Effets d’un apport accru en fruits et légumes sur 9 marqueurs de la peroxydation lipidique chez des sujets diabétiques de type 2
PAQUOT, Nicolas ; PINCEMAIL, Joël ; et al
in Diabète & Métabolisme (2011, March), 37Detailed reference viewed: 10 (0 ULg)
Consequences of Pneumoperitoneum on Liver Ischemia During Laparoscopic Portal Triad Clamping in a Swine Model.
; Gilson, Nathalie ; et al
in Journal of Surgical Research (2011), 166(1), 35-43
BACKGROUND: Portal triad clamping (PTC) may be required during laparoscopic liver resection to limit blood loss. The aim of this study was to test in a swine model the hypothesis that during laparoscopic ... [more ▼]
BACKGROUND: Portal triad clamping (PTC) may be required during laparoscopic liver resection to limit blood loss. The aim of this study was to test in a swine model the hypothesis that during laparoscopic PTC, increased intraperitoneal pressure may alter hepatic vein reverse circulation, inducing a more severe hepatic ischemia compared with PTC performed in laparotomy. METHODS: Fifteen pigs were randomized into three groups: laparoscopy (1 h of pneumoperitoneum at 15 mmHg and 3 h of surveillance), open PTC (1 h PTC through laparotomy and 3 h of reperfusion), and laparoscopic PTC (1 h PTC with 15 mmHg pneumoperitoneum and 3 h of reperfusion). PTC was performed under mesenteric decompression using a veno-venous splenofemoral bypass. Hepatic partial oxygen tension and microcirculatory flow were continuously measured using a Clarke-type electrode and a laser Doppler flow probe, respectively. Liver consequences of PTC was assessed by right atrium serum determination of transaminases, creatinine, bilirubin, INR, and several ischemia/reperfusion parameters, drawn before PTC (T0), before unclamping (T60), and 1 (T120) and 3 h after reperfusion (T240). Histology was performed on T240 liver biopsies. RESULTS: Compared with open PTC, laparoscopic PTC produced a more rapid and more severe decrease in hepatic oxygen tension, indicating a more severe tissular hypoxia, and a more severe decrease in hepatic microcirculatory flow, indicating a decrease in hepatic backflow. At T240, the laparoscopic PTC livers suffered from a higher degree of hepatocellular damage, shown by higher transaminases and increased necrotic index at pathology. CONCLUSIONS: These results indicate that in this pig model, laparoscopic PTC induces a more severe liver ischemia, related to decreased hepatic oxygen content and decreased hepatic backflow. If confirmed by clinical studies, these results may indicate that caution is necessary when performing prolonged PTC during laparoscopic hepatic resection, particularly in cirrhotic or steatotic livers. [less ▲]Detailed reference viewed: 36 (11 ULg)
Lifestyle Behaviours and Plasma Vitamin C and β-Carotene Levels from ELAN Population (Liège, Belgium)
PINCEMAIL, Joël ; Vanbelle, Sophie ; et al
in Journal of Nutrition and Metabolism (2011), 2011
Several factors, including fruit and vegetables intakes, have been shown to significantly influence the plasma concentrations of the two antioxidants vitamin C and β-carotene. Deficiency levels of 6 mg/L ... [more ▼]
Several factors, including fruit and vegetables intakes, have been shown to significantly influence the plasma concentrations of the two antioxidants vitamin C and β-carotene. Deficiency levels of 6 mg/L (34.2 μM) for vitamin C and of 0.22 mg/L (0.4 μM) for β-carotene have been suggested below which cardiovascular risk might be increased. The present study performed on 897 presumably healthy subjects aged 40–60 years aimed to examine how modifiable lifestyle factors may be related to vitamin C and/or β-carotene deficiency. Gender, smoking, lack of regular physical activity and of daily fruit consumption (≥2/day), and social status (in particular, unemployment) were found to be significant risk factors for vitamin C deficiency. For β-carotene deficiency, the same factors were identified except social status; moreover, overweight and OC use in women were also found to have a deleterious effect. For non exposed subjects, the probability of developing vitamin C deficiency was 4% in men and 2.4% in women. This probability increased to 66.3% for men and to 44.3% for women (and even to 50.4% under OC use), when all risk factors were present. For β-carotene deficiency, the corresponding probabilities were equal to 29.7% in men and 13.7% in women (no risk factor present), and to 86.1% for men and 69.9% (91.6% for OC use) for women (all factors present), respectively [less ▲]Detailed reference viewed: 89 (36 ULg)
Effets d’un accroissement en fruits et légumes sur neuf marqueurs de la peroxydation lipidique chez des sujets diabétiques de type 2.
PAQUOT, Nicolas ; PINCEMAIL, Joël ; et al
in Diabète & Métabolisme (2011), 37(suppl 1), 38Detailed reference viewed: 42 (12 ULg)
Influence of cultivar, harvest time, storage conditions, and peeling on the antioxidant capacity and phenolic and ascorbic acid contents of apples and pears."
Kevers, Claire ; PINCEMAIL, Joël ; Tabart, Jessica et al
in Journal of Agricultural and Food Chemistry (2011), 59
Apple and pear fruits are important sources of secondary plant metabolites and one of the major sources of dietary phenolics consumed all year round. The aim of this work was to identify the main ... [more ▼]
Apple and pear fruits are important sources of secondary plant metabolites and one of the major sources of dietary phenolics consumed all year round. The aim of this work was to identify the main variables influencing phenolic content and antioxidant capacity in apples. Higher phenolic and antioxidant contents were observed in some varieties (such as the Delbar Estival apple and Durondeau pear). Storage conditions were important. Our results also showed that fruits should be consumed rapidly after purchase and with their peel. After one week of domestic storage, the ascorbic acid content was found to decrease by 75%. Peeling led to a more than 25% decrease in total phenolics and ascorbic acid. The harvest time (at normal ripeness) had only a limited impact, but significant year-to-year variations were observed. In conclusion, well-chosen and well-stored apples and pears may contribute to an antioxidant-rich diet if consumed rapidly and with their peel. [less ▲]Detailed reference viewed: 31 (10 ULg)
Consequences of laparoscopy on liver ischemia during portal triad clamping in a swine model
; ; Gilson, Nathalie et al
in Acta Chirurgica Belgica (2010, April), 110Detailed reference viewed: 34 (7 ULg)
Oxidative Stress in the Cochlea: An Update.
Poirrier, Anne-Lise ; Pincemail, Joël ; et al
in Current Medicinal Chemistry (2010)
This paper will focus on understanding the role and action of reactive oxygen species (ROS) and reactive nitrogen species (RNS) in the molecular and biochemical pathways responsible for the regulation of ... [more ▼]
This paper will focus on understanding the role and action of reactive oxygen species (ROS) and reactive nitrogen species (RNS) in the molecular and biochemical pathways responsible for the regulation of the survival of hair cells and spiral ganglion neurons in the auditory portion of the inner ear. The pivotal role of ROS/RNS in ototoxicity makes them potentially valuable candidates for effective otoprotective strategies. In this review, we describe the major characteristics of ROS/RNS and the different oxidative processes observed during ototoxic cascades. At each step, we discuss their potential as therapeutic targets because an increasing number of compounds that modulate ROS/RNS processing or targets are being identified. [less ▲]Detailed reference viewed: 35 (7 ULg)
Evaluation of spectrophotometric methods for antioxidant compound measurement in relation to total antioxidant capacity in beverages.
Tabart, Jessica ; Kevers, Claire ; Pincemail, Joël et al
in Food Chemistry (2010), 120
The validity of different colorimetric methods used to quantify various families of antioxidant compounds was evaluated with standard compounds. The colorimetric tests for global evaluation of flavonoids ... [more ▼]
The validity of different colorimetric methods used to quantify various families of antioxidant compounds was evaluated with standard compounds. The colorimetric tests for global evaluation of flavonoids, anthocyans, and flavanols were found generally unreliable, as reactions could be different for individual compounds within a family (anthocyanins or flavonols or flavan-3-ols) and not specific to one family. In the flavonoid test, for example, flavonols reacted very well, anthocyanins did not react, and flavanons reacted only slightly. The same methods were applied also to beverages known for their antioxidant content (apple, orange, grape, and vegetable juices, ice tea, and red wine) and the data were compared with the results of HPLC analysis of specific compounds. The values obtained in a colorimetric test were generally higher than the sum of the values obtained for the corresponding individual compounds by HPLC analysis, mainly because other compounds can interfere with the colorimetric tests. For example, in wine, anthocyanin concentrations obtained by colorimetric test were 9068 1407 µ mol /100ml (mean SEM), higher than the sum of the six main anthocyanidins detected by HPLC, only 41 µmol/100 ml. The relative antioxidant capacity values determined for beverages on the basis of colorimetric tests could exceed by far the values previously measured in radical-scavenging tests (for instance, the antioxidant capacity attributable to anthocyans in wine on the basis of the colorimetric test was 50 times higher than the total antioxidant capacity measured by the ORAC assay). In conclusion, colorimetric tests for flavonoids, anthocyans, and flavanols appeared generally unreliable for estimating their content and thus the antioxidant capacity reliable to these compounds. [less ▲]Detailed reference viewed: 261 (87 ULg)
Consequences of laparoscopy on liver ischemia during portal triad clamping in a swine model
Gilson, Nathalie ; ; et al
in Acta Gastro-Enterologica Belgica (2010), 73(1), 13Detailed reference viewed: 42 (13 ULg)
Le pneumopéritoine aggrave l'ischémie hépatique lors du clampage hilaire dans un modèle porcin
; ; et al
in Journal de Chirurgie (2009, December), 146Detailed reference viewed: 63 (19 ULg)
Evaluation biologique du stress oxydant : application en routine clinique.
Pincemail, Joël ; Le Goff, Caroline ; Charlier, Corinne et al
in Nutritions & Endocrinologie (2009), DécDetailed reference viewed: 127 (29 ULg)
Dietary incorporation of feedstuffs naturally high in organic selenium for racing pigeons (Columba livia): effects on plasma antioxidant markers after a standardised simulation of a flying effort
Schoonheere, Nicolas ; Dotreppe, Olivier ; PINCEMAIL, Joël et al
in Journal of Animal Physiology & Animal Nutrition (2009), 93
Selenium is a trace element of importance for animal health. It is essential for adequate functioning of many enzymes such as, the antioxidant enzyme, glutathione peroxidase, which protects the cell ... [more ▼]
Selenium is a trace element of importance for animal health. It is essential for adequate functioning of many enzymes such as, the antioxidant enzyme, glutathione peroxidase, which protects the cell against free radicals. A muscular effort induces a rise in reactive oxygen species production which, in turn, can generate an oxidative stress. Two groups of eight racing pigeons were fed respectively with a diet containing 30.3 (control group) and 195.3 (selenium group) lg selenium/kg diet. The pigeons were submitted to a standardised simulation of a flying effort during 2 h. Blood was taken before and after the effort to measure antioxidant markers and blood parameters related to muscle metabolism. Plasma selenium concentration and glutathione peroxidase activity were significantly higher in the selenium group. There were no significant differences for the other measured parameters. As a consequence of the effort, the pigeons of the selenium group showed a higher increase of glutathione peroxidase activity and a smaller increase of plasma lactate concentration. Variations because of the effort in the other markers were not significantly different between the two groups. It is concluded that the selenium status was improved with the feeding of feedstuffs high in Selenium. [less ▲]Detailed reference viewed: 41 (5 ULg)
Exercise-induced oxidative stress in overweight adolescent girls: roles of basal insulin resistance and inflammation and oxygen overconsumption.
; ; Pincemail, Joël et al
in International Journal of Obesity & Related Metabolic Disorders (2009), 33(4), 447-55
HYPOTHESIS: Basal insulin resistance (IR) and inflammation exacerbate post-exercise oxidative stress (OS) in overweight adolescent girls. DESIGN: Cross-sectional study, effect of incremental ergocycle ... [more ▼]
HYPOTHESIS: Basal insulin resistance (IR) and inflammation exacerbate post-exercise oxidative stress (OS) in overweight adolescent girls. DESIGN: Cross-sectional study, effect of incremental ergocycle exercise until exhaustion on OS markers. PARTICIPANTS: Normal-weight (control) (n=17, body mass index (BMI): 20-24.2 kg/m(2)) and overweight adolescent girls (n=29, BMI: 24.1-36.6 kg/m(2)). MEASUREMENTS: Dietary measurement, physical activity assessment (validated questionnaires), fat distribution parameters (by dual-energy X-ray absorptiometry and anthropometry) and maximal oxygen consumption (VO2peak). Blood assays include the following: (1) at fasting state: blood cell count, lipid profile, and IR parameters (leptin/adiponectin ratio (L/A), homeostasis model assessment of IR, insulin/glucose ratio; (2) before exercise: inflammation and OS markers (interleukin-6 (IL-6), C-reactive protein (CRP), myeloperoxidase (MPO), reduced glutathione/oxidized glutathione ratio (GSH/GSSG), 15 F(2)alpha-isoprostanes (F(2)-Isop), lipid hydroperoxides (ROOH), oxidized low-density lipoprotein (ox-LDL)) and antioxidant status (superoxide dismutase (SOD), glutathione peroxidase (GPX), vitamin C, alpha-tocopherol and beta-carotene); and (3) after exercise: inflammation and OS markers. RESULTS: At rest, overweight girls had a deteriorated lipid profile and significantly higher values of IR parameters and inflammation markers, compared with the control girls. These alterations were associated with a moderate rest OS state (lower GSH/GSSG ratio, alpha-tocopherol/total cholesterol (TC) ratio and GPX activity). In absolute values, overweight girls exhibited higher peak power output and oxygen consumption (VO2peak), compared with the control girls. Exercise exacerbated OS only in the overweight group (significant increase in F(2)-Isop, ROOH and MPO). As hypothesized, basal IR and inflammation state were correlated with the post-exercise OS. However, the adjustment of F(2)-Isop, ROOH and MPO variation per exercise VO(2) variation canceled the intergroup differences. CONCLUSION: In overweight adolescent girls, the main factors of OS, after incremental exhaustive exercise, are not the basal IR and inflammation states, but oxygen overconsumption. [less ▲]Detailed reference viewed: 47 (5 ULg)
Comparative antioxidant capacities of phenolic compounds measured by various tests
Tabart, Jessica ; Kevers, Claire ; Pincemail, Joël et al
in Food Chemistry (2009), 113
The purpose of this study was to compare the antioxidant capacities of standard compounds (phenolic compounds, ascorbic acid, and glutathione) as measured by various assays. Five methods were selected so ... [more ▼]
The purpose of this study was to compare the antioxidant capacities of standard compounds (phenolic compounds, ascorbic acid, and glutathione) as measured by various assays. Five methods were selected so as to span a diversity of technical approaches: TEAC (radical 2,2′-azino-bis(3-ethylbenzothiazoline)-6 sulphonic acid), DPPH (radical 2,2-diphenyl-1-picryhydrazyl used to measure reducing capacity), ORAC (oxygen radical scavenging capacity), red blood cell haemolysis (protection of biological sample), and ESR (electron spin resonance for direct free radical evaluation). Most compounds showed significant differences in free radical scavenging activity according to the method used. Of the 25 tested compounds, only a few, such as myricetin and gallocatechin, gave comparable activities in the various tests. To standardise reporting on antioxidant capacity, it is proposed to use a weighted mean of the values obtained using the DPPH, ORAC, resistance to haemolysis, and ESR assays. This strategy was used to test the antioxidant capacity of several beverages. The highest antioxidant capacity was observed for red wine, followed by green tea, orange juice, grape juice, vegetable juice, and apple juice. [less ▲]Detailed reference viewed: 228 (29 ULg)
Stress oxydant et antioxydants: mythes et réalités.
Defraigne, Jean-Olivier ; Pincemail, Joël
in Revue Médicale de Liège (2008), 63Detailed reference viewed: 70 (9 ULg)
Evolution of antioxidant capacity during storage of selected fruits and vegetables
Kevers, Claire ; ; et al
in Journal of Agricultural and Food Chemistry (2007), 55(21), 8596-8603
Interest in the consumption of fresh fruits and vegetables is, to a large extent, due to its content of bioactive nutrients and their importance as dietary antioxidants. Among all of the selected fruits ... [more ▼]
Interest in the consumption of fresh fruits and vegetables is, to a large extent, due to its content of bioactive nutrients and their importance as dietary antioxidants. Among all of the selected fruits and vegetables, strawberries and black grapes have relatively high antioxidant capacities associated with high contents of total phenolic compounds, ascorbic acid, and flavonols. More interesting, the results of this study indicated that in most fruits and vegetables storage did not affect negatively the antioxidant capacity. Better, in some cases, an increase of the antioxidant capacity was observed in the days following their purchase, accompanied by an increase in phenolic compounds. In general, fruits and vegetables visually spoil before any significant antioxidant capacity loss occurs except in banana and broccoli. When ascorbic acid or flavonoids (aglycons of flavonols and anthocyanins) were concerned, the conclusions were similar. Their content was generally stable during storage. [less ▲]Detailed reference viewed: 95 (13 ULg)
Stress oxydant : comment évaluer le statut du patient?
Pincemail, Joël ; Haleng, Jeanine ; Le Goff, Caroline et al
in Nutrition Infos (2007), (oct/nov/déc), 47-50Detailed reference viewed: 70 (9 ULg)
Le stress oxydant
Haleng, Jeanine ; Pincemail, Joël ; Defraigne, Jean-Olivier et al
in Revue Médicale de Liège (2007), 62(10), 628-38
Oxidative stress is defined as an imbalance between the production of reactive oxygen species (ROS) and the antioxidant network, in favour of the former. Our lifestyle (smoking, alcoholism, obesity ... [more ▼]
Oxidative stress is defined as an imbalance between the production of reactive oxygen species (ROS) and the antioxidant network, in favour of the former. Our lifestyle (smoking, alcoholism, obesity, intense physical exercise), but also our inadequate diet, contributes to significantly increase the production of ROS in our organism. This is potentially associated with an increased risk of developing ageing-related pathologies such as cardiovascular diseases and cancer. As a matter of prevention, it is necessary to have in hands a high technology allowing to correctly evidence the oxidative stress status of an individual in order to render optimal our antioxidant defences and to decrease the oxidative damages in DNA, proteins and lipids. [less ▲]Detailed reference viewed: 1795 (18 ULg)