Extracellular Fluid Volume Expansion Uncovers a Natriuretic Action of GLP-1: A Functional GLP-1-Renal Axis in Man

Ali Asmar*, Per K. Cramon, Lene Simonsen, Meena Asmar, Charlotte M. Sorensen, Sten Madsbad, Cedric Moro, Bolette Hartmann, Boye L. Jensen, Jens J. Holst, Jens Bülow

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We have previously demonstrated that glucagon-like peptide-1 (GLP-1) does not affect renal hemodynamics or function under baseline conditions in healthy participants and in patients with type 2 diabetesmellitus. However, it is possible that GLP-1 promotes natriuresis under conditions with addition of salt and water to the extracellular fluid. The current study was designed to investigate a possible GLP-1-renal axis, inducing natriuresis in healthy, volume-loaded participants. Methods: Under fixed sodium intake, eight healthy men were examined twice in random order during a 3-hour infusion of either GLP-1 (1.5 pmol/kg/min) or vehicle together with an intravenous infusion of 0.9% NaCl. Timed urine collections were conducted throughout the experiments. Renal plasma flow (RPF), glomerular filtration rate (GFR), and uptake and release of hormones and ions were measured via Fick's principle. Results: During GLP-1 infusion, urinary sodium and osmolar excretions increased significantly compared with vehicle. Plasma renin levels decreased similarly on both days, whereas angiotensin II (ANG II) levels decreased significantly only during GLP-1 infusion. RPF and GFR remained unchanged on both days.

Original languageEnglish
JournalJournal of Clinical Endocrinology and Metabolism
Volume104
Issue number7
Pages (from-to)2509-2519
ISSN0021-972X
DOIs
Publication statusPublished - Jul 2019

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