Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/103116
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Intragastric administration of leucine or isoleucine lowers the blood glucose response to a mixed-nutrient drink by different mechanisms in healthy, lean volunteers |
Author: | Ullrich, S.S. Fitzgerald, P.C.E. Schober, G. Steinert, R.E. Horowitz, M. Feinle-Bisset, C. |
Citation: | American Journal of Clinical Nutrition, 2016; 104(5):1274-1284 |
Publisher: | American Society for Nutrition |
Issue Date: | 2016 |
ISSN: | 0002-9165 1938-3207 |
Statement of Responsibility: | Sina S Ullrich, Penelope CE Fitzgerald, Gudrun Schober, Robert E Steinert, Michael Horowitz and Christine Feinle-Bisset |
Abstract: | Background: The branched-chain amino acids leucine and isoleucine lower blood glucose after oral glucose ingestion, and the intraduodenal infusion of leucine decreases energy intake in healthy, lean men. Objective: We investigated the effects of the intragastric administration of leucine and isoleucine on the gastric emptying of, and blood glucose responses to, a physiologic mixed-macronutrient drink and subsequent energy intake. Design: In 2 separate studies, 12 healthy, lean subjects received on 3 separate occasions an intragastric infusion of 5 g leucine (leucine-5g) or an intragastric infusion of 10 g leucine (leucine-10g), an intragastric infusion of 5 g isoleucine (isoleucine-5g) or an intragastric infusion of 10 g isoleucine (isoleucine-10g), or a control. Fifteen minutes later, subjects consumed a mixed-nutrient drink (400 kcal, 56 g carbohydrates, 15 g protein, and 12 g fat), and gastric emptying (13C-acetate breath test) and blood glucose, plasma insulin, C-peptide, glucagon, glucagon-like peptide-1 (GLP-1), glucose-dependent insulinotropic polypeptide (GIP), and cholecystokinin (leucine study only) were measured for 60 min. Immediately afterward, energy intake from a cold, buffet-style meal was assessed. Results: Compared with the control, leucine-10g decreased the blood glucose area under the curve (AUC) (P < 0.05) and tended to reduce peak blood glucose (P = 0.07), whereas effects of leucine-5g were NS. Leucine-10g, but not leucine-5g, increased plasma insulin and C-peptide AUCs (P < 0.01 for both), but neither dose affected glucagon, GLP-1, GIP, cholecystokinin, gastric emptying, or energy intake. Compared with the control, isoleucine-10g reduced the blood glucose AUC and peak blood glucose (P < 0.01), whereas effects of isoleucine-5g were NS. Neither load affected insulin, C-peptide, glucagon, GLP-1, or GIP. Isoleucine-10g, but not isoleucine-5g, slowed gastric emptying (P < 0.05), but gastric emptying was not correlated with the blood glucose AUC. Isoleucine did not affect energy intake. Conclusions: In healthy subjects, both leucine and isoleucine reduced blood glucose in response to a mixed-nutrient drink but did not affect subsequent energy intake. The mechanisms underlying glucose lowering appear to differ; leucine stimulated insulin, whereas isoleucine acted insulin independently. These trials were registered at www.anzctr.org.au as 12613000899741 and 12614000837628. |
Keywords: | GIP GLP-1 branched-chain amino acids energy intake food intake gastric emptying glucagon gut hormones humans insulin |
Rights: | © 2016 American Society for Nutrition |
DOI: | 10.3945/ajcn.116.140640 |
Grant ID: | http://purl.org/au-research/grants/nhmrc/1078471 http://purl.org/au-research/grants/nhmrc/627002 http://purl.org/au-research/grants/nhmrc/1103020 |
Published version: | http://dx.doi.org/10.3945/ajcn.116.140640 |
Appears in Collections: | Aurora harvest 7 Medicine publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.