Document Detail


Dopamine D2-like receptors and amino acid-induced glomerular hyperfiltration in humans.
MedLine Citation:
PMID:  11421998     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIMS: In rodents, blockade of dopamine D2-like receptors abolishes both the physiological increase in glomerular filtration rate (GFR) induced by amino acids and the pathological hyperfiltration in experimental diabetes mellitus. This study addressed the contribution of dopamine D2-like receptors to changes in renal haemodynamics after amino acid infusion in humans.
METHODS: Twelve healthy volunteers participated in this double-blind, randomized, cross-over study. GFR and renal blood flow (RPF) were assessed by renal clearance of inulin and p-aminohippuric acid (PAH), respectively. Following infusion of 0.45% saline at baseline, an electrolyte-balanced solution of mixed amino acids (10%) was infused. Prior to the experiments, the subjects received orally either placebo, or sulpiride (10 mg kg-1), a centrally and peripherally acting D2-like receptor antagonist, or domperidone (1 mg kg-1) which affects only peripheral D2-like receptors.
RESULTS: In the placebo series, amino acid infusion significantly increased GFR and RPF by up to 15.8 +/- 5.3% and 14.4 +/- 6.1%, respectively, while mean blood pressure and heart rate remained unchanged. Pretreatment with domperidone only marginally altered the renal response to amino acids (maximal increase by 13.2 +/- 5.6 and 11.9 +/- 4.0% in GFR and RPF, respectively), while sulpiride completely abolished the renal haemodynamic changes induced by amino acids. Total and fractional urinary sodium excretion as well as urinary osmolality were similar at baseline and increased in response to amino acids, to the same extent, in all series. No changes in renal dopamine excretion occurred.
CONCLUSION: The results indicate that in man dopamine D2-like receptors are involved in the renal haemodynamic response to amino acid infusion. Whether dopamine D2-like receptor blockade diminishes glomerular hyperfiltration in pathological states requires clinical investigations.
Authors:
G Luippold; S Schneider; A Stefanescu; P Benöhr; B Mühlbauer
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of clinical pharmacology     Volume:  51     ISSN:  0306-5251     ISO Abbreviation:  Br J Clin Pharmacol     Publication Date:  2001 May 
Date Detail:
Created Date:  2001-06-25     Completed Date:  2001-08-02     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  7503323     Medline TA:  Br J Clin Pharmacol     Country:  England    
Other Details:
Languages:  eng     Pagination:  415-21     Citation Subset:  IM    
Affiliation:
Department of Pharmacology, University of Tübingen, Centre of Clinical Pharmacology Tübingen-Stuttgart, D-72074 Tübingen, Germany. gerd.luippold@uni-tuebingen.de
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MeSH Terms
Descriptor/Qualifier:
Adult
Amino Acids / pharmacology*
Blood Pressure / drug effects
Cross-Over Studies
Domperidone / pharmacokinetics,  pharmacology
Dopamine / urine
Dopamine Antagonists / pharmacokinetics,  pharmacology*
Double-Blind Method
Drug Interactions
Female
Glomerular Filtration Rate / drug effects*
Heart Rate / drug effects
Humans
Male
Metabolic Clearance Rate
Receptors, Dopamine D2 / antagonists & inhibitors*,  metabolism
Renal Plasma Flow / drug effects
Sulpiride / pharmacokinetics,  pharmacology
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Dopamine Antagonists; 0/Receptors, Dopamine D2; 15676-16-1/Sulpiride; 57808-66-9/Domperidone
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