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  • Title: Normalization of fasting hyperglycaemia by exogenous glucagon-like peptide 1 (7-36 amide) in type 2 (non-insulin-dependent) diabetic patients.
    Author: Nauck MA, Kleine N, Orskov C, Holst JJ, Willms B, Creutzfeldt W.
    Journal: Diabetologia; 1993 Aug; 36(8):741-4. PubMed ID: 8405741.
    Abstract:
    Glucagon-like peptide 1 (GLP-1) (7-36 amide) is a physiological incretin hormone that is released after nutrient intake from the lower gut and stimulates insulin secretion at elevated plasma glucose concentrations. Previous work has shown that even in Type 2 (non-insulin-dependent) diabetic patients GLP-1 (7-36 amide) retains much of its insulinotropic action. However, it is not known whether the magnitude of this response is sufficient to normalize plasma glucose in Type 2 diabetic patients with poor metabolic control. Therefore, in 10 Type 2 diabetic patients with unsatisfactory metabolic control (HbA1c 11.6 +/- 1.7%) on diet and sulphonylurea therapy (in some patients supplemented by metformin or acarbose), 1.2 pmol x kg-1 x min-1 GLP-1 (7-36 amide) or placebo was infused intravenously in the fasting state (plasma glucose 13.1 +/- 0.6 mmol/l). In all patients, insulin (by 17.4 +/- 4.7 nmol x 1-1 x min; p = 0.0157) and C-peptide (by 228.0 +/- 39.1 nmol x 1-1 x min; p = 0.0019) increased significantly over basal levels, glucagon was reduced (by -1418 +/- 308 pmol x 1-1 x min) and plasma glucose reached normal fasting concentrations (4.9 +/- 0.3 mmol/l) within 4 h of GLP-1 (7-36 amide) administration, but not with placebo. When normal fasting plasma glucose concentrations were reached insulin returned towards basal levels and plasma glucose concentrations remained stable despite the ongoing infusion of GLP-1 (7-36 amide). Therefore, exogenous GLP-1 (7-36 amide) is an effective means of normalizing fasting plasma glucose concentrations in poorly-controlled Type 2 diabetic patients.(ABSTRACT TRUNCATED AT 250 WORDS)
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