Cited by 139Gastrointestinal motility and disordersNeuropeptides and Animal PhysiologyDiabetes Treatment and Management

Inhibitory effect of glucagon-like peptide-1 on small bowel motility. Fasting but not fed motility inhibited via nitric oxide independently of insulin and somatostatin.

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Tolessa, T, Gutniak, M, Holst, J J, Efendic, S, Hellström, P M·1998·Journal of Clinical Investigation

Abstract

Effects of glucagon-like peptide-1 (GLP-1)(7-36)amide on fasted and fed motility in the rat small intestine were investigated in relation to its dependence on nitric oxide (NO), insulin, and somatostatin.Small bowel electromyography was performed using bipolar electrodes implanted 15, 25, and 35 cm distal to pylorus, and transit was studied with a radioactive marker.In the fasted state, GLP-1 (5-20 pmol kg Ϫ 1 min Ϫ 1 ), reaching physiological plasma levels, prolonged the migrating myoelectric complex (MMC) cycle length along with slowed transit.This effect was antagonized by exendin(9-39)amide.The NO synthase inhibitor N -nitro-L -arginine (L-NNA) also blocked the response to GLP-1, whereas L -arginine restored the response.Insulin (80-200 pmol kg Ϫ 1 min Ϫ 1 ) induced irregular spiking, whereas somatostatin (100-500 pmol kg Ϫ 1 min Ϫ 1 ) increased the MMC cycle length, independently of NO.In the fed state, GLP-1 (20-40 pmol kg Ϫ 1 min Ϫ 1 ) reduced motility, an inhibition unaffected by L-NNA, whereas motility was stimulated by exendin(9-39)amide.Infusion of GLP-1 (20-100 pmol kg Ϫ 1 min Ϫ 1 ) did not affect plasma insulin, but somatostatin was increased.In conclusion, GLP-1 seems to inhibit small bowel motility directly via the GLP-1 receptor.Inhibition of fasting motility is dependent of NO and not mediated via insulin or somatostatin, whereas inhibition of fed motility is independent of NO. ( J. Clin.Invest.1998.102:764-774.)Key words: gastrointestinal motility • glucagon-like peptide-1 • migrating myoelectric complex • rat • small intestine Methods 107 male Sprague-Dawley rats (B&K, Sollentuna, Sweden) weighing 300-350 g were used for the study.The experimental protocol was approved by the local Ethics committee for animal experimentation in northern Stockholm, Sweden.Preparation of rats for electromyography.53 rats were anaesthetized with pentobarbital (50 mg kg Ϫ 1 intraperitoneally; Apoteksbolaget, Umeå, Sweden) and, through a midline incision, three bipolar stainless steel electrodes (SS-5T, Clark Electromedical Instruments, Reading, UK) were implanted into the muscular wall of the small intestine 15 (J1), 25 (J2), and 35 (J3) cm distal to the pylorus.All animals were supplied with one or two jugular vein catheters for administration of drugs.The electrodes and catheters were tunneled subcutaneously to exit at the back of the animal's neck.After surgery the animals were housed singly and allowed to recover for at least 7 d before experiments were undertaken.During recovery the rats were trained to accept experimental conditions.Experiments were then carried out in conscious animals after an 8-h fasting period in wirebottomed cages with free access to water.During the experiments, the rats were placed in Bollman cages.The electrodes were connected to an EEG preamplifier (7P5B) operating a Grass Polygraph 7B (Grass Instruments, Quincy, MA).The time constant was set at 0.015 s and the low and high cut-off frequencies were set at 10 and 35 Hz, respectively.

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  • GLP-1 RAs decelerate gastric emptying to levels indicative of gastroparesis.

    “The capacity of GLP-1 RAs to decelerate gastric emptying to levels indicative of gastroparesis raises concerns regarding potential intestinal obstruction and perioperative aspiration risk.”

    From Exploring the Side Effects of GLP-1 Receptor Agonist: To Ensure Its Optimal Positioning (2025) · cites this paper as [26]

    The Discussion (page not provided) describes an inhibitory effect of GLP-1 on gastric emptying, citing a finding in healthy humans. The paper’s own experiments concern small-bowel motility in rats; it does not establish that GLP-1 receptor agonists delay gastric emptying to levels indicative of gastroparesis. (LLM, conf=0.88)

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  • GLP-1 inhibits intestinal contractions through mechanisms that may involve the central nervous system via vagal pathways or direct action on central receptors, and the enteric nervous system by modulating neurotransmission through presynaptic receptors affecting nitric oxide release.

    “GLP-1 inhibits intestinal contractions through mechanisms that may involve the central nervous system via vagal pathways or direct action on central receptors [24], as well as the enteric nervous system by modulating neurotransmission through presynaptic receptors affecting nitric oxide release [25,26].”

    From Exploring the Side Effects of GLP-1 Receptor Agonist: To Ensure Its Optimal Positioning (2025) · cites this paper as [26]

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  • Nitric oxide mediates some effects of GLP-1, including inhibition of small bowel motility in rats, protection against ethanol-induced gastric mucosal lesions, and relaxation of vascular endothelium.

    “Because nitric oxide (NO) mediates some effects of GLP-1 (e.g., inhibition of small bowel motility in rats) (48)—protection against ethanol-induced gastric mucosal lesions (20) and relaxation of vascular endothelium (31)]”

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  1. [27]27. Holst, J.J. 1991. Degradation of pancreatic peptides: glucagon. In Deg- radation of Bioactive Substances, Physiology and Pathophysiology. Uniscience volume. J.H. Henriksen, editor. CRC Press, Boca Raton, FL. 139-149.

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Authors
Tolessa, T., Gutniak, M., Holst, J. J., Efendic, S., & Hellström, P. M.
Affiliations
  • Karolinska University Hospital (SE)
  • University of Copenhagen (DK)
Corresponding author
Hellström, P M
Venue
Journal of Clinical Investigation
Published
1998-08-15
Volume
102
Issue
4
Pages
764-774
ISSN
0021-9738 (ISSN-L)
OpenAlex
W1993285386
Cited by
139
References
50
Citations by year
2026: 5 · 2025: 3 · 2024: 8 · 2023: 2 · 2022: 2 · 2021: 7 · 2019: 2 · 2018: 5 · 2017: 3 · 2016: 5 · 2015: 2 · 2014: 8 · 2013: 5 · 2012: 8
FWCI
3.52
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Funders
  • Magnus Bergvalls Stiftelse
  • Medical Research Council
Topics
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
Keywords
glucagon-like peptide-1, small intestine motility, migrating motor complex, nitric oxide, insulin, somatostatin, exendin-9-39, GLP-1 receptor, intestinal transit, L-NNA, L-arginine, gastrointestinal hormones, rat intestine
MeSH terms
Glucagon-Like Peptide-1 Receptor, Animals, Drug Interactions, Eating, Electromyography, Fasting, Gastrointestinal Motility, Gastrointestinal Transit, Glucagon, Insulin, Intestine, Small, Male, Nitric Oxide, Peptide Fragments, Protein Precursors, Somatostatin, Myoelectric Complex, Migrating, Rats, Sprague-Dawley, Receptors, Glucagon, Nitric Oxide Synthase, Nitroarginine, Rats, Glucagon-Like Peptide 1

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