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Receptor-mediated activation of gastric vagal afferents by glucagon-like peptide-1 in the rat
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2009 (English)In: Neurogastroenterology and Motility, ISSN 1350-1925, E-ISSN 1365-2982, Vol. 21, no 9, 978-e78 p.Article in journal (Refereed) Published
Abstract [en]

The vagus nerve plays a role in mediating effects of the two glucagon-like peptides GLP-1 and GLP-2 on gastrointestinal growth, functions and eating behaviour. To obtain electrophysiological and molecular evidence for the contribution of afferent pathways in chemoreception from the gastrointestinal tract, afferent mass activity in the ventral gastric branch of the vagus nerve and gene expression of GLP-1 receptors and GLP-2 receptors in the nodose ganglion were examined in Sprague–Dawley rats. Intravenous administration of GLP-1 (30–1000 pmol kg−1), reaching high physiological plasma concentrations, increased vagal afferent mass activity peaking (13–52% above basal level, < 0.05) 3–5 min after injection. Repeated administration of GLP-1 (1000 pmol kg−1; five times, 15 min intervals) elicited similar responses. Pretreatment with GLP-1 receptor antagonist exendin(9-39)amide (500 pmol kg−1) abolished the GLP-1 response to doses 30–300 pmol kg−1 but had no effect on the vagal response to gastric distension. For comparison, GLP-2 (1000 pmol kg−1) had no effect on vagal afferent activity. Vagal chemoreception of GLP-1 is supported by expression of the GLP-1 receptor gene in the nodose ganglion. However, the GLP-2 receptor was also expressed. To conclude, our results show that peripherally administered GLP-1, differently from GLP-2, activates vagal afferents, with no evidence of desensitisation. The GLP-1 effect was blocked by exendin(9-39)amide, suggesting that GLP-1 receptors on vagal afferent nerves mediate sensory input from the gastrointestinal tract or pancreas; either directly or indirectly via the release of another mediator. GLP-2 receptors appear not be functionally expressed on vagal afferents.

Place, publisher, year, edition, pages
2009. Vol. 21, no 9, 978-e78 p.
Keyword [en]
Gut hormones, Motility
National Category
Gastroenterology and Hepatology
Research subject
Medical Science
URN: urn:nbn:se:uu:diva-170769DOI: 10.1111/j.1365-2982.2009.01317.xPubMedID: 19453518OAI: oai:DiVA.org:uu-170769DiVA: diva2:509475
Available from: 2012-03-13 Created: 2012-03-13 Last updated: 2012-03-13Bibliographically approved

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Hellström, Per M.
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