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Table of Contents
Vol. 56, No. 2, 1995
Issue release date: 1995
Section title: Original Paper
Digestion 1995;56:117–126
(DOI:10.1159/000201231)

Glucagon-Like Peptide-1 and Glucose-Dependent Insulin-Releasing Polypeptide Plasma Levels in Response to Nutrients

Herrmann C. · Göke R. · Richter G. · Fehmann H.-C. · Arnold R. · Göke B.
Clinical Research Unit for Gastrointestinal Endocrinology, Department of Internal Medicine, Philipps University of Marburg, Germany

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: September 30, 1993
Accepted: March 21, 1994
Published online: February 05, 2009
Issue release date: 1995

Number of Print Pages: 10
Number of Figures: 0
Number of Tables: 0

ISSN: 0012-2823 (Print)
eISSN: 1421-9867 (Online)

For additional information: http://www.karger.com/DIG

Abstract

The nutrient-dependent glucagon-like peptide-1 (7-36) amide (GLP-1) release was studied in comparison to the glucose-dependent insulin-releasing polypeptide (GIP) response in 10 healthy volunteers each undergoing various protocols. Plasma samples were saved up to 120 min after challenges by oral, intravenous or intraduodenal administration of nutrients. Basal plasma-GLP-1 concentrations ranged between 0.4 and 1.4 pM, maximal postprandial GLP-1 levels peaked between 10 and 12 pM. Intravenous glucose (25 g i.v.) did not change basal GLP-1 levels. Oral administration of glucose (50 g) induced a biphasic GLP-1 release peaking at 30-60 min and a biphasic GIP release peaking at 5 and 45 min. This increase paralleled the secretion of insulin. Oral galactose (100 g) and amino acids (25 g) also induced a rapid plasma GLP-1 response. After fat (67 g corn oil) a strong and long-lasting ( > 120 min) increase of GLP-1 plasma levels occurred. When a mixed liquid meal was given (6 g soybean oil, 5g casein, 13 g glucose) immunoreactive (IR)-GLP-l rapidly increased and peaked after 5 min with declining levels after 30 min. In response to an intraduodenal infusion of a small glucose load (5.34 g within 120 min) a rapid, short-lasting GLP-1 response occurred whereas plasma GIP and insulin levels remained unaltered. Luminal perfusion of an isolated vascularly perfused rat ileum with a polydiet induced a rapid rise of portally released IR-GLP-1 which was followed by a sustained release. Glucose evoked sodium-dependently a sharp increase of IR-GLP-1 levels followed by a plateau release. The intraluminal infusion of a mixture of amino acids or fat was without any effect on IR-GLP-1. We hypothesize that in contrast to GIP the GLP-1 release from L cells is triggered by nervous reflexes, by putative humoral factor(s) being released from the upper small intestine in addition to nutrient stimuli acting at the luminal surface of the gut.

© 1995 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: September 30, 1993
Accepted: March 21, 1994
Published online: February 05, 2009
Issue release date: 1995

Number of Print Pages: 10
Number of Figures: 0
Number of Tables: 0

ISSN: 0012-2823 (Print)
eISSN: 1421-9867 (Online)

For additional information: http://www.karger.com/DIG


Copyright / Drug Dosage / Disclaimer

Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher or, in the case of photocopying, direct payment of a specified fee to the Copyright Clearance Center.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.