title: The effect of chronic hyperglycaemia on the islet B-cell responsiveness in newly diagnosed type 2 diabetes.
abstract: The aim of the present study was to evaluate the effect of chronic hyperglycaemia on the pancreatic B-cell response to stimulation with a standard mixed meal or intravenous glucagon in 7 subjects with newly diagnosed Type 2 diabetes. Stimulation was performed at mean chronic fasting hyperglycaemia of 11.8 +/- 0.7 (SEM) mmol l-1 and at normoglycaemia obtained by an intravenous infusion of regular insulin followed by an insulin wash-out period. The incremental plasma C-peptide area under the curve after stimulation with the meal was similar at normo- and hyperglycaemia. In contrast, prestimulatory plasma C-peptide and the incremental plasma C-peptide area under the curve after stimulation with glucagon were significantly higher at chronic hyperglycaemia than at normoglycaemia (p less than 0.01 and p less than 0.05). In conclusion, chronic hyperglycaemia as seen in newly diagnosed Type 2 diabetes is associated with a complete lack of potentiation of postprandial islet B-cell secretion but a partly preserved potentiation of basal and post-glucagon islet B-cell secretion.
authors.affiliation: Division of Endocrinology and Metabolism, University Clinic of Internal Medicine, Arhus Amtssyghus, Denmark.
authors.forename: H J
authors.initials: HJ
authors.lastname: Gjessing
authors.forename: B
authors.initials: B
authors.lastname: Reinhold
authors.forename: O
authors.initials: O
authors.lastname: Pedersen
mesh_terms: D001786:Blood Glucose / Q000378:metabolism; D002096:C-Peptide / Q000097:blood / Q000378:metabolism*; D003924:Diabetes Mellitus, Type 2 / Q000503:physiopathology*; D004435:Eating; D005260:Female; D005934:Glucagon; D006801:Humans; D006943:Hyperglycemia / Q000209:etiology / Q000503:physiopathology*; D007328:Insulin / Q000097:blood / Q000378:metabolism* / Q000627:therapeutic use; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008875:Middle Aged
chemical_list: D001786:Blood Glucose; D002096:C-Peptide; D007328:Insulin; D005934:Glucagon