Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 63 (1985), S. 545-553 
    ISSN: 1432-1440
    Keywords: Type I diabetes ; Insulin resistance ; Euglycaemic clamp ; Insulin receptor binding ; Insulin antibodies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Insulin sensitivity was assessed using the euglycaemic clamp technique in eight type I diabetic patients (after overnight blood glucose normalization with an artificial pancreas) and in six healthy subjects. Basal insulin concentrations were higher in diabetic patients (25±4 µU/ml) than in control subjects (17±1 µU/ml;P〈0.05). Insulin infusion of 0.5, 1.0, 2.0 and 5.0 mU/kg per min during subsequent 2-h periods resulted in similar mean steady-state insulin concentrations in both groups. The mean dextrose requirements during the last 40 min of each period were nevertheless decreased in diabetic patients (1.6±0.5, 3.5±0.8, 6.5±0.7, 10.2±0.7 mg/kg per min) as compared with control subjects (4.7±0.3, 8.2±0.9, 10.2±0.9, 12.4±0.9 mg/kg per min). At low insulin concentrations dextrose requirements were diminished in all diabetic subjects. At the highest insulin levels, individual dose-response curves from only four patients were within the normal range. Under basal conditions, the monocyte receptor number was significantly reduced in diabetic patients (17,500±2,800 sites/cell) as compared with control subjects (26,700±2,500 sites/cell;P〈0.05), whereas there were no differences regarding empty site affinities. Receptor data did not differ in patients with normal and decreased maximal dextrose requirements. Insulin resistance is apparently a common feature of type I diabetes at serum insulin concentrations of approximately 100 µU/ml. Normalization of the insulin effect by higher insulin concentrations is not possible in all patients. Insulin antibodies at concentrations observed in this study (〈0.16 mU/ml) do not contribute significantly to insulin resistance; receptor and postreceptor defects are possibly more important.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-0428
    Keywords: Glucose ; duct ligation ; IMI ; secretin ; pancreozymin ; K-value
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé L'influence de la sécrétine et de la pancréozymine intravenieuses sur la sécrétion d'insuline a été étudiée chez des rats ayant une insuffisance pancréatique exocrine. La sécrétine et la pancréozymine ont causé une sécrétion d'insuline significative chez des rats normaux. L'effet de ces hormones a été différent chez les animaux ayant une insuffisance pancréatique exocrine; alors que la pancréozymine causait une sécrétion d'insuline chez ces animaux, la sécrétine n'en causait aucune. Le glucose intravenieux, quant à lui, produisait une augmentation d'insuline du sang même chez les rats ayant une insuffisance pancréatique exocrine. Il semble que seule l'action de la sécrétine sur la sécrétion d'insuline soit liée au pancréas exocrine intact. Par contre la pancréozymine stimule la sécrétion d'insuline même dans le cas d'une insuffisance pancréatique exocrine. Ces résultats in vivo sont indentiques à ceux obtenus avec les ilôts isolés du pancréas des rats.
    Abstract: Zusammenfassung Bei Ratten mit exokriner Pankreasinsuffizienz, erzeugt durch vollständige Ligatur sämtlicher Pankreasausführungsgänge mit anschließender fettiger Degeneration, wurde der Einfluß von Sekretin und Pankreozymin i.v. auf das immunologisch meßbare Insulin geprüft. Bei normalen Ratten führten Sekretin und Pankreozymin zu einer signifikanten Insulinausschüttung. Bei Tieren mit Pankreasinsuffizienz war ein unterschiedlicher Effekt beider Hormone nachzuweisen. Während Pankreozymin auch bei pancreasinsuffizierten Tieren einen deutlichen Anstieg der Insulinsekretion bewirkt, fehlt nach Sekretin die reaktive Insulinsecretion. I.v. Glucose bewirkte hingegen auch bei den pankreasinsuffizienten Ratten einen Insulinanstieg in Plasma. Offensichtlich ist lediglich die insulinstimulierende Wirkung von Sekretin an ein intaktes exokrines Pankreas gebunden, während Pankreozymin auch bei Pankreasinsuffizienz das Inselsystem zur Insulinabgabe veranlaßt. Diese Befunde in vivo sind übereinstimmend mit den Versuchen an isolierten Inseln der Ratten.
    Notes: Summary A comparison was made of the effects of the intestinal hormones secretin and pancreozymin on insulin secretion in non-diabetic rats with experimentically induced exocrine pancreatic insufficiency and in control animals. The rats with exocrine pancreatic insufficiency exhibited normal disappearence of glucose and secretion of insulin. In rats with exocrine pancreatic insufficiency secretin did not lead to any increase in insulin secretion in contrast to its effect in the controls. In rats with exocrine pancreatic insufficiency pancreozymin evoked secretion of insulin to the same extent as in the normal animals. — From these results it is inferred that the effect of secretion upon the β-cells of the rat is dependent upon the presence of intact exocrine pancreatic tissue. However, pancreozymin and glucose exert their effects upon the β-cells directly without the involvement of the exocrine portion of the pancreas. All of these findings made under conditions in vivo are in perfect accord with studies made on isolated islets of rats subjected to the same stimuli in the preparation in vitro.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...