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Inhibition of dipeptidyl peptidase IV activity by oral metformin in Type 2 diabetes

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Lindsay, JR, Duffy, NA, McKillop, Aine, Ardill, J, O'Harte, Finbarr, Flatt, Peter and Bell, PM (2005) Inhibition of dipeptidyl peptidase IV activity by oral metformin in Type 2 diabetes. DIABETIC MEDICINE, 22 (5). pp. 654-657. [Journal article]

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Abstract

Aims Glucagon-like peptide-1 (GLP-1) and gastric inhibitory polypeptide (GIP) are important insulinotropic hormones that enhance the insulin secretory response to feeding. Their potential for treating Type 2 diabetes is limited by short biological half-life owing to degradation by dipeptidyl peptidase IV (DPP IV). We investigated the acute effects of metformin on DPP IV activity in Type 2 diabetes to elucidate inhibition of DPP IV as a possible mechanism of action. Methods Eight fasting subjects with Type 2 diabetes (5M/3F, age 53.1 +/- 4.2 years, BMI 36.8 +/- 1.8 kg/m(2), glucose 8.9 +/- 1.2 mmol/l, HbA(1c) 7.8 +/- 0.6%) received placebo or metformin 1 g orally 1 week apart in a random, crossover design. Results Following metformin, DPP IV activity was suppressed compared with placebo (AUC(0-6 h) 3230 +/- 373 vs. 5764 +/- 504 nmol ml/l, respectively, P = 0.001). Circulating glucose, insulin and total GLP-1 were unchanged. Metformin also concentration-dependently inhibited endogenous DPP IV activity in vitro in plasma from Type 2 diabetic subjects. Conclusion Oral metformin effectively inhibits DPP IV activity in Type 2 diabetic patients, suggesting that the drug may have potential for future combination therapy with incretin hormones.

Item Type:Journal article
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > School of Biomedical Sciences
Research Institutes and Groups:Biomedical Sciences Research Institute
Biomedical Sciences Research Institute > Diabetes
ID Code:3003
Deposited By:Professor Peter Flatt
Deposited On:18 Dec 2009 10:03
Last Modified:28 Feb 2011 11:08

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