References of "Defraigne, Jean-Olivier"
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See detailPrimary graft nonfunction and Kupffer cell activation after liver transplantation from non-heart-beating donors in pigs
Monbaliu, D.; van Pelt, J.; De Vos, R. et al

in Liver Transplantation (2007), 13(2), 239-247

More extensive use of non-heart-beating donors (NHBD) could reduce mortality on liver transplantation waiting lists, but this is associated with more primary nonfunction (PNF). We assessed which ... [more ▼]

More extensive use of non-heart-beating donors (NHBD) could reduce mortality on liver transplantation waiting lists, but this is associated with more primary nonfunction (PNF). We assessed which parameters are involved in the development of PNF in livers from NHBD in a previously validated pig liver transplantation model, in which livers were transplanted after exposure to incremental periods of warm ischemia. The risk of PNF was unacceptably high (>50%) when livers were exposed to >30 minutes' warm ischemia before a short cold ischemic period. This study examined how PNF is affected by Kupffer cell activation (beta-galactosidase), the generation of cytokines tumor necrosis factor alpha and interleukin 6, antioxidant mechanisms (ascorbic acid, alpha-tocopherol, reduced glutathione), circulating redox-active iron, and sinusoidal endothelial cell function (hyaluronic acid clearance). Kupffer cells were more activated in PNF recipients, as suggested by higher beta-galactosidase levels (15 minutes after reperfusion), and secondarily, by higher production of tumor necrosis factor alpha and interleukin 6 (180 minutes after reperfusion). In addition, a-tocopherol and reduced glutathione were lower, and ascorbic acid and redox-active iron higher in PNF recipients. Finally, PNF grafts displayed progressively decreasing hyaluronic acid clearance (suggesting sinusoidal endothelial cell dysfunction) and parenchymal edema. Consequently, a reduced-flow phenomenon was documented. In grafts from NHBD that are destined to fail, beta-galactosidase activity (a surrogate of Kupffer cell activation) is higher, proinflammatory cytokines are overproduced, some antioxidant mechanisms fail, and circulating redox-active iron is more rapidly released. A no-flow phenomenon is eventually observed in these failing grafts. [less ▲]

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See detailOptimisation of extraction of phenolics and antioxidants from black currant leaves and buds and of stability during storage
Tabart, Jessica ULg; Kevers, Claire ULg; Sipel, Arnaud ULg et al

in Food Chemistry (2007), 105(3), 1268-1275

Health benefits of a diet rich in fruits and vegetables are attributed in part to their contents of phenolics and other antioxidant compounds. In this research, the extraction of phenolics and antioxidant ... [more ▼]

Health benefits of a diet rich in fruits and vegetables are attributed in part to their contents of phenolics and other antioxidant compounds. In this research, the extraction of phenolics and antioxidant compounds from black currant was optimised for different plant organs. The extraction solvent affected yield: aqueous acetone was better than methanol and acetate or glycine buffer. In aqueous buffer, maximum yields of total phenolics and antioxidant activities were obtained at pH 3. Extraction from lyophilised materials yielded extracts with higher phenolic contents and antioxidant activities. Stability of extracts made with acetate or glycine buffer was limited while the use of a mixture of acetone/acetic acid/water for extraction allowed a high phenolic content and antioxidant capacity in dry extract to be maintained for several months. This type of extract could be incorporated in functional food, beverage or dietary supplement. (c) 2007 Elsevier Ltd. All rights reserved. [less ▲]

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See detailDevelopment of atherosclerosis for the vascular surgeon.
Defraigne, Jean-Olivier ULg

in Liapis, C. D. (Ed.) European Manual of Medicine (2007)

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See detailA thromboxane receptor antagonist, reduces development of atherosclerosis in apoE-deficient mice.
Cherdon, Céline ULg; Rolin, S.; Hanson, S. et al

in Journal of Molecular and Cellular Cardiology (2007), 42

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See detailBM-573, a thromboxane receptor antagonist, reduces development of atherosclerosis in apoE–deficient mice
Cherdon, Céline ULg; Rolin, Stéphanie; Hanson, Julien ULg et al

in Journal of Molecular and Cellular Cardiology (2007), 42(suppl 1.), 33-34

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See detailChange in blood antioxidant status of horses moved from a stable following diagnosis of equine motor neuron disease
Delguste, Catherine ULg; de Moffarts, B.; Kirschvink, N. et al

in Canadian Veterinary Journal = Revue Vétérinaire Canadienne (2007), 48(11), 1165-1167

The antioxidant status of 10 horses living in stable 1 where 2 cases of equine motor neuron disease had previously been diagnosed was assessed before and 9 weeks after moving to another stable. Duration ... [more ▼]

The antioxidant status of 10 horses living in stable 1 where 2 cases of equine motor neuron disease had previously been diagnosed was assessed before and 9 weeks after moving to another stable. Duration of residence in stable 1, subsequent moving, or both, significantly affected several parameters of the antioxidant status. [less ▲]

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See detailPrevalence of cardiovascular risk factors in young adults studying for their first year at the University of Liège
Krzesinski, Jean-Marie ULg; Graceffa, Maria Antonietta ULg; Focan, Michèle ULg et al

in Acta Clinica Belgica (2007), 62(5), 384

The prevalence of cardiovascular risk factors (RF) is not well known in young students. The present study would like to partially fill this gap with the idea to propose an educational program for ... [more ▼]

The prevalence of cardiovascular risk factors (RF) is not well known in young students. The present study would like to partially fill this gap with the idea to propose an educational program for improvement of these risk factors by diet and lifestyle modifications in the near future during the following years of their studies. [less ▲]

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See detailAntioxidant capacity of black currant varies with organ, season, and cultivar
Tabart, Jessica; Kevers, Claire ULg; Pincemail, Joël ULg et al

in Journal of Agricultural and Food Chemistry (2006), 54(17), 6271-6276

Small berries such as black currant constitute one of the important sources of potential health-promoting phytochemicals because these fruits are rich sources of compounds with high antioxidant properties ... [more ▼]

Small berries such as black currant constitute one of the important sources of potential health-promoting phytochemicals because these fruits are rich sources of compounds with high antioxidant properties. In this work, antioxidant capacities of different parts (buds, leaves, fruits) of various black currant cultivars were compared throughout the growing season with the aim to prepare extracts with high antioxidant capacity. Buds (opened, at the end of March) and leaves (in June) had a higher content in phenolics and antioxidants than fully ripened berries (in July) and the best yield (per branch) was obtained with the leaves collected in June due to their higher biomass. The differences observed among the eight cultivars tested were small. Concerning flavonols, quercetin was dominant in all organs and cultivars, myricetin varied widely among the cultivars, and kampferol was very low. [less ▲]

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See detailThe use of an apoE–deficient (apoE-/-) mice model to characterize the therapeutic benefits of original thromboxane modulators
Cherdon, Céline ULg; Rolin, stephanie; Hanson, Julien ULg et al

Poster (2006, May 17)

The aim of our study was to use an apoE–deficient mouse model to test drugs acting as thromboxane A2 antagonist. Presented here is the “en face” method 6 which allows the evaluation of atherosclerosis ... [more ▼]

The aim of our study was to use an apoE–deficient mouse model to test drugs acting as thromboxane A2 antagonist. Presented here is the “en face” method 6 which allows the evaluation of atherosclerosis lesions development in wild type and APO E-/- mice. This method involves pinning out the aorta and quantifying lesion area as a percentage of total surface area. The use of this mice model offers a unique opportunity to characterize the therapeutic benefits of pharmacologicals agents designed in our laboratory of which antioxidants and thromboxane modulators. The pharmacological characterization of BM-573 as potential antiatherosclerotic agent will also be discussed [less ▲]

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See detailComparison of inflammatory responses after off-pump and on-pump coronary surgery using surface modifying additives circuit
Quaniers, Janine ULg; Leruth, Julie ULg; Albert, Adelin ULg et al

in Annals of Thoracic Surgery (2006), 81(5), 1683-1690

Background. Cardiac surgery is followed by various degrees of inflammation, which have harmful consequences. Because of the central role of extracorporeal circulation ( EC), off- pump coronary bypass ... [more ▼]

Background. Cardiac surgery is followed by various degrees of inflammation, which have harmful consequences. Because of the central role of extracorporeal circulation ( EC), off- pump coronary bypass surgery is deemed preferable. Do different modalities of EC challenge this view? Methods. Four groups of similar patients underwent coronary surgery: ( group 1) on- pump, EC with closed surface modifying additives ( SMA) circuit and no pump suckers ( n = 20); ( group 2) on- pump, EC with open SMA circuit and pump suckers ( n = 20); ( group 3) off- pump ( beating heart) and heparin 3 mg/ kg ( n = 20); ( group 4) off- pump ( beating heart) and heparin 1 mg/ kg ( n = 20). Interleukins ( IL)- 6, IL- 8, IL- 10, myeloperoxidase, elastase, and terminal complex of the complement ( TCC) were analyzed at various times: at induction ( time I); after heparin ( time II); after complete revascularization ( time III); after protamine ( time IV); and 24 hours later ( time V). Results. The TCC was significantly higher in groups 1 and 2 at time III. The pattern of IL- 6 was the same for the four groups. No significant difference in myeloperoxydase content was noted; however, elastase was significantly higher in the two EC ( on- pump) groups. Conclusions. Except for the complement system and elastase, on- pump surgery with SMA- coated circuits did not elicit any greater inflammatory response than off-pump surgery. [less ▲]

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See detailCreatinine-based formulae for the estimation of glomerular filtration rate in heart transplant recipients
Delanaye, Pierre ULg; Nellessen, Eric ULg; Grosch, Stéphanie ULg et al

in Clinical Transplantation (2006), 20(5, Sep-Oct), 596-603

Chronic renal failure (CRF) is a common complication in heart transplant patients. Serum creatinine has clear limitations for the detection and estimation of glomerular filtration rate (GFR). Various ... [more ▼]

Chronic renal failure (CRF) is a common complication in heart transplant patients. Serum creatinine has clear limitations for the detection and estimation of glomerular filtration rate (GFR). Various creatinine-based formulae are classically used for GFR estimation, but little scientific evidence exists for such use in a heart transplant population. GFR was measured using the plasmatic clearance of the glomerular tracer Cr-51-EDTA in 27 heart transplant patients with two measures for 22 of the patients. Forty-nine measures were thus available for analysis. The precision and accuracy (Bland and Altman analysis) of the Cockcroft, simplified Modified Diet in Renal Diseases (MDRD) and new Mayo Clinic formulae were compared. The mean GFR of the population was 39 +/- 15 mL/min/1.73 m(2). All formulae were well correlated with the GFR. With the Bland and Altman analysis, the accuracy of the MDRD formula appeared higher than that of the Cockcroft or the Mayo Clinic formulae (bias of +12 mL/min/1.73 m(2), vs. +19.9 mL/min/1.73 m(2), and +22.1 mL/min/1.73 m(2), respectively). The difference between the estimated and measured GFR was higher than 20 mL/min/1.73 m(2) in 51% and 55% cases when using the Cockcroft and the Mayo Clinic formulae respectively, whereas the difference was only noted in 14% cases when the MDRD was used. Among creatinine-based formulae, the MDRD appears the most precise and accurate for estimating the GFR in heart transplant patients. However, when the GFR must be measured with high accuracy, we recommend the use of a reference method like inulin or Cr-51-EDTA plasma clearance techniques. [less ▲]

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See detailDistribution of F-18 fluorodeoxyglucose (F-18 FDG) in abdominal aortic aneurysm: High accumulation in macrophages seen on PET Imaging and immunohistology
Defawe, O. D.; Hustinx, Roland ULg; Defraigne, Jean-Olivier ULg et al

in Clinical Nuclear Medicine (2005), 30(5), 340-341

A 68-year-old man was hospitalized for unstable angina and underwent emergency coronary artery bypass surgery. During the operation, a pulsatile large abdominal aortic aneurysm (AAA) was discovered. To ... [more ▼]

A 68-year-old man was hospitalized for unstable angina and underwent emergency coronary artery bypass surgery. During the operation, a pulsatile large abdominal aortic aneurysm (AAA) was discovered. To define the optimal treatment of the abdominal aneurysm, after bypass surgery, CT scans and positron emission tomography (PET) were performed, as we routinely do. PET imaging combined with immunohistologic examination showed a region of increased F-18 FDG uptake corresponding to an inflammatory infiltrate in the aortic wall in contrast to the thrombus in the aneurysm (devoid of inflammatory cells). The luminal area showed midlevel F-18 FDG uptake corresponding to circulating mediators. [less ▲]

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See detailUn mecanisme physiopathologique central a l'origine des complications du diabete?
Defraigne, Jean-Olivier ULg

in Revue Médicale de Liège (2005), 60(5-6, May-Jun), 472-8

Diabetes mellitus is associated to micro- and macro-vascular lesions responsible for myocardial infarction, nephropathy, retinopathy and polyneuropathy. Four main pathogenic mechanisms have been proposed ... [more ▼]

Diabetes mellitus is associated to micro- and macro-vascular lesions responsible for myocardial infarction, nephropathy, retinopathy and polyneuropathy. Four main pathogenic mechanisms have been proposed, all associated with hyperglycaemia: 1) increased flux in the polyol pathway; 2) increased flux in the hexosamine pathway; 3) protein kinase C activation; and 4) increased formation of advanced glycation endproducts. A common mechanism seems to play a central role in the activation of these various pathways. Indeed, an increased production of free radicals by mitochondria induced by hyperglycaemia may be responsible for the observed metabolic disturbances. The present article describes that theory and presents its possible therapeutic implications. [less ▲]

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See detailOxidative stress in the liver and the brain of rats in fulminant hepatic failure
Detry, Olivier ULg; Gaspar, Yves; Cheramy-Bien, Jean-Paul ULg et al

in Transplantation Proceedings (2005), 37(6, Jul-Aug), 2883-2885

The etiological mechanisms of brain edema in fulminant hepatic failure are incompletely understood. In a surgical model of fulminant hepatic failure in the rat, we tested whether oxidative stress may be ... [more ▼]

The etiological mechanisms of brain edema in fulminant hepatic failure are incompletely understood. In a surgical model of fulminant hepatic failure in the rat, we tested whether oxidative stress may be involved in the early steps of brain edema. Moreover, we took advantage of this model to determine if oxidative stress may be involved in the hepatocyte dysfunction observed in the setting of fulminant hepatic failure. Oxidative stress was evaluated by measurement of tissue ascorbic acid in the brain and liver of rats at 6 hours after induction of fulminant hepatic failure versus in control or partially hepatectomized rats. After 6 hours, the level of ascorbic acid was not different in the brain tissue of the various groups, indicating no oxidative stress. The liver showed a significant decrease in ascorbic acid levels, both in ischemic and nonischemic liver tissue, suggesting that oxidative stress might be involved in the failure of liver regeneration in fulminant hepatic failure. In this rat model no oxidative stress was demonstrated in the brain during the early phase of fulminant liver failure. [less ▲]

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See detailEffet de l’entraînement et de l’intensité de l’exercice sur les marqueurs sanguins du stress oxydant chez le trotteur
De Moffarts, Brieuc; Kirschvink, Nathalie; Art, Tatiana ULg et al

in Proceedings: Congrès de l'Association Vétérinaire Equine Française (AVEF) (2004)

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See detailImpact of training and exercise intensity on blood antioxidant markers in healthy Standardbred horses
De Moffarts, Brieuc; Kirschvink, Nathalie; Art, Tatiana ULg et al

in Equine & Comparative Exercise Physiology (2004), 1(3), 211-220

This study investigated the effect of training and exercise intensity on blood antioxidant markers in six healthy Standardbred horses. Markers studied were uric acid (UA), ascorbic acid (AA), α-tocopherol ... [more ▼]

This study investigated the effect of training and exercise intensity on blood antioxidant markers in six healthy Standardbred horses. Markers studied were uric acid (UA), ascorbic acid (AA), α-tocopherol, vitamin A (Vit A), superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione – reduced (GSH) and oxidized (GSSG), glutathione redox ratio (GRR), copper (Cu), zinc (Zn) and selenium (Se). The horses performed a standardized exercise test (SET) when they were untrained (T0), after 4 weeks of light training (T4) and after 8 weeks of interval training (T12). Forty-eight hours after SET T4 and SET T12, a SET with run up to fatigue (TTF4 and TTF12) was performed. Maximal oxygen consumption (V˙O2max) was determined within 3–5 days after TTF4 and TTF12. At each test (SET T(i) and TTF(i)), venous blood was sampled at rest (R), peak-exercise (Emax), 15 (E15) and 60 (E60) min after the test. UA, AA and GRR were increased significantly by the exercise, whereas GSH and Vit A were decreased significantly (P<0.05). Training-related increases (T0 vs. T4 vs. T12) were observed for UA, SOD, GPx and Se, whereas GSH, α-tocopherol and Zn decreased (P<0.05). Exercise intensity (TTF(i) vs. T(i)) increased UA and AA significantly and decreased GSH significantly (P<0.05). A significant correlation between ΔSOD and ΔV˙O2max (r=0.86, p<0.05) determined at SET T4 and SET T12 was found. Taken together, these results indicate that training and exercise intensity significantly influence blood antioxidant markers in healthy Standardbred horses [less ▲]

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See detailMalignant solitary fibrous tumor of the pleura: report of a case with cytogenetic analysis
Defraigne, Jean-Olivier ULg; Hermans, Gilberte ULg; Dome, Florence ULg et al

in Virchows Archiv (2003), 442(4), 388-392

The majority of solitary fibrous tumors (SFTs) of the pleura are benign, but 10-30% locally recur or metastasize. Pathogenic factors relevant to the determinism of their biological properties are largely ... [more ▼]

The majority of solitary fibrous tumors (SFTs) of the pleura are benign, but 10-30% locally recur or metastasize. Pathogenic factors relevant to the determinism of their biological properties are largely unknown. Cytogenetic data on SFTs of the pleura are sparse. We report herein a case of a malignant SFT of the pleura where successful karyotyping was obtained from the primary and recurrent tumors. The initial karyotype showed two abnormal clones: 48, XY; +8; +8; del(9)(q22; q32) [19] and 46, XY, t(1; 16)(q25;p 12) [7]. Culture of the recurrent tumor yielded one clone identical to the dominant clone of the initial karyotype. Demonstration of a recurrent abnormal karyotype largely supports its relevance to the malignant clone and suggests a role of supernumerary chromosome(s) 8 in the determinism of malignant behavior in SFT. [less ▲]

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See detailHistory of solid organ transplantation at the University of Liege
Lejeune, Georges ULg; Limet, Raymond ULg; Meurisse, Michel ULg et al

in Acta Chirurgica Belgica (2003), 103(3 Sp. Iss. SI), 32-36

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