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Document Server@UHasselt (59.068 recursos)

Repository of the University of Hasselt containing publications in the fields of statistics, computer science, information strategies and material from the Institute for behavioural sciences.

Research Institutes - Biomedical Research Institute (BIOMED)

Mostrando recursos 1 - 20 de 1.554

  1. Expression Pattern of Basal Markers in Human Dental Pulp Stem Cells and Tissue

    MARTENS, Wendy; WOLFS, Esther; STRUYS, Tom; POLITIS, Constantinus; BRONCKAERS, Annelies; LAMBRICHTS, Ivo
    Dental pulp stem cells (DPSC) have been characterized as a multipotent stem cell population, with the ability to differentiate into mesodermal and neural cell lineages. Although 'de novo' expression of neural markers after differentiation is mostly considered as proof of differentiation, expression of these markers in undifferentiated DPSC is not well described. Therefore, an immunocytochemical analysis was performed to evaluate the neural marker expression of undifferentiated human DPSC (hDPSC) in in vitro cultures. Undifferentiated hDPSC uniformly expressed neural markers beta-III-tubulin, S100 protein and synaptophysin. A subset of the population showed a positive immune-reactivity for galactocerebroside, neurofilament and nerve growth factor...

  2. Comorbidity Significantly Affects Clinical Outcome After Cardiac Resynchronization Therapy Regardless of Ventricular Remodeling

    VERBRUGGE, Frederik; Dupont, Matthias; Rivero-Ayerza, Maximo; De Vusser, Philippe; Van Herendael, Hugo; Vercammen, Jan; Jacobs, Linda; Verhaert, David; VANDERVOORT, Pieter; Tang, W. H. Wilson; MULLENS, Wilfried
    Background: The influence of comorbid conditions on ventricular remodeling, functional status, and clinical outcome after cardiac resynchronization therapy (CRT) is insufficiently elucidated. Methods and Results: The influence of different comorbid conditions on left ventricular remodeling, improvement in New York Heart Association (NYHA) functional class, hospitalizations for heart failure, and all-cause mortality after CRT implantation was analyzed in 172 consecutive patients (mean age 71 +/- 9 y), implanted from October 2008 to April 2011 in a single tertiary care hospital. During mean follow-up of 18 +/- 9 months, 21 patients died and 57 were admitted for heart failure. Left ventricular remodeling...

  3. The influence of finger position on percussion sounds

    van Zwieten, Koos Jaap; Potekhin, V.
    Percussion sounds of the chest are resonant sounds induced by striking one finger upon another finger applied firmly to the chest. They have the greatest content of energy in the range of 150 - 200 Hz. The stability of the arch of the striking finger contributes to its rigidity, thus influencing the quality of percussion sounds produced.

  4. Molecular engineering of chromophores for combined second-harmonic and two-photon fluorescence in cellular imaging

    De Meulenaere, Evelien; Chen, Wei-Qiang; Van Cleuvenbergen, Stijn; Zheng, Mei-Ling; Psilodimitrakopoulos, Sotiris; Paesen, Rik; Taymans, Jean-Marc; Ameloot, Marcel; Vanderleyden, Jos; Loza-Alvarez, Pablo; Duan, Xuan-Ming; Clays, Koen
    A series of chromophores with enhanced second-and third-order nonlinear optical properties were engineered for use in combined second-harmonic and two-photon fluorescence microscopy. Electronaccepting moieties imparted nonlinear optical properties to the chromophores. The electron-rich carbazole core served as a template towards one-or two-dimensional chromophores. More efficient acceptor groups (pyridinium, benzazolium, benzothiazolium) on the carbazole donor core resulted in improved second-and third-order nonlinear optical properties. A selection of these chromophores was tested in a cellular environment with a multimodal multiphoton microscope. The structural differences of the chromophores resulted in high selectivity for mitochondria or the nucleus in two-photon fluorescence and ranging from...

  5. Long-lasting enhancement of GABA(A) receptor expression in newborn dentate granule cells after early-life febrile seizures

    Swijsen, Ann; Brône, Bert; Rigo, Jean-Michel; Hoogland, Govert
    Febrile seizures (FS) are the most common type of seizures in childhood and are suggested to play a role in the development of temporal lobe epilepsy (TLE). Animal studies demonstrated that experimental FS induce a long-lasting change in hippocampal excitability, resulting in enhanced seizure susceptibility. Hippocampal neurogenesis and altered ion channel expression have both been proposed as mechanisms underlying this decreased seizure threshold. The present study aimed to analyze whether dentate gyrus (DG) cells that were born after FS and matured for 8 weeks display an altered repertoire of ligand-gated ion channels. To this end, we applied an established model,...

  6. Genome-Wide Association Study On the Severity of Joint Destruction in Autoantibody Positive Rheumatoid Arthritis Identifies a Role for Sperm Associated Antigen 16

    Knevel, Rachel; Klein, Kerstin; Somers, Klaartje; Ospelt, Caroline; Houwing-Duistermaat, Jeanine J.; van Nies, Jessica; de Rooy, Diederik P. C.; de Bock, Laura; Schonkeren, Joris; Stoeken-Rijsbergen, Gerrie; Kiridly, Jenna; Rodriguez-Rodriguez, Luis; Helmer, Quinta; Sinissen, Piet; Huizinga, Tom W. J.; Toes, Rene E. M.; Gay, Steffen; Gregersen, Peter K.; Somers, Veerle; van der Helm-van Mil, Annette H. M.
    Background/Purpose: Recent genome-wide association studies (GWAs) have identified > 30 SNPs predisposing to Rheumatoid Arthritis(RA). These variants are helpful in unraveling the pathogenesis of RA. However, most therapeutic strategies target pathways of disease progression. Genetic factors account for a considerable proportion of variance in joint damage, but thus far only a few replicated severity factors are known and no GWAS has been performed. We aimed to increase the understanding of the processes underlying the inter-individual differences in joint damage in anti-citrullinated peptide anti-bodies (ACPA)-positive RA by performing a 3-staged GWAS on joint damage progression using high-quality radiology data, followed by...

  7. No additional reduction of mortality or heart failure events with intrathoracic impedance measurements in a context of telemonitoring with structural biofeedback

    GRIETEN, Lars; VERBRUGGE, Frederik; STORMS, Valerie; Verhaert, D.; Rivero-Ayerza, M.; De Vusser, P.; Van Herendael, H.; Vercammen, J.; Jacobs, L.; Rondelez, K.; MULLENS, Wilfried; VANDERVOORT, Pieter
    Our aim was to test if intra-thoracic impedance (ITI) measurements would improve short-term clinical outcome (i.e. all-cause mortality and heart failure hospitalizations) in patients with cardiac resynchronization therapy (CRT) who were followed in a telemonitoring program with structural biofeedback. Methods: CRT patients (n=200; age= 70 +/-14y) were included in a telemonitoring program at Ziekenhuis Oost-Limburg Genk, which comprised daily transmissions through a wireless system installed at their homes. All patients were followed for potential lead/device problems, episodes of anti-tachycardia pacing, device shocks, occurrence of arrhytmias, a decline in biventricular pacing percentage and/or a sudden drop in physical activity. Patients with...

  8. Novel cerebrospinal fluid and serum autoantibody targets for clinically isolated syndrome

    ROUWETTE, Myrthe; SOMERS, Klaartje; GOVARTS, Cindy; De Deyn, Peter P.; Hupperts, Raymond; VAN WIJMEERSCH, Bart; De Jong, Brigit A.; Verbeek, Marcel M.; Van Pesch, Vincent; Sindic, Christian; Villar, Luisa M.; Alvarez-Cermeno, Jose C.; STINISSEN, Piet; SOMERS, Veerle
    Limited information is available on the identity of antigens targeted by antibodies present in cerebrospinal fluid (CSF) of patients with clinically isolated syndrome (CIS). The aim of this study was to identify novel antigens for CIS and investigate their prognostic potential to predict conversion to multiple sclerosis (MS). We applied serological antigen selection (SAS) to identify antigens interacting with antibodies present in the pooled CSF from four CIS patients, who developed MS. Antibody reactivity towards CIS antigens identified by SAS was tested in CSF and serum from patients with CIS (n = 123/n = 108), MS (n = 65/n =...

  9. Ensemble and single particle fluorimetric techniques in concerted action to study the diffusion and aggregation of the glycine receptor alpha 3 isoforms in the cell plasma membrane

    NOTELAERS, Kristof; SMISDOM, Nick; Rocha, Susana; JANSSEN, Daniel; Meier, Jochen C.; RIGO, Jean-Michel; Hofkens, Johan; AMELOOT, Marcel
    The spatio-temporal membrane behavior of glycine receptors (GlyRs) is known to be of influence on receptor homeostasis and functionality. In this work, an elaborate fluorimetric strategy was applied to study the GlyR alpha 3K and L isoforms. Previously established differential clustering, desensitization and synaptic localization of these isoforms imply that membrane behavior is crucial in determining GlyR alpha 3 physiology. Therefore diffusion and aggregation of homomeric alpha 3 isoform-containing GlyRs were studied in HEK 293 cells. A unique combination of multiple diffraction-limited ensemble average methods and subdiffraction single particle techniques was used in order to achieve an integrated view of...

  10. Exercise therapy in adult individuals with obesity

    This book provides up-to-date evidence-based information on why and how to implement exercise intervention in the treatment of obesity. It starts with a description of the epidemiology of obesity, how to execute preparticipation screening in the obese, and the impact of of caloric intake restriction vs exercise training in obese subjects. Next, a detailed description of exercise physiology in obesity is provided, followed by motivation techniques, the impact of training modalities on adipose tissue mass loss, and an exploration of factors related to the heterogeneity of adipose tissue mass loss in the obese when following exercise interventions. In final, the...

  11. Travel behaviour in persons with Multiple Sclerosis using travel diaries and GPS tracking technologies

    Neven, An; Janssens, Davy; Alders, Geert; Wets, Geert; Van Wijmeersch, Bart; Feys, Peter
    Background: Persons with Multiple Sclerosis (MS) experience several physical and cognitive problems which can influence their travel behavior. Few data are available about the real participation (restrictions) in daily outdoor activity and travel behaviour. Objective: This pilot study aimed to document, in relation to disease-related disability, which, and how many, activities and trips were daily made by persons with MS, and what transport modes were used. Methods: 36 persons with MS (Expanded Disability Status Scale, EDSS, 1.5-8.0, age 27-63) and 24 healthy controls (age 25-62) were studied, using activity-related travel diaries and GPS tracking devices. Information about overall disability characteristics...

  12. The effect of histamine, a traumatic brain injury mediator, on the function of aquaporin-4 in rat brain in vivo

    Smets, A.; Nuydens, R.; De Jongh, R.; Pintelon, I.; Thys, S.; Timmermans, J. P.; Rigo, J. M.; Meert, T.
    The high levels of histamine in brain after traumatic brain injury and the observed influence of histamine on aquaporin-1 (AQP-1) localization in gastric cells, lead to the hypothesis that histamine could play a major role in the pathophysiology of brain edema An intracerebroventricular (ICV) histamine induced brain edema model was developed in rats. Infusion of concentrations >= 50 mM histamine resulted in a dose-dependent intracranial pressure (ICP) increase and death. Furthermore, histological experiments showed the internalization of membrane-expressed AQP4 after histamine challenge. The decreased fraction of functional membrane-associated AQP4 might result in an increased intracranial p[ressure. In this new experimental...

  13. The European Ankylosing Spondylitis Infliximab Cohort (EASIC): a European multicentre study of long-term outcomes in patients with ankylosing spondylitis treated with infliximab

    Heldmann, F.; Brandt, J.; van der Horst-Bruinsma, I. E.; Landewe, R.; Sieper, J.; Burmester, G. R.; van den Bosch, F.; de Vlam, K.; GEUSENS, Piet; Gaston, H.; Schewe, S.; Appelboom, T.; Emery, P.; Dougados, M.; Leirisalo-Repo, M.; Breban, M.; Listing, J.; Braun, J.
    Objectives To study the long-term efficacy and safety of treatment with infliximab in patients with ankylosing spondylitis (AS) in a real life setting. Methods AS patients from 6 European countries who had finished the 2-year trial ASSERT were invited to participate in the open-label investigator-driven study EASIC. At baseline, 2 groups were formed: patients of group 1 had not been treated with infliximab after ASSERT, while those of group 2 had continuously received it. Patients of group I were further subdivided in group I a: patients with a relapse and 1b: in remission. All patients of group la and 2...

  14. Myelin-phagocytosing macrophages modulate autoreactive T cell proliferation

    Bogie, Jeroen F. J.; STINISSEN, Piet; HELLINGS, Niels; HENDRIKS, Jerome
    Introduction: Multiple sclerosis (MS) is a chronic, inflammatory, demyelinating disease of the central nervous system (CNS) in which macrophages play a central role. Initially, macrophages where thought to be merely detrimental in MS, however, recent evidence suggests that their functional phenotype is altered following myelin phagocytosis. Macrophages that have phagocytosed myelin may be less inflammatory and may exert beneficial effects. The presence of myelin-containing macrophages in CNS-draining lymph nodes and perivascular spaces of MS patients suggests that these cells are ideally positioned to exert an immune regulatory role. Therefore we evaluated in this study the effect of myelin-phagocytosing macrophages on...

  15. Active H(1)-receptors protect against the harmful effects of H(2)-receptors in a histamine induced brain edema model

    DE JONGH, Rafael; SMETS, Anke; Nuydens, R.; RIGO, Jean-Michel; MEERT, Theo
    Inspired by the high histamine levels in the brains of traumatic brain injury (TBI) patients and earlier in vitro results with histamine in a cell swelling model, a histamine induced brain ederna model was developed in rats. In this new experimental model, selective histamine agonists and antagonists were tested. An acute lethal effect is caused by H(1)-antagunism after intracerebroventricular (ICV) histamine infusion. Moreover H(2)-receptor activation results in toxic effects, which are reduced with H1-receptor stimulation. These data indicate that active H(1)-receptors protect against the toxic II,-effect. This shielding effect of H(1)-receptor activity is confirmed in several experiments. Therefore central penetrating...

  16. Small-animal PET imaging of the type 1 and type 2 cannabinoid receptors in a photothrombotic stroke model

    Vandeputte, Caroline; Casteels, Cindy; Struys, Tom; Koole, Michel; van Veghel, Daisy; Evens, Nele; Gerits, Anneleen; Dresselaers, Tom; Lambrichts, Ivo; Himmelreich, Uwe; Bormans, Guy; Van Laere, Koen
    Recent ex vivo and pharmacological evidence suggests involvement of the endocannabinoid system in the pathophysiology of stroke, but conflicting roles for type 1 and 2 cannabinoid receptors (CB1 and CB2) have been suggested. The purpose of this study was to evaluate CB1 and CB2 receptor binding over time in vivo in a rat photothrombotic stroke model using PET. CB1 and CB2 microPET imaging was performed at regular time-points up to 2 weeks after stroke using [F-18]MK-9470 and [C-11]NE40. Stroke size was measured using MRI at 9.4 T. Ex vivo validation was performed via immunostaining for CB1 and CB2. Immunofluorescent double...

  17. Interleukin-6 class cytokines regulate the development of inflammatory CNS lesions

    Hellings, Niels; Janssens, Kris; Hendriks, Jerome; de Vries, H.; Vanwijmeersch, B.; Op't Eijnde, Bert; Van den Haute, C.; Baekelandt, Veerle; Stinissen, Piet; Slaets, H.
    Purpose/Objective: The interleukin-6 class cytokines leukemia inhibitory factor (LIF) and oncostatin M (OSM) are upregulated in multiple sclerosis (MS) lesions, but their effects on CNS lesion development are far from understood. LIF and OSM potentially influence immune responses as well as CNS resident cells during neuroinflammatory conditions. Importantly, since they activate different receptors, LIF and OSM can influence these parameters to different extents. This study was designed to elucidate the role of OSM and LIF in MS lesion development. Materials and methods: Stereotactic application of lentiviral vectors was performed to achieve a stable expression and secretion of LIF or OSM in the CNS of adult mice. Experimental autoimmune encephalomyelitis (EAE) was induced...

  18. A systematic review of 3D scapular kinematics and muscle activity during elevation in stroke subjects and controls

    De Baets, Liesbet; Jaspers, Ellen; Desloovere, Kaat; Van Deun, Sara
    Through the onset of post-stroke motor disorders, the normal scapular function is compromised. As a result, shoulder pain and associated upper limb dysfunctions frequently arise after stroke. This review aimed to provide a systematic overview of available literature on scapular function, i.e. scapular three-dimensional (3D) kinematics and muscle activity during elevation, in healthy persons, persons with primary shoulder disorders and post-stroke patients. 3D scapular kinematics have been widely reported in healthy persons and persons with primary shoulder disorders, whereby a general pattern of upward rotation and posterior tilt during elevation has been agreed upon. Results on scapular internal/external rotation are inconsistent. In a post-stroke population, 3D scapular...

  19. Interleukin-15 amplifies the pathogenic activity of CD4(+) CD28-T cells in multiple sclerosis patients

    Purpose/Objective: Immune ageing or immunosenescence, contributes to the increased morbidity and mortality seen in the elderly. Premature immunosenescence is shown to occur in patients with multiple sclerosis(MS). The main characteristic of immunosenescence is the expansion of CD4+ CD28- T cells in the peripheral blood. We showed that these cells accumulate in brain lesions of MS patients CD24+ CD28- T cells have a cytotoxic profile, shown by expression of the cytotoxic molecules perforin, granzyme B and NKG2D, an activating natural killer (NK) cell receptor. For NK cells, it is known that NKG2D expression and cytotoxicity increase in response to interleukin (IL)-15,...

  20. Resveratrol-Induced Changes of the Human Adipocyte Secretion Profile

    Rosenow, Anja; NOBEN, Jean-Paul; Jocken, Johan; Kallendrusch, Sonja; Fischer-Posovszky, Pamela; Mariman, Edwin C. M.; Renes, Johan
    Enlarged white adipose tissue (WAT) is a feature of obesity and leads to changes in its paracrine and endocrine function. Dysfunction of WAT cells is associated with obesity-associated disorders like type 2 diabetes and cardiovascular diseases. Resveratrol (RSV), a natural polyphenolic compound, mimics beneficial effects of calorie restriction. As such, RSV seems a promising therapeutic target for obesity-associated disorders. The effect of RSV on the human adipokine profile is still elusive. Therefore, a proteomic study together with bioinformatical analysis was performed to investigate the effect of RSV on the secretion profile of mature human SGBS adipocytes. RSV incubation resulted in...

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