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Original Articles

Glucagonostatic Actions and Reduction of Fasting Hyperglycemia by Exogenous Glucagon-Like Peptide I(7–36) amide in type I diabetic patients

  1. Werner O C Creutzfeldt, MD, FRCP,
  2. Nicola Kleine, MD,
  3. Berend Willms, MD,
  4. Cathrine Ørskov, MD,
  5. Jens J Holst, MD and
  6. Michael A Nauck, MD
  1. Department of Medicine, Georg-August-University Gottingen
  2. Fachklinik fur Diabetes und Stoffwechselkrankheiten Bad Lauterberg
  3. Department of Medicine, Ruhr-University, Knappschafts-Krankenhaus Bochum, Germany
  4. Departments of Anatomy and Physiology, Panum Institute, University of Copenhagen Denmark
  1. Address correspondence and reprint requests to Werner Creutzfeldt, MD, FRCP, Department of Medicine, Georg-August-University, Robert-Koch-Str. 40, D-37075 Göttingen, Germany
Diabetes Care 1996 Jun; 19(6): 580-586. https://doi.org/10.2337/diacare.19.6.580
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Abstract

OBJECTIVE Glucagon-like peptide I(7–36) amide (GLP-1) is a physiological incretin hormone that, in slightly supraphysiological doses, stimulates insulin secretion, lowers glucagon concentrations, and thereby normalizes elevated fasting plasma glucose concentrations in type II diabetic patients. It is not known whether GLP-1 has effects also in fasting type I diabetic patients.

RESEARCH DESIGN AND METHODS In 11 type I diabetic patients (HbA1c 9.1 ± 2.1%; normal, 4.2–6.3%), fasting hyperglycemia was provoked by halving their usual evening NPH insulin dose. In random order on two occasions, 1.2 pmol · kg−1 · min−1 GLP-1 or placebo was infused intravenously in the morning (plasma glucose 13.7 ± 0.9 mmol/l; plasma insulin 26 ± 4 pmol/l). Glucose (glucose oxidase method), insulin, C-peptide, glucagon, GLP-1, cortisol, growth hormone (immunoassays), triglycerides, cholesterol, and nonesterified fatty acids (enzymatic tests) were measured.

RESULTS Glucagon was reduced from ∼8 to 4 pmol/l, and plasma glucose was lowered from 13.4 ± 1.0 to 10.0 ± 1.2 mmol/l with GLP-1 administration (plasma concentrations ∼100 pmol, P < 0.0001), but not with placebo (14.2 ± 0.7 to 13.2 ± 1.0). Transiently, C-peptide was stimulated from basal 0.09 ± 0.02 to 0.19 ± 0.06 nmol/l by GLP-1 (P < 0.0001), but not by placebo (0.07 ± 0.02 to 0.07 ± 0.02). There was no significant effect on nonesterified fatty acids (P = 0.34), triglycerides (P = 0.57), cholesterol (P = 0.64), cortisol (P = 0.40), or growth hormone (P = 0.53).

CONCLUSIONS Therefore, exogenous GLP-1 is able to lower fasting glycemia also in type I diabetic patients, mainly by reducing glucagon concentrations. However, this alone is not sufficient to normalize fasting plasma glucose concentrations, as was previously observed in type II diabetic patients, in whom insulin secretion (C-peptide response) was stimulated 20-fold.

  • Received September 20, 1995.
  • Revision received January 11, 1996.
  • Accepted January 11, 1996.
  • Copyright © 1996 by the American Diabetes Association

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June 1996, 19(6)
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Glucagonostatic Actions and Reduction of Fasting Hyperglycemia by Exogenous Glucagon-Like Peptide I(7–36) amide in type I diabetic patients
Werner O C Creutzfeldt, Nicola Kleine, Berend Willms, Cathrine Ørskov, Jens J Holst, Michael A Nauck
Diabetes Care Jun 1996, 19 (6) 580-586; DOI: 10.2337/diacare.19.6.580

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Glucagonostatic Actions and Reduction of Fasting Hyperglycemia by Exogenous Glucagon-Like Peptide I(7–36) amide in type I diabetic patients
Werner O C Creutzfeldt, Nicola Kleine, Berend Willms, Cathrine Ørskov, Jens J Holst, Michael A Nauck
Diabetes Care Jun 1996, 19 (6) 580-586; DOI: 10.2337/diacare.19.6.580
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