References of "Lefebvre, Pierre"
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See detailImmunogenicity of semisynthetic human insulin in man. Long-term comparison with porcine monocomponent insulin.
Luyckx, A. S.; Daubresse, J. C.; Jaminet, C. et al

in Acta Diabetologica Latina (1986), 23(2), 101-6

The levels of circulating IgG-insulin antibodies were determined in two groups of diabetic patients before and at 3-month intervals after starting insulin treatment either with monocomponent porcine ... [more ▼]

The levels of circulating IgG-insulin antibodies were determined in two groups of diabetic patients before and at 3-month intervals after starting insulin treatment either with monocomponent porcine insulin (n = 17) or with human semisynthetic insulin (SH) (n = 16). Patients were followed during 15.1 +/- 1.0 and 19.9 +/- 1.1 months, respectively (m +/- SEM). In addition, the quality of metabolic control and residual B-cell function were evaluated in the group under treatment with SHI. The percentage of patients who remained antibody-free after 12-21 months of treatment was 67.75% in the human insulin-treated group and only 25-43% in the one receiving porcine insulin (p less than 0.01). Moreover, insulin antibody titers, when present, were usually lower in subjects treated with human insulin. In SHI-treated patients: metabolic control was excellent during the first months of treatment as evidenced by values of mean daily blood glucose (7.3 +/- 0.6 mmol/l), M-index according to Schlichtkrull (7.4 +/- 2.4) and Hb1c (6.8 +/- 0.6%); residual B-cell function, evaluated at 3-month intervals by a circadian profile of plasma C-peptide did not decrease throughout the study; and a significant deterioration of blood glucose control occurred after 18 months of treatment, which might have been due to a less intensive supervision of the patients by the physicians and/or less careful attention by the patients themselves. This observation confirms the need for a continuous education of the patients regardless of the type of insulin used. [less ▲]

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See detailInsulin-stimulated glucose disposal is not increased in anorexia nervosa.
Castillo, M.; Scheen, André ULg; Lefebvre, Pierre ULg et al

in Journal of Clinical Endocrinology and Metabolism (1985), 60(2), 311-4

Insulin-stimulated glucose disposal was investigated using the euglycemic hyperinsulinemic glucose clamp technique in six women with anorexia nervosa (27.3 +/- 4.9 yr old; weight, 38.8 +/- 6.6 kg) and ... [more ▼]

Insulin-stimulated glucose disposal was investigated using the euglycemic hyperinsulinemic glucose clamp technique in six women with anorexia nervosa (27.3 +/- 4.9 yr old; weight, 38.8 +/- 6.6 kg) and compared to results obtained in six normal women (22.6 +/- 1.2 yr old; weight, 58 +/- 2.5 kg) and seven obese women (26.8 +/- 7.7 yr old; weight, 92.5 +/- 13.8 kg). The glucose clamp was performed for 2 h using the Biostator and a continuous insulin infusion of 100 mU kg-1 h-1. Plasma levels of insulin were determined at 30-min intervals. Plasma levels of glucagon, FFA, glycerol, 3-hydroxy-butyrate, and alanine were measured basally. Blood glucose levels were similar in normal subjects and anorectic patients; they were slightly but significantly higher in the obese patients. The indices of insulin sensitivity measured were the MCR of glucose and the ratio of glucose infused to insulin infused (G/I). They were very similar in anorectic subjects [MCR, 13.5 +/- 2.4 (+/- SEM) ml kg-1 min-1; G/I, 5.2 +/- 0.9 mg/mU) and normal subjects (MCR, 13.5 +/- 1.7 ml kg-1 min-1; G/I, 5.2 +/- 0.4 mg/mU), but were significantly reduced in obese patients (MCR, 5.1 +/- 0.8 ml kg-1 min-1; G/I, 2.6 +/- 0.3 mg/mU; P less than 0.0025). Differences in plasma insulin among the three groups were not statistically significant. Plasma alanine levels were higher in anorectic than in normal or obese subjects, suggesting defective gluconeogenesis. Thus, insulin-stimulated glucose disposal is normal in patients with anorexia nervosa, a finding that contrasts with the previously reported increase in erythrocyte insulin receptors in this disease. [less ▲]

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See detailGlipizide increases plasma insulin but not C-peptide level after a standardized breakfast in type 2 diabetic patients.
Scheen, André ULg; Lefebvre, Pierre ULg; Luyckx, A. S.

in European Journal of Clinical Pharmacology (1984), 26(4), 471-4

Peripheral blood glucose, plasma insulin and C-peptide levels were investigated after giving a standardized breakfast (500 kcal, 60 g carbohydrates) to 10 nonobese Type 2 diabetic patients previously ... [more ▼]

Peripheral blood glucose, plasma insulin and C-peptide levels were investigated after giving a standardized breakfast (500 kcal, 60 g carbohydrates) to 10 nonobese Type 2 diabetic patients previously treated by diet alone. Each patient received at random, at 1 week intervals, either 5 mg glipizide (meal + glipizide) or a placebo (meal alone) 30 min before breakfast. Basal values of blood glucose, plasma insulin and C-peptide were similar on both occasions. After meal + glipizide, the blood glucose increase was sharply limited whereas the rise in plasma insulin was steeper and reached twice as high a level. In contrast, the rise in plasma C-peptide was similar in both conditions. Consequently, the areas under the curves (0-300 min) showed a marked reduction in blood glucose after meal + glipizide (2289 +/- 149 versus 3101 +/- 169 mmol X min/1; 2p less than 0.001), associated with a significant increase in plasma insulin (14219 +/- 3261 versus 7591 +/- 1173 microU X min/ml; 2p less than 0.025) but no significant change in plasma C-peptide (342 +/- 45 versus 326 +/- 34 pmol X min/ml; N.S.). The insulin/C-peptide molar ratio was thus significantly increased after meal + glipizide (0.41 +/- 0.06 versus 0.23 +/- 0.04 at the 60th min; 2p less than 0.02). The dissociation between the responses of insulin and C-peptide suggests that a single dose of 5 mg glipizide in Type 2 diabetic subjects may enhance availability of peripheral insulin by extrapancreatic mechanism(s). This phenomenon may result in a higher circulating level of the hormone and therefore represent a further mode of action of sulphonylureas.(ABSTRACT TRUNCATED AT 250 WORDS) [less ▲]

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See detailMetabolic alterations after a two-hour nocturnal interruption of a continuous subcutaneous insulin infusion.
Scheen, André ULg; Castillo, M.; Jandrain, Bernard ULg et al

in Diabetes Care (1984), 7(4), 338-42

In order to evaluate the metabolic consequences of a 2-h nocturnal interruption of continuous subcutaneous insulin infusion (CSII), seven insulin-dependent diabetic patients without residual insulin ... [more ▼]

In order to evaluate the metabolic consequences of a 2-h nocturnal interruption of continuous subcutaneous insulin infusion (CSII), seven insulin-dependent diabetic patients without residual insulin secretion were investigated. The changes in blood glucose, plasma free insulin, glucagon, free fatty acids, and 3-hydroxybutyrate (3 OH-B) concentrations have been compared during two randomized tests carried out either during the normal functioning of a Mill-Hill pump from 10 p.m. to 8 a.m. (1.00 +/- 0.06 U insulin/h, keeping adequate metabolic control) or during the same conditions but with a deliberate arrest of the pump between 11 p.m. and 1 a.m. Considering the value recorded at 11 p.m. as reference, interruption of the insulin infusion resulted in: (1) a rapid (already significant after 1 h) and sustained (maximal fall: --12.5 +/- 2.5 mU/L at 3 a.m.) decrease in plasma free insulin; (2) a delayed (significant after 4 h) and linear rise in blood glucose (maximal increase: + 4.0 +/- 1.3 mmol/L at 5 a.m.); (3) an early (significant at midnight) and prolonged rise in plasma free fatty acids (+ 387 +/- 148 mumol/L at 3 a.m.); (4) a delayed (significant after 3 h) and sustained increase in plasma 3 OH-B (+ 347 +/- 88 mumol/L at 3 a.m.); and (5) no significant changes in plasma glucagon. Thus, a 2-h interruption of CSII in resting nocturnal conditions is sufficient to induce significant, delayed, and sustained metabolic alterations in C-peptide-negative patients despite good baseline blood glucose control. Resetting the pump at its basal rate is insufficient to quickly restore adequate circulating insulin levels and effectively counteract the metabolic disturbances. The efficacy of a bolus insulin injection in these conditions should be evaluated. [less ▲]

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See detailA 6-hour nocturnal interruption of a continuous subcutaneous insulin infusion: 1. Metabolic and hormonal consequences and scheme for a prompt return to adequate control.
Krzentowski, G.; Scheen, André ULg; Castillo, M. et al

in Diabetologia (1983), 24(5), 314-8

Interruption of a continuous subcutaneous insulin infusion, most often due to technical problems occurring during the night, is a not uncommon event whose metabolic consequences have received relatively ... [more ▼]

Interruption of a continuous subcutaneous insulin infusion, most often due to technical problems occurring during the night, is a not uncommon event whose metabolic consequences have received relatively little attention until now. We have therefore investigated the changes in blood glucose, plasma non-esterified fatty acids, 3-hydroxybutyrate, glucagon and free insulin in eight C-peptide negative Type 1 diabetic patients whose pumps were deliberately stopped between 23.00 h and 05.00 h. A control test with the pump functioning normally was carried out in each patient and the studies were randomized. Considering the values at 23.00 h as reference, interruption of the insulin infusion resulted in (1) a rapid decrease in plasma free insulin significant after 1 h and reaching a nadir of 6 +/- 2 mU/l after 6 h; (2) a rise in blood glucose which was significant at hour 3 and reached 17.4 +/- 1.9 mmol/l at hour 6; (3) a moderate increase in plasma nonesterified fatty acids which remained in the range of 700-800 mumol/l; (4) an early and linear rise in plasma 3-hydroxybutyrate, significant after 1 h and averaging 1290 +/- 140 mumol/l after 6 h; (5) a late increase (hour 5) in plasma glucagon. The second aim of our study was to provide for the patient a precise scheme of insulin supplements administered via the pump and based on blood glucose monitoring (Dextrostix - Glucometer) and semi-quantitative evaluation of ketonuria (Acetest). Resetting the pump at its basal rate at 05.00 h and giving insulin supplements (2-8 U) at 06.45 h (with the usual breakfast dose) and again at 10.00 h have proved efficacious in restoring satisfactory metabolic control by noon the day after starting the experiment. These results form practical recommendations to patients undergoing this type of accident. [less ▲]

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See detailBlood collection while using a continuous glucose analyzer without insertion of an additional venous catheter.
Castillo, M. J.; Scheen, André ULg; Luyckx, A. S. et al

in Diabetologia (1983), 25(2), 120-2

A new method for continuous blood collection using the Biostator is described. Blood is withdrawn through the double lumen catheter by a tube installed in the optional channel of the infusion pump. The ... [more ▼]

A new method for continuous blood collection using the Biostator is described. Blood is withdrawn through the double lumen catheter by a tube installed in the optional channel of the infusion pump. The amount of blood withdrawn from the patient is slightly greater than that necessary for continuous glucose analysis; the excess blood can be collected into assay tubes. Blood collection is continuous and produces a sample of diluted heparinized blood. The volume of blood collected depends on the size of the tube used, i.e. for a tube with a lumen diameter of 0.020 inches, the mean (+/- SD) volume collected was 1.21 +/- 0.07 ml/10 min (n = 13). The mean time interval between sampling and arrival at the glucose sensor by the double lumen catheter was 119 versus 108 s with the conventional method. The proposed modification does not affect blood glucose measurements (correlation coefficient compared with the reference method r = 0.9572; n = 13). To compensate for blood dilution, a dilution-factor depending on tubing diameter has to be calculated in each experiment. [less ▲]

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See detailMetabolic adaptation to prolonged exercise in severely obese subjects.
Scheen, André ULg; Pirnay, Freddy ULg; Luyckx, A. S. et al

in International Journal of Obesity & Related Metabolic Disorders (1983), 7(3), 221-9

In investigating the metabolic adaptation to prolonged exercise in markedly obese subjects, we compared blood glucose, plasma lactate, free fatty acids, insulin and glucagon concentrations during 3 h of ... [more ▼]

In investigating the metabolic adaptation to prolonged exercise in markedly obese subjects, we compared blood glucose, plasma lactate, free fatty acids, insulin and glucagon concentrations during 3 h of treadmill exercise in nine severely obese male patients (OB) (weight excess 84 +/- 7 per cent of their ideal body weight) and in nine healthy controls (C). Speed and slope of treadmill were selected to give a similar oxygen consumption in both groups (OB: 1.61 +/- 0.08 1/min; C: 1.72 +/- 0.07 1/min). Under these conditions, heart rate was similar in both groups, whereas ventilation was significantly lower in overweight subjects. In obese patients, plasma free fatty acid (FFA) levels were higher in the basal state (OB: 740 +/- 43 mumol/l; C: 602 +/- 40 mumol/l, 2 P less than 0.05) but showed a lower increase during the exercise period (OB: + 576 +/- 135 mumol/l; C: + 1071 +/- 100 mumol/l, 2 P less than 0.02). This impaired FFA mobilization was related to significantly higher insulin (IRI) levels throughout the exercise period as shown by the regression line of exercise-induced FFA increase (y, mumol/l) vs mean plasma IRI during exercise (x, microU/ml): y = 1238 - 60 x, r = -0.709, 2 P less than 0.001. Lack of glucagon increase could also contribute to the lower rise of FFA in obese subjects. A correspondingly increased contribution of carbohydrates to the energy supply is suggested by a significant decline in blood glucose and higher lactate plasma concentrations during the second half of the exercise period in overweight patients. These abnormalities could represent a metabolic limitation for performing prolonged exercise in markedly obese patients. [less ▲]

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See detailEffect of protein-supplemented fasting on the fuel-hormone response to prolonged exercise in obese subjects.
Scheen, André ULg; Luyckx, A. S.; Fossion, A. et al

in International Journal of Obesity & Related Metabolic Disorders (1983), 7(4), 327-37

This study aimed at investigating the influence of protein-supplemented fasting (PSF) on the tolerance and the fuel-hormone response to endurance exercise in the severely obese subject. For this purpose ... [more ▼]

This study aimed at investigating the influence of protein-supplemented fasting (PSF) on the tolerance and the fuel-hormone response to endurance exercise in the severely obese subject. For this purpose, eight obese men (27 +/- 2 yr, 182 +/- 7 per cent of ideal body weight) exercised on a horizontal treadmill (4 km/h) during 3 h before and after 13 d of PSF (Alburone, 70 g protein/day). Because of the 8.9 +/- 0.7 kg weight loss and the corresponding lower energy cost, exercise oxygen consumption decreased from 1.6 +/- 0.1 (before PSF) to 1.4 +/- 0.1 l/min (after PSF). In contrast, mean exercise heart rate was identical (119 +/- 5/min) in both conditions, resulting in a lower oxygen pulse after PSF. The mean respiratory quotient measured during exercise was lower after PSF (0.72 +/- 0.01 vs 0.75 +/- 0.01 2 P less than 0.05), thus demonstrating a higher fat utilization. This was supported by a higher exercise-induced plasma free fatty acid (FFA) mobilization after PSF (delta plasma FFA: + 675 +/- 101 vs + 376 +/- 121 mumol/l, 2 P less than 0.05). This metabolic adaptation mainly results from two mechanisms: a significantly lower plasma IRI at rest and during exercise after PSF (5.7 +/- 0.8 vs 11.4 +/- 1.4 microunits/ml, 2 P less than 0.001); and a lower basal blood glucose (4.2 +/- 0.2 vs 4.6 +/- 0.1 mmol/l) and an earlier decrease of glucose (30th vs 90th min) during exercise after PSF, suggesting a relative depletion of the carbohydrates stores. The lipolytic hormones (glucagon, epinephrine, norepinephrine, cortisol, growth hormone) did not significantly increase during exercise after PSF when compared to exercise before PSF; thus, their role in the enhanced FFA mobilization appears less important. Only two of our eight subjects were unable to achieve the third hour of exercise after PSF; however, no major clinical events or electrocardiographical disturbances were observed in any of the eight subjects. In conclusion, moderate exercise can be tolerated at least for 2 h during PSF when appropriate fluid, mineral and vitamin therapy is given. Under these conditions it induces a preferential utilization of fat-derived substrates and selectively augments fat mobilization which favors weight loss. For these reasons, moderate exercise can be recommended under strict medical supervision as part of all weight reduction therapy. [less ▲]

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See detailFate of exogneous glucose metabolism during exercise of different intensities in humans
Pirnay, Freddy ULg; Krzentowski, G.; Crielaard, Jean-Michel ULg et al

in Journal of Applied Physiology (1982), 53

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See detailHormonal and metabolic adaptation to protein-supplemented fasting in obese subjects.
Scheen, André ULg; Luyckx, A. S.; Scheen, Myriam ULg et al

in International Journal of Obesity & Related Metabolic Disorders (1982), 6(2), 165-74

Thirty hospitalized, severely obese patients (40 +/- 2 yr, 82 +/- 4 percent weight excess) were submitted to a 13-d protein-supplemented fast (PSF) with 70 g milk proteins/d (1.26 MJ or 300 kcal). The ... [more ▼]

Thirty hospitalized, severely obese patients (40 +/- 2 yr, 82 +/- 4 percent weight excess) were submitted to a 13-d protein-supplemented fast (PSF) with 70 g milk proteins/d (1.26 MJ or 300 kcal). The mean weight loss during PSF was 5.4 +/- 0.3 kg corresponding to 422 +/- 39 g/d. Comparison of the urinary nitrogen excretion with daily protein intake revealed that the nitrogen balance was equilibrated during PSF. Blood glucose decreased moderately but significantly during the whole PSF period whereas plasma insulin was only reduced during the first 9 d and tended to rise thereafter. Plasma FFA increased rapidly and remained elevated until the end of the study (+ 60 per cent); serum total cholesterol and plasma triglycerides showed a 26 and a 35 per cent decrease respectively. Basal plasma glucagon was slightly increased. Due to the low sodium intake (42 mmol/d) urinary sodium excretion dropped rapidly. Simultaneously both systolic (-13 mmHg) and diastolic (-7 mmHg) arterial blood pressure decreased significantly. The biological tolerance was good: metabolic acidosis was prevented with sodium bicarbonate, excessive rise in serum uric acid was corrected with allopurinol and a marked decrease in serum potassium was avoided with an appropriate dose of spironolactone. Twenty-six patients could be weighed 6 to 15 months after PSF: 12 showed a further weight reduction (6.6 +/- 1.6 kg) and seven a discrete weight gain (1.0 +/- 0.4 kg). Thus, PSF was well accepted and was profitable in 19 out of our 30 patients. It should be restricted to cases of severe and refractory obesity and performed under careful medical supervision. [less ▲]

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See detailEffect of indomethacin on the metabolic and hormonal response to a standardized breakfast in normal subjects.
Luyckx, A. S.; Guerten, D.; Scheen, André ULg et al

in Acta Diabetologica Latina (1981), 18(3), 259-66

We have investigated the influence of a single oral administration of indomethacin on blood glucose, plasma free fatty acids (FFA), alpha-amino-nitrogen, insulin and glucagon concentrations in young ... [more ▼]

We have investigated the influence of a single oral administration of indomethacin on blood glucose, plasma free fatty acids (FFA), alpha-amino-nitrogen, insulin and glucagon concentrations in young healthy subjects. Two groups of 6 subjects were studied, the first received a standardized 500 kcal mixed meal without any previous drug administration (controls) whereas the second group received 50 mg indomethacin 2 h before ingesting an identical meal. Plasma indomethacin concentration reached its maximum (2.36 +/- 0.36 micro g/ml) 15 min after administration and declined to 0.45 +/- 0.04 micro g/ml after 2 h. Indomethacin ingestion was followed by a significant increase in blood glucose and plasma FFA reaching their maximum value at 45 min and returning to basal levels at 120 min. No simultaneous changes in plasma alpha-amino-nitrogen, insulin or glucagon levels were detected during this period. The meal was followed by a rise in blood glucose and plasma insulin as well as by a decrease in plasma FFA concentration. No significant differences were detected between the controls and the subjects receiving indomethacin. In controls, the meal was followed by a rise in plasma alpha-amino-nitrogen and a modest although significant increase in glucagon levels. In indomethacin-treated subjects, the increment of alpha-amino-nitrogen was less marked and the increase in plasma glucagon was not observed. Thus, indomethacin by itself can exert several metabolic effects; however, it does not deteriorate the blood glucose or insulin profile after a regular meal. The present work is the first to demonstrate that an inhibitor of prostaglandin synthesis inhibits the plasma glucagon rise occurring after a physiological stimulus such as a normal meal. On the basis of previous in vitro experiments, we suggest that this effect results from an inhibition of glucagon secretion by the PG synthesis inhibitor. [less ▲]

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See detailOxidation and orally administrated 'naturally labeled 13C-glucose' during prolonged muscular exercise : 100g versus 4 x 250g
Pirnay, Freddy ULg; Krzentowski, G.; Crielaard, Jean-Michel ULg et al

in Poortmans, J. (Ed.) Biochemistry of exercise IV-A : 4th International Symposium of Biochemistry on Exercise, June 19-22, 1979, Bruxelles (1981)

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