Endogenous glucose release stimulated by oral sucrose administration in rats

Résumé On a examiné l'élevation de la glycémie chez les rats des 2 sexes après administration orale de sucrose. Une sécrétion de glucose semble prendre place en même temps que l'absorption de cette substance. On suggère un mécanisme basé sur l'interaction du glucagon, du glucose-6-phosphate et de l'insuline suivant l'administration de sucre. Les expériences témoins semblent éliminer la possibilité que ces résultats soient dus au stress.     

Effect of insulin on the glucose uptake of protozoa.

Insulin stimulates the glucose uptake of Tetrahymena pyriformis. This shows the presence of insulin receptors in Tetrahymena, consequently receptors may be present in a level of phylogenesis, where the natural contact between the given hormone and the cell is unnecessary and impossible.     

Effect of phosphate omission on glucose-induced insulin release in vitro

Summary In the isolated perfused rat pancreas, omission of extracellular phosphate (H₂PO ₄ ^– significantly reduces the insulin secretion in response to 16.7 mM glucose.     

Effect of phosphate omission on glucose-induced insulin release in vitro.

In the isolated perfused rat pancreas, omission of extracellular phosphate (H2PO-4) significantly reduces the insulin secretion in response to 16.7 mM glucose.     

Effect of dinitrophenol and glucose on amine release from isolated rabbit blood platelets

Zusammenfassung Agar-aktiviertes Kaninchenplasma (Anaphylatoxin) setztin vitro Histamin und Serotonin aus normalen Kaninchenblutplättchen frei. Dieser Effekt ist vom Stoffwechsel der Thrombocyten abhängig, da er durch Dinitrophenol gehemmt wird. Bei Anwesenheit von Glukose wird die Hemmung aufgehoben.     

Continuous registration of the pancreatic blood flow after intravenous application of glucose

Zusammenfassung Die Hyperglykämie nach einmaliger stossartiger Glukoseinjektion bewirkt einen Durchblutungsanstieg der Bauchspeicheldrüse. Dieser wurde kontinuierlich mit einem elektromagnetischen Blutstrommesser bei narkotisierten Hunden registriet. Der Anstieg setzt sich aus 2 Abschnitten zusammen, wovon der erste unspezifisch auch in der A. femoralis auftritt.     

Effect of gentamycin on insulin release and45Ca net uptake by isolated islets

Summary In isolated islets, gentamycin reduced both the⁴⁵Ca net uptake and insulin release induced by glucose, but failed to inhibit the insulin secretion provoked by the combination of Ba²⁺ and theophylline. This indicates that the inhibitory effect of gentamycin is due to a reduction of Ca²⁺ entry into B-cells instead of to a harmful effect upon the integrity of the effector system, responsible for the extrusion of the insulin containing granules.Supported by a Grant (No. 79/1872) from the São Paulo State Research Foundation (FAPESP), Brazil.     

Effect of glucose administration on release of prothrombin from rat liver microsomes during incubation

Résumé Les microsomes isolés du foic continuent à relâcher le prothrombin pendant l'incubation de façon désavantageuse pour la synthèse totale des protéines. L'accumulation est plus rapide quand les rats, soumis à un jeûne bref, étaient nourris de glucose avant le sacrifice.     

Effect of a restricted diet on the in vitro glucose-induced insulin release of aging rats

To study the effect of a sudden loss of body weight on the -cell function of aging rats, basal and glucose-induced insulin secretion was measured in pancreatic islets obtained from young (2-month-old), adult (12-month-old) and aging (24-month-old) rats, either fed ad libitum or fed a restricted diet (50% caloric restriction). Basal insulin secretion was similar in islets of young, adult and older rats. Glucose stimulated insulin release was significantly reduced in aging rats as compared to young animals. Animals fed a restricted diet showed a prolonged and higher secretory rate during first phase release when compared to animals fed ad libitum.     

Effect of a restricted diet on the in vitro glucose-induced insulin release of aging rats.

To study the effect of a sudden loss of body weight on the beta-cell function of aging rats, basal and glucose-induced insulin secretion was measured in pancreatic islets obtained from young (2-month-old), adult (12-month-old) and aging (24-month-old) rats, either fed ad libitum or fed a restricted diet (50% caloric restriction). Basal insulin secretion was similar in islets of young, adult and older rats. Glucose stimulated insulin release was significantly reduced in aging rats as compared to young animals. Animals fed a restricted diet showed a prolonged and higher secretory rate during first phase release when compared to animals fed ad libitum.     

Effect of insulin on the synthesis and release of lipid peroxide by cultured hepatocytes isolated from normal and diabetic rats

Lipid peroxide content in hepatocytes isolated from ketotic diabetic rats was higher than normal, and the release of peroxide into the media was also elevated for the initial 18 h. Insulin suppressed both peroxide release and synthesis by cultured hepatocytes isolated from normal and from diabetic rats.