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J Clin Endocrinol Metab. 2013 Apr;98(4):E664-71. doi: 10.1210/jc.2012-3855. Epub 2013 Mar 5.

Glucagon-like peptide-1 (GLP-1): effect on kidney hemodynamics and renin-angiotensin-aldosterone system in healthy men.

Author information

1
Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Norrebrogade 44, 8000 Aarhus C, Denmark. jsk@dadlnet.dk

Abstract

INTRODUCTION:

Glucagon-like peptide-1 (GLP-1) is an incretin hormone with multiple actions in addition to control of glucose homeostasis. GLP-1 is known to cause natriuresis in humans, but the effects on basic renal physiology are still partly unknown.

SUBJECTS AND METHODS:

Twelve healthy young males were examined in a randomized, controlled, double-blinded, single-day, crossover trial to evaluate the effects of 2 hours GLP-1 infusion on kidney functions. Glomerular filtration rate (GFR) and renal plasma flow (RPF) were assessed with (51)Cr-EDTA and (123)I-hippuran, respectively, using a constant infusion renal clearance technique based on timed urine sampling.

RESULTS:

GLP-1 had no significant effect on either GFR [+1.9%, 95% confidence interval (-0.8; 4.6%)] or RPF [+2.4%, 95% confidence interval (-3.6; 8.8%)]. Fractional urine excretion of lithium increased 9% (P = .013) and renal sodium clearance increased 40% (P = .007). Angiotensin II decreased 19% (P = .003), whereas renin, aldosterone, and the urinary excretion of angiotensinogen showed no significant changes. glp-1 did not affect blood pressure but induced a small transient increase in heart rate.

CONCLUSION:

The results indicate that although GLP-1 markedly reduces proximal tubule sodium reabsorption, the acute effects on GFR and RPF are very limited in healthy humans. The finding of GLP-1's ability to reduce angiotensin II concentration is novel and should be further elucidated.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT01333163.

PMID:
23463656
DOI:
10.1210/jc.2012-3855
[Indexed for MEDLINE]

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