Slow GDP dissociation from the guanyl nucleotide-binding site of turkey erythrocyte membranes as the limiting step in the activation of adenylate cyclase by β-adrenergic agonists

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Na+-H+ exchange in the process of glucose-induced insulin release from the pancreatic B-cell. Effects of amiloride on 86Rb, 45Ca fluxes and insulin release

SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe

SURINFECTION PAR ASPERGILLUS DE BRULURES GRAVES

Aspergillus, which has a saprophytic life, is an opportunistic fungus and manifests his pathogenicity when a weakened state of the host facilitates its development. The conditions are particularly favorable in severely burned patients like the 54-year-old woman presented here. The criteria of pathogenicity of this opportunistic fungus, the incidence of epidemiology and prognosis of this type of infection and the clinical signs that allow an early diagnosis are discussed here.SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe

Na+-H+ exchange in the process of glucose-induced insulin release from the pancreatic B-cell. Effects of amiloride on 86Rb, 45Ca fluxes and insulin release.

The effect of amiloride, an inhibitor of Na+-H+ exchange, on intracellular pH (pHi), 86Rb outflow, 45Ca outflow and insulin release from pancreatic rat islets was examined. In the 0.1-1 mM range, amiloride transiently reduced pHi of glucose-deprived islets and allowed glucose to induce a sustained decrease in pHi of the islet cells. Amiloride reproduced the effect of glucose to decrease 86Rb and 45Ca outflow. In the presence of glucose (5.6 mM or more), amiloride (100 microM) acted synergistically with the sugar to reduce K+ outflow, and to stimulate 40Ca inflow and insulin release from perifused islets. These results add strong support to the view that the generation of protons through the metabolism of glucose represents an important step in the process of glucose-induced release. The stimulation by glucose of Na+-H+ exchange apparently masks and even overcomes the glucose-induced decrease in pHi otherwise expected from the increase in catabolic fluxes.Journal ArticleResearch Support, Non-U.S. Gov'tinfo:eu-repo/semantics/publishe

Lack of cardiovascular side effects of the new tricyclic antidepressant tianeptine. A double-blind, placebo-controlled study in young healthy volunteers.

In a double-blind, placebo-controlled, crossover study, the effects of therapeutic doses of the new tricyclic antidepressant tianeptine on cardiovascular function were closely monitored in 21 healthy volunteers during a 2-week treatment period. Blood pressure measurements, ECG recording, 24-h Holter monitoring, and echocardiography were carried out at 1-week intervals. Isotopic ventriculography was measured twice under each treatment. Tianeptine did not produce orthostatic hypotension or increase heart rate. No ECG changes could be observed and the cardiac conduction time remained unchanged. One subject presented with an increase in frequency of ventricular premature beats that could not be definitely attributed to the drug. Cardiac output assessed at rest and after a bicycle exercise stress test was not altered. The present study suggests that tianeptine is a tricyclic antidepressant endowed with less cardiac toxicity than classical tricyclic antidepressants.Clinical TrialControlled Clinical TrialJournal Articleinfo:eu-repo/semantics/publishe

Study of the bioequivalence of three oral formulations of ibopamine in healthy volunteers.

Ibopamine (SK & F 100168-A), a new chemical entity, is capable of eliciting positive inotropic effects accompanied by vasodilating, diuretic and saliuretic activity after oral administration. The relative bioavailability and bioequivalence of 3 oral presentations of Ibopamine was examined after a single oral dose. Thirty healthy subjects (15 males and 15 females) received the 3 formulations at one-week intervals according to "single-blind assayer" latin-square crossover design. Two tablets of 100 mg ibopamine (SIMES formulations), 2 tablets of 100 mg ibopamine (UK formulation) and 1 tablet of 200 mg ibopamine (US-Tiltab formulation) were used. In a 4th occasion, all volunteers received again the 200 mg-tablet of the US-Tiltab formulation in order to assess the intra-individual variability of its oral bioavailability. Free epinine plasma levels were measured before and 10, 20, 30, 45, 60, 90, 105 min and 2, 2.5, 3, 4, 6, 8 and 24 h after each oral administration. Free epinine was assayed by HPLC/electrochemical detection method. The amount of drug absorbed as measured by the area under the curve, AUC0-8 h, and the rate of absorption, as measured by Cmax and tmax, were compared by examining the symmetric 95% confidence intervals. If the symmetric 95% confidence interval with respect to AUC is between 80% and 120%, two formulations are considered bioequivalent.(ABSTRACT TRUNCATED AT 250 WORDS)Clinical TrialControlled Clinical TrialJournal Articleinfo:eu-repo/semantics/publishe

Study of the influence of nifedipine on the pharmacokinetics and pharmacodynamics of propranolol, metoprolol and atenolol

The influence of chronic therapy with nifedipine on the pharmacokinetics of propranolol 80 mg twice daily, metoprolol 100 mg twice daily and atenolol 100 mg once daily was investigated in eight healthy volunteers. Nifedipine 10 mg three times daily did not affect the pharmacokinetics of metoprolol and atenolol whereas nifedipine shortened the time to peak plasma concentration for propranolol by about 1 h. Propranolol, metoprolol and atenolol provoked comparable decreases in heart rate measured at rest and during exercise. The beta-adrenoceptor blocking properties of propranolol, metoprolol and atenolol were not affected by concomitant therapy with nifedipine. The present study did not show significant pharmacokinetic and pharmacodynamic interactions between nifedipine and lipophilic beta-adrenoceptor blockers.Journal ArticleResearch Support, Non-U.S. Gov'tSCOPUS: ar.jFLWINinfo:eu-repo/semantics/publishe

Interaction between nonsteroidal anti-inflammatory drugs and loop diuretics: modulation by sodium balance.

Nonsteroidal anti-inflammatory drugs have been shown to decrease the natriuretic response to loop diuretics in many but not all studies. Recently, indomethacin was shown not to affect the natriuretic response to the new loop diuretic torasemide in healthy volunteers. Inasmuch as sodium balance has been reported to modify the effect of indomethacin on furosemide-induced natriuresis in dogs, we investigated the effect of indomethacin, under two sodium balances (50 and 150 mEq/day), on the natriuretic response to two doses of torasemide in six healthy volunteers. Under the low sodium diet, indomethacin reduced the natriuretic response to torasemide like that to furosemide. In contrast, on the normal sodium diet, indomethacin failed to affect the natriuretic response to torasemide. Indomethacin reduced base-line and diuretic-induced increase in plasma renin activity, plasma angiotensin II levels and urinary excretion of prostaglandin 6-keto F1 alpha to a similar extent under the two sodium diets. Our data show that indomethacin reduces the natriuretic response to torasemide in humans. Dietary sodium restriction is a significant determinant of the interaction between nonsteroidal anti-inflammatory drugs and loop diuretics in healthy volunteers, presumably because it allows loop diuretics to provoke an increase in renal blood flow which participates in their natriuretic action and is blocked by nonsteroidal anti-inflammatory drugs.Journal Articleinfo:eu-repo/semantics/publishe