Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/61722
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Type: Journal article
Title: Effects of physiological hyperglycemia on duodenal motility and flow events, glucose absorption, and incretin secretion in healthy humans
Author: Kuo, P.
Wishart, J.
Bellon, M.
Smout, A.
Holloway, R.
Fraser, R.
Horowitz, M.
Jones, K.
Rayner, C.
Citation: Journal of Clinical Endocrinology and Metabolism, 2010; 95(8):3893-3900
Publisher: Endocrine Society
Issue Date: 2010
ISSN: 0021-972X
0021-972X
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Responsibility: 
Paul Kuo, Judith M. Wishart, Max Bellon, André J. Smout, Richard H. Holloway, Robert J. L. Fraser, Michael Horowitz, Karen L. Jones and Christopher K. Rayner
Abstract: Context: Acute hyperglycemia slows gastric emptying, but its effects on small intestinal motor activity and glucose absorption are unknown. In type 2 diabetes, the postprandial secretion of glucose-dependent insulinotropic polypeptide (GIP) is preserved, but that of glucagon-like peptide-1 (GLP-1) is possibly reduced; whether the latter is secondary to hyperglycemia or diabetes per se is unknown. Aim: The aim was to investigate the effects of acute hyperglycemia on duodenal motility and flow events, glucose absorption, and incretin hormone secretion. Methods: Nine healthy volunteers were studied on two occasions. A combined manometry/impedance catheter was positioned in the duodenum. Blood glucose was clamped at either 9 mmol/ liter (hyperglycemia) or 5 mmol/liter (euglycemia) throughout the study. Manometry and impedance recordings continued between T__10 min and T _ 180 min. Between T _ 0 and 60 min, an intraduodenal glucose infusion was given (_3 kcal/min), together with 14C-labeled 3-O-methylglucose (3-OMG) to evaluate glucose absorption. Results: Hyperglycemia had no effect on duodenal pressure waves or flow events during the 60 min of intraduodenal glucose infusion, when compared to euglycemia. During hyperglycemia, there was an increase in plasma GIP (P _ 0.05) and 14C-3-OMG (P _ 0.05) but no effect on GLP-1 concentrations in response to the intraduodenal infusion, compared to euglycemia. Conclusion: Acute hyperglycemia in the physiological range has no effect on duodenal pressure waves and flow events but is associated with increased GIP secretion and rate of glucose absorption in response to intraduodenal glucose.
Keywords: Duodenum; Humans; Hyperglycemia; Gastric Inhibitory Polypeptide; Glucagon; Insulin; Glucose; Blood Glucose; Analysis of Variance; Area Under Curve; Single-Blind Method; Manometry; Electric Impedance; Gastrointestinal Motility; Adult; Female; Male; Glucagon-Like Peptide 1; Incretins
Rights: Copyright © 2010 by The Endocrine Society
RMID: 0020100629
DOI: 10.1210/jc.2009-2514
Appears in Collections:Medicine publications

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