Steven De Keukeleire
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium.
| | - Ingrid Wybo
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Anne Naessens
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Fedoua Echahidi
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Mieke Van der Beken
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Kristof Vandoorslaer
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Stefan Vermeulen
- Department of Biomedical Sciences, Faculty of Education, Health & Social Work, University College Ghent, Belgium
| | - Denis Piérard
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium
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Feys L, Descamps B, Vanhove C, Vermeulen S, Vandesompele JO, Vanderheyden K, Messens K, Bracke M, De Wever O. Quantitative and Functional Requirements for Bioluminescent Cancer Models. In Vivo 2016; 30:1-11. [PMID: 26709122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
BACKGROUND Bioluminescent cancer models are widely used but detailed quantification of the luciferase signal and functional comparison with a non-transfected control cell line are generally lacking. In the present study, we provide quantitative and functional tests for luciferase-transfected cells. MATERIALS AND METHODS We quantified the luciferase expression in BLM and HCT8/E11 transfected cancer cells, and examined the effect of long-term luciferin exposure. The present study also investigated functional differences between parental and transfected cancer cells. RESULTS Our results showed that quantification of different single-cell-derived populations are superior with droplet digital polymerase chain reaction. Quantification of luciferase protein level and luciferase bioluminescent activity is only useful when there is a significant difference in copy number. Continuous exposure of cell cultures to luciferin leads to inhibitory effects on mitochondrial activity, cell growth and bioluminescence. These inhibitory effects correlate with luciferase copy number. Cell culture and mouse xenograft assays showed no significant functional differences between luciferase-transfected and parental cells. CONCLUSION Luciferase-transfected cells should be validated by quantitative and functional assays before starting large-scale experiments.
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Affiliation(s)
- Lynn Feys
- Laboratory of Experimental Cancer Research, Department of Radiation Oncology and Experimental Cancer Research, Ghent University, Ghent, Belgium
| | - Benedicte Descamps
- iMinds-IBiTech-MEDISIP, Department of Electronics and Information System, Ghent University, Ghent, Belgium
| | - Christian Vanhove
- iMinds-IBiTech-MEDISIP, Department of Electronics and Information System, Ghent University, Ghent, Belgium
| | | | | | | | - Kathy Messens
- Department of Applied Biosciences, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Marc Bracke
- Laboratory of Experimental Cancer Research, Department of Radiation Oncology and Experimental Cancer Research, Ghent University, Ghent, Belgium
| | - Olivier De Wever
- Laboratory of Experimental Cancer Research, Department of Radiation Oncology and Experimental Cancer Research, Ghent University, Ghent, Belgium
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Duyvejonck H, Cools P, Decruyenaere J, Roelens K, Noens L, Vermeulen S, Claeys G, Decat E, Van Mechelen E, Vaneechoutte M. Correction: Validation of High Resolution Melting Analysis (HRM) of the Amplified ITS2 Region for the Detection and Identification of Yeasts from Clinical Samples: Comparison with Culture and MALDI-TOF Based Identification. PLoS One 2015; 10:e0139501. [PMID: 26406230 PMCID: PMC4583272 DOI: 10.1371/journal.pone.0139501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Duyvejonck H, Cools P, Decruyenaere J, Roelens K, Noens L, Vermeulen S, Claeys G, Decat E, Van Mechelen E, Vaneechoutte M. Validation of High Resolution Melting Analysis (HRM) of the Amplified ITS2 Region for the Detection and Identification of Yeasts from Clinical Samples: Comparison with Culture and MALDI-TOF Based Identification. PLoS One 2015; 10:e0132149. [PMID: 26295947 PMCID: PMC4546670 DOI: 10.1371/journal.pone.0132149] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 06/10/2015] [Indexed: 11/18/2022] Open
Abstract
AIM Candida species are known as opportunistic pathogens, and a possible cause of invasive infections. Because of their species-specific antimycotic resistance patterns, reliable techniques for their detection, quantification and identification are needed. We validated a DNA amplification method for direct detection of Candida spp. from clinical samples, namely the ITS2-High Resolution Melting Analysis (direct method), by comparing it with a culture and MALDI-TOF Mass Spectrometry based method (indirect method) to establish the presence of Candida species in three different types of clinical samples. MATERIALS AND METHODS A total of 347 clinical samples, i.e. throat swabs, rectal swabs and vaginal swabs, were collected from the gynaecology/obstetrics, intensive care and haematology wards at the Ghent University Hospital, Belgium. For the direct method, ITS2-HRM was preceded by NucliSENS easyMAG DNA extraction, directly on the clinical samples. For the indirect method, clinical samples were cultured on Candida ID and individual colonies were identified by MALDI-TOF. RESULTS For 83.9% of the samples there was complete concordance between both techniques, i.e. the same Candida species were detected in 31.1% of the samples or no Candida species were detected in 52.8% of the samples. In 16.1% of the clinical samples, discrepant results were obtained, of which only 6.01% were considered as major discrepancies. Discrepancies occurred mostly when overall numbers of Candida cells in the samples were low and/or when multiple species were present in the sample. DISCUSSION Most of the discrepancies could be decided in the advantage of the direct method. This is due to samples in which no yeast could be cultured whereas low amounts could be detected by the direct method and to samples in which high quantities of Candida robusta according to ITS2-HRM were missed by culture on Candida ID agar. It remains to be decided whether the diagnostic advantages of the direct method compensate for its disadvantages.
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Affiliation(s)
- Hans Duyvejonck
- Laboratory Bacteriology Research, Department of Clinical Chemistry, Microbiology and Immunology, Faculty of Medicine and Health Sciences, University of Ghent, De Pintelaan 185, 9000, Ghent, Belgium
- Department of Biomedical Sciences, Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, 9000, Ghent, Belgium
| | - Piet Cools
- Laboratory Bacteriology Research, Department of Clinical Chemistry, Microbiology and Immunology, Faculty of Medicine and Health Sciences, University of Ghent, De Pintelaan 185, 9000, Ghent, Belgium
| | - Johan Decruyenaere
- Department of Intensive Care Medicine, Ghent University Hospital, De Pintelaan 185, 9000, Ghent, Belgium
| | - Kristien Roelens
- Department of Obstetrics and Gynaecology, Faculty of Medicine and Health Sciences, Ghent University Hospital, 9000, Ghent, Belgium
| | - Lucien Noens
- Department of Haematology and Blood Bank, Ghent University Hospital, 9000, Ghent, Belgium
| | - Stefan Vermeulen
- Department of Biomedical Sciences, Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, 9000, Ghent, Belgium
| | - Geert Claeys
- Department of Clinical Chemistry, Microbiology and Immunology, Ghent University Hospital, De Pintelaan 185, 9000, Ghent, Belgium
| | - Ellen Decat
- Laboratory Bacteriology Research, Department of Clinical Chemistry, Microbiology and Immunology, Faculty of Medicine and Health Sciences, University of Ghent, De Pintelaan 185, 9000, Ghent, Belgium
| | - Els Van Mechelen
- Department of Biomedical Sciences, Faculty of Education, Health and Social Work, University College Ghent, Keramiekstraat 80, 9000, Ghent, Belgium
| | - Mario Vaneechoutte
- Laboratory Bacteriology Research, Department of Clinical Chemistry, Microbiology and Immunology, Faculty of Medicine and Health Sciences, University of Ghent, De Pintelaan 185, 9000, Ghent, Belgium
- * E-mail:
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Faber TE, Kamps AW, Sjoerdsma MH, Vermeulen S, Veeger NJ, Bont LJ. Computerized Assessment of Wheezing in Children With Respiratory Syncytial Virus Bronchiolitis Before and After Hypertonic Saline Nebulization. Respir Care 2015; 60:1252-6. [DOI: 10.4187/respcare.03754] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Vermeulen S, Barreto M, La Penna F, Prete A, Martella S, Biagiarelli F, Villa MP. Exhaled breath temperature in children: reproducibility and influencing factors. J Asthma 2014; 51:743-50. [PMID: 24654705 DOI: 10.3109/02770903.2014.906606] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE This study will investigate the reproducibility and influencing factors of exhaled breath temperature measured with the tidal breathing technique in asthmatic patients and healthy children. METHODS Exhaled breath temperature, fractional exhaled nitric oxide, and spirometry were assessed in 124 children (63 healthy and 61 asthmatic), aged 11.2 ± 2.5 year, M/F 73/51. A modified version of the American Thoracic Society questionnaire on the child's present and past respiratory history was obtained from parents. Parents were also asked to provide detailed information on their child's medication use during the previous 4 weeks. Ear temperature, ambient temperature, and relative-ambient humidity were also recorded. RESULTS Exhaled breath temperature measurements were highly reproducible; the second measurement was higher than the first measurement, consistent with a test-retest situation. In 13 subjects, between-session within-day reproducibility of exhaled breath temperature was still high. Exhaled breath temperature increased with age and relative-ambient humidity. Exhaled breath temperature was comparable in healthy and asthmatic children; when adjusted for potential confounders (i.e. ambient conditions and subject characteristics), thermal values of asthmatic patients exceeded those of the healthy children by 1.1 °C. Normalized exhaled breath temperature, by subtracting ambient temperature, was lower in asthmatic patients treated with inhaled corticosteroids than in those who were corticosteroid-naive. CONCLUSION Measurements of exhaled breath temperature are highly reproducible, yet influenced by several factors. Corrected values, i.e. normalized exhaled breath temperature, could help us to assess the effect of therapy with inhaled corticosteroids. More studies are needed to improve the usefulness of the exhaled breath temperature measured with the tidal breathing technique in children.
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Affiliation(s)
- S Vermeulen
- Faculty of Medical Sciences, University of Groningen , Groningen , The Netherlands and
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Bossini-Castillo L, de Kovel C, Kallberg H, van ‘t Slot R, Italiaander A, Coenen M, Tak PP, Posthumus MD, Wijmenga C, Huizinga T, van der Helm-van Mil AHM, Stoeken-Rijsbergen G, Rodriguez-Rodriguez L, Balsa A, González-Álvaro I, González-Gay MÁ, Gómez-Vaquero C, Franke B, Vermeulen S, van der Horst-Bruinsma IE, Dijkmans BAC, Wolbink GJ, Ophoff RA, Maehlen MT, van Riel P, Merriman M, Klareskog L, Lie BA, Merriman T, Crusius JBA, Brouwer E, Martin J, de Vries N, Toes R, Padyukov L, Koeleman BPC. A genome-wide association study of rheumatoid arthritis without antibodies against citrullinated peptides. Ann Rheum Dis 2014; 74:e15. [DOI: 10.1136/annrheumdis-2013-204591] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Decat E, Cosyn J, De Bruyn H, Miremadi R, Saerens B, Van Mechelen E, Vermeulen S, Vaneechoutte M, Deschaght P. Optimization of quantitative polymerase chain reactions for detection and quantification of eight periodontal bacterial pathogens. BMC Res Notes 2012. [PMID: 23199017 PMCID: PMC3532386 DOI: 10.1186/1756-0500-5-664] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Background The aim of this study was to optimize quantitative (real-time) polymerase chain reaction (qPCR) assays for 8 major periodontal pathogens, i.e. Aggregatibacter actinomycetemcomitans, Fusobacterium nucleatum, Parvimonas micros, Porphyromonas gingivalis, Prevotella intermedia, Tanerella forsythia and Treponema denticola, and of the caries pathogen Streptococcus mutans. Results Eighteen different primer pairs were analyzed in silico regarding specificity (using BLAST analysis) and the presence of secondary structures at primer binding sites (using mFOLD). The most specific and efficiently binding primer pairs, according to these analyses, were selected for qPCR-analysis to determine amplification efficiency, limit of quantification and intra-run reproducibility. For the selected primer pairs, one for each species, the specificity was confirmed by assessing amplification of DNA extracts from isolates of closely related species. For these primer pairs, the intercycler portability was evaluated on 3 different thermal cyclers (the Applied Biosystems 7300, the Bio-Rad iQ5 and the Roche Light Cycler 480). For all assays on the different cyclers, a good correlation of the standard series was obtained (i.e. r2 ≥ 0.98), but quantification limits varied among cyclers. The overall best quantification limit was obtained by using a 2 μl sample in a final volume of 10 μl on the Light Cycler 480. Conclusions In conclusion, the proposed assays allow to quantify the bacterial loads of S. mutans, 6 periodontal pathogenic species and the genus Fusobacterium.This can be of use in assessing periodontal risk, determination of the optimal periodontal therapy and evaluation of this treatment.
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Affiliation(s)
- Ellen Decat
- Biomedical and Exact Sciences, Faculty of Education, Health&Social Work, University College Ghent, Keramiekstraat 80, Ghent, Belgium.
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Vermeulen S, Ketels P, Salgado R, Creytens D, Vanderveken OM, Claes J. Solitary fibrous tumour of the nasal cavity: a case report and literature review. B-ENT 2012; 8:219-223. [PMID: 23113387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023] Open
Abstract
A solitary fibrous tumour (SFT) is a rare tumour that originates from the mesenchyme and arises mainly in the pleura. In this report, we present a rare case of a 77-year-old man with a SFT in the left nasal cavity. On CT and MRI, a large mass is seen in the left nasal cavity, extending to the choana. The mass was radically resected via functional endoscopic sinus surgery (FESS). Histological examination showed a fibroblastic mesenchymal tumour with a prominent hemangiopericytic vascular branching pattern that stained diffusely positive for the immunohistochemical markers CD34, Bcl-2, and CD99, which was compatible with the histopathological diagnosis of a SFT. Imaging and histological features are discussed, along with the reports in literature, clinical management, and follow-up of this pathology.
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Affiliation(s)
- S Vermeulen
- Department of Otorhinolaryngology and Head & Neck Surgery, Antwerp University Hospital, Edegem, Belgium.
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Santos R, Vermeulen S, Haritova A, Fink-Gremmels J. Isotherm modeling of organic activated bentonite and humic acid polymer used as mycotoxin adsorbents. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2011; 28:1578-89. [DOI: 10.1080/19440049.2011.595014] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Shiu A, Wang C, Ye J, Cotrutz C, Meier R, Mehta V, Vermeulen S, Chang E. Dose Distribution Comparison for the IGRT Treatment Using CyberKnife Versus LINAC IMRT Stereotactic Body Radiotherapy. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.2056] [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: 11/16/2022]
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Menten B, Buysse K, Vermeulen S, Meersschaut V, Vandesompele J, Ng BL, Carter NP, Mortier GR, Speleman F. Report of a female patient with mental retardation and tall stature due to a chromosomal rearrangement disrupting the OPHN1 gene on Xq12. Eur J Med Genet 2007; 50:446-54. [PMID: 17845870 PMCID: PMC2688819 DOI: 10.1016/j.ejmg.2007.07.003] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2007] [Accepted: 07/21/2007] [Indexed: 10/23/2022]
Abstract
We report on a patient with mental retardation, seizures and tall stature with advanced bone age in whom a de novo apparently balanced chromosomal rearrangement 46,XX,t(X;9)(q12;p13.3) was identified. Using array CGH on flow-sorted derivative chromosomes (array painting) and subsequent FISH and qPCR analysis, we mapped and sequenced both breakpoints. The Xq12 breakpoint was located within the gene coding for oligophrenin 1 (OPHN1) whereas the 9p13.3 breakpoint was assigned to a non-coding segment within a gene dense region. Disruption of OPHN1 by the Xq12 breakpoint was considered the major cause of the abnormal phenotype observed in the proband.
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Affiliation(s)
- Björn Menten
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium.
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Gellekink H, Muntjewerff J, Vermeulen S, Hermus A, Blom H, den Heijer M. CATECHOL-O-METHYLTRANSFERASE GENOTYPE IS ASSOCIATED WITH PLASMA TOTAL HOMOCYSTEINE LEVELS AND MAY INCREASE RECURRENT VENOUS THROMBOSIS RISK. J Thromb Haemost 2007. [DOI: 10.1111/j.1538-7836.2007.tb02377.x] [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: 11/29/2022]
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Shiu A, Wang H, Ye J, Cotrutz C, Meier R, Mehta V, Vermeulen S, Chang E. SU-FF-T-164: Dose Distribution Comparison for the Treatment of Lung and Spinal Metastases Using CyberKnife Versus IMRT Stereotactic Body Radiotherapy. Med Phys 2007. [DOI: 10.1118/1.2760823] [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: 11/07/2022] Open
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Stevens-Kroef MJPL, Schoenmakers EFPM, van Kraaij M, Huys E, Vermeulen S, van der Reijden B, van Kessel AG. Identification of truncated RUNX1 and RUNX1-PRDM16 fusion transcripts in a case of t(1;21)(p36;q22)-positive therapy-related AML. Leukemia 2006; 20:1187-9. [PMID: 16598304 DOI: 10.1038/sj.leu.2404210] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
MESH Headings
- Acute Disease
- Chromosomes, Human, Pair 1
- Chromosomes, Human, Pair 21
- Core Binding Factor Alpha 2 Subunit/genetics
- DNA-Binding Proteins/genetics
- Fatal Outcome
- Female
- Humans
- Leukemia, Myeloid/diagnosis
- Leukemia, Myeloid/genetics
- Leukemia, Myeloid/therapy
- Middle Aged
- Oncogene Proteins, Fusion/genetics
- Reverse Transcriptase Polymerase Chain Reaction
- Transcription Factors/genetics
- Transcription, Genetic
- Translocation, Genetic
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Vermeulen S, Jansen Van Rensburg A, van der Merwe B, Shalvoy R, Willford S. The application of polymethylene waxes as conditioning agent in hair relaxers. Int J Cosmet Sci 2005. [DOI: 10.1111/j.1467-2494.2005.00257_15.x] [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: 11/27/2022]
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Courtens W, Vermeulen S, Wuyts W, Messiaen L, Wauters J, Nuytinck L, Peeters N, Storm K, Speleman F, Nöthen MM. An interstitial deletion of chromosome 7 at band q21: A case report and review. Am J Med Genet A 2005; 134A:12-23. [PMID: 15732063 DOI: 10.1002/ajmg.a.30106] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [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: 11/12/2022]
Abstract
We report on a girl with moderate developmental delay and mild dysmorphic features. Cytogenetic investigations revealed a de novo interstitial deletion at the proximal dark band on the long arm of chromosome 7 (7q21.1-q21.3) in all analyzed G-banded metaphases of lymphocytes and fibroblasts. Fluorescence in situ hybridization (FISH) and molecular studies defined the breakpoints at 7q21.11 and 7q21.3 on the paternal chromosome 7, with the proximal deletion breakpoint between the elastin gene (localized at 7q11.23) and D7S2517, and the distal breakpoint between D7S652 and the COL1A2 gene (localized at 7q21.3-q22.1). Deletions of interstitial segments at the proximal long arm of chromosome 7 at q21 are relatively rare. The karyotype-phenotype correlation of these patients is reviewed and discussed. The clinical findings of patients with a deletion at 7q21 significantly overlap with those of patients with maternal uniparental disomy of chromosome 7 (matUPD(7)) and Silver-Russell syndrome (SRS, OMIM 180860). Therefore, 7q21 might be considered a candidate chromosomal region for matUPD(7) and SRS.
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Affiliation(s)
- Winnie Courtens
- Department of Medical Genetics, University Hospital Antwerp, Antwerp, Belgium.
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Meier R, Mehta V, Vermeulen S, Young R. Dose-response and dose-complication relationships in stereotactic radiosurgery for trigeminal neuralgia. Int J Radiat Oncol Biol Phys 2004. [DOI: 10.1016/j.ijrobp.2004.07.516] [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: 11/30/2022]
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Vermeulen S, Menten B, Van Roy N, Van Limbergen H, De Paepe A, Mortier G, Speleman F. Molecular cytogenetic analysis of complex chromosomal rearrangements in patients with mental retardation and congenital malformations: delineation of 7q21.11 breakpoints. Am J Med Genet A 2004; 124A:10-8. [PMID: 14679581 DOI: 10.1002/ajmg.a.20378] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [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: 01/29/2023]
Abstract
Constitutional de novo complex chromosomal rearrangements (CCRs) are a rare finding in patients with mild to severe mental retardation. CCRs pose a challenge to the clinical cytogeneticist: generally CCRs are assumed to be the cause of the observed phenotypic abnormalities, but the complex nature of these chromosomal changes often hamper the accurate delineation of the chromosomal breakpoints and the identification of possible imbalances. In a first step towards a more detailed molecular cytogenetic characterization of CCRs, we studied four de novo CCRs using multicolor fluorescent in situ hybridization (M-FISH), comparative genomic hybridization (CGH), and FISH with region specific probes. These methods allowed a more refined characterization of the breakpoints in three of the four CCRs. The occurrence of 7q breakpoints in three out of these four CCRs and in 30% of reported CCRs suggested preferential involvement of this chromosomal region in the formation of CCRs. Further analysis of these 7q breakpoints revealed a 2 Mb deletion at 7q21.11 in one patient and involvement of the same region in a cryptic insertion in a second patient. This particular region contains at least 5 candidate genes for mental retardation. The other patient had a breakpoint more proximal to this region. The present data together with these from the literature provide evidence that a region within 7q21.11 may be prone to breakage and formation of CCRs.
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Affiliation(s)
- Stefan Vermeulen
- Center for Medical Genetics, Ghent University Hospital 0K5, De Pintelaan 185, 9000 Ghent, Belgium.
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Houge G, Liehr T, Schoumans J, Ness GO, Solland K, Starke H, Claussen U, Strømme P, Akre B, Vermeulen S. Ten years follow up of a boy with a complex chromosomal rearrangement: going from a > 5 to 15-breakpoint CCR. Am J Med Genet A 2003; 118A:235-40. [PMID: 12673653 DOI: 10.1002/ajmg.a.10106] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [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: 11/06/2022]
Abstract
A moderately mentally retarded 10-year-old boy of very short stature was found initially to have a complex chromosomal rearrangement (CCR) involving chromosome 1, 2, 3, 4, and 8. A balanced twelve-breakpoint CCR was suggested after extensive investigations including subtelomere FISH, whole chromosome paints, comparative genomic hybridization (CGH), multicolor FISH (MFISH), and spectral karyotyping (SKY). SKY and MFISH gave slightly discrepant results. For further clarification of the karyotype, multicolor banding (MCB) analysis and FISH with region-specific YAC probes were done. This allowed clarification of a sixteen-fragment CCR to be made, the most complex constitutional chromosomal rearrangement reported so far. Remarkably, two 'secondary' insertions originated from the interior of a 'primary' insertion by an excision/duplication event. The randomness of the fragments and the complexity of the derivative chromosomes suggest that this CCR is the result of a single meiotic event, e.g., faulty repair of a five-chromosome knot.
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Affiliation(s)
- Gunnar Houge
- Center for Medical Genetics and Molecular Medicine, Haukeland University Hospital, Bergen, Norway.
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Dodé C, Levilliers J, Dupont JM, De Paepe A, Le Dû N, Soussi-Yanicostas N, Coimbra RS, Delmaghani S, Compain-Nouaille S, Baverel F, Pêcheux C, Le Tessier D, Cruaud C, Delpech M, Speleman F, Vermeulen S, Amalfitano A, Bachelot Y, Bouchard P, Cabrol S, Carel JC, Delemarre-van de Waal H, Goulet-Salmon B, Kottler ML, Richard O, Sanchez-Franco F, Saura R, Young J, Petit C, Hardelin JP. Loss-of-function mutations in FGFR1 cause autosomal dominant Kallmann syndrome. Nat Genet 2003; 33:463-5. [PMID: 12627230 DOI: 10.1038/ng1122] [Citation(s) in RCA: 506] [Impact Index Per Article: 24.1] [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: 11/22/2002] [Accepted: 02/06/2003] [Indexed: 01/27/2023]
Abstract
We took advantage of overlapping interstitial deletions at chromosome 8p11-p12 in two individuals with contiguous gene syndromes and defined an interval of roughly 540 kb associated with a dominant form of Kallmann syndrome, KAL2. We establish here that loss-of-function mutations in FGFR1 underlie KAL2 whereas a gain-of-function mutation in FGFR1 has been shown to cause a form of craniosynostosis. Moreover, we suggest that the KAL1 gene product, the extracellular matrix protein anosmin-1, is involved in FGF signaling and propose that the gender difference in anosmin-1 dosage (because KAL1 partially escapes X inactivation) explains the higher prevalence of the disease in males.
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Affiliation(s)
- Catherine Dodé
- Institut Cochin et Laboratoire de Biochimie et Génétique Moléculaire, Hôpital Cochin, 75014 Paris, France
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Abstract
The chromosome-type exchange aberrations induced by ionizing radiation during the G(0)/G(1) phase of the cell cycle are believed to be the result of illegitimate rejoining of chromosome breaks. From numerous studies using chromosome painting, it has emerged that even after a moderate dose of radiation, a substantial fraction of these exchanges is complex. Most of them are derived from the free interaction between the ends of three or more breaks. Other studies have demonstrated that chromosomes occupy distinct territories in the interphase nucleus. Since breaks that are in close proximity have an enhanced interaction probability, it seems likely that after ionizing radiation many of the interacting breaks will be present within one chromosome or chromosome arm. Unfortunately, the majority of these intrachanges remain undetected, even when sophisticated molecular cytogenetic detection methods (i.e. mFISH) are applied to paint all chromosome pairs in distinct colors. In the present paper, we evaluate the limitations of full-color painting for the detection of complex exchanges and the correct interpretations of break interactions.
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Affiliation(s)
- J J W A Boei
- Department of Radiation Genetics and Chemical Mutagenesis, Leiden University Medical Center, Wassenaarseweg 72, P.O. Box 9503, Leiden, The Netherlands.
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Vermeulen S, Messiaen L, Scheir P, De Bie S, Speleman F, De Paepe A. Kallmann syndrome in a patient with congenital spherocytosis and an interstitial 8p11.2 deletion. Am J Med Genet 2002; 108:315-8. [PMID: 11920837 DOI: 10.1002/ajmg.10295] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We describe the hitherto smallest interstitial 8p11.2 deletion in a patient with congenital spherocytosis, dysmorphic features, and growth delay in association with hypogonadotropic hypogonadism and anosmia. The latter features are characteristic for Kallmann syndrome. In contrast to the previously reported patients with 8p deletions, the present patient showed normal intelligence. Congenital spherocytosis is one of the most common hereditary hemolytic anemias. One of the three loci for congenital spherocytosis was assigned to chromosome 8p (located between 8p11.1 and 8p21) and mutations in or loss of the ankyrin-1 gene (ANK1) were identified. Molecular analysis confirmed the de novo loss of ANK1 in our patient. Kallmann syndrome, which is characterized by hypogonadotropic hypogonadism and anosmia, can be X-linked, autosomal dominant, or autosomal recessive. So far only the X-linked KAL1 gene has been identified. The present finding suggests an autosomal locus for Kallmann syndrome at 8p11.2. The simultaneous occurrence of congenital spherocytosis, Kallmann syndrome phenotype, dysmorphic features, and growth delay in this patient points to a new contiguous gene syndrome.
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Affiliation(s)
- Stefan Vermeulen
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium.
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Laverge H, Vermeulen S, der Elst JV, Verschraegen-Spae MR, De Paepe A, Dhont M. O-44. Does embryo morphology allow selection of embryos for biopsy in PGD for Robertsonian translocation (13;14)? Reprod Biomed Online 2002. [DOI: 10.1016/s1472-6483(12)60063-7] [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: 11/26/2022]
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41
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Geraedts JP, Harper J, Braude P, Sermon K, Veiga A, Gianaroli L, Agan N, Munné S, Gitlin S, Blenow E, de Boer K, Hussey N, Traeger-Synodinos J, Lee SH, Viville S, Krey L, Ray P, Emiliani S, Liu YH, Vermeulen S, Kanavakis E. Preimplantation genetic diagnosis (PGD), a collaborative activity of clinical genetic departments and IVF centres. Prenat Diagn 2001; 21:1086-92. [PMID: 11746169 DOI: 10.1002/pd.249] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [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: 11/08/2022]
Abstract
Preimplantation genetic diagnosis (PGD) requires the combined efforts of geneticists and workers in the field of reproductive medicine. This was studied on the basis of a questionnaire, sent to 35 members of the PGD Consortium of the European Society of Human Reproduction and Embryology (ESHRE). A reply was obtained from 20 centres. They represent the majority of activities in the field of PGD in the world. It is obvious that many of the activities (in vitro fertilisation, embryo culture and biopsy) take place in IVF units while others (counselling and diagnosis) are the responsibility of genetic diagnostic centres. The distances between both units vary considerably. In all but one centre sex determination is offered. Aneuploidy screening is offered in 13 out of 20 centres. PGD of translocations and other structural chromosome abnormalities is offered in all but one centre. The number of monogenic diseases offered varies considerably. In comparison to prenatal diagnosis PGD is more expensive. The majority of these costs are due to the IVF or ICSI procedure. The charges for PGD vary between about 600 euro and 4000 euro. In 16 out of 20 centres the parents to be must sign an informed consent form.
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Affiliation(s)
- J P Geraedts
- Research Institute Growth and Development, Universiteit Maastricht, The Netherlands.
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Abstract
PURPOSE To study the impact of radiation quality on the spectrum of chromosome exchange aberrations in human lymphocytes using chromosome arm-specific and telomeric probes. The analysis is focused on: (1) incomplete exchanges, (2) interstitial fragments, (3) interarm intrachanges and (4) the complexity of the aberration patterns. The present data after neutron exposure are compared with previously obtained data after X-irradiation. MATERIALS AND METHODS Isolated human lymphocytes from three donors were irradiated with 1 MeV fast neutrons (0.25, 0.5, 1.0, 1.5, 2.0 Gy). Analysis was performed on first post-irradiation metaphases with arm-specific probes for chromosome 1 in combination with a pan-centromeric probe, or with telomeric and centromeric PNA probes. RESULTS In comparison with X-rays, exposure to neutrons leads to: (1) similar frequencies of incomplete exchanges or terminal deletions, (2) a significantly higher induction of both inter- and intraarm intrachanges, (3) a higher proportion of complex aberrations, and (4) aberrations with a higher degree of complexity, i.e. derived from more chromosome breaks which interact more frequently in a non-reciprocal fashion. Essentially no dose dependence was found for the yield ratios between the various types of chromosomal aberrations. CONCLUSIONS Despite the reduced rejoining deficiency of DNA double-strand breaks induced by high-LET radiation, exposure to neutrons does not lead to enhanced levels of unrejoined chromosome breaks that can be observed as incomplete exchanges in cells that have reached mitosis. Proximity effects are more pronounced after densely ionizing radiation than after sparsely ionizing radiation. Clustered damage produced by neutron tracks results in a high proportion of complex aberrations and in non-reciprocal interactions of chromosome breaks. Most of the exchanges occur within one neutron track and little interaction seems to take place between the breaks formed in different tracks.
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Affiliation(s)
- J J Boei
- MCG, Department of Radiation Genetics and Chemical Mutagenesis, Leiden University Medical Center, Wassenaarseweg 72, PO Box 9503, 2300 RA Leiden, The Netherlands.
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Noë V, Fingleton B, Jacobs K, Crawford HC, Vermeulen S, Steelant W, Bruyneel E, Matrisian LM, Mareel M. Release of an invasion promoter E-cadherin fragment by matrilysin and stromelysin-1. J Cell Sci 2001; 114:111-118. [PMID: 11112695 DOI: 10.1242/jcs.114.1.111] [Citation(s) in RCA: 437] [Impact Index Per Article: 19.0] [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: 01/12/2023] Open
Abstract
The function of many transmembrane molecules can be altered by cleavage and subsequent release of their ectodomains. We have investigated ectodomain cleavage of the cell-cell adhesion and signal-transducing molecule E-cadherin. The E-cadherin ectodomain is constitutively shed from the surface of MCF-7 and MDCKts.srcC12 cells in culture. Release of the 80 kDa soluble E-cadherin fragment is stimulated by phorbol-12-myristate-13-acetate and is inhibited by overexpression of the tissue inhibitor of metalloproteinases-2. The metalloproteinases matrilysin and stromelysin-1 both cleave E-cadherin at the cell surface and release sE-CAD into the medium. The soluble E-cadherin fragment thus released inhibits E-cadherin functions in a paracrine way, as indicated by induction of invasion into collagen type I and inhibition of E-cadherin-dependent cell aggregation. Our results, therefore, suggest a novel mechanism by which metalloproteinases can influence invasion.
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Affiliation(s)
- V Noë
- Laboratory of Experimental Cancerology, Department of Radiotherapy and Nuclear Medicine, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium
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Demetter P, De Vos M, Van Damme N, Baeten D, Elewaut D, Vermeulen S, Mareel M, Bullock G, Mielants H, Verbruggen G, De Keyser F, Veys EM, Cuvelier CA. Focal up-regulation of E-cadherin-catenin complex in inflamed bowel mucosa but reduced expression in ulcer-associated cell lineage. Am J Clin Pathol 2000; 114:364-70. [PMID: 10989636 DOI: 10.1093/ajcp/114.3.364] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [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: 11/14/2022] Open
Abstract
The E-cadherin-catenin complex is important for the maintenance of epithelial architecture. We studied its expression in Crohn disease, ulcerative colitis, acute ileitis, and controls. Immunohistochemical stainings for E-cadherin, alpha-catenin, beta-catenin and gamma-catenin were performed. E-cadherin messenger RNA (mRNA) was detected using riboprobes. In active inflammation, there was up-regulation of the complex. In particular, epithelium adjacent to ulcers showed increased expression of protein and mRNA, but in ulcer-associated cell lineage, the intensity of staining was weak to negative. In focal inflammation, up-regulation was found in affected areas. Reparative epithelium growing over denuded areas showed weaker expression. Since structural or functional perturbation in any of the molecules of the E-cadherin-catenin complex results in loss of intercellular adhesion, the preexistent epithelium may benefit from up-regulation to try to maintain its normal architecture under inflammatory conditions. Reduced expression in reparative epithelium and ulcer-associated cell lineage could facilitate the motility of these cells.
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Affiliation(s)
- P Demetter
- Department of Pathology, Ghent University Hospital, Belgium
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Vermeulen S, Young R, Li F, Meier R, Raisis J, Klein S, Kohler E. A comparison of single fraction radiosurgery tumor control and toxicity in the treatment of basal and nonbasal meningiomas. Stereotact Funct Neurosurg 2000; 72 Suppl 1:60-6. [PMID: 10681692 DOI: 10.1159/000056440] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [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: 11/19/2022]
Abstract
Between July 1993 and October 1997, 107 patients with 118 meningiomas were treated with Gamma Knife radiosurgery (GKRS). The most frequent site of tumor origin was the skull base (54%). The mean tumor diameter and volume were 2.5 cm and 9.4 cm3, respectively. The mean dose to the tumor periphery was 17 Gy, prescribed to a mean iso-dose of 47%. At a mean follow-up of 28 months, tumor control for basal and nonbasal meningiomas was 80%. Deteriorating peritumoral edema associated with symptoms was observed in 1 of 49 (2%) skull-base tumors and in 4 of 39 (10%) non-basal tumors, without associated tumor growth. (p=0.l5 and 0.234 respectively, z-test). Stereotactic radiosurgery can achieve acceptable tumor control with low morbidity in the treatment of most meningiomas. However, when the tumor is nonbasal, the potential morbidity from peritumoral edema should be recognized and other treatment options considered, such as adjuvant surgery, partial fractionated irradiation or stereotactic radiotherapy.
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Affiliation(s)
- S Vermeulen
- Swedish Hospital Tumor Institute, Seattle, WA 98104, USA
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Demetter P, Baeten D, De Keyser F, De Vos M, Van Damme N, Verbruggen G, Vermeulen S, Mareel M, Elewaut D, Mielants H, Veys EM, Cuvelier CA. Subclinical gut inflammation in spondyloarthropathy patients is associated with upregulation of the E-cadherin/catenin complex. Ann Rheum Dis 2000; 59:211-6. [PMID: 10700430 PMCID: PMC1753082 DOI: 10.1136/ard.59.3.211] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [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: 01/20/2023]
Abstract
OBJECTIVE Previously an upregulation of E-cadherin and its associated molecules alpha-catenin, beta-catenin and plakoglobin has been demonstrated in clinically overt inflammatory bowel disease (IBD). The aim of this study was to investigate the expression of the E-cadherin/catenin complex in subclinically inflamed bowel mucosa from spondyloarthropathy (SpA) patients. METHODS Ileal and colonic biopsy specimens from 19 SpA patients with subclinical inflammatory gut lesions and from seven controls were stained with monoclonal antibodies against E-cadherin, beta-catenin and plakoglobin and a polyclonal antibody against alpha-catenin. E-cadherin mRNA was detected using a riboprobe. Inflammation was histologically classified into acute, chronic active and chronic quiescent forms. RESULTS In acute and chronic active bowel inflammation of SpA patients, upregulation of the E-cadherin/catenin glycoprotein complex could be observed. Chronic lesions in a quiescent state did not show such an upregulation. Furthermore, chronic inflammation was associated with an increase in E-cadherin mRNA. CONCLUSIONS As some of the SpA patients with subclinical gut inflammation develop IBD, upregulation of the E-cadherin/catenin complex in inflamed bowel mucosa from SpA patients may point to early cellular changes in the development of IBD. However, at present it cannot be excluded that increased E-cadherin/catenin complex expression is a bystander phenomenon of active inflammation.
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Affiliation(s)
- P Demetter
- Department of Pathology, University Hospital, University of Gent, University Hospital, 6 Blok A, De Pintelaan 185, 9000 Gent, Belgium
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Abstract
PURPOSE To generate dose-response curves for X-ray-induced chromosomal aberrations analysed in human blood lymphocytes using telomeric and centromeric peptide nucleic acid (PNA) probes. MATERIALS AND METHODS Isolated human lymphocytes were X-irradiated with doses of 0, 1, 2, 3, 4 and 6 Gy. Aberrations were analysed in the first post-irradiation metaphases using telomeric and centromeric PNA probes. RESULTS Similar to the dose-response curves for the yield of dicentrics and centric rings, the dose-response curves for interstitial fragments and incomplete elements (derived from either terminal deletions or incomplete exchanges) follow a linear-quadratic function. Furthermore, it was estimated that 76% of excess acentric fragments originate from complete exchanges (interstitial deletions) and only 24% from incomplete exchanges or terminal deletions. CONCLUSIONS Interstitial fragments form a major class of radiation-induced chromosomal aberrations. They are induced about half as frequently as dicentrics over the whole dose range investigated. The comparable trend of the dose-response curve for the different aberrations, including incomplete elements, indicates that all detected aberrations are formed by a similar underlying mechanism. It also suggests that the ratio between non- or incomplete repair (leading to open ends of broken chromosomes) and incorrect repair (leading to exchange aberrations) is independent of dose.
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Affiliation(s)
- J J Boei
- MGC, Department of Radiation Genetics and Chemical Mutagenesis, Leiden University Medical Center, The Netherlands.
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Debruyne P, Vermeulen S, Mareel M. The role of the E-cadherin/catenin complex in gastrointestinal cancer. Acta Gastroenterol Belg 1999; 62:393-402. [PMID: 10692769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Cancer is a genetic disease. The unstable genome of cancer cells causes tumour progression through multiple alterations in suppressor and promoter genes, leading to loss of homeostatic and gain of oncogenic functions. Invasion is the critical step in the acquisition of malignancy. It implicates a continuous molecular conversation of the cancer cells with other cells and with the extracellular matrix in which adhesion molecules are crucial. One of these, E-cadherin, is discussed in the present review. E-cadherin is a transmembrane glycoprotein that forms a complex with cytoplasmic proteins, termed catenins because they link E-cadherin to the actin cytoskeleton. E-cadherin/catenin-mediated intercellular adhesion and communication is mainly homophylic homotypic. There is compelling evidence from experiments in vitro as well as in vivo to accept that the E-cadherin/catenin complex acts as an invasion suppressor. The mechanism of this action is not only through cell-cell adhesion but also through transduction of signals to the cell's motility system. In the replication error positive human colon cancer cell line HCT-8, the alpha E-catenin gene CTNNA1 is an invasion suppressor gene. Here, the transition from the non-invasive to the invasive state was prevented by introduction into the unstable non-invasive cells of either an extra CTNNA1 or a wild type hMSH6 mismatch repair gene. beta-catenin also participates at a complex which comprises the adenomatous polyposis cancer protein APC. In colorectal cancer, mutation of either APC or beta-catenin is oncogenic. Downregulation of the E-cadherin/catenin complex may occur in several ways amongst which are gene mutations, methylation of 5'CpG dinucleotides within the promotor region of E-cadherin, tyrosine phosphorylation of beta-catenin, cell surface expression of proteoglycans sterically hindering E-cadherin and proteolytic release of fragments from the extracellular part of E-cadherin. Upregulation of the E-cadherin/catenin complex has been realized with a series of agents, some of which can be used therapeutically. In most human gastrointestinal cancers the E-cadherin/catenin or related complexes are disturbed and this underscores their pivotal role in the progression of these tumours. Mutations of the E-cadherin gene, including germline mutations, occur in diffuse gastric carcinoma, CpG methylation around the promotor region of E-cadherin in hepatocellular carcinomas and mutations of the APC tumour suppressor gene or in the beta-catenin oncogene in most colorectal cancers. The literature agrees about the disturbance of immunohistochemical patterns of E-cadherin and catenin expression in gastrointestinal cancers. Conflicting opinions do, however, exist about the prognostic value of such immunohistochemical aberrations. We doubt that immunohistochemistry of E-cadherin or catenins add prognostic value to the already used histological grading systems. In our opinion the major benefit from understanding of the E-cadherin/catenin-mediated pathways of invasion will be the development of new anti-invasive treatment strategies.
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Affiliation(s)
- P Debruyne
- Department of Radiotherapy and Nuclear Medicine, University Hospital Gent, Belgium
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Mareel M, Vermeulen S. [The alpha-catenin gene is a suppressor gene of neoplasm invasiveness]. C R Seances Soc Biol Fil 1998; 192:231-4. [PMID: 9759366] [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: 02/08/2023]
Affiliation(s)
- M Mareel
- Laboratory of Experimental Cancerology, University Hospital, Gent, Belgium
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Vermeulen S, Young R, Posewitz A, Grimm P, Blasko J, Kohler E, Raisis J. Stereotactic radiosurgery toxicity in the treatment of intracanalicular acoustic neuromas: the Seattle Northwest gamma knife experience. Stereotact Funct Neurosurg 1998; 70 Suppl 1:80-7. [PMID: 9782239 DOI: 10.1159/000056410] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [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: 11/19/2022]
Abstract
Patients with acoustic neuromas have several treatment options. The appropriate individual treatment decision and expected control rates and risks for the individual techniques have been outlined in several texts [1-4, 6-8]. This article describes radiosurgery toxicity in those patients with acoustic neuromas who have intracanalicular disease. 52 patients with 54 acoustic neuromas were treated between September 1993 and April 1997. 14 tumors were intracanalicular lesions, with a mean diameter <1 cm and volume <1 cm3. Dose to the periphery of the intracanalicular lesion extension ranged from 12-18 Gy (mean 16 Gy). The margin isodose was 40-60% (mean 47%). 32 isocenters were used to treat the 14 intracanalicular tumors (mean 2.3 isocenters per patient). At a mean follow-up of 18 months (range 1-39 months), 12/12 or 100% of the intracanalicular lesions demonstrated regression or no change in size on subsequent imaging. The following acute side effects were observed posttreatment in intracanalicular tumors: diminished hearing 14%, facial neuropathy 43%, trigeminal neuropathy 21%, balance disorder 14%, dizziness 7%, and headache 7%. Facial and trigeminal neuropathy, balance disorder, dizziness, vertigo and headaches were more common in patients with intracanalicular tumors than those with an extracanalicular extension. Although it has been suggested that small acoustic neuromas (i.e. <1 cm3) tolerate doses of 18 Gy with acceptable toxicity, when the lesion is located in the auditory canal a lesser dose may be warranted to minimize potential side effects. For now, our center has established a protocol that limits radiosurgical stereotactic intracanalicular peripheral doses to 12 Gy until further toxicity studies have been collected and reviewed.
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Affiliation(s)
- S Vermeulen
- Northwest Gamma Knife Center, Northwest Hospital, Northwest Hospital, Seattle, Wash., USA
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