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  • 1
    ISSN: 1432-0428
    Keywords: Beta cell ; isolated pancreas ; insulin secretion ; acetylcholine ; eserine ; cholinergic receptors ; muscarinic receptors ; atropine ; muscarine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Studies of the role and nature of the cholinergic receptors acting on the secretion of isolated perfused rat pancreas have shown the following: The infusion of acetylcholine at a dose of 2.5 μM in the presence of a concentration of glucose of 1.5 g/1, provoked a first phase of immediate and important stimulation of the secretion of insulin; this initial peak of insulin secretion was followed by a second phase during which a new less intense stimulation occurred; the latter was followed by an inhibition appearing at a time that depended on the pancreas used. At a dose of 0.5 μM of acetylcholine, the first phase of stimulation always appeared; during the second phase some pancreases were inhibited, others remained stimulated. — The peak of insulin secretion obtained by stimulation with acetylcholine during the first phase was dose related. — Eserine intensified the effects of acetylcholine. — The presence of glucose was essential for the insulinsecretory action of acetylcholine. The muscarinic nature of the cholinergic receptors implicated in the secretion of insulin was demonstrated by the use of: — Atropine which completely blocked the effects of acetylcholine, — Muscarine which produced the same effects as acetylcholine on our pancreas preparation, effects which were equally inhibited by atropine. The cholinergic receptors of the endocrine beta cell of the islet of Langerhans of the pancreas are therefore of the muscarinic type.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0428
    Keywords: Glibenclamide ; hypoglycaemic sulphonamide ; oral antidiabetic substances ; islets of Langerhans ; islet development ; beta cells ; betacytotrophic action ; insulin secretion ; insulin synthesis ; diabetes prevention
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs ont montré chez la souris que le HB 419 administré chroniquement, stimule le développement des îlots de Langerhans et des cellules bêta. Ce produit est donc doué de l'≪action bêtacytotrophe. Chez le chien normal, l'administration pendant 4 mois de HB 419 a pour effets d'abaisser la glycémie à jeun ainsi que l'ensemble de la courbe de la glycémie nycthémérale.- L'expérimentation effectuée montre que sous l'influence de l'administration prolongée de HB 419, la quantité d'insuline endogène synthétisée et sécrétée en plus de la sécrétion normale est considérable.
    Abstract: Zusammenfassung Die Autoren zeigten an Mäusen, daß chronische Gaben von HB 419 die Entwicklung der Langerhans'schen Inseln und der B-Zellen fördern. Die Substanz besitzt also eine betacytotrophe Wirkung“.Bei normalen Hunden bewirkt Zufuhr von HB 419 über 4 Monate eine Senkung der Nüchternblutzucker-Werte und der 24 Std-Blutzuckerkurven. Unter den gewählten Versuchsbedingungen konnte demonstriert werden, daß es unter dem Einfluß einer Dauerzufuhr von HB 419 zu einer erheblichen Mehrproduktion und Mehrfreisetzung von endogenem Insulin kommt.
    Notes: Summary The authors have demonstrated that HB 419 chronically administered in the mouse, stimulated the development of the islets of Langerhans and particularly that of the beta cells. This substance is thus endowed with a “beta cytotrophic” action. — In the normal dog, HB 419 administered over a four-month period resulted in a decreased fasting glycaemia, as well as a decrease of the entire nyctohemeral glycaemia curve. The experiments carried out showed that under the influence of prolonged HB 419 administration, the amount of endogenous insulin synthesized and secreted over and above the normal secretory level, was considerable.
    Type of Medium: Electronic Resource
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