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Vaag AA, Holst JJ, Volund A, Beck-Nielsen H. Gut incretin hormones in identical twins discordant for non-insulin-dependent diabetes mellitus (NIDDM)—evidence for decreased glucagon-like peptide 1 secretion during oral glucose ingestion in NIDDM twins. Eur J Endocrinol 1996;135:425–32. ISSN 0804–4643
The incremental glucagon-like peptide 1 (GLP-1) and gastric inhibitory polypeptide (GIP) responses (areas under curves; AUCs) were determined during a standard 180-min 75-g oral glucose tolerance test in a group of 12 identical twin pairs discordant for non-insulin-dependent diabetes mellitus (NIDDM) and 13 matched controls without family history of diabetes using highly sensitive and specific radioimmunoassay hormone assays. Data were analysed using multifactor analysis of variance (ANOVA) to identify and correct for possible covariates and to correct for multiple comparisons. Fasting plasma GLP-1 and GIP concentrations were similar in all groups. The twins with frank NIDDM had a decreased incremental GLP-1 response during oral glucose ingestion compared with controls without family history of diabetes (AUC±SEM; 0.55 ± 0.14 vs 1.17 ± 0.25 (mmol/l) x min, p < 0.05). The incremental GLP-1 secretion in the non-diabetic twins was not significantly different from neither their NIDDM co-twins nor the controls without family history of diabetes. The incremental GIP responses were similar in all study groups. Gender was identified as the major independent covariate for incremental glucose, insulin, GIP and GLP-1 responses, with higher values of all parameters in females. Waist-to-hip ratio and body mass index (BMI) were identified as independent but oppositely directed covariates for the incremental GLP-1 responses (waist-to-hip ratio: r = 0.43, p < 0.02; BMI: r= –0.34, p = 0.06). Incremental GLP-1 responses correlated with incremental insulin responses in the combined study population (N = 37; R = 0.42, p = 0.01). In conclusion, a decreased intestinal GLP-1 secretion may contribute to the abnormal insulin secretion during oral glucose ingestion in NIDDM twins. However, decreased secretion of gut incretin hormones (GLP-1 or GIP) does not explain all of the defects of pancreatic insulin secretion in NIDDM patients/twins or in non-diabetic individuals (identical twins) with a genetic predisposition to NIDDM.
Allan Vaag, Odense University Hospital, Department of Endocrinology and Internal Medicine M, Sdr. Boulevard, Odense, DK-5000, Denmark
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